DNS hijacking

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DNS Hijacking

Overview

Domain Name System (DNS) hijacking is a malicious activity where attackers redirect queries from legitimate DNS servers to rogue ones. This technique allows attackers to manipulate the resolution of domain names, users to fraudulent websites without their knowledge. DNS hijacking can result in data theft, phishing attacks, and malware distribution. It is a significant threat to both individuals and organizations, as it can compromise sensitive information and disrupt normal operations. As of October 2023, DNS hijacking remains a prevalent threat, with various methods employed by attackers to achieve their objectives.

How it works

DNS hijacking involves intercepting and redirecting DNS queries. The Domain Name System translates human-readable domain names into IP addresses that computers use to identify each other on the network. When a user types a URL into a browser, a DNS query is sent to a DNS server to resolve the domain name into an IP address. In DNS hijacking, attackers manipulate this process to redirect users to malicious sites.

Types of DNS Hijacking

  1. Local DNS Hijacking: Attackers install malware on a user's device to change the local DNS settings, redirecting queries to malicious servers.
  1. Router DNS Hijacking: Attackers exploit vulnerabilities in routers to alter DNS settings, affecting all devices connected to the network.
  1. Man-in-the-Middle (MitM) Attack: Attackers intercept DNS queries between a user and a DNS server, redirecting them to rogue servers.
  1. Rogue DNS Server: Attackers set up a fake DNS server that responds to queries with malicious IP addresses.

Observed use

DNS hijacking has been used in various cyber campaigns. Attackers often employ this technique to redirect users to phishing websites that mimic legitimate ones, capturing sensitive information such as login credentials and financial data. In some cases, DNS hijacking has been used to distribute malware by redirecting users to sites hosting malicious downloads.

Notable Incidents

  • Sea Turtle Campaign: In 2019, the Sea Turtle campaign targeted government and private organizations in the Middle East and North Africa. Attackers used DNS hijacking to redirect users to phishing sites and intercept sensitive communications.
  • DNSpionage Campaign: This campaign, identified in 2018, targeted entities in the Middle East. Attackers used DNS hijacking to redirect users to malicious sites, facilitating credential theft and espionage activities.

Detection

Detecting DNS hijacking can be challenging, as it often occurs without visible signs to the user. However, several methods can help identify potential hijacking:

  1. DNS Query Monitoring: Regularly monitor DNS queries for unusual patterns or unexpected IP addresses.
  1. Network Traffic Analysis: Analyze network traffic for signs of redirection to unknown or suspicious IP addresses.
  1. DNSSEC (Domain Name System Security Extensions): Implement DNSSEC to authenticate DNS responses and prevent tampering.
  1. Router Logs: Check router logs for unauthorized changes to DNS settings.

Mitigation

Mitigating DNS hijacking involves a combination of preventive measures and response strategies:

  1. Use Secure DNS Services: Employ DNS services that offer security features such as DNSSEC and filtering of malicious domains.
  1. Regularly Update Firmware: Keep router firmware and software up to date to protect against vulnerabilities.
  1. Implement Strong Authentication: Use strong, unique passwords for routers and network devices to prevent unauthorized access.
  1. Educate Users: Train users to recognize signs of phishing and suspicious websites.
  1. Enable Two-Factor Authentication (2FA): Use 2FA for accounts to add an extra layer of security against credential theft.

DNS Hijacking Process

Types of DNS Hijacking

See also

Sources

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Categories: Techniques | Incidents
Last updated: September 13, 2026