Domain Name Systems (DNS) exfiltration is a cyberattack tactic in which a attacker uses DNS requests to covertly send private information from a compromised system to an outside server.
Advanced cyberattacks often use DNS exfiltration to capture sensitive data, including bank records, intellectual property, credentials, and private company information.
An attacker can access a network by using malware, phishing scams, or vulnerabilities. Once inside, they acquire private information, proprietary data, and login credentials, among other sensitive data.
According to experts, anonymizing server connections, Domain Name System (DNS), Hypertext Transfer Protocol (HTTP) and Hypertext Transfer Protocol Secure (HTTPS) tunneling, direct Internet Protocol (IP) addresses, fileless attacks, and remote code execution are common tactics used by attackers to steal data from businesses or organizations’ networks and systems.
The manner in which DNS Data Exfiltration operates is that the stolen data is broken up into smaller chunks, disguised as DNS queries, and then sent to hostile DNS servers for reconstruction.
In order to place the encoded data chunk as a subdomain of the attacker’s domain, the malware creates DNS queries.
Businesses or organizations can use threat intelligence or reputation to restrict known malicious IPs or domains in order to detect DNS tunneling.Threat intelligence is comprehensive, useful data regarding cybersecurity risks.Security teams of organisations or businesses can detect, mitigate, and prevent cyberattacks more proactively by using threat intelligence.It is important to regularly monitor DNS query strings and Query Characteristics.
Along with other security measures like intrusion detection systems (IDS), intrusion prevention systems (IPS), and routine security audits, firewalls are important in preventing DNS exfiltration. DNS queries to known malicious domains can be blocked by a properly configured firewall, which can also monitor DNS traffic. In order to stop massive volumes of data from being stolen, it can also restrict the size and frequency of DNS searches.
