The Bibrog-B e-mail worm disguises itself as a shooting game to lure the unwary. According to the article, " While the shooting game is running, the worm is copying itself across the user's hard drive and preparing to forward itself to all contacts in the Outlook address book, or via file-sharing networks. In a particularly devious twist the worm makes changes to an infected user's Internet browser so that it can display fake versions of genuine Web sites such as Hotmail, Citibank, MSN and Yahoo. Security firms believe this is an attempt to steal usernames and passwords." More information is available here.