Cyber Security – Introduction to DNS Tunneling

DNS tunneling is a process where an attacker encodes data in DNS queries and responses to communicate between a compromised system and a remote server. This technique involves the Domain Name System (DNS), which is typically used to convert domain names into IP addresses.

DNS Tunneling is a strategy for a digital exploit that encodes the information of different programs or protocols in DNS inquiries and responses. DNS tunneling frequently incorporates information payloads that can be added to an exploited domain name server and used to control a distant system and applications. Normally, DNS tunneling requires the undermined framework to have outside organization availability, as DNS tunneling expects admittance to an interior DNS server with network access. Hackers should likewise control a system that can go about as a definitive server to execute the server-side tunneling and information payload executable programs.

DNS tunneling works by encapsulating data in DNS queries and responses to create an encrypted communication channel between a corrupt machine and an attacker-controlled remote server. The malware on the infected device converts data into subdomains of DNS queries, which are subsequently forwarded to the attacker’s DNS server. This server decodes the data and can return commands encoded in DNS replies. Because DNS traffic is often permitted to travel through firewalls and security devices without being thoroughly examined, DNS tunneling allows the attacker to avoid security measures, steal data, and maintain command and control over the infected system.

• Analyzing DNS Traffic Patterns
• Unusual Domain Requests
• High DNS Traffic Volume
• Intrusion Detection Systems (IDS)
• DNS Monitoring Utilities

• Use DNS Filtering
• Monitor DNS Traffic
• Deep Packet Inspection (DPI)
• Network Segmentation
• Access Controls
• Use Antivirus and Anti-Malware
• Use Intrusion Detection System
• Use Intrusion Prevention System

DNS tunneling is a process where an attacker encodes data in DNS queries and responses to communicate between a compromised system and a remote server. Using DNS tunneling attackers can establish a communication route between a hacked system and a remote server they control. DNS Tunneling enables them to steal data, run commands, and keep permanent control over infected systems.

What tools are there to detect DNS tunneling?

• Intrusion Detection and Prevention Systems
• DNS Security Solutions
• DNS Logging and Analytics

What ports are used for DNS tunneling?

Port 53.

What is the iodine tool for DNS tunneling?

Iodine is a tool that uses the DNS protocol to tunnel IPV4 traffic via firewalls, network security groups, and network access lists while avoiding detection.