How does DNS Tunneling work?
The attacker initially acquires a fake domain name and then installs a tunneling program that is directed towards its server. The hacker easily contaminates the computer because the DNS requests are always allowed to move in and out of the firewall. The DNS resolver then gives the query to the fake domain server of the attacker, where the tunneling program is installed. The tunnel is used to extract data for malicious purposes. With the help of the DNS resolver, there is a route established between the company networks and the attacker. It is difficult to track the hacker’s computer as there is an indirect connection.Preventive measures for DNS Tunneling
- The tool should be designed such that it identifies both, more complex data extraction techniques and attacks based on preconfigured toolkits.
- To avoid the possession of data, a tool must be installed that blacklists the destinations which are to extract data. This activity must be done on a regular basis.
- A DNS firewall should be configured and designed such that it quickly identifies any intrusion. A firewall serves as a pathway for exfiltration.
- Users will make more viable security decisions when a DNS solution provides real-time analytics that examines any unusual queries and patterns. Tracking the state of the network by the DNS protected solution is more efficient.
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