$ zsteg -a cover.png Output shows:
Cannot open encrypted file. Use -p option to specify a password. Thus we need the password. 3.1 Brute‑Force / Dictionary Attempts A quick dictionary attack with common passwords (e.g., password , 12345 , admin ) fails. The creator hints in the challenge description: “The key is hidden inside the name of the pack itself.” The file name flatpack‑522 suggests the password may be related to the number 522 . flatpack-522.rar
# 5. Decode QR code from extracted PNG FLAG=$(zbarimg _mystery.bin.extracted/00000000.png | awk -F: 'print $2') echo "✅ Flag: $FLAG" Running the script prints: $ zsteg -a cover
# 2. Extract inner archive (no password) unrar x inner.rar Decode QR code from extracted PNG FLAG=$(zbarimg _mystery
# 4. Unpack the binary blob binwalk -e mystery.bin > /dev/null
$ binwalk mystery.bin Output:
$ binwalk -e mystery.bin This creates a folder _mystery.bin.extracted containing 00000000.png . Open it: