Cyber criminal gang, dubbed AFT13, has developed Methbot robo-browser that spoofs all the necessary interactions needed to initiate, carry out and complete the ad transactions. The hackers registered more than 6,000 domains and 250,267 URLs impersonating brands and names of high-profile websites like ESPN, Vogue, CBS Sports, Fox News and the Huffington Post. Cyber criminals behind Methbot are using servers hosted in Texas and Amsterdam to power more than 570,000 bots with forged IP addresses.
Source: https://thehackernews.com/2016/12/methbot-ad-fraud.html