by Fraser Howard

As we all know, compromised sites play an important role in web distributed malware, acting as the conduit, guiding user traffic to further malicious content. Sometimes, the attackers get lucky, and succeed in compromising a high profile, popular site. Another way to increase the number of users exposed to the attack is to compromise advertising content, thereby exposing all users of any 3rd party sites that happen to load the ads.

Late yesterday evening, we started to see evidence of such an attack - Sophos products were blocking certain ad content as Mal/Iframe-U.

Spotted here