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"Our analysis has led us to conclude that APT1 (Advanced Persistent Threat) is likely government-sponsored and one of the most persistent of China's cyber threat actors. We believe that APT1 is able to wage such a long-running and extensive cyber espionage campaign in large part because it receives direct government support," said the executive summary of the 60-page report. Mandiant said it believes the group behind the hacking is Unit 61398, within a wing of the People's Liberation Army. It said it has observed hacking attempts against nearly 150 victims over seven years. Hundreds of terabytes of data were involved, it said. A series of cyber attacks on America's most high-profile media outlets, reported earlier this month by The New York Times and the Wall Street Journal, as well as on Twitter and others, have revived concerns over Chinese hackers. The New York Times said hackers stole corporate passwords and accessed the personal computers of 53 employees after the newspaper published a report on the family fortune of China's Premier Wen Jiabao.