Sigma detection rules, expert-reviewed

Windows: Suspicious HTA Startup Folder Creation by FoxitPDFReader.exe

Alerts on FoxitPDFReader.exe creating .hta files in the Startup Programs folder, which can indicate persistence.

Windows ScreenConnect RMM System Command Execution via cmd.exe

Flags cmd.exe launched by ScreenConnect.ClientService.exe with a TEMP\ScreenConnect command-line path.

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.

AWS CloudTrail: AWS Identity Center Identity Provider Configuration Changes

Detects CloudTrail identity center events that associate or change the external identity provider configuration.

Windows Registry Scheduled Task Cache Key Creation Detection

Flags registry event activity under Scheduled TaskCache indicating scheduled task creation or updates on Windows.

Windows Scheduled Task File Creation Activity (File Event)

Flags file creation under Windows scheduled task directories that may indicate new scheduled task persistence.

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.