Alert changes to sensitive AD groups using MDI (Microsoft Defender for Identity) Microsoft Defender for Identity is a very powerful tool when it comes to track changes to users and groups in your on-prem Active Directory. When used in combination of the advanced hunting capabilities available in the Microsoft 365 Defender portal and custom detection rules you can very easily automate the change tracking.
If you protect any on-prem Active Directory, you should be aware to changes to any privileged groups. Microsoft itself list a few of them in their documentation on Active Directory Domain Services and in the Defender for Identity documentation adds additional ones.
Reference:
https://cloudbrothers.info/en/alert-sensitive-ad-groups-mdi/