According to security reporter Brian Kerbs, hackers are selling computer programs that automatically click on competitors advertisements in order to drain their budget.
The service automotates bots that commit click fraud throughout the Google Adsense network. By having bots click on the ads, a business can quickly drain their competitors ads to prevent it from being seen.
The service is available for sale on underground Russian forums and has both subscription and flat rate options. For $100, buyers of the service can target 3 to 10 ad units for up to 24 hours. For a flat rate of $1,000, small businesses can drain the ads of a handful of competitors and prevent them from being seen indefinitely.
Fees are paid upfront with the use of virtual currencies such as WebMoney.
Source: Brian Kerbs, ” Hacker service drains Google AdWords budgets,” Sydney Morning Herald, June 28, 2014