Https- Ranoz.gg File Qfuhzzxf -

$ gobuster dir -u https://ranoz.gg/ -w /usr/share/wordlists/dirb/common.txt -x .bak,.old,.php~ -t 50 Result: download.php.bak returned a 2 kB file. <?php // Simple file downloader – DO NOT expose to the public! $allowed = ['QfUhZZXf', 'public.txt', 'welcome.html']; if (isset($_GET['file'])) $file = basename($_GET['file']); if (in_array($file, $allowed)) $path = __DIR__ . "/files/" . $file; if (file_exists($path)) header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename="'.$file.'"'); readfile($path); exit;

PNG file: QfUhZZXf (640x480) Chunk tEXt (keyword=Comment, text=...) Chunk iTXt (keyword=secret, compression=deflate, text=...) The iTXt chunk named contains a compressed blob. Extract it with exiftool : https- ranoz.gg file QfUhZZXf

$ 7z l secret_payload ... 0 0 0 0 0 -rw-r--r-- 0 0 secret.txt Extract: $ gobuster dir -u https://ranoz

$ binwalk QfUhZZXf 0 0x0 PNG image, 640 x 480, 8-bit/color RGBA, non-interlaced A PNG header at offset 0! Let’s verify: "/files/"

$ 7z x secret_payload Result: secret.txt $ cat secret.txt Congratulations! You've found the hidden flag:

Run binwalk and strings for deeper insight:

<form method="GET" action="download.php"> <input type="text" name="file" placeholder="File name"> <input type="submit" value="Download"> </form> The parameter is file . Testing with some basic values: