PowerShell Security Best Practices

This blog reviews how attackers leverage PowerShell for reconnaissance, persistence, and lateral movement, summarizes common PowerShell-based bypass techniques (in-memory execution, obfuscation, signed-binary proxy execution, AMSI bypasses, whitelisting workarounds), and provides defensive recommendations—Constrained Language Mode, AppLocker/WDAC, transcript/scriptblock/module/protected logging, JEA, AMSI, DSC, and EDR—while advising to block or monitor System.Management.Automation.dll and improve logging and monitoring.