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TinyC2

★ 50 Open GitHub ↗

Reimplementing Havoc Pro Runtime Channel Switching and Cobalt Strike UDC2 features.

// repository documentation

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# TinyC2
TinyC2 is a small C2 Framework developed with the goal of reimplementing Havoc Pro Runtime Channel Switching and Cobalt Strike UDC2 features.

# Disclaimer
> This repository is intended for authorized, educational, or ethical security research purposes only. The tools and techniques within are not to be used against systems without explicit permission. The author assumes no liability for any unauthorized or illegal misuse of this project.

# Install

1. Install dependencies
```bash
sudo apt update
sudo apt install golang cmake make mingw-w64 openjdk-11-jdk zip
```
2. Clone the project
```bash
git clone --recurse-submodules git@github.com:0xPrimo/TinyC2.git
cd tinyc2
```

3. Download crystal palace project from [here](https://tradecraftgarden.org/crystalpalace.html) then run Install.sh:
```bash
sudo ./install.sh /path/to/dist
```

4. Build project
```
make
```

# Usage

```
./tinyc2 server/config.yaml
```

1. After you build the plugin you can register it with:
```
tinyc2> plugin [plugin name] [/path/to/plugin.so]
```

2. Create listener, and make sure the config is correct:
```
tinyc2> listener start [plugin name] [listener name] [/path/to/config.yaml]
```

3. Now generate the implant payload: 
```
tinyc2> listener generate [listener name]
```

https://github.com/user-attachments/assets/28a366fc-15a3-4a91-81ea-e947e300ff35

# Technical Details

In the recent releases of Havoc Pro and Cobalt Strike, a few new features caught my attention and found them really cool. The first one was Havoc Pro's Runtime Channel Switching. It's built into the Kaine-kit extension and allows the operator to reconfigure implant listener configuration or switch between different listeners at runtime.

> *A feature has been introduced to kaine that allows operators to dynamically update a session's listener configuration at runtime. Additionally, **sessions can switch between entirely different listener protocols at runtime**, such as transitioning from HTTP to SMB or vice versa, regardless of whether the listener is configured as P2P or Direct.*
> — *[Havoc Professional Release](https://infinitycurve.org/blog/release)*

The second one was Cobalt Strike's UDC2 (User-Defined Command and Control). It allows the operator to develop custom C2 channels by implementing their communication logic directly into a BOF (Beacon Object File). This BOF is then patched into beacon payload.

> … UDC2 addresses these issues by enabling Cobalt Strike users to **develop custom C2 channels as BOFs**. The UDC2 BOF is patched in on payload creation and is invoked by Beacon to proxy out all its traffic over the custom channel. This makes it possible to **combine custom C2 channels with custom UDRLs/transformations**. 
> — *[Cobalt Strike 4.12: Fix Up, Look Sharp!](https://www.cobaltstrike.com/blog/cobalt-strike-412-fix-up-look-sharp)*

## Architecture
To see how TinyC2 works, we first need to look at its core. TinyC2 is made up of three main components:

- **Plugin Management:** TinyC2 supports dynamically loading Go plugins at runtime to extend TinyC2 functionality. Currently, TinyC2 only support listener plugins.
- **Listener Management:** This component handles the listeners, allowing the user to start or stop them, as well as generate implant payloads from specific listener.
- **Implant Management:** This component  responsible for managing implant sessions for example request implant to execute command or terminating the session.

## Custom Listeners
In order to add a custom listener to TinyC2 the user should create a go plugin, think of it as a `DLL` that the server can load at runtime. this plugin should have one export with name `NewListener` and must return an object that implements `IListener` interface.

After writing your go plugin you will also need to implement the PIC which will be built with Crystal Palace linker.

This PIC will be used in two cases:

- When listener manager wants to generate implant payload.
- When implant manager wants to register a new channel to target implant payload at runtime.

See example.

# Todo
- more listener plugins
- more implant commands
- support x86
- support agent plugin

# Credit
- [A PIC Security Research Adventure - Tradecraft Garden](https://tradecraftgarden.org/) 
- [Havoc Professional Release](https://www.infinitycurve.org/blog/release)
- [@RastaMouse Crystal Palace series & crystal-kit repo](https://github.com/rasta-mouse/Crystal-Kit)
- [Cobalt Strike 4.12: Fix Up, Look Sharp!](https://www.cobaltstrike.com/blog/cobalt-strike-412-fix-up-look-sharp)

TinyC2

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