The FBI is actively investigating the two most recent - and most damaging - worms and viruses, the agency says, and is "confident" it will bring those responsible to justice.

MSBlast, also called W32/Blaster, the worm that bogged down enterprise networks and had them racing to plug a vulnerability in Microsoft Windows, first struck on August 11. A week and a day later, Sobig.F, a virus tucked inside an attachment to an e-mail message, flooded corporate and consumer inboxes with millions of spam-like messages. Together, the pair accounted for the year's most troublesome month for security professionals, enterprise IT managers, and at-home users.

“We are working with the Department of Homeland Security and with state and local law enforcement on our Cyber Task Forces to track down the perpetrators of Sobig and the recent W32/Blaster worm,” said Robert Mueller, the bureau's Director.

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• Article: MS Blaster Worm Roundup (12 August 2003)