U.S. Treasury Secretary Janet Yellen met virtually on Monday with Chinese Vice Premier He Lifeng and raised concerns about "malicious cyber activity" carried out by Chinese state-sponsored actors, the Treasury Department said in a statement.

Threat actors entered Treasury Department systems through BeyondTrust. The breach may be related to the Salt Typhoon attacks.

US Treasury Secretary Janet Yellen told China’s Vice Premier He Lifeng of her “serious concern” regarding “malicious cyber activity” a week after the US said Chinese state-sponsored hackers had breached the Treasury Department’s computer networks.

The incident, which the US Treasury Department disclosed last week, happened in December and resulted in access to some of its workstations and unclassified documents