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    Google Stomps Out Malicious Sponsored Links

    By
    Lisa Vaas
    -
    April 30, 2007
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      Google has shuttered AdWord accounts that have been serving up malware while masquerading as known and trusted sites, such as Better Business Bureau and cars.com.

      One of the malicious sponsored AdWord sites, BBB.org, was showing up as the top sponsored result as of April 23 when Exploit Prevention Labs Googled the word “BetterBusinessBureau.” (For a screenshot, click here.)

      A user who clicked on the sponsored link would have noticed nothing unusual—merely a slight lag until he or she was brought to the legitimate Better Business Bureaus site. But in the background, the exploit installed a backdoor and a post-logger—which is a much more powerful version of a keylogger that captures an entire screen and makes it easy for the attacker to figure out which keystrokes belong to the password, which belong to the user name, what the secret question is and what the secret answer is.

      Exploit Prevention Labs‘ community intelligence network has been reporting the exploits since April 10. Today it posted a video clip recording the exploit in real time. The security firm, which markets a link-scanning product, traced the bogus sites to the Russian malware-hosting site SmartTrack.org.

      Exploit Prevention Labs reported that it detected 20 distinct search strings that resulted in links to smarttrack.org, and as of now it isn’t clear if Google has managed to clean up all of the links. The EP Labs’ Roger Thompson said that the post-logger was targeting about 100 banks from around the world by injecting “extra” html into the banks’ response pages as an attempt to coax extra information out of its victims.

      Thompson said that the post-logger is a browser-helper object, and thus part of the end point of any SSL transaction. That means it can see everything in plain text, instead of encrypted, he said.

      A search engine pointed to a malware drive-by site isn’t anything new, but this exploit is particularly dangerous in that mousing-over the sponsored result displays no URL preview. “This means that a user has no clue where she is about to navigate to,” he said. “Savvy search engine users will know that often these sponsored links will take you through a ‘Click-manager’ or other advertising service and so seeing your browser pass through smarttrack.org will appear benign enough.”

      Lisa Vaas
      Lisa Vaas is News Editor/Operations for eWEEK.com and also serves as editor of the Database topic center. Since 1995, she has also been a Webcast news show anchorperson and a reporter covering the IT industry. She has focused on customer relationship management technology, IT salaries and careers, effects of the H1-B visa on the technology workforce, wireless technology, security, and, most recently, databases and the technologies that touch upon them. Her articles have appeared in eWEEK's print edition, on eWEEK.com, and in the startup IT magazine PC Connection. Prior to becoming a journalist, Vaas experienced an array of eye-opening careers, including driving a cab in Boston, photographing cranky babies in shopping malls, selling cameras, typography and computer training. She stopped a hair short of finishing an M.A. in English at the University of Massachusetts in Boston. She earned a B.S. in Communications from Emerson College. She runs two open-mic reading series in Boston and currently keeps bees in her home in Mashpee, Mass.

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