Post-09.rar

If the file list is hidden, the are encrypted (RAR 5.0 standard). 3. Cracking & Extraction (If Encrypted)

Once the password is found, extract the contents: unrar x POST-09.rar . 4. Advanced Forensic Checks POST-09.rar

Ensure the header starts with 52 61 72 21 1A 07 (RAR 5.0) or 52 61 72 21 1A 07 00 (RAR 4.0). If the file list is hidden, the are encrypted (RAR 5

If the archive is password-protected and no hint was provided in the challenge description: Use rar2john POST-09.rar > hash.txt . If the file list is hidden

The flag is typically found inside a .txt file within the archive or hidden within an image's metadata (EXIF) if an image was the only content extracted. FLAG{...} or CTF{...}

Generate a SHA-256 hash to ensure the file hasn't been corrupted during transit.