Doubleclick isn't exactly your eastern europe shaddy site :
You are probably not responsible and involved, and thank you for the informative post, I am sorry but your "we are vetting ad" in view of big network serving malware, sounds more like trying to stem the flow of the blood while pretending one is not wounded.
"The only real market solution is to whitelist a certain number of ad networks"
No the real only solution is to blacklist *all* ad network until they accept responsibility and utterly disable any scripting in their advertising, only serving sanitized text and sanitized image. And that is the minimum.