Tunneling Data and Commands Over DNS to Bypass Firewalls

Tunneling Data and Commands Over DNS to Bypass Firewalls:

No matter how tightly you restrict outbound access from your network, you probably allow DNS queries to at least one server. Adversaries can abuse this “hole” in your firewall to exfiltrate data and establish stealthy Command and Control (C2) channels that are very difficult to block. via Pocket