“Undetected for nearly a year, the Chinese intruders executed a sophisticated attack that gave them ‘administrator privileges’ into the computer networks at the Office of Personnel Management, mimicking the credentials of people who run the agency’s systems, two senior administration officials said. The hackers began siphoning out a rush of data after constructing what amounted to an electronic pipeline that led back to China, investigators told Congress last week in classified briefings.
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Source: Attack Gave Chinese Hackers Privileged Access to U.S. Systems – The New York Times