AMSI bypass PowerShell

[Ref].Assembly.GetType('System.Management.Automation.AmsiUtils').GetField('amsiInitFailed','NonPublic,Static').SetValue($null,$true)

Disables AMSI in the current PowerShell session: subsequent payloads are not scanned by in-memory antimalware.

Run it at the start of your PowerShell session, before loading in-memory tools (mimikatz, Rubeus, enumeration scripts). The one-liner sets amsiInitFailed to true and AMSI stops analyzing scriptblocks in that session.

AMSI is just one layer: EDR with hooks in amsi.dll or kernel telemetry detects the bypass or subsequent behavior. In PowerShell 7 (.NET Core), the amsiInitFailed field doesn't exist the same way: use the registry bypass or a patchless one.