A user's local group membership was enumerated
A process enumerated the local security groups to which a specific user belongs.
Event ID 4798 logs local group membership enumeration (`NetUserGetLocalGroups` / `NetUserGetGroups`). High-volume bursts of `4798` across multiple user accounts indicate active local privilege and group reconnaissance by automated reconnaissance tools (e.g., BloodHound, SharpUp, WinPEAS, or `net user`).
Failure Reason / Root Cause:
Local user group membership enumeration API call executed by `ProcessName`.
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>4798</EventID>
<Version>0</Version>
<Level>0</Level>
<Task>12544</Task>
<Opcode>0</Opcode>
<Keywords>0x8020000000000000</Keywords>
<TimeCreated SystemTime="2026-07-17T09:54:44.913Z" />
<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 user's local group membership was enumerated -->
</EventData>
</Event>MITRE ATT&CK mapping
| ID | Technique | Tactic |
|---|---|---|
T1087.001 | Account Discovery: Local Account | Discovery |
T1069.001 | Permission Groups Discovery: Local Groups | Discovery |
Recommended actions
- Inspect `ProcessName` and `SubjectUserName`. If `cmd.exe`, `powershell.exe`, or unlisted binaries enumerate accounts across multiple systems rapidly, investigate for internal reconnaissance (`T1087.001`).