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Back in 2003, security firms saw thousands of PCs infected with the Sobig mass-mailing virus. Later that year, Fizzer malware logged thousands of computers into internet chat rooms.
This was initially perceived only as a problem for IRC (Internet Relay Chat) admins. However, the infected PCs were connected to chat rooms by their human bot-masters, waiting for command and control (C&C) instructions. When MessageLabs Intelligence correlated the malware and spam traffic from each spam sending IP address, the bigger picture was revealed.
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