PowerShell AMSI Bypass via Reflection or Known Bypass Strings

Ankit Mehta@Secvyn

•updated Jun 29, 2026•0•0•1

Detects the execution of PowerShell commands intended to disable or bypass the Antimalware Scan Interface (AMSI). This is achieved by referencing internal AMSI methods such as 'AmsiUtils', 'amsiInitFailed', or 'amsi.dll' within command line arguments, typically used to neutralize endpoint security scanning during malicious script execution.