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They introduced ads in the search results on Google and Bing.

There are 295 such extensions. Many of them acted as the blocker. You can find them in the Chrome Web Store keywords adblock, adguard, ublock and others similar. In addition, the experts discovered a malicious weather widgets and programs for creating screenshots.

Users install a malicious extension, more than 80 million times. However, analysts believe that some loads could provide bots.

245 of 295 extension did not fulfill the stated functions. The most they could do is change the background for the new tab page in the browser. Most of them received the command from the remote server and uploaded the code which implemented the ad in the search results.

Google has already started to remove the detected expansion.