"Storm Worm," one of the larger Trojan horse attacks in recent years, is baiting people with timely information about a deadly, real-life storm front, security researchers said Friday.
Over an eight-hour period Thursday, malicious e-mails were sent across the globe to hundreds of thousands of people, said Mikko Hypponen, chief research officer for F-Secure.
People who open the attachment then unknowingly become part of a botnet.