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https://github.com/vxunderground/MalwareSourceCode
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94 lines
2.4 KiB
NASM
94 lines
2.4 KiB
NASM
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; Phantasie Mutation Engine --- DEMO
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; This program will generate 50 mutation programs.
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; (C) Copyright 1995 Written by Burglar. All Rights Reserved.
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; Made In Taiwan.
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.MODEL TINY
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.CODE
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ORG 100H
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EXTRN PME:NEAR, PME_END:NEAR ;must declare PME to external module.
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BEGIN:
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MOV DX,OFFSET GEN_MSG
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MOV AH,9
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INT 21H
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MOV CX,50
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GEN:
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PUSH CX
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MOV DX,OFFSET FILENAME
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PUSH CS
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POP DS
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XOR CX,CX
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MOV AH,3CH
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INT 21H
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PUSH AX
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MOV DX,OFFSET PROG ;DS:DX point to the head of program which you
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;want to be mutation.
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MOV CX,OFFSET PROG_END - OFFSET PROG ;CX hold the length of the
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;program which you want to
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;be mutation.
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MOV BX,100H ;BX sets the beginning offset when execution.
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PUSH SS
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POP AX
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ADD AX,1000H
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MOV ES,AX ;ES point to a work segment.
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;for putting decryption routine + encrypted code.
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;just need the length of origin program + 512 bytes.
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CALL PME ;OK! when every thing is okay, you can call the PME.
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;When PME execute over, it will return :
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;DS:DX -> decryption routine + encrypted code.
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;CX -> length of the decryption routine + encrypted
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;code. (always origin length + 512 bytes)
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POP BX
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MOV AH,40H
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INT 21H
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MOV AH,3EH
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INT 21H
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MOV BX,OFFSET FILENAME
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INC BYTE PTR CS:BX+7
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CMP BYTE PTR CS:BX+7,'9'
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JBE L0
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MOV BYTE PTR CS:BX+7,'0'
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INC BYTE PTR CS:BX+6
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L0:
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POP CX
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LOOP GEN
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INT 20H
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FILENAME DB '00000000.COM',0
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GEN_MSG DB 'Generating 50 mutation programs... $'
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PROG:
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CALL $+3
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POP DX
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ADD DX,OFFSET MSG - OFFSET PROG - 3
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MOV AH,9
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INT 21H
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INT 20H
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MSG DB 'I am a mutation program.$'
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PROG_END:
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END BEGIN
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