Ransomware is being used by at least 10 groups in the same way. Microsoft has issued a patch to fix the problem. Security experts are trying to figure out how the groups used the exploit to get around the world’s servers. The company is urging small businesses to update their systems and find out if they are at risk of being at risk from the exploit. The software was developed by a group in China, which is believed to be a state-run by the U.S. Department of Justice.
Source: https://www.helpnetsecurity.com/2021/03/15/microsoft-exchange-exploit/