<h1>The 10 most damaging botnets in the U.S.</h1>

America's 10 most wanted botnets ranked by size and strength

By Ellen Messmer, Network World

Botnet attacks are increasing, as cybercrime gangs use compromised computers to send spam, steal personal data, perpetrate click fraud and clobber Web sites in denial-of-service attacks. Here's a list of America's 10 most wanted botnets, based on an estimate by security firm Damballa of botnet size and activity in the United States.


No. 1: Zeus


3.6 million compromised U.S. computers. The Zeus Trojan uses key-logging techniques to steal sensitive data such as user names, passwords, account numbers and credit card numbers. It injects fake HTML forms into online banking login pages to steal user data.

No. 2: Koobface


2.9 million compromised U.S. computers. This malware spreads via social networking sites MySpace and Facebook with faked messages or comments from "friends." When a user is enticed into clicking on a provided link to view a video, the user is prompted to obtain a necessary update, like a codec -- but it's really malware that can take control over the computer.

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~Sandy G.