Sigma detection rules, expert-reviewed

Windows Defender Windefend AMSI Detection (Event ID 1116)

Flags Windows Defender AMSI detections via windefend Event ID 1116 with SourceName set to AMSI.

Windows Registry Set: .NET COR/CORECLR Profiling Environment Variables Enabled

Alerts on registry writes enabling .NET CLR/CORECLR profiling variables like COR_ENABLE_PROFILING and COR_PROFILER.

Windows Process Creation: MpCmdRun.EXE Used to Download Files via DownloadFile url

Alerts when MpCmdRun.exe is executed with DownloadFile and url, indicating Defender utility file download behavior.

WMI scrcons.exe Loading Script and WMI DLLs via Image Load (Windows)

Alerts when scrcons.exe loads vbscript/wbem/WMI script DLLs, suggesting WMI ActiveScriptEventConsumer activity.

Windows Process Creation: Mouse Lock Execution with “Misc314” Indicator

Alerts on Windows executions of Mouse Lock where Company includes “Misc314” and CommandLine contains “Mouse Lock_”.

Windows Defender windefend Event 1013: Malware detection history deletion

Alerts when Windows Defender deletes its malware/PUA detection history via windefend Event ID 1013.

Windows Security Event 5145: SMB Write Access to Admin Share (C$)

Flags non-machine accounts writing via SMB to the C$ administrative share using Security EventID 5145.

Windows windefend Event ID 5012: Windows Defender virus scanning disabled

Flags when Windows Defender disables virus scanning via windefend Event ID 5012.

Windows windefend: Windows Defender threat detection and mitigation events

Alerts on windefend events indicating Windows Defender malware detection and potential remediation activity.

Windows windefend EventID 5001: Windows Defender real-time protection disabled

Flags windefend Event ID 5001 indicating Windows Defender real-time protection was disabled.

Windows windefend: Microsoft Defender malware and PUA scanning disabled (Event ID 5010)

Flags Windows Defender disabling malware and PUA scanning using Windefend Event ID 5010.

Windows Defender antimalware grace period expired (Event ID 5101)

Alerts when Windows Defender signals its antimalware grace period expired via windefend Event ID 5101.

Windows Service Control Manager: Windows Defender Threat Protection Disabled

Flags Service Control Manager events where the Windows Defender Threat Protection (Defender Antivirus) service is stopped.

Windows webserver-spawned recon commands probing scripting tool help (perl/python/wget)

Flags webserver child processes running perl/python/python3/wget help commands to probe available tooling on the host.

Windows DLL Load Indicates Potential Azure Browser SSO OAuth Token Request Abuse

Alerts on MicrosoftAccountTokenProvider.dll loads on Windows, with process-based exclusions, as a signal for potential Azure Browser SSO token activity.