A network share object was modified
A network share (`SMB/CIFS Share`) had its permissions, path, or configuration modified.
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:
SMB network share modification (`ShareName` settings updated by `SubjectUserName`).
Raw Event XML snippet
<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="2026-07-17T09:54:44.934Z" />
<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>MITRE ATT&CK mapping
| ID | Technique | Tactic |
|---|---|---|
T1039 | Data from Network Shared Drive | Collection |
T1021.002 | Remote Services: SMB/Windows Admin Shares | Lateral Movement |
Recommended 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.