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Twitter spam bearing a worm virus is on the loose today trying to lure Twitter users into opening a malicious file attachment containing malware that could take over Windows-based machines, Symantec is warning. It works through a Twitter message that arrives claiming your friends are inviting you to join them and to check the attachment -- which is a ZIP file -- to find out who, says Kevin Haley, director of Symantec's security response division. "It's a new social-engineering trick," he says, adding the payload is Ackantta.B, a variant on the Ackantta worm discovered in February that has been used in e-mail spam attacks.