A registry value was modified

// EVENT DEFINITION:

A registry key value was created, altered, or deleted within an audited registry path.

// DETAILED TELEMETRY & CONTEXT:

Event ID 4657 captures granular modifications to registry values (`Object Type: Key`) when a System Access Control List (SACL) is applied. It logs the exact registry key path, the old value, the new value, and the process (`ProcessName`) causing the change.

[ ! ]Failure Reason / Root Cause Analysis

Registry modification on an audited key (e.g., Run keys, LSA configurations, Service keys).

Operational Metadata & Applicability

Log Category:Object Access

Audit Type Classification:Success / Failure Audit

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

Threat Hunting Keywords:

4657registry value modifiedsaclrun keyregistry persistence

MITRE ATT&CK Framework Alignment

T1547.001

Registry Run Keys / Startup FolderTactic: Persistence

T1112

Modify RegistryTactic: Defense Evasion

Mitigation Playbook & Recommended SOC Actions

•Inspect the `ProcessName` and check whether the modified key establishes persistence (`HKLM\Software\Microsoft\Windows\CurrentVersion\Run`).
•Correlate with process creation event `4688`.

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>4657</EventID>
    <Version>0</Version>
    <Level>0</Level>
    <Task>12544</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8020000000000000</Keywords>
    <TimeCreated SystemTime="2026-07-17T09:54:44.271Z" />
    <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 A registry value was modified -->
  </EventData>
</Event>

Correlated / Related Security Event IDs

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