A network share object was modified

// EVENT DEFINITION:

A network share (`SMB/CIFS Share`) had its permissions, path, or configuration modified.

// DETAILED TELEMETRY & CONTEXT:

Event ID 5143 logs modifications to network shares (`Share Name`, `Share Local Path`). Threat actors who obtain administrative access frequently modify existing network share permissions (`ShareAccessList`) or alter share paths to expose sensitive internal drive locations (`C$`, `SYSVOL`, backup folders) to unauthenticated users.

[ ! ]Failure Reason / Root Cause Analysis

SMB network share modification (`ShareName` settings updated by `SubjectUserName`).

Operational Metadata & Applicability

Log Category:Object Access

Audit Type Classification:Success Audit

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

Threat Hunting Keywords:

5143network share modifiedsmb share permissionsshareaccesslist changed

MITRE ATT&CK Framework Alignment

T1039

Data from Network Shared DriveTactic: Collection

T1021.002

Remote Services: SMB/Windows Admin SharesTactic: Lateral Movement

Mitigation Playbook & Recommended SOC Actions

•Inspect `ShareAccessList` and `ShareLocalPath`. Verify that everyone (`S-1-1-0`) or anonymous users (`S-1-5-7`) were not granted full control or read access over administrative shares.

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>5143</EventID>
    <Version>0</Version>
    <Level>0</Level>
    <Task>12544</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8020000000000000</Keywords>
    <TimeCreated SystemTime="2026-07-17T09:54:44.356Z" />
    <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 network share object was modified -->
  </EventData>
</Event>

Correlated / Related Security Event IDs

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