Sigma detection rules, expert-reviewed

Windows Registry RDP Terminal Services Sensitive Settings Tampering

Flags Windows registry changes to sensitive RDP/Terminal Services settings such as shadowing, remote assistance, security, and InitialProgram.

Windows Process Creation: Image contains NTFS 8.3 short filename patterns

Flags process creation events where the Image contains Windows 8.3 short-name patterns (e.g., ~1.exe, ~2.ps1) to evade image-based detections.

Azure Audit Logs: User Added to Privileged Eligibility Role

Alerts on Azure audit log events indicating a user was added as an eligible or permanent member to a privileged role.

Windows Exploit Guard Controlled Folder Access: Added Allowed Application for Blocked Path

Alerts when an app is added to Exploit Guard’s AllowedApplications list to bypass controlled folder restrictions for risky paths.

Windows Registry: Exploit Guard ProtectedFolders Value Deleted

Alerts on deletion of registry values under Exploit Guard Controlled Folder Access ProtectedFolders.

Windows Process Creation: wusa.exe Cab Extraction From Suspicious Directory Paths

Flags wusa.exe with /extract: originating from common temp/public paths, a potential CAB-based payload unpacking behavior.

Windows Process Command Line Contains NTFS 8.3 Short Filename Patterns (~1/~2.*)

Detects Windows command lines referencing NTFS 8.3 short names like ~1.exe or ~2.ps1.

Windows Process Creation: Remove-MpPreference Used to Tamper Windows Defender Settings

Flags process executions that call Remove-MpPreference with Defender tampering-related parameters.

Windows PowerShell ScriptBlock: Remove-MpPreference Tampering of Defender Configuration

Detects PowerShell commands removing Defender preferences via Remove-MpPreference with additional Defender setting indicators.

Windows Suspicious File Creation in AppData Outside Common Subdirectories

Alerts on new .exe/.dll/.ps1/.lnk and other files created under unusual AppData locations outside Local/LocalLow/Roaming.

Windows Defender Exploit Guard Tamper via Controlled Folder Access AllowedApplications or ProtectedFolders Changes

Alerts on Windefend EventID 5007 when Exploit Guard ProtectedFolders or AllowedApplications lists are modified.

Azure Audit Logs: Removal of Privileged Role Eligible Members

Flags Azure audit log events indicating bulk removal of eligible members from privileged roles.

Windows RDP Tunneling Using plink.exe on Local Port 3389

Alert on plink.exe command lines referencing 127.0.0.1:3389 or port 3389, suggesting potential RDP tunneling on Windows.

Windows Suspicious IIS Module Registration via w3wp.exe, appcmd.exe, and PowerShell/gacutil

Flags w3wp.exe-launched appcmd.exe module registrations involving PowerShell publication or gacutil GAC installation.

Windows PsExec Named Pipe Creation from Suspicious Paths (PSEXESVC)

Alerts on PsExec pipe \PSEXESVC creation when the executing image path is in public/temp/desktop/downloads locations.