Federal authorities announced Tuesday that they have erased Chinese malware from thousands of computers across the United States.

The FBI says it was authorized to mass-remove “PlugX” malware from more than 4,000 compromised machines in the United States

The FBI hacked about 4,200 computers across the US as part of an operation to find and delete PlugX, a malware used by state-backed hackers in China to steal information from victims, the Department of Justice announced on Tuesday.