MACShell V0.1 – Covert MAC-Based Shell Over Ethernet (Layer 2)

MACShell is a stealthy command-and-control shell that operates purely over Layer 2 (Ethernet), bypassing IP-based monitoring and filtering. It uses raw MAC frames for communication and AES encryption for confidentiality — making it ideal for red team engagements and low-noise post-exploitation.

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Features

• AES-256 encrypted payloads using Fernet
• Pure Layer 2 communication — no IP, TCP, or UDP
• Custom EtherType 0x1234 for covert signaling
• Interactive shell interface between server and agent
• Multi-threaded response sniffer with queuing
• Linux-only support (tested on Kali)

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⚠️ Disclaimer

This tool is provided for educational and authorized penetration testing purposes only.
Unauthorized usage is strictly prohibited. Use at your own risk.

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📦 Requirements

Agent & Server (Linux)

• Python 3.8+
• scapy
• cryptography

Install Dependencies

pip install -r requirements.txt

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How It Works

1. The agent sends a hello packet using a custom EtherType 0x1234.
2. The server listens, learns the agent's MAC, and initiates an interactive shell.
3. All communication (commands/responses) is encrypted with AES and transmitted via Ethernet frames.
4. Raw sockets are used to craft and sniff packets using Scapy.

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AES Key Sharing

The AES key is pre-shared in both scripts using Python’s Fernet:

key = b"q3yHiYdGNwFqkugDaG9f6_PRAolbQkAe6bQYRE3GE9s="  # Replace for real ops

To generate your own key:

python3 -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())"

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Usage

1. Start the Agent (on the target)

sudo python3 agent.py

2. Start the Server (on the attacker box)

sudo python3 server.py

3. Command Shell Example

agent> whoami
agent> uname -a
agent> id

🎬 Demo

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Testing Notes

• Both agent and server must be on the same Ethernet segment (L2).
• Ensure the correct iface (e.g., eth0, ens33) is set in both scripts.
• Traffic may not work over tun0 or Wi-Fi unless in promiscuous mode.
• Packets typically bypass firewalls/iptables due to operating below IP.

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Limitations & Detection

• May be detected by advanced IDS/IPS inspecting raw Ethernet frames.
• Can be blocked by network devices filtering unknown EtherTypes.
• Switches with MAC learning/flood protection may hinder operation.

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Tip for Stealth

• Avoid default EtherType 0x1234 in real-world scenarios.
• Use obfuscation, encryption rotation, and randomized beaconing for better OpSec.

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Made with ❤️ by Ozex for educational red teaming.