FBI director Robert Mueller said in a statement: 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.

He added: We employ the latest technology and code analysis to direct us to potential sources, and I am confident that we will find the culprits.

As we reported Monday, the FBI last week subpoenaed web server log records from Easynews.com, a small Arizona-based provider of Usenet new feeds. It is believed SoBig.F was seeded to six adult newsgroups a week ago.

Source: Computerwire