Top-tier news sites, entertainment portals, and political commentary sites were among the victims of a massive malvertising campaign related to the Angler Exploit Kit. This campaign is targeting users in the United States and may have affected tens of thousands of users in the last 24 hours alone. Based on our monitoring, the malicious ads were delivered by a compromised ad network in these highly-visited mainstream websites. As of this writing, while the more popular portals appear to be no longer carrying the bad ad, the malvertising campaign is still ongoing and thus continues to put users at risk of downloading malware into their systems.