Flatpack-522.rar -

$ unrar x -p522 flatpack-522.rar Result: – the archive opens, extracting a single file named inner.rar . 3.2 Confirmed Password The correct password is 522 (the numeric suffix of the archive’s name). (If you want a more systematic approach, you could also script a quick for i in 0..999; do unrar x -p$i ... && break; done loop.) 4. Analyzing inner.rar The newly extracted inner.rar is again a RAR5 archive, but this time it is not encrypted .

# 4. Unpack the binary blob binwalk -e mystery.bin > /dev/null flatpack-522.rar

$ feh _mystery.bin.extracted/00000000.png The image is a . Decode it with zbarimg : $ unrar x -p522 flatpack-522

$ steghide extract -sf cover.png -p "" -xf hidden.txt (If steghide asks for a password, just press Enter – it’s not password protected.) && break; done loop

The archive is deliberately obfuscated: it contains a password‑protected inner RAR, a steganographically‑hidden image, and a small custom‑packed executable that must be run in a controlled environment. $ file flatpack-522.rar flatpack-522.rar: RAR archive data, version 5, created Tue Sep 5 13:42:10 2023, encrypted

# 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:

hidden.txt now contains: