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Major Ad Networks Found Serving Malicious Ads

Dec 13, 2010, 22:35 (0 Talkback[s])
(Other stories by Dennis Fisher)

"Two major online ad networks--DoubleClick and MSN--were serving malware via drive-by download exploits over the last week, experts say, after a group of attackers was able to trick the networks into displaying their ads by impersonating an online advertising provider.

"The scheme involved a group of attackers who registered a domain that was one letter away from that of, an online advertising technology firm. The attackers then used the fake dupe the advertising networks into serving their malicious banner ads. The ads used various exploits to install malware on victims' PCs through drive-by downloads, according to information compiled by security vendor Armorize.

"The ad networks only served the malicious content for a short period of time, but the episode shows just how difficult the drive-by download problem can be to address."

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