'Storm Trojan' ignites worm war

The Trojan horse that pumped up spam volumes in January is at it again, researchers said today, and is now spreading over instant messaging and engaging in attacks on rival malware. The "Storm Trojan," aka "Peacomm," is now spreading via AOL Instant Messenger (AIM), Google Talk and Yahoo Messenger.

Moreover, the server from which the malware is downloaded to the victim's PC can be quickly changed by the attacker using the Trojan's peer-to-peer (P2P) control channel. The Trojan has been behind several recent distributed denial-of-service (DDoS) attacks against antispam Web sites, as well as servers supporting rival malware.

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