A trusted logon process has registered with the Local Security Authority
A process registered with LSA as a trusted logon process (`SeTcbPrivilege`).
Event ID 4611 logs whenever a service or process connects to `lsass.exe` and registers as a trusted logon handler (`LsaRegisterLogonProcess`). Legitimate components like `winlogon.exe` and `services.exe` register at boot, but unauthorized registrations indicate privileged subversion or token manipulation.
Failure Reason / Root Cause:
Trusted logon process registration with the LSA (`SeTcbPrivilege` exercised).
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>4611</EventID>
<Version>0</Version>
<Level>0</Level>
<Task>12544</Task>
<Opcode>0</Opcode>
<Keywords>0x8020000000000000</Keywords>
<TimeCreated SystemTime="2026-07-17T09:54:44.857Z" />
<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 trusted logon process has registered with the Local Security Authority -->
</EventData>
</Event>MITRE ATT&CK mapping
| ID | Technique | Tactic |
|---|---|---|
T1134 | Access Token Manipulation | Privilege Escalation |
Recommended actions
- Verify the exact binary path and digital signature of any process registering after system boot.
- Investigate any anomalous processes holding `SeTcbPrivilege`.