A listing of content that is meant as reference or to alleviate potential confusion.
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Asaf Nadler's September 21, 2017 blog post. https://blogs.akamai.com/2017/09/introduction-to-dns-data-exfiltration.html
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DNSCat, a DNS tunnel that "wont make you skick and kill you" https://github.com/iagox86/dnscat2