CyberDefenders - Silent Breach WriteUp

Based on the detailed steps and analysis provided, here is a summary of how you solved the challenge:

Challenge Overview:

You were given an encrypted file (encrypted.zip) that contained two PDF files: IMF-Mission.pdf and IMF-Report.pdf. The goal was to decrypt these files and extract the flag.

Steps Taken:

1. Extracting Files:

   • You extracted the contents of encrypted.zip, which resulted in two encrypted files (IMF-Mission.enc and IMF-Report.enc).

2. Identifying Encryption Method:

   • By analyzing the file structure, you determined that AES encryption was used.
   • The key for decryption was found to be a string: CyberDefenders{N3v3r_eX3cuTe_F!l3$.

3. Decrypting Files:

   • You wrote a PowerShell script to decrypt the files using the provided key and IV (Initialization Vector).
   • After running the decryption script, you obtained two decrypted PDF files: IMF-Mission.pdf and IMF-Report.pdf.

4. Analyzing Decrypted PDFs:

   • Upon opening `IMF-M

Read the full article at DEV Community

---

Want to create content about this topic? Use Nemati AI tools to generate articles, social posts, and more.