The Change Mariner

Worm turns PCs into spam machines

CNN Money

Several Internet worms that have besieged computers for over a week played havoc again on Wednesday, including one called Sobig.F whose aim was to turn PCs into spam machines and was believed to be the fastest growing virus ever, experts said.

Sobig.F drops software onto infected Windows computers that open them to be used later for distributing Internet spam -- unwanted e-mails and product promotions, experts said. It also represents a new trend in converging e-mail spamming and virus software writing, they said.

"We believe (Sobig.F) has been written by a spammer or spammers" looking for ways to get past spam filters, said Mikko Hypponen, manager of anti-virus research for Finnish security firm F-Secure. "For once, we have a clear motive for a virus -- money."