The Storm worm that wreaked havoc in January has opened up a new front in its war against users—instant messaging. The Trojan virus that was responsible for countless spam e-mails sent around the globe has spawned a new variant that is using AOL Instant Messenger, Google Talk and Yahoo Messenger to proliferate. The worm attacks by detecting when someone is chatting and sending out a message with a link to the first stage of malware on a site. If the user clicks the link, the first stage will execute.