Malicious Chrome extensions: a cat and mouse game
Google Chrome users are being targeted these days by a wave of attacks that uses malicious extensions hosted in the official Chrome Web Store. The attack appears to be of Turkish origin and is using Facebook to spread. We saw users of different nationalities infected with the malicious extensions, which the cybercriminals are sending to the official store regularly, in a cat-and-mouse game.
As we already reported in March 2012, Brazilian cybercriminals were able at that time to host a malicious extension in the Chrome Web Store. Since then in June 2012 Google has changed the way users can add third party browser extensions i.e. not allowing the installation that are not hosted on the official Web Store. More recently Google removed the possibility of silent installations, which has been widely abused by third parties.
Maybe for these reasons bad guys started to concentrate their efforts to upload bad extensions to the official store. Now it’s the turn of Turkish cybercriminals; they were able to host several extensions there in the last few days.