Methbot is a Russian bot system that has stolen more than $180 million from the online ad industry, at a rate of about $5 million dollars per day.
It was created by an unknown group of hackers who outsmarted several companies. The bot system runs through several fake websites, where bots watch ads that have been paid for by said companies. The bots all appear to be real people, this is why it took around 2 months to finally catch this system. Methbot abuses the online ad system that many websites run to make profit.