Detect Powershell

Daniel Jeremiah@daniyyell

•updated Jun 19, 2026•0•0•2

This YARA rule detects the presence of various PowerShell commands and functions that are commonly used in malicious scripts. It looks for a combination of specific cmdlets like 'New-Object', 'Invoke-WebRequest', 'Invoke-Expression', 'Set-ExecutionPolicy Bypass', and 'Add-Type', as well as patterns for functions that might be used for obfuscation or specific malicious activities (e.g., 'vS35wIDY9U', 'wEAXbwCuxi'). The rule triggers if at least three of the defined strings or regular expressions are found, indicating potential PowerShell-based malicious activity.