More than 4,000 U.S. computers and networks have had malware files deleted by the FBI, which said it did not collect other information during the remote operations.

To retrieve information from and send commands to the hacked machines, the malware connects to a command-and-control server that is operated by the hacking group. According to the FBI, at least 45,000 IP addresses in the US had back-and-forths with the command-and-control server since September 2023.

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.