PowerShell AMSI Bypass via Known Patterns or Reflection

Ankit Mehta@Secvyn

•updated Jun 30, 2026•0•0•1

Detects attempts to bypass the Antimalware Scan Interface (AMSI) in PowerShell processes. The rule looks for known bypass strings, memory patching via Marshal, reflection-based disabling of AmsiUtils, or base64-encoded AMSI patch targets.