Heh I gave a talk at DefCon Skytalks last week on this exact exfil method and C&C structure with a live demo using code we wrote....interesting.
183 karma · joined November 4, 2014
rfc1034 is vague but rfc2181 clears it up. https://tools.ietf.org/html/rfc1034 https://tools.ietf.org/html/rfc2181
The original comment is correct.
This would be handing your financial data over to a third party to old in an unsecured format. Yikes.
:(