How Hacker Sleuths Found Zhang Changhe in Trail From Myrtle Beach to China [Getty Images]

Joe Stewart, director of malware research at Dell SecureWorks, a unit of Dell Inc., left, walks back to his desk after talking to Silas Cutler, security researcher, right, in Myrtle Beach, South Carolina, U.S., Friday, Jan. 18, 2013. Stewart, 42, spends his days hunting for Internet spies. Photographer: Stephen Morton/Bloomberg via Getty Images

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