Mactroubleshoot.com

Has anyone seen a "virus found" popup when gaming online, from 'mactroubleshoot.com'?  This poped up when my son was using Safari playing a game.  The window had no buttons accept the 'scan now' button, which then led to http://mackeeperapp.mackeeper.com/landings/download-...

I cannot find any information about these on the internet, except mackeeper which has a website, but still would like to see a recognized organization comment on it.  

Thanks!