PSAmsi is a tool for auditing and defeating AMSI signatures.

It's best utilized in a test environment to quickly create payloads you know will not be detected by a particular AntiMalware Provider, although it can be useful in certain situations outside of a test environment.

When using outside of a test environment, be sure to understand how PSAmsi works, as it can generate AMSI alerts.

Installation instructions and an introduction to using PSAmsi are available in the Wiki.

You are only authorized to use PSAmsi (and payloads created with PSAmsi) on systems that you have permission to use it on. It was created for research purposes only.

A huge thanks to the following people whose code is used by PSAmsi:

• Daniel Bohannon (@danielhbohannon) - PSAmsi currently uses Invoke-Obfuscation for all of it's obfuscation. Thanks Daniel!
• Matt Graeber (@mattifestation) - PSAmsi uses PSReflect to call the AMSI functions exported from the AMSI dll, while staying in memory. Thanks Matt!