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Yahoo ads were infected with malware for nearly a week before anyone noticed

August 04, 2015
Aaron Polmeer

By Jordan Valinsky

For nearly a week, nobody from Yahoo noticed that its banner ads were inflicting people’s computers with malware. The New York Times reports that hackers infiltrated banner ads on Yahoo’s ad network using an Adobe Flash vulnerability beginning on July 28 until yesterday.

Reachers from security firm Malwarebytes said that the hackers bought ads on Yahoo’s family of highly trafficked websites, like news and sports, and targeted Windows users using older versions of Adobe Flash. Then, a malicious malware code was automatically downloaded to their desktops that was used to remotely control the computer, like locking people out until they paid the hackers.

More frighteningly, the code didn’t require users to even interact with the ad, rather they could get infected was by simply browsing the page. It’s unclear how many people were affected. It’s extremely embarrassing for Yahoo, whose homepage garners 6.9 billion views each month with its subset of news, entertainment and sports verticals collecting hundreds of millions of visits.

After Malwarebytes alerted Yahoo, the company fixed the issue.

“Unfortunately, disruptive ad behavior affects the entire tech industry,” it said in a statement to the blog. “Yahoo has a long history of engagement on this issue and is committed to working with our peers to create a secure advertising experience.”

The recently-discovered vulnerability only adds to the chorus of calls telling tech companies to dump Flash because of its weak security protocols. Firefox said last month it will block Flash from its browsers.

“Right now, the bad guys are really enjoying this,” Jérôme Segura, a security analyst from Malwarebytes told the Times. “Flash for them was a godsend.”

Perhaps native ads really are the wave of the future.

The post Yahoo ads were infected with malware for nearly a week before anyone noticed appeared first on Digiday.

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