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By Joseph Menn, Jim Finkle and Aruna Viswanatha (Reuters) – A U.S.-led international operation disrupted a crime ring that infected hundreds of thousands of PCs around the globe with malicious software used for stealing banking credentials and extorting computer owners, the Justice Department said on Monday. Authorities in nearly a dozen countries worked with private security companies to wrest control of the network of infected machines, known by the name of its master software, Gameover Zeus. Court documents released on Monday said that between 500,000 and 1 million machines worldwide were infected with the malicious software, which was derived from the original Zeus trojan for stealing financial passwords that emerged in 2006. Officials charged a Russian man with hacking, fraud and money-laundering, and court documents suggested they suspect he wrote Zeus, one of the most effective pieces of theft software ever found.