File transfer via DNS

Description


You guys already know DNS encapsulation (e.g. dns2tcp) to transfer data over DNS but I've found a very interesting post from Johannes Ullrich who introduces a relatively stealthy concept (https://isc.sans.edu/diary/Packet+Tricks+with+xxd/10306) to transfer data via DNS requests. It consists of sending hex parts of a file as part of DNS requests on one side and to capture and