The Sdbot and Gaobot families are responsible for most botnets worldwide. These two families were responsible for 80 percent of detections related to bots during the first quarter of 2007. Other culprits, although on a much lesser scale, included Oscarbot, IRCbot or RXbot.

Bots are automated worms or Trojans that install themselves on computers to carry out certain actions automatically, such as sending spam, and turning the compromised computers into

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