Miscreants are hijacking and linking thousands of compromised computers, called botnets, to launch coordinated attacks. Large enterprises may have hundreds of compromised hosts being used by a single attacker. And numerous attackers are likely using multiple sets of computers. Defending against botnet attacks is challenging and complex. Here are five practical steps for identifying and ridding your network of bot infection.
Bots (short for "robot") are programs that listen and respond to commands on Internet Relay Chat (IRC) channels. A group of bots acting in concert forms a botnet. Bots can be found running on any OS, although they are more commonly found on computers running Windows.
Five steps for beating back bots
1. Scan hosts and network traffic for the telltale signs of bot infection.
2. Tune routers, firewalls and intrusion-detection/prevention systems to detect and block botnet traffic.
3. Secure hosts against botnet exploit.
4. Apply reverse engineering to bot code.
5. Work with law enforcement to help prosecute botnet creators.
Click here for full details on how to perform each of the above five steps.
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This was first published in June 2005