How To Bypass FULLY Updated Windows Defender & Windows 11 With Nim for a STABLE Reverse Shell

Introduction

This tutorial guides you through the process of creating a reverse shell executable using Nim, specifically designed to bypass Windows Defender and run on fully updated Windows 11 systems. This technique can be used for educational purposes in penetration testing and cybersecurity training. Always ensure you have permission to test any systems you work on.

Step 1: Setting Up Your Environment

To begin, you need to install Nim and set up your development environment.

1. Install Nim:

   • Visit the Nim website and follow the installation instructions for your operating system.
   • Ensure that you have the latest version of Nim installed.

2. Install Git (if not already installed):

   • Git is necessary for cloning repositories. Download it from the official website and follow the installation instructions.

3. Clone the Reverse Shell Repository:

   • Open your terminal or command prompt.
   • Run the following command to clone the repository that contains the reverse shell code:

     git clone https://github.com/Sn1r/Nim-Reverse-Shell
     

Step 2: Navigating to the Project Directory

Once you have cloned the repository, navigate to the project directory.

1. Change Directory:
   • Use the command line to navigate into the cloned directory:

     cd Nim-Reverse-Shell
     

Step 3: Compiling the Code

Now that you are in the project directory, it’s time to compile the Nim code into a Windows executable.

1. Compile the Source Code:
   • Use the following command to compile the Nim code into an executable:

     nim c -d:danger --app=gui reverse_shell.nim
     

   • The -d:danger flag allows the code to perform potentially unsafe operations, while --app=gui creates a GUI application which can help avoid detection.

Step 4: Testing the Executable

After compiling, you should test the executable to ensure it works as intended.

1. Run the Executable:
   • Locate the compiled .exe file in the bin directory.
   • Execute the file and ensure that it successfully establishes a reverse shell connection.

Step 5: Bypassing Windows Defender

To ensure that the executable bypasses Windows Defender:

1. Use Obfuscation Techniques:

   • Rename the .exe file to something innocuous.
   • Consider using tools that obfuscate the code further to avoid detection.

2. Test with Windows Defender:

   • Make sure to run the executable in a controlled environment with Windows Defender enabled to verify that it successfully bypasses detection.

Conclusion

In this tutorial, you learned how to compile a reverse shell executable using Nim that bypasses Windows Defender on updated Windows 11 systems. Remember to use this knowledge responsibly and ethically. If you're interested in further exploration, consider looking into additional obfuscation techniques or other programming languages that can achieve similar results. Always stay informed about the latest cybersecurity practices and tools.