![]() All DNS requests will be able to pass the firewall without facing any restrictions. Second, the victim’s device has to be compromised with malware.The first step, for the threat actor, is to enlist a domain and point it to a server he controls and has already tunneling malware installed.By launching a DNS tunneling attack, threat actors transform the Domain Name System (DNS), which is highly used and usually trusted, into their secret weapon. The technique is used for avoiding filtering and firewall detection, and for secretly sending data through networks without being blocked. The malicious information is camouflaged and sent as DNS queries and responses. Hackers can use HTTP, SSH, or TCP to transfer malware and stolen information through DNS queries, usually undetected by firewalls. And of course, it can be used by the good guys as well as the bad guys of the digital world. The method is useful because not all networks support all protocols. Tunneling is, basically, wrapping up packets of data inside other packets, that use the protocol supported by the network. Tunnels are a way of transporting data through a network even if you use protocols that the network does not support. ![]() By DNS tunneling you can communicate data by using the DNS protocol even if that data does not use the same protocol.ĭuring DNS tunneling, a normal DNS transaction is used for exchanging information with a malicious server that acts like the DNS authoritative server for a specific DNS zone. DNS tunneling is one of the most common methods threat actors use for their cyberattacks.
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