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https://github.com/vxunderground/MalwareSourceCode
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115 lines
2.8 KiB
NASM
115 lines
2.8 KiB
NASM
; Boot Record Program (C) Copyright Peter Norton 1986
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boots segment 'code'
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public boot
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assume cs:boots
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boot proc far
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; 30-byte DOS info -- set up for 1-side, 8-sector
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; change as needed for any other format
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head:
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jmp begin ; EB 2A 90 as per normal
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db ' Norton ' ; 8-byte system id
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dw 512 ; sector size in bytes
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db 1 ; sectors per cluster
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dw 1 ; reserved clusters
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db 2 ; number of fats
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dw 64 ; root directory entries
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dw 320 ; total sectors
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db 0FEh ; format id
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dw 1 ; sectors per fat
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dw 8 ; sectors per track
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dw 1 ; sides
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dw 0 ; special hidden sectors
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; mysterious but apparently standard 14-byte filler
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db 14 dup (0)
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; carry on with the boot work
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begin:
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mov ax,07C0h ; boot record location
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push ax
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pop ds
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mov bx,message_offset ; put offset to message into si
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mov cx,message_length ; message length from cx
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continue:
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mov ah,14 ; write teletype
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mov al,[bx]
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push ds
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push cx
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push bx
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int 10h
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pop bx
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pop cx
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pop ds
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inc bx
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loop continue
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mov ah,0 ; read next keyboard character
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int 16h
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mov ah,15 ; get video mode
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int 10h
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mov ah,0 ; set video mode (clears screen)
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int 10h
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int 19h ; re-boot
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beg_message:
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db 0Dh,0Ah ; carriage return, line-feed
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db 0Dh,0Ah
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db 0Dh,0Ah
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db 0Dh,0Ah
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db ' Start your computer with'
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db 0Dh,0Ah
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db ' a DOS system diskette.'
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db 0Dh,0Ah
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db 0Dh,0Ah
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db 0Dh,0Ah
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db ' This is'
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db 0Dh,0Ah
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db ' The Norton Utilities'
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db 0Dh,0Ah
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db ' Version 3.0'
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db 0Dh,0Ah
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db ' from'
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db 0Dh,0Ah
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db ' Peter Norton'
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db 0Dh,0Ah
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db ' 2210 Wilshire Blvd'
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db 0Dh,0Ah
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db ' Santa Monica, CA 90403'
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db 0Dh,0Ah
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db 0Dh,0Ah
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db ' (213) 826-8092'
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db 0Dh,0Ah
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db 0Dh,0Ah
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db 0Dh,0Ah
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db 0Dh,0Ah
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db ' Insert a DOS diskette'
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db 0Dh,0Ah
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db ' Press any key to start DOS ... '
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end_message:
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; I put a copyright notice here; you do if you want to ...
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tail:
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message_offset equ beg_message - head
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message_length equ end_message - beg_message
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filler_amount equ 512 - (tail - head) - 2
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db filler_amount dup (0) ; filler
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db 055h,0AAh ; boot id
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boot endp
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boots ends
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end
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