New Bagle variants spreading

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May 31, 2005 (IDG News Service) -- At least three new versions of the Bagle e-mail worm were spreading quickly on the Internet today, according to several Internet security firms.
MessageLabs Ltd., which monitors 110 million pieces of e-mail sent per day, found about 145,000 copies of just one of the new Bagle downloader variants, said Maksym Schipka, a senior antivirus researcher at the company. MessageLabs tracked about 4,000 copies of the variant between 7 a.m. and 8 a.m. EDT. That number jumped to nearly 42,000 copies in the next hour and rose to 56,000 copies between 9 a.m. and 10 a.m., the company reported.
About 80 variants of the original Bagle worm, which first appeared in January 2004, have been released on the Internet. The first Bagle downloader variant MessageLabs tracked today drops a Trojan horse program that attempts to download Bagle from a list of about 130 Web sites worldwide. Computer users who activate the file attached in the e-mail activate the virus, which harvests e-mail addresses it finds on the computer's hard drive. The virus then forwards itself onto the list of e-mail addresses found on the infected computer.
In the first variant, the e-mail carrying the Bagle worm had an empty subject line and body text, MessageLabs said.
The variant appeared to start on a Yahoo Inc. Web mail account, Schipka said. "Somebody wanted to refresh his botnets or e-mail addresses," Schipka said. "They want to keep up to date with the things they sell." Botnets are groups of compromised computers that are controlled by hackers and often used in cyberattacks.
Antivirus vendor Symantec Corp. also reported seeing at least one new Bagle variant but found the worm to be spreading slower than MessageLabs reported. Symantec found only about 50 Bagle copies on computers with its virus-protection software installed, said Alfred Huger, senior director of engineering at Symantec Security Response.
Huger said he expected little damage from this Bagle attack.
Damage from the new Bagle variants should be minor as antivirus vendors react quickly to the attacks, said Ken Dunham, director of malicious code at iDefense Inc., another cybersecurity vendor. The first two variants seen today were tentatively dubbed Bagle.CA and Bagle.CB, which would make them the 79th and 80th Bagle variants.
"We're a long way down the line of Bagle worms," Dunham said. "It's very similar to former Bagle attacks."
Dunham encouraged computer users to update their antivirus software, use firewalls and avoid opening suspicious files attached to e-mail. "Just because it looks like it was from your billing department, or it was from your friend, or it was porno doesn't mean it is," he said. "Be careful on e-mail -- don'ttrust anything."

Reprinted with permission from

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