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参考:

　　百度文库---蠕虫的行为特征描述和工作原理分析

http://wenku.baidu.com/link?url=ygP1SaVE4t4-5fi7wmF07GoWBaT6qDX2J3IH-tih6C2Lk4lIYcB-fEEa5LQgRP469JJrIZVoC1cg7QkNyvmU7tMX8qApii0GXrQ_Ocf7jne