Sigma detection rules, expert-reviewed

OpenCanary - Nmap NULL Scan Targeting Detected

Detects OpenCanary logtype 5003 events consistent with NMAP NULL scan targeting.

OpenCanary Application Logs: Nmap FIN Scan Targeting (Logtype 5005)

Detects Nmap FIN scan targeting against an OpenCanary node using application logs with logtype 5005.

Windows Registry: User Shell Folders Value Modification via reg.exe or PowerShell

Alerts when reg.exe or PowerShell modifies User Shell Folders/Shell Folders Startup-related registry values.

Windows: Kernel Driver Utility (KDU) and hamakaze.exe Execution

Alerts on KDU/hamakaze.exe launches with command-line parameters associated with kernel driver loading.

Windows devcon.exe Command Line Disabling VMware VMCI Device

Flags devcon.exe command lines that disable VMware VMCI using VMCI PCI ID or VMWVMCIHOSTDEV driver markers.

Windows Registry Set: Disable Windows Credential Guard by Zeroing EnableVirtualizationBasedSecurity

Alerts on registry value changes that zero Credential Guard/LSA configuration flags to disable virtualization-based secret protection.

Windows Registry Delete of Credential Guard EnableVirtualizationBasedSecurity or LsaCfgFlags

Flags deletion of Credential Guard/LSA-related registry values that may weaken virtualization-based secret protection.

Windows Credential Guard Registry Key Tampering via reg.exe or PowerShell Command Line

Alerts on PowerShell/Reg.exe commands that add/modify/delete DeviceGuard/LSA registry values tied to Credential Guard.

Windows AMSI Disabled by Registry Value Modification (AmsiEnable)

Alerts when Windows Script Settings AmsiEnable is set to 0x00000000 to disable AMSI.

Windows Process Creation: Registry Modification to Disable ETW AutoLogger via reg.exe or PowerShell

Flags reg.exe or PowerShell registry changes aimed at disabling WMI AutoLogger EventLog session components.

Windows Process Command-Line Tampering of AMSI Registry Values via reg.exe or PowerShell

Alerts on reg.exe or PowerShell command lines attempting to add/set AMSI enable registry settings.

Windows File Events: Legitimate Applications Writing Executables to Uncommon Locations

Alerts when selected Windows binaries write files to typically uncommon directories such as Temp, ProgramData, AppData, or system areas.

Web Browser Opens .HTM/.HTML from Downloads Folder on Windows

Flags browser processes opening .htm files from a user’s Downloads folder on Windows, a pattern consistent with HTML attachment activity.

Linux process creation: suspicious child processes launched by Node.js server command execution

Flags Linux processes where a Node.js server child-process pattern launches suspicious shell/command tooling.

Windows GitHub Self-Hosted Runner Execution via Runner.Worker and Runner.Listener

Alerts on Windows process activity from GitHub self-hosted runner Worker/Listener indicating spawnclient or run/configure operations.