http://story.news.yahoo.com/news?tmp...20&u=/nf/23458
The passel of new worms sport a virtual alphabet soup of labels: "Bagle.q," "Bagle.r," "Bagle.s" and "Bagle.t." Some security firms have dubbed the new variants "beagle." They are mutations of the original Bagle worm first discovered in January
Bagle exploits a flaw in Outlook, revealed in October of 2003, that allows a hacker to upload and execute a file on a user's PC without that user opening the file. Microsoft (Nasdaq: MSFT - news) has issued a patch for the flaw in October, but users who have not updated their systems with this patch are at risk.
"This steps up the game," Sophos security analyst Chris Belthoff told NewsFactor. "The education part of protecting against viruses -- 'Don't click open attachments' -- got thrown out the window with these variants."