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Quote:A Yahoo-owned advertising network became the unwitting ally of cyber crooks after it spewed millions of Trojan-laced banner ads on MySpace, PhotoBucket and other websites.

The banner ads, which were brokered by Right Media, were served an estimated 12 million times over a three-week period starting in early August...

The banners contained a Flash file that silently installed a Trojan back door on unpatched Windows machines that visited the popular web destinations. Using an unpatched version of Internet Explorer while visiting MySpace or PhotoBucket was all that was necessary to become infected. The ads also ran on TheSun.co.uk, Bebo.com and UltimateGuitar.com...

Quote:The worst-case scenario used to be that online ads are pesky, memory-draining distractions. But a new batch of banner ads is much more sinister: They hijack personal computers and bully users until they agree to buy antivirus software.

And the ads do their dirty work even if you don't click on them.

The malware-spiked ads have been spotted on various legitimate websites, ranging from the British magazine The Economist to baseball's MLB.com to the Canada.com news portal. Hackers are using deceptive practices and tricky Flash programming to get their ads onto legitimate sites by way of DoubleClick's DART program...

If you've seen any of the ads, you may have experienced something like this: You're on a legitimate site. Your browser window closes down. A new browser window comes up, redirecting you to an antivirus site, while a dialog box comes up telling you that your computer is infected and that your hard drive is being scanned. The malware tries to download software to your computer and scans your hard drive again...