https://www.bleepingcomputer.com/news/microsoft/microsoft-warns-of-rise-in-password-sprays-targeting-cloud-accounts/

The Microsoft Detection and Response Team (DART) says it detected an increase in password spray attacks targeting privileged cloud accounts and high-profile identities such as C-level executives.

Password spraying is a type of brute force attack where the attackers attempt to gain access to large lists of accounts using a small number of commonly used passwords.