Delicious Library, BB Edit, Angry Birds and other BitCoin mining piraticals
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http://www.macrumors.com/2014/02/27/bitcoin-trojan-angry-birds/
Only download from the sites of the actual developers (or the App Store).
Worried? Check here:
http://www.securemac.com/Remove-CoinThief-Trojan-Horse-Instructions.php