As I promised during my 2014 Derbycon talk (amongst other places), this is an initial release of my complete re-write/re-design of the dnscat service / protocol. It's now a standalone tool instead of being bundled with nbtool, among other changes. :)
more here........https://blog.skullsecurity.org/2015/dnscat2-beta-release
more here........https://blog.skullsecurity.org/2015/dnscat2-beta-release