Evgeniy Mikhailovich Bogachev is under indictment for administering various versions of hacking software including Game Over Zeus. He is believed to be in Russia.
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Since emerging in 2013, Cryptolocker has been used to attack about 200,000 computers, half of which were in the U.S. In its first two months, criminals extorted an estimated $27 million from victims, Deputy Attorney General James Cole said in June.