AppLocker: EXE or DLL allowed to run
An executable or DLL binary was permitted to execute by AppLocker application control policy.
Event ID 8003 (`Microsoft-Windows-AppLocker/EXE and DLL`) records permitted execution of binaries under AppLocker enforcement or audit rules (`PolicyName`, `RuleName`). Essential for verifying application baselines and tracking executed software.
Failure Reason / Root Cause:
Binary execution allowed by matching AppLocker rule (`RuleName`).
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>8003</EventID>
<Version>0</Version>
<Level>0</Level>
<Task>12544</Task>
<Opcode>0</Opcode>
<Keywords>0x8020000000000000</Keywords>
<TimeCreated SystemTime="2026-07-17T09:54:44.943Z" />
<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 AppLocker: EXE or DLL allowed to run -->
</EventData>
</Event>MITRE ATT&CK mapping
| ID | Technique | Tactic |
|---|---|---|
T1204 | System Services / User Execution | Execution |
Recommended actions
- Review allowed binaries executed from writable directories (`C:\Users\*\AppData`, `C:\ProgramData`) to identify potential AppLocker bypasses (`LOLBAS`).