------ malicious code acquaintance of network worms

Internet worm that is characteristic of malicious programs spread through the network or system vulnerabilities, a large part of the network worm has to send out infected e-mail, blocking the network features.
Several well-known worms :

Worm Name	The use of specific vulnerabilities	Time outbreak
Slammer	MS02-039	2003.1.25
Blaster	MS03-026	2003.7.11
Sasser	MS04-011	2004.1.01
Zotob	MS05-039	2005.1.14

Viruses and worms difference:

   网络蠕虫可以独立运行，并能把自身的一个包含所有功能的版本传播到另外的计算机上。
   通常可以粗略的把蠕虫程序代码或代码的功能分为基本功能模块和扩展功能模块。
   基本功能模块：目标搜索或生成模块  ***模块  传输模块  
   扩展功能模块：主机驻留模块化  隐藏模块  破坏模块 通信模块 控制模块