Sigma detection rules, expert-reviewed

Windows PowerShell Software Enumeration via Script Block Content

Flags PowerShell registry queries for installed software metadata combined with selection and table formatting.

PowerShell command-line obfuscation indicators from special-character patterns (Windows)

Alerts on PowerShell executions whose command lines contain repeated special-character obfuscation patterns.

Windows Process Creation: Cmd Invokes PowerShell via Obfuscated Environment Variable Expansion

Alerts on cmd.exe command lines that use obfuscated environment-variable SET to execute PowerShell.

Windows Process Execution Using Obfuscated CMD to Pipe STDIN into PowerShell

Detects obfuscated cmd executions that launch PowerShell and reference $input/noexit patterns for STDIN-based execution.

PowerShell: Obfuscated invocation via Environment Variables in Script Block

Alerts on PowerShell script blocks launching cmd /c or /r with obfuscated set-and-{n} variable expansion patterns.

PowerShell Obfuscated stdin launcher using cmd /c or cmd /r patterns

Detects PowerShell script blocks that use obfuscated STDIN-driven cmd/powershell execution patterns.

PowerShell Module: Obfuscated Environment Variable Expansion via cmd /c set -f Pattern

Alerts when PowerShell module payloads obfuscate execution via cmd /c|/r and environment-variable-based set patterns.

PowerShell Module: Obfuscated STDIN Execution via cmd /c or cmd /r

Alerts when an obfuscated cmd->PowerShell payload uses stdin-style input and noexit/no-execution patterns.

Windows Service Control Manager: Obfuscated Environment Variable PowerShell via cmd /c set -f

Alerts on Service Control Manager event 7045 where a service ImagePath uses cmd /c|/r with "set" and -f formatting.

Windows System Service Control Manager spawning cmd with PowerShell and stdin input obfuscation

Flags SCM-created services whose ImagePath runs cmd to invoke PowerShell using stdin/input and -NoExit patterns.

Windows Security 4697: cmd.exe Launching Obfuscated PowerShell via Environment Variable Expansion

Alerts on EID 4697 service installation command lines containing obfuscated cmd.exe SET patterns used to execute PowerShell via environment variables.

Windows Security Event 4697 PowerShell Launch via cmd/stdin Obfuscation

Alerts on service creation events that run PowerShell through cmd with stdin-style obfuscation markers.

macOS split Command Used to Divide Files into Parts

Flags macOS process execution of split, indicating file splitting activity that may support staging or exfiltration.

Linux split Command Used to Divide Files for Possible Exfiltration

Identifies use of the Linux split command to break files into parts, potentially for staging or exfiltration.

Linux auditd: Shutdown, reboot, halt, poweroff or init-triggered system reboot

Identifies Linux shutdown/reboot command execution patterns using auditd execve telemetry.