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Apparently the NBC site has been attacked and some malcious code has been placed on their web page.
More information can be found here:
There is a malicious iframe that is being used as the attack vector. The URLs that I found on the site (within the iframe) were categorized by trustedsource by the time I got to them.
I was however able to create a rule in MWG to remove iframes for sites in a given list, see screenshot below. Please keep in mind using the HTML opener can be a performance hit. This rule may need to be refined for production use and may produce false positives:
Just thought I'd share in case someone else read the news.