The URL is a well-known third-party web interface called TechBench by WZT . It is primarily used to generate direct download links for official Microsoft software, including Windows ISO images and Office installers. Key Functionality
However, there is a caveat: If you see tb.rg.adguard.net but you do not have AdGuard installed, your device might be infected with malware that is using a fake AdGuard domain to hide its traffic. Check if you actually run AdGuard software. If you do not, run a malware scan (Malwarebytes or Windows Defender). tb.rg adguard.net public.php
The public.php script likely performs the following functions: The URL is a well-known third-party web interface