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