AD - Domain Admins Group - Track changes

Is there a way to find out who or when a "service account" or "user account" was added to the "Domain Admins" Security Group?

I need to track who on my dept added an account to it and track down what the need/purpose was...

Thanks
Christian HansAsked:
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Chris DentPowerShell DeveloperCommented:
Yes, if you have auditing enabled. You'll need to be logging changes to the member attribute to the event logs on your DCs.

Obligatory link:

https://technet.microsoft.com/en-us/library/cc731607(v=ws.10).aspx

Do you have that enabled already?
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Shaun VermaakTechnical Specialist/DeveloperCommented:
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Adam BrownSr Solutions ArchitectCommented:
FYI - Shaun's answer requires Server 2012 R2 to work. Previous versions of AD Powershell don't include that cmdlet. You may be able to view the replication metadata in earlier versions, but you'll need a more complex script.

Also, without being able to do that, you would not be able to view privileged account changes without auditing enabled and configured in AD to track directory changes. It's not set up by default, so open ADUC in the Advanced View, right click the group, go to properties, select the Security Tab, go to advanced, and then check the Auditing tab. If nothing is shown there, you can't view auditing data because it isn't being recorded. This is also the case if the auditing logs are not large enough to record data going back far enough.
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Shaun VermaakTechnical Specialist/DeveloperCommented:
Just install Powershell v5
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