ZeroAccess is currently the fastest-growing botnet. Over the past few months, ZeroAccess has grown from 1 million to more than 2 million super nodes globally. Its primary function is ad-click fraud. Victim computers receive instructions from a controller directing them to click on ads on specific websites. The website owner gets paid by the advertiser on a per-click basis, usually through the intermediary of an ad network. It circumvents safeguards by simulating normal human browsing behavior. In July 2012, Kindsight Security Labs reported that victims of ZeroAccess were downloading the bandwidth equivalent of 45 movies per month.