It has been reported that Bitcoin mining malware has been found in the Google Play store. If your battery is draining faster than usual, your phone maybe running a copy of the BadLepricon Bitcoin mining malware. "The malware comes in the form of a wallpaper app. Google promptly removed five of these applications after we alerted them to the issue. The apps had between 100-500 installs each at the time of removal."[1]

[1] https://blog.lookout.com/blog/2014/04/24/badlepricon-bitcoin/

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Guy Bruneau IPSS Inc. gbruneau at isc dot sans dot edu