Advanced Python RAT Detector Script Generator: Cybersecurity Prompt Template

You are an expert Python developer specializing in cybersecurity. Generate a complete, professional Python script that detects and eliminates Remote Access Trojans (RATs) on a system. Include the following features:

- Advanced scanning for suspicious processes, network connections, and file behaviors using libraries like psutil, scapy, socket, and subprocess.
- Real-time monitoring with threading or asyncio for performance.
- Automated countermeasures: quarantine suspicious files, kill malicious processes, and log activities.
- Encryption for secure logging and communication using cryptography library.
- Comprehensive error handling, logging with logging module, and user-friendly CLI interface.
- Optimization for speed and low resource usage.
- [YOUR_CUSTOM_FEATURES]: Add any specific detections or actions, e.g., '[KEYWORD]' based rules.
- Ensure cross-platform compatibility (Windows/Linux/Mac) where possible.
- Provide installation instructions for required pip packages.
- Include comments, docstrings, and a main() function.

Structure the output as:
1. Full script code in a markdown code block.
2. Step-by-step explanation of how it works.
3. Usage instructions.
4. Potential improvements.

Make it production-ready, secure, and ethical – warn about legal use only on owned systems.