Medusa

Medusa is a cross-platform agent compatible with both Python 3.8 and Python 2.7.

Installation

To install Medusa, you'll need Mythic installed on a remote computer. You can find installation instructions for Mythic at the Mythic project page.

From the Mythic install root, run the command:

./mythic-cli payload install github https://github.com/MythicAgents/Medusa.git

Once installed, restart Mythic to build a new agent.

Notable Features

• File browser compatibility with upload/download
• Windows injection example using CreateRemoteThread
• maOS clipboard reader, screenshot grabber and TCC database parsing examples
• Eval() of dynamic Python code
• Basic Authentication Proxy compatibility

Commands Manual Quick Reference

The base agent and included commands all use built-in Python libraries, so do not need additional packages to function. Agents will run the commands in threads, so long-running uploads or downloads won't block the main agent.

Python Versions

Both versions of the Medusa agent use an AES256 HMAC implementation written with built-in libraries (adapted from here), removing the need for any additional dependencies beyond a standard Python install. As such the agent should operate across Windows, Linux and macOS hosts. It's worth mentioning that this crypto implementation does introduce some overhead when handling large files (screenshotting, downloads, etc.) but it's workable.

Py2 vs Py3 Commands

Within the Payload_Type/Medusa/agent_code directory, you will see base_agent files with both py2 and py3 suffixes. Likewise, similar file extensions can be seen for individual function files too.

These are read by the builder.py script to firstly select the right base Python version of the Medusa agent. builder.py will then include commands that are specific to the chosen python version. In the case where a command only has a .py extension, this will be used by default, with the assumption being that no alternative code is needed between the Py2 and Py3 versions.

Supported C2 Profiles

Currently, only one C2 profile is available to use when creating a new Medusa agent: http (both with and without AES256 HMAC encryption).

HTTP Profile

The HTTP profile calls back to the Mythic server over the basic, non-dynamic profile. GET requests for taskings, POST requests with responses.

Thanks

• Browser scripts and agent code adapted from @its_a_feature_ and @djhohnstein.
• MacC2 and this blog post from Cedric Owens
• The crypto wizardry found here.
• Agent icon from flaticon.com