Stewart attributed the new round of attacks to a prolific group based in Beijing that he and others have studied for years. Stewart's paper with Jackson tracks only one of the three dozen sophisticated malicious software programs that group favors.
That one family of code has hundreds of variants and has been used in at least 64 campaigns, including the penetration of the audio-visual equipment company, Stewart said. The same program has been used against government offices and 10 industries, including mining, media and communications.
Of the infections the researchers were able to identify, the greatest number were in Japan, followed by India, South Korea, Taiwan and the United States.
Stewart said the Beijing group is probably as big as the Shanghai-based crew that drew wide attention in February after security firm Mandiant said it was a specific unit within China's People's Liberation Army. China disputed the report and said it does not hack Western companies.
Although characteristics of both the Beijing and Shanghai groups sometimes show up inside the same compromised company, the Beijing group tends to focus more on activists, including those involved with Tibetan issues, Stewart said.
He has cataloged about 275 families of malicious software to date.
(Reporting by Joseph Menn. Editing by Andre Grenon)
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