Around the time that the Federal Bureau of Investigation was examining the equipment recovered from the wreckage of the Chinese spy balloon shot down off the South Carolina coast in February, American intelligence agencies and Microsoft detected what they feared was a more worrisome intruder: mysterious computer code that has been popping up in telecommunications systems in Guam and elsewhere in the United States. The code, which Microsoft said was installed by a Chinese government hacking group, raised alarms because Guam, with its Pacific ports and vast American air base, would be a centerpiece of any American military response to an invasion or blockade of Taiwan.
Read the article: The New York Times
