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⚠️ CRITICAL WARNING

This software is a MALWARE SIMULATOR designed for EDUCATIONAL PURPOSES ONLY.

• DO NOT run this on critical systems.
• DO NOT use this to encrypt files you do not own.
• ALWAYS keep the generated the_key.key file safe, or data recovery will be impossible.

The developer (Dev_Nand) accepts no responsibility for data loss or misuse of this code.

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🔐 About The Project

CrimsonLock is a Python-based ransomware simulator designed to demonstrate the mechanics of Availability Attacks and Symmetric Encryption.

It utilizes the Fernet (AES-128 in CBC mode) implementation from the cryptography library to securely lock files within a designated sandbox environment. This tool allows security researchers to understand how ransomware operates, how keys are generated, and the importance of key management.

• 💥 Attack Phase: Encrypts target files into unreadable ciphertext.
• 🔑 Key Generation: Generates a cryptographically strong master key.
• 🚑 Recovery Phase: Decrypts and restores files using the master key.

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⚙️ Installation

1. Clone the Repository

git clone https://github.com/devnand-47/CrimsonLock.git
cd CrimsonLock

2. Install Dependencies

   pip install -r requirements.txt
   

   3. Setup the Sandbox Create the sandbox folder and add some dummy files to test:

mkdir sandbox
echo "This is a secret" > sandbox/secret.txt
echo "Bank Password: 123" > sandbox/bank.txt

Usage Guide Run the main script to enter the command menu:

python main.py

Step 1: Generate Key Select [1]. This creates the_key.key. Note: In a real attack, this key is sent to the attacker. If you lose this file, the data in the sandbox is lost forever. Step 2: Encrypt (The Attack) Select [2]. The script will iterate through the sandbox folder and encrypt every file.

Check sandbox/secret.txt -> It will now be gibberish.

A RANSOM_NOTE.txt will be dropped.

Step 3: Decrypt (The Fix) Select [3]. The script reads the_key.key and reverses the encryption.

Check sandbox/secret.txt -> It will be readable again. 📂 Project Structure

CrimsonLock/
├── sandbox/             # ⚠️ TARGET ZONE: Put dummy files here
│   ├── secret.txt
│   └── bank.txt
├── main.py              # The Malware Logic
├── requirements.txt     # Dependencies
└── the_key.key          # Generated Master Key (Do not delete!)

⚠️ Legal Disclaimer This tool is provided for EDUCATIONAL PURPOSES only.

The developer (Dev_Nand) demonstrates this code to teach Cryptography and Malware Analysis. Using encryption logic to lock files on systems you do not own is illegal and classified as a cybercrime.

Always run this tool in a controlled environment.

Developed with 💀 by Dev_Nand

### **Why this is better:**

• Reliability: The Typing SVG service is much more stable than the Capsule Render service for complex headers.
• Aesthetic: The animated typing text (CRIMSON LOCK... RANSOMWARE SIMULATOR...) fits the "hacker" vibe of this specific project perfectly.

Once you confirm this is working, we can finally move on to Project 2: Payload-Viper (The Code Obfuscator).