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America's 10 most wanted botnets

(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. Ranked by size and strength, these article presents the 10 most damaging botnets in the U.S.

1. Zeus
Compromised U.S. computers: 3.6 million. Main crime use: The Zeus Trojan uses key-logging techniques to steal sensitive data such as user names, passwords, account numbers and credit card numbers.
2. Koobface
Compromised U.S. computers: 2.9 million. Main crime use: This malware spreads via social networking sites with faked messages or comments from "friends."
3. TidServ
Compromised U.S. computers: 1.5 million. Main crime use: This downloader Trojan spreads through spam e-mail, arriving as an attachment.[...]

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