Sigma detection rules, expert-reviewed

Windows PowerShell Base64-encoded shellcode in ScriptBlockText

Flags PowerShell script blocks containing Base64 strings matching known shellcode markers.

Windows ProcDump Command Lines Targeting LSASS Memory Dumps

Identifies suspicious ProcDump usage with dump flags and LSASS-related markers to indicate potential credential harvesting.

Antivirus Web Shell Signature Matches Across ASP, JSP, PHP, Perl, and VBS

Alerts on AV signatures indicating web shells/backdoors (ASP/JSP/PHP/Perl/VBS/Webshell) to support fast investigation of persistence.

Antivirus alerts for suspicious file paths and web/script file extensions

Alerts on AV hits involving suspicious file locations and web/script-related extensions.

Windows PowerShell Suspicious Encoded Command-Line Execution

Alerts on PowerShell launched with encoded-command switches and embedded encoded content patterns in the command line.

Windows Process in Suspicious Folder Initiating Network Connections to File Sharing Domains

Alerts on outbound connections to file sharing domains from Windows executables running out of suspicious temp/recycle/task paths.

Windows LSASS process access blocked by Attack Surface Reduction (Windows Defender event 1121)

Alerts on windefend EventID 1121 for blocked access to lsass.exe, excluding common benign process callers.

Windows Registry Run Key Set to Executable in Suspicious Folder

Flags new Windows Run key values pointing to executables in suspicious folders, excluding known update/Spotify patterns.

Windows Process Creation: PowerShell Command Execution Hidden in DLL Invocation

Flags DLL-invoking Windows binaries whose command lines include PowerShell execution strings.

Windows: .NET Reflection Attempt to Disable AMSI via amsiInitFailed

Alerts on Windows command lines referencing amsiInitFailed and .NET reflection patterns to disable AMSI scanning.

DNS TXT Answers Containing Command Execution Keywords (IEX, Invoke-Expression, cmd.exe)

Alerts on DNS TXT answers containing IEX/Invoke-Expression or cmd.exe strings indicative of execution-oriented payloads.

PowerShell NTFS Alternate Data Stream Writes via set-content/add-content

Alerts on PowerShell Set/Add-Content operations that specify -Stream, indicating potential NTFS Alternate Data Stream writes.

Windows: SafetyKatz LSASS dump default file indicator (Temp\debug.bin)

Flags Windows file events with a target path ending in \Temp\debug.bin, consistent with SafetyKatz LSASS dump output.

Windows Registry Explorer Run Key Persistence Pointing to Suspicious Paths

Alerts on writes to the Explorer Run policy registry key with details pointing to suspicious filesystem paths.

Windows Registry Events: CMSTP Execution via cmmgr32.exe TargetObject

Flags registry events referencing \cmmgr32.exe, consistent with CMSTP-related execution behavior on Windows.