Once Treasury was alerted by the service provider, we immediately contacted Cybersecurity and Infrastructure Security Agency (CISA) and have worked with law enforcement partner

The department was notified on Dec. 8 by a third-party software provider, BeyondTrust, that a hacker had secured access to a security key, which allowed the intruder to override certain security protocols.

The Treasury Department says Chinese hackers remotely accessed several employee workstations and unclassified documents after compromising a third-party software service provider