The headquarters of Unit 61398, center, in Shanghai. The unit of the People’s Liberation Army is believed to have resumed its attacks on American companies and government agencies.
WASHINGTON — Three months after hackers working for a cyberunit of China’s People’s Liberation Army went silent amid evidence that they had stolen data from scores of American companies and government agencies, they appear to have resumed their attacks using different techniques, according to computer industry security experts and American officials.
It is not clear precisely who has been affected by the latest attacks. Mandiant, a private security company that helps companies and government agencies defend themselves from hackers, said the attacks had resumed but would not identify the targets, citing agreements with its clients. But it did say the victims were many of the same ones the unit had attacked before.
The hackers were behind scores of thefts of intellectual property and government documents over the past five years, according to a report by Mandiant in February that was confirmed by American officials. They have stolen product blueprints, manufacturing plans, clinical trial results, pricing documents, negotiation strategies and other proprietary information from more than 100 of Mandiant’s clients, predominantly in the United States.
According to security experts, the cyberunit was responsible for a 2009 attack on the Coca-Cola Company that coincided with its failed attempt to acquire the China Huiyuan Juice Group. In 2011, it attacked RSA, a maker of data security products used by American government agencies and defense contractors, and used the information it collected from that attack to break into the computer systems of Lockheed Martin, the aerospace contractor.
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