Sigma detection rules, expert-reviewed

Windows PowerShell IEX Invocation Patterns in Process Creation Command Lines

Alerts on suspicious PowerShell command lines that pipe or otherwise invoke IEX and may include Base64 decoding.

Windows PowerShell Download and Execution Cradles

Flags PowerShell commands that download remote content and immediately execute it using IEX/Invoke-Expression.

Azure Sign-in Logs: MFA Denied Based on Authentication Requirement

Flags Azure sign-ins requiring MFA where the status indicates "MFA Denied."

Windows: reg.exe Registry Tampering of Windows Defender Policy Keys

Detects reg.exe adding Defender DWORD policy values to disable or suppress multiple protection features via Windows registry.

Windows LSA PPL Protection Setting Modification via reg.exe or PowerShell Command Line

Flags Windows command lines that alter LSA PPL-related Control\Lsa registry settings using reg.exe/PowerShell property changes.

Windows Suspicious Parent Processes: Unusual Child Creation by System Utilities

Alerts when predefined suspicious Windows parent executables spawn unusual or unrecognized child processes.

Windows Service Control Manager: HackTool Service Installation or Start via Suspicious Service Names

Detects Windows service creation/start events tied to hacktool-like service names or ImagePath indicators.

Windows Scheduled Task Backdoor Execution via cmd.exe or PowerShell (System EventID /create /delete)

Flags cmd.exe/powershell.exe command lines that create a System/EventID-based scheduled task to run a payload.

Windows Registry Defense Impairment via Explorer Hide* Policy Values

Flags registry set events that change Explorer hide-related DWORD values under Windows policy keys to impair user visibility.

Windows Registry Policy Change to Disable/Impair Internal Tools and UI Features

Detects registry policy edits that disable Windows tools/features or alter related system behavior via specific DWORD values.

Windows Service Installation via Scripted ImagePath Indicators (Event 7045)

Identifies suspicious Windows service installations that embed script host execution via Event ID 7045 ImagePath patterns.

Windows Service Installation with Suspicious ProgramData/Root Executable Image Paths

Flags Windows service installs (Event 7045) that reference suspicious EXE paths in ProgramData or directly under C:\.

Windows Service Installation with PowerShell Download and Hidden Execution

Alerts on Windows service creation (7045) with ImagePath patterns indicating hidden/staged command execution.

Windows Registry Run Key Entries Containing PowerShell Execution Strings

Alerts when registry Run key value data contains PowerShell launch or encoded download/execution strings on Windows.

Windows Webserver Parent Process Launching Credential Dumping and Exfiltration Commands

Flags web server processes spawning child commands consistent with credential dumping, exfiltration, and privilege changes.