Windows Security Log Event ID 4934
4934: Attributes of an Active Directory object were replicated
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I haven't been able to produce this event. Have you? If so, please start a discussion (see above) and post a sample along with any comments you may have! Don't forget to sanitize any private information.
Directory Service replication has little to no security relevance. I recommend disabling these 2 subcategories:
Directory Service ReplicationDetailed Directory Service Replication
Since DCSync and DCShadow have come out I've changed my mind about the above statement. Check out this webinar AD Attack Deep Dive: Gaining Persistence using DCSync and DCShadow with Mimikatz
Free Security Log Resources by Randy
Setup PowerShell Audit Log Forwarding in 4 Minutes