Trojan Poses As Plug And Play Patch - InformationWeek
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8/26/2005
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Trojan Poses As Plug And Play Patch

A Trojan horse not connected to the Zotob blitz on vulnerable Windows 2000 PCs appears to be taking advantage of the scare by posing as a patch against the Microsoft bug.

A Trojan horse not connected to last week's Zotob blitz on vulnerable Windows 2000 PCs is nevertheless taking advantage of the scare, security researchers said Friday, by posing as a patch against the Microsoft bug.

A new variant of the Downloader Trojan presents itself as a patch for the vulnerability outlined in the MS05-039 bulletin Microsoft released earlier in August. That vulnerability was used by Zotob just days later to attack Windows 2000 machines, and may be used in the near future to break into some Windows XP systems.

"This is a new way of exploiting the Plug and Play vulnerability, in this case by making use of social engineering, a strategy already used to trigger significant epidemics in the past as it aims to trick users into running the file received," said Luis Corrons, the director of anti-virus vendor Panda Software's research arm, in a statement.

Like other bogus patch messages, the one bearing the Downloader.ejd Trojan spoofs the sending address -- in its case, "update@microsoft.com" -- and uses the subject heading of "What You Need to Know About the Zotob.a Worm" to trick users into opening the file attachment.

That attached file is named "MS05-039.exe," which matches the Microsoft security bulletin, and so gives some credence that it may be legitimate.

If Downloader.ejd is installed, it tries to disable security applications, then downloads a file called "test.exe" which in turn contains another Trojan, "Agent.aii," that adds a keylogger to the PC. The keylogger tries to steal information sent through Web sites that include terms such as "pay," "e-gold" and "goldmoney."

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