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Employees of ESET, which is based on the development of antivirus programs detected the malware JS/CoinMiner.A. She discreetly activated when you log on to browsers and produces cryptocurrency. This program has strong differences from those of similar programs. It mining occurs when users visit certain websites. Scripts for hashing are implemented by hackers on various (mostly popular) sites with a large attendance.This program can mine Monero, Litecoin and Feathercoin.