Known as the fastest-spreading virus in Internet history, with a mere 12.8 million hits recorded in August alone, the virus is alive and well two months after its self-imposed shutdown or termination date.
MessageLabs put out a warning Monday that SoBig is still out to destroy, and while it is considerably less virulent than earlier this year, it was considered the third most active virus in the month of November and chalked up 264,000 attacks detected by email virus scanners.
SoBig made its debut in January 2003 as the first member of the virus' family. Five SoBig variants later, the SoBig.F variant appeared in August of this year and at its peak was found in 1 out of every 17 emails worldwide.
According to MessageLabs, the SoBig.F variant was "the most sophisticated and prolific to date."
MessageLabs first detected the Sobig.F virus on Aug. 18 after snagging more than one million copies within the first 24 hours on behalf of its customers. Between Aug. 18 and the end of the month, MessageLabs claims to have intercepted a record 12.8 million emails containing the virus.
Security experts agree that the very process through which the virus was designed to propagate might have also been its reason for a longer-than-average life span.
According to CNET, the virus is still in existence partly because many PCs are set to the wrong date. Another reason is wedded to the very nature of the virus, which goes through a process after being successfully downloaded onto a computer system to link to other servers and continue the spread of the virus.
But in some cases those downloads may have failed because servers were taken offline, hence the virus is still out there trying to do what it was written to do: wreak havoc. Ironically, its life has become prolonged because of widespread efforts to stop it.
"Some experts believe this downloaded code could have precipitated a massive denial-of-service attack, but this was foiled because the compromised servers were taken offline in time," stated CNET's Graeme Wearden.
"Because of the built-in shutoff mechanism, a PC receiving a copy of SoBig today should not try to forward it on," CNET continued. "But another factor behind SoBig's longevity could be that some PCs are set to the incorrect date. While networked PCs will typically take their date and time from a central server, home PCs are reliant on their internal clock and the small battery that powers it."
According to MessageLabs, when a battery runs down and isn't replaced, a computer will not know the correct date or time. Many PCs out there that are connected to the Internet haven't switched their virus activity off and because of that they continue to help spawn SoBig.F.
"SoBig.F may have failed in its ultimate business objective, to create a network of spam sending machines, but the people behind these combined threats are using lessons learned from each attack to perfect their strategies," said Mark Sunner, chief techonlogy officer for MessageLabs. "Attacks will continue until they prove successful. There are hundreds of virus writers and spammers operating beyond the law and perhaps out of reach of the law, but fortunately it is not out of the reach of businesses to stop these attacks."
And while SoBig.F continues to propogate, so does a $250,00 bounty on the virus writer's head, as pledged by Microsoft chief Bill Gates in November as part of a joint effort with the FBI and various government agencies active in the fight against computer viruses. So far, the computer giant has not announced any progress in its hunt for the viruses maker. The maker of the MSBlaster worm is also being hunted down by task forces and is part of an overall $5 million pledge by Gates to find and convict virus writers.