Sigma detection rules, expert-reviewed

Windows Process Creation: svchost.exe Spawns mshta.exe (LethalHTA)

Alerts on Windows instances where svchost.exe spawns mshta.exe, indicating potential LethalHTA execution.

Windows NTFS Alternate Data Stream Creation with Non-Default Imphash

Alerts on NTFS ADS creation where the stream hash includes a non-null IMPHASH marker, consistent with hidden executables.

Windows Registry Persistence via Image File Execution Options GlobalFlag and SilentProcessExit

Flags registry changes to IFEO GlobalFlag and SilentProcessExit keys that can enable stealthy persistence or process redirection.

Windows Process Creation: Access to Domain Group Policy in SYSVOL

Flags Windows processes that reference SYSVOL \policies paths in their command line.

Windows File Events: Known Offensive PowerShell Script File Creation

Alerts on creation of known offensive PowerShell/PowerShell module filenames on Windows.

Windows Process Creation: Suspicious Child Programs Spawned by mshta, PowerShell, wscript, rundll32

Alerts when mshta/PowerShell and similar script hosts spawn tasks, download/transfer, or utility tools on Windows.

Windows: Suspicious Process Spawning from Microsoft Office Applications

Alerts when Office apps spawn common execution tools or scripts from typical attacker staging paths on Windows.

Windows Ping Hex IP Usage via Command Line

Flags ping.exe executions that pass a hex-encoded IPv4 address (0x????????) in the command line on Windows.

Windows Service Control Manager flags smbexec.py-style service installation via suspicious ImagePath

Flags suspicious Windows service installations matching a specific service name and BAT/delete command patterns in Event 7045.

Windows Security: Registry NetNTLM Downgrade Configuration Changes

Alerts on Windows registry changes that weaken NetNTLM/NTLM security settings via LSA compatibility and restriction values.

Windows Process Creation: taskmgr.exe launched in LOCAL_SYSTEM context

Flags taskmgr.exe process creation when initiated under a LOCAL_SYSTEM-equivalent user context string.

Windows Suspicious RDP Session Redirect via tscon.exe /dest:rdp-tcp#

Alerts on Windows process executions using tscon.exe-style RDP redirection to an "rdp-tcp#" destination.

Windows: Detect tscon.exe launched under SYSTEM context

Alerts on tscon.exe starting under a SYSTEM-associated user context based on Windows process creation logs.

Windows Registry Image File Execution Options Debugger Backdoor (sethc.exe/utilman.exe/osk.exe)

Alerts on registry Debugger hijacks for Windows login/accessibility binaries using Image File Execution Options.

Windows Backdoor Execution via Sticky Keys and Login-Screen Accessibility Tools

Flags winlogon.exe spawning command/script tools referencing login-screen accessibility binaries (sethc.exe, utilman.exe, osk.exe, etc.).