Sigma detection rules, expert-reviewed

Windows: ScreenConnect Temporary File Creation in ConnectWiseControl Temp

Flags file writes to ScreenConnect’s ConnectWiseControl\Temp staging directory from ScreenConnect.WindowsClient.exe.

Windows Application: ScreenConnect RMM File Transfer Activity (Event 201)

Flags ScreenConnect RMM file transfer events on Windows based on provider name, Event ID 201, and transfer action text.

Windows ScreenConnect Remote Command Execution (EventID 200)

Detects ScreenConnect command execution on Windows by matching EventID 200 with an 'Executed command of length' message.

Windows Process Creation: CLI CommandLine References NTFS ::$index_allocation Stream

Flags Windows CLI commands referencing the NTFS ::$index_allocation stream for potential hidden directory activity.

Windows Hidden Directory Creation Using NTFS $INDEX_ALLOCATION Stream

Alerts on Windows file events creating hidden NTFS content using the '::$index_allocation' alternate stream.

Windows Kerberos KDC: Certificate used without strong user mapping

Alerts on Windows KDC certificate validation events lacking strong certificate-to-user mapping (Event 39/41).

Windows Process Creation: Visual Studio Code Tunnel Execution with Renamed Binary

Flags Windows process executions that match renamed VS Code tunnel invocation patterns and related internal service startup.

Windows Service Registry Key ReadControl Access (Event ID 4663)

Flags READ_CONTROL access requests to service registry keys (\SYSTEM\ControlSet\Services\) via Windows Security Event 4663.

Windows: AddInUtil.exe LoLBin Executed from Non-Standard Directory

Alerts when AddInUtil.exe (AddInUtil.exe) runs from an uncommon directory path on Windows.

Windows Process Creation: Uncommon AddInUtil.exe Use of AddInRoot/PipelineRoot Paths

Alerts on AddInUtil.exe runs where AddInRoot/PipelineRoot command-line paths deviate from common VSTA locations.

Windows: Uncommon Child Processes Spawned by Addinutil.exe

Alerts when Addinutil.exe launches an uncommon child process, indicating potential proxy execution abuse.

Windows AddInUtil.exe Executed with Suspicious AddInRoot or PipelineRoot Parameters

Alerts on AddInUtil.exe runs using uncommon AddInRoot/PipelineRoot values targeting Temp, Desktop, Downloads, or public user paths.

Windows network connections initiated by AddinUtil.exe

Alerts on network connections initiated by Addinutil.exe, which is uncommon for this utility on Windows.

Windows: Diskshadow.exe Script Mode Execution from Suspicious File Paths

Alerts when diskshadow.exe runs with /s and a script path found in Temp/AppData/ProgramData/Users\Public-style directories.

Windows Diskshadow Script Mode Executes Script File with Uncommon .txt Extension

Alerts when diskshadow.exe runs with -s script mode and the script path/command includes an uncommon extension like .txt.