Windows Defender detected malware and initiated action
Windows Defender detected malware and started automatic remediation (`Quarantine` / `Remove`).
Event ID 1116 (`Microsoft-Windows-Windows Defender/Operational`) logs when Defender detects a threat and initiates remediation action (`Threat Name`, `Action ID`, `Path`).
Failure Reason / Root Cause:
Antivirus detection remediation process initiated against `Threat Name`.
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>1116</EventID>
<Version>0</Version>
<Level>0</Level>
<Task>12544</Task>
<Opcode>0</Opcode>
<Keywords>0x8020000000000000</Keywords>
<TimeCreated SystemTime="2026-07-17T09:54:44.852Z" />
<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 Windows Defender detected malware and initiated action -->
</EventData>
</Event>MITRE ATT&CK mapping
| ID | Technique | Tactic |
|---|---|---|
T1204.002 | User Execution: Malicious File | Execution |
Recommended actions
- Verify subsequent event `1117` (`Action completed successfully`) to ensure complete threat removal.