This script behaves like a virus

This script shows you how a script can be self modifying, like viruses.

It is a warning about the possibilities of macro viruses.

File Name : selfmodify.vbs

Requirement : none

Author : Jean-Luc Antoine

Submitted : 01/09/2001

Category : Other

代码如下:

Const n = 1

Dim f, a, s, w

w = WScript.ScriptFullName

Set f = CreateObject("Scripting.FileSystemObject")

Set a = f.OpenTextFile(w, 1)

a.SkipLine

s = chr(13) & Chr(10) & a.ReadAll

a.Close

Set a = f.CreateTextFile(w, True)

a.Write "Const n = " & n + 1 & s

a.Close

WScript.echo "This script has been run " & n & " times"

原理就是每次运行脚本自身的代码就会被修改Const n = 1，这个1是一直变化的。

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