Chinese state-sponsored hackers breached the US Treasury Department, accessing unclassified files on computers of top officials including Secretary Janet Yellen. Over 400 devices were compromised using a third-party software vendor's security flaws.

In the latest instance of a high-profile cybersecurity breach, Chinese state-sponsored hackers accessed hundreds of US Department of Treasury’s systems, including the devices of Treasury Secretary Janet Yellen,

The US Treasury Department announced in a letter back in December that it had been the victim of a security breach, attributing it to a “China state-sponsored Advanced Persistent Threat actor.” Now we know more about the extent of the hack,