Most organizations have a firewall that acts as a filter between their sensitive internal networks and the threatening global Internet. DNS tunneling has been around for a while. But it continues to cost companies and has seen hackers invest more time and effort developing tools. A recent study[1] found that DNS attacks in the UK alone have risen 105% in the past year. DNS tunneling is attractive–hackers can get any data in and out of your internal network while bypassing most firewalls. Whether it’s used to command and control (C&C) compromised systems, leak sensitive data outside, or to tunnel inside your closed network, DNS Tunneling poses a substantial risk to your organization. Here’s everything you need to know about the attack, the tools and how to stop it.

How Hackers Use DNS Tunneling to Own Your Network (cynet.com)