Challenge Overview

You've been presented with a Windows virtual machine that appears to have fallen victim to a ransomware attack. Critical files seem to be encrypted, and a ransom demand is displayed. Alongside the ransomware executable, you find network capture files and potentially related log files left on the Desktop. Your mission is to analyze the situation, bypass the ransomware's mechanisms, and recover the original data without paying the ransom. This challenge involves analyzing a simulated ransomware attack. The primary goal is to decrypt a specific flag file (**Flag.txt.locked**) located in the user's Documents folder. To achieve this, you will need to: 1. Analyze the ransomware executable's behavior. 2. Examine provided network traffic captures (**.pcapng**) and TLS key log files (**sslkeylog.log**) to find the exfiltrated encryption key. 3. Understand and bypass the ransomware's Command-and-Control (C2) communication, specifically the payment verification check. 4. Decode the recovered key and use it within the ransomware's interface to decrypt the files.

What You Will Learn

  • Analyzing ransomware behavior within a compromised Windows environment.
  • Investigating network traffic captures to identify key information.
  • Extracting and decoding encryption keys from TLS key log files.
  • Understanding and bypassing ransomware Command-and-Control (C2) communication checks.
  • Using recovered keys to successfully decrypt encrypted file

Program Curriculum

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