Thanks for reporting the recent popup and warnings.  Rush was on this the moment I forwarded your reports.  Doesn’t look like it came from any of the ad banners.  This seems to be internal.  We are taking measures to prevent it.  However, I need your help in detecting when it happens to take immediate action.  If I need to disable Blizzplanet while it’s investigated, it may help loads.

Just take a screenshot or write down the URL or ad banner (if it ever happened). With that info we can square it down faster, instead of guessing.  So far it seems the issue has been resolved. It doesn’t show up on my end anymore.

Install or keep Avast, or other anti-virus updated at all times.