U.S. and key allies accuse China of Microsoft Exchange cyberattacks - Axios

https://www.axios.com/china-cyberattacks-nato-181e71d2-7414-45f3-9463-c8b1d46392c1.html

The U.S., NATO, European Union, U.K., Australia, Canada, New Zealand and Japan say they can now, “with high confidence,” attribute the March attack using the Exchange flaw to cyberattackers affiliated with China’s state security ministry. That attack crippled thousands of computers around the world.