A new email-based extortion campaign is reportedly threatening to flood websites with bot-generated fake traffic so that Google's anti-fraud mechanisms block their AdSense advertising service accounts.

According to security researcher Brian Krebs, the extortionists are telling email recipients that they will soon see a message from Google warning them that the number of ads they can show will be limited as a result of suspicious bot traffic. The note said the fake traffic has a "100% bounce ratio and thousands of IPs in rotation -- a nightmare for every AdSense publisher."

"More also we'll adjust our sophisticated bots to open, in endless cycle with different time duration, every AdSense banner which runs on your site." the extortion email continues. "As a result your daily RPC revenue will be increased, but AdSense traffic assessment algorithms will detect very fast such a web traffic pattern as fraudulent."

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