What Is DNS Hijacking?

DNS hijacking is a cyberattack that manipulates DNS settings or DNS infrastructure to redirect users from legitimate websites to attacker-controlled destinations.

Key takeaway: Think of DNS hijacking as a rigged GPS for the internet — it quietly sends users to the wrong destination, potentially exposing them to phishing, credential theft, malware, or other attacks.

How Does DNS Hijacking Work?

The Domain Name System (DNS) translates human-readable domain names into IP addresses. When a user visits a website, their device relies on a DNS resolver to determine which server to contact.

In a DNS hijacking attack, an attacker compromises or alters part of this process so that DNS requests return an incorrect IP address. A user may enter the correct address for a bank, for example, but be redirected to a malicious website designed to look legitimate.

Cybercriminals rely on four main methods to pull off this redirection:

• Local DNS hijacking: Malware changes DNS settings on a user’s device.
• Router DNS hijacking: Attackers compromise a router and modify its DNS or DHCP configuration, potentially affecting every device on the network.
• DNS resolver compromise: A “Man in the Middle (MITM)” attacker gains control of a DNS resolver or its configuration and manipulates the responses it provides.
• Registrar or domain hijacking: Attackers compromise a domain owner’s registrar account and modify the domain’s authoritative DNS records.

Why Does DNS Hijacking Matter?

DNS hijacking can undermine the trust users place in websites and online services. A successful attack can redirect customers to phishing pages where attackers attempt to steal passwords, payment information, or other sensitive data.

For organizations, the consequences can include data theft, service disruption, reputational damage, and costly incident response. A compromised domain or DNS infrastructure can also make it difficult for customers to reach legitimate services until the underlying issue is identified and resolved.

Because DNS is a fundamental part of internet connectivity, attacks against it can affect users before traditional security controls have an opportunity to detect malicious activity.

DNS Hijacking vs. DNS Spoofing

DNS hijacking and DNS spoofing both involve directing users to an incorrect destination, but they generally refer to different attack mechanisms.

The terms can sometimes overlap in practice, and DNS spoofing can be used as part of a broader DNS hijacking attack.

How to Prevent DNS Hijacking

Protecting DNS requires multiple layers of security:

• Secure registrar accounts: Enable multi-factor authentication (MFA), use strong unique credentials, and restrict domain-management access to authorized administrators.
• Deploy DNSSEC: DNS Security Extensions use cryptographic signatures to help DNS resolvers validate the authenticity and integrity of DNS data.
• Secure routers and endpoints: Change default credentials, apply security patches, and regularly review DNS and DHCP configurations.
• Monitor DNS activity: Analyze DNS traffic for unusual queries, destinations, or configuration changes and block known malicious domains where appropriate.
• Use secure DNS infrastructure: Centralized management, access controls, logging, and continuous monitoring can help organizations detect and respond to DNS-related threats.

Solutions such as EfficientIP’s 360° DNS Security can provide additional visibility and protection by monitoring DNS activity and helping organizations enforce security policies at the DNS layer.