DNS hijacking is a cyberattack in which criminals redirect your DNS queries to malicious servers, sending you to fake websites instead of legitimate ones. To fix DNS hijacking: reset your router to factory settings, change all DNS passwords, enable DNSSEC on your domain, scan devices for malware, and consider engaging a cyber security expert to perform a full DNS audit.
What Is DNS and Why Do Attackers Target It?
The Domain Name System (DNS) works like the internet’s address book. When you type a domain name like “google.com” into a browser, DNS translates that name into an IP address (e.g., 142.250.80.46) so your device can find the correct server. Without DNS, you would need to memorize numeric IP addresses for every website.
Attackers target DNS because it sits at the foundation of all internet traffic. By compromising DNS, a criminal can silently redirect an entire organization’s users to phishing pages, intercept login credentials, or take a website offline — all without the victims realizing anything is wrong.
DNS hijacking is categorized as a form of cyber attack that exploits trust in internet infrastructure rather than vulnerabilities in applications or user behavior.
What Are the Different Types of DNS Hijacking Attacks?
Local DNS Hijacking (Malware-Based)
An attacker installs Trojan malware on a victim’s computer. The malware modifies the local DNS settings stored on that device, pointing queries to a rogue DNS server controlled by the attacker. This type of attack affects only the infected machine and is sometimes referred to as local DNS hijacking.
Router DNS Hijacking
Most home and small business routers ship with default credentials that many users never change. Attackers exploit these defaults to gain access to the router’s admin panel and modify its DNS settings. Once the router’s DNS is changed, every device connected to that network is affected — computers, phones, smart TVs, and IoT devices alike.
Man-in-the-Middle (MitM) DNS Attack
In a MitM attack, the attacker positions themselves between the user and the DNS server. They intercept outgoing DNS queries and return fraudulent IP addresses pointing to malicious servers. This type of attack is often used to target high-value individuals, corporations, or government networks.
Rogue DNS Server Attack
The attacker gains administrative access to a legitimate DNS server and modifies its records. This affects all users whose devices query that server — potentially thousands or millions of people — and redirects them to attacker-controlled destinations.
DNS Spoofing (Cache Poisoning)
In DNS cache poisoning, the attacker injects fraudulent DNS records into a resolver’s cache. When users query that resolver for a legitimate domain, they receive the malicious IP address instead of the correct one. For example, a query for “bankname.com” returns an IP address pointing to a convincing phishing replica of the bank’s website.
How to Detect DNS Hijacking?
Signs that DNS may have been hijacked include:
- Browser redirects to unexpected websites when typing familiar URLs
- SSL certificate warnings on sites you normally trust
- DNS lookup results that differ from what authoritative tools like nslookup or dig return
- Router admin panel showing unfamiliar DNS server addresses
- Antivirus alerts about DNS-modifying malware
- Login credentials being accepted on what appears to be a legitimate site, followed by unauthorized account access
If you suspect DNS hijacking at an organizational level, run DNS query logs through a threat intelligence platform to identify queries being directed to unauthorized servers. For a professional investigation, a cyber crime investigation unit or qualified investigator can conduct a full DNS forensics review.
How to Fix DNS Hijacking?
Step 1: Scan All Devices for Malware
Run a full system scan using a reputable anti-malware tool on every device connected to your network. Look specifically for DNS-modifying trojans and remove any detected threats before making other configuration changes — otherwise the malware may re-apply its settings.
Step 2: Reset Your Router to Factory Settings
Access your router’s admin panel and perform a factory reset. This clears any DNS changes made by attackers who gained router access. After resetting, create a strong, unique admin password — never leave the default credentials in place.
Step 3: Change DNS Server Addresses to Trusted Providers
Configure your router and devices to use well-known, security-hardened DNS providers. Options include Google Public DNS (8.8.8.8 / 8.8.4.4), Cloudflare (1.1.1.1 / 1.0.0.1), or Quad9 (9.9.9.9). These providers implement security filtering and maintain high availability.
Step 4: Enable DNSSEC on Your Domain
DNSSEC (Domain Name System Security Extensions) adds digital signatures to DNS records, allowing resolvers to verify that the DNS response they receive has not been tampered with in transit. To enable DNSSEC, log into your domain registrar, enable DNSSEC in the DNS settings, and ensure your hosting provider supports it. This protects users from cache poisoning attacks targeting your domain.
Step 5: Implement DNS Cache Locking
DNS cache locking prevents cached DNS entries from being overwritten during the cache TTL (time-to-live) period. On Windows DNS servers, configure cache locking at 100% to ensure cached records cannot be replaced by poisoned responses until the TTL expires. This is set via the registry or PowerShell on Windows Server.
Step 6: Monitor DNS Traffic Continuously
Set up DNS query logging and alerting to detect unusual patterns — such as a sudden increase in NXDOMAIN responses, queries to unusual TLDs, or DNS tunneling (data exfiltration via DNS). Many organizations use DNS security services or SIEM platforms to automate this monitoring.
How to Prevent DNS Hijacking Long-Term?
- Use DNS over HTTPS (DoH) or DNS over TLS (DoT) to encrypt DNS queries, preventing interception by network-level attackers.
- Change default router credentials immediately on any new device and enable two-factor authentication on router admin panels where supported.
- Keep router firmware updated — manufacturers regularly patch vulnerabilities that attackers use to gain router access.
- Segment your network — separate IoT devices from computers and servers so that a compromised router on one segment cannot affect all devices.
- Conduct regular DNS audits — verify that your domain’s DNS records match what you have configured at your registrar and hosting provider.
When Should You Engage a Professional to Fix DNS Hijacking?
Individual users may be able to self-remediate a DNS hijacking incident by following the steps above. Organizations, however, should engage a qualified cyber security expert when DNS hijacking affects business operations, when customer data may have been intercepted, or when the attack vector is unclear and requires forensic investigation.
A professional can conduct a complete DNS forensic audit, trace the attack origin, preserve evidence for legal proceedings, and implement enterprise-grade DNS security controls. Contact us to discuss your DNS security requirements.
What Is the Relationship Between DNS Hijacking and Phishing?
DNS hijacking is one of the most effective enablers of phishing attacks because it operates at the infrastructure level rather than relying on users clicking malicious links. A victim can type a trusted URL directly into their browser, have their DNS query intercepted, and land on a pixel-perfect replica of a legitimate site — all without any suspicious email or link involved.
This makes DNS-based phishing harder to detect and more dangerous than traditional vishing or email spoofing attacks. It is one reason why DNS security is treated as a foundational layer in any serious cybersecurity strategy.
