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By dotCore
via aldeid.com
Submitted: Mar 09 2014 / 22:55

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 split these DNS requests on the other side. No specific tool is required but tcpdump and xxd.
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