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Introduction

This module allows you to generate a Windows EXE that evades against Microsoft Windows Defender. To achieve this, multiple techniques are used:

Shellcode encryption

RC4 is used to prevent the shellcode from getting caught by static scanning.

Custom Compiler

A custom compiler is also used with evasion in mind. This compiler can keep the EXE randomized, also harder to reverse-engineer with typical tools.

Anti-Emulation

An anti-emulation technique is used to prevent the shellcode from being analyzed at run-time. Technically, this is taking advantage of a weakness in Windows Defender's scan engine (an artifact,a poor design, etc), so every once a while this part may be tweaked to keep up with Microsoft updates.

Traffic Encryption

Some Meterpreters support encryption, such as RC4 or HTTPS. You either should consider using a custom payload of your own to avoid detection, or at least use one that supports encryption for best results.

Demonstration

The following demonstrates how to generate a payload with windows_defender_exe, and successfully evades Windows Defender: