An operation was performed on an object

// EVENT DEFINITION:

Access or replication operation performed against an Active Directory directory object (`DS-Replication-Get-Changes`).

// DETAILED TELEMETRY & CONTEXT:

Event ID 4662 is logged on Domain Controllers when an account accesses or modifies Active Directory objects with specific control access rights. Specifically, when an account requests the rights `DS-Replication-Get-Changes` (`1131f6aa-9c07-11d1-f79f-00c04fc2dcd2`) and `DS-Replication-Get-Changes-All` (`1131f6ad-9c07-11d1-f79f-00c04fc2dcd2`), it indicates **DCSync** activity—an adversary using replication protocols to dump all domain password hashes directly without touching disk or NTDS.dit.

[ ! ]Failure Reason / Root Cause Analysis

Normal domain controller replication between authorized DCs, or **DCSync** attack executed by a compromised user/computer identity (`mimikatz lsadump::dcsync`).

Operational Metadata & Applicability

Log Category:Directory Service Access

Audit Type Classification:Success / Failure Audit

Supported Operating Systems:Windows Server 2016, 2019, 2022 / Windows Client 10, 11 (Enterprise / Pro)

Threat Hunting Keywords:

dcsync4662directory service access1131f6ad-9c07-11d1-f79f-00c04fc2dcd2replicationmimikatz dcsync

MITRE ATT&CK Framework Alignment

T1003.006

OS Credential Dumping: DCSyncTactic: Credential Access

Mitigation Playbook & Recommended SOC Actions

•Alert immediately on any Event ID 4662 where `Properties` contains `1131f6ad-9c07-11d1-f79f-00c04fc2dcd2` AND the `SubjectUserName` is NOT an authorized Domain Controller computer account (`$?`).
•Regularly audit accounts granted `Replicating Directory Changes` permissions in Active Directory.

Representative Windows Event XML Schema

<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-A5BA-3E3B0328C30D}" />
    <EventID>4662</EventID>
    <Version>0</Version>
    <Level>0</Level>
    <Task>12544</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8020000000000000</Keywords>
    <TimeCreated SystemTime="2026-07-17T09:54:44.274Z" />
    <EventRecordID>1048576</EventRecordID>
    <Correlation />
    <Execution ProcessID="612" ThreadID="1024" />
    <Channel>Security</Channel>
    <Computer>DC01.enterprise.internal</Computer>
    <Security />
  </System>
  <EventData>
    <Data Name="SubjectUserSid">S-1-5-18</Data>
    <Data Name="SubjectUserName">SYSTEM</Data>
    <Data Name="SubjectDomainName">NT AUTHORITY</Data>
    <Data Name="SubjectLogonId">0x3e7</Data>
    <!-- Event telemetry fields specific to An operation was performed on an object -->
  </EventData>
</Event>

Correlated / Related Security Event IDs

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