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November 24, 2005
Sober Is Biggest Worm Attack Of The Year
The Sober worm outbreak that began in earnest Tuesday has been dubbed the world’s largest mass-mailed malware attack of 2005 by a Finnish security firm.
"The numbers we’re seeing are just huge. This is the largest e-mail worm outbreak of the year so far," wrote Miko Hyppönen, chief research officer of F-Secure, in an online alert.
Meanwhile, Denver-based MX Logic said that Sober was accounting for one in every eight e-mails.
The newest member of the Sober worm clan - called Sober.x, Sober.y, and Sober.z by various anti-virus vendors - began spreading Monday and quickly picked up steam Tuesday. Analysts pinned its success on social engineering expertise, technical skill, or a combination of the two.
Many of the messages arrive with fake From: addresses of the FBI, CIA, and overseas police agencies such as Germany’s Bundeskriminalamt, for example, to trick users into opening the attachment. Others pose as video clips of pseudo-celebrities such as Paris Hilton and Nicole Richie.
Like other Sober variants, this one spreads using its own SMTP engine to send copies of itself to addresses it hijacks from compromised computers. SMTP use port 25 to transmit its e-mail traffic.
One security firm, the U.K.-based Sophos, has tagged the new Sober with its highest-possible threat label, while others, including Symantec and McAfee, have dubbed it a "medium" threat.
Symantec issued an additional warning to customers of its DeepSight Threat Management System to warn them of a large spike in incoming malicious attachments due to the widespread Sober. The alert also recommended that enterprise administrators take action.
As for the rationale behind the biggest attack of the year, analysts are in agreement: it’s an attempt by criminals to acquire compromised computers that can be "rented" out to spammers or other hackers.
Source: TechWeb News
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