"The online-advertising industry is scrambling to quell a long-standing problem that has taken a turn for the worse: the spread of malicious ads on the Internet's top commercial websites.
Several new twists have made so-called malvertisements a fast-rising threat to consumers — and a big headache for publishers, advertisers and ad networks, say technologists and security researchers.
The spread of infected online ads has spiked tenfold over the past year, according to research disclosed by security intelligence firm RiskIQ at a recent Online Trust Alliance conference in Washington, D.C.
RiskIQ documented a peak of 14,694 occurences of malvertisements in May of this year, up from 1,533 in May 2010. Each corrupted ad could have infected the PCs of thousands or millions of website visitors, based on how long the ad ran, says Elias Manousos, CEO of RiskIQ."
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