PowerShell Security and Logging

PowerShell Security and Logging

PowerShell has become both a powerful administrative tool and a favorite attack vector for malicious actors. Securing PowerShell requires balancing administrative needs with security controls. Modern PowerShell versions include security features like Constrained Language Mode, Just Enough Administration (JEA), and comprehensive logging capabilities.

PowerShell logging provides crucial visibility into potentially malicious activity. Enable Script Block Logging to capture all PowerShell commands, including those obfuscated or executed through various methods. Module logging records pipeline execution details, while transcription creates text-based records of PowerShell sessions. Forward these logs to SIEM systems for analysis and alerting on suspicious patterns.

Implement PowerShell execution policies as a basic control mechanism, though understand their limitations as a security boundary. Use AppLocker or Windows Defender Application Control to provide stronger PowerShell restrictions. These technologies can limit PowerShell usage to specific users or signed scripts, preventing unauthorized script execution.

Just Enough Administration (JEA) enables delegating administrative tasks without granting full administrative privileges. JEA endpoints provide role-based access to specific PowerShell commands and parameters. This approach reduces the risk of credential theft while maintaining operational capabilities. Implement JEA for helpdesk operations, service account management, and other routine administrative tasks.