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Windows 7: Fake Microsoft Office tool hides worm

17 Nov 2011   #1

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Windows 7 Home Premium x64 SP1
Fake Microsoft Office tool hides worm

Disguised as an out-of-date authentication system, the worm could disable firewalls

If you use Microsoft Office, a sneaky and harmful worm may be out to infect your system.

The security firm Bitdefender found a worm, identified as Win32.Worm.Coidung.B, that disguises itself as Office Genuine Advantage (OGA), a program Microsoft deployed in the past to validate customers' copies of Office and let them download files and updates from the Microsoft website. Microsoft retired OGA in December 2010, but that hasn't stopped the attackers from using it to ensnare victims a year later.

The fraudulent OGA program, labeled "office_genuine.exe," is spreading via Yahoo Messenger, and once the attachment is downloaded, it opens a portal in people's computers for another infected file, Win32.Virtob, to do its damage.

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 Fake Microsoft Office tool hides worm

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