Spoofed LinkedIn Messages Serving BlackHole Exploit

Monday, March 19, 2012

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Users of the business-related social network LinkedIn have reported receiving email notifications that are tainted with a malicious link intended to infect the targeted recipient's computer.

The operation was identified by researchers at security provider GFI Labs, and documented on the company's blog.

"Be advised that there are fake Linkedin invitation reminders in circulation sending users to a BlackHole exploit which attempts to drop Cridex onto the PC," writes GFI's Chris Boyd.

The Cridex malware is commonly utilized in spam-based attack operations, and the use of messages designed to look like LinkedIn notifications potentially makes this particular attack all the more effective, as users are accustomed to receiving numerous communications from the platform daily.

"Cridex is a rather nasty piece of work that does everything from target banks and social networking accounts to a little bit of CAPTCHA cracking," Boyd said.

GFI Labs provided a sample of one of the malicious notifications:

(click image to enlarge)

GFI-LinkedIn

 

GFI recommends that LinkedIn users not engage such notifications directly from their email, but instead should confirm the message's authenticity by seeing if the message appears in their LinkedIn account inbox.

"This particular run shares the IP address 41(dot)64(dot)21(dot)71 with various BBB and Intuit spam runs from recent weeks. If in doubt, go directly to LinkedIn and check your invites from there," Boyd continued.

Source:  http://www.gfi.com/blog/fake-linkedin-mails-lead-to-cridex/

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