Ever wondered how malware actually works under the hood? In this video, we strip away the mystery and show you just how simple it is to understand a basic ransomware script using Python.

We will break down the logic to help you understand reverse engineering and how Red Teams simulate attacks to secure systems.

⚠️ DISCLAIMER: This content is strictly for educational purposes and cybersecurity research. The goal is to understand the attack vector to better defend against it. Do not use this code on systems you do not own or have explicit permission to test.

What You’ll Learn: In this tutorial, we build a script from scratch that traverses directories and encrypts files, simulating the core behavior of ransomware.

● Directory Traversal: How to use the os library to hunt for target files.
● Cryptography: Utilizing the Fernet library to generate keys and encrypt data bytes.
● Logic Controls: Ensuring the script doesn’t encrypt itself or system folders.

Key Concepts Covered:

● Python os and cryptography libraries.
● File handling (Reading/Writing Binary).
● Symmetric Encryption (Fernet).

This is Part 1. In the next video, we will reverse the process and write the Decrypter to restore our files.

Timestamps:
00: 00 Introduction to Malware Creation
00: 28 Disclaimer and Educational Purpose
00: 45 Setting Up the Environment
01: 28 Traversing Directories and Listing Files
02: 06 Creating the Ransomware Script
03: 33 Sanity Check and Debugging
04: 34 Filtering Files for Encryption
06: 44 Generating the Encryption Key
07: 43 Encrypting the Files
11: 48 Conclusion and Next Steps

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