In the digital age, the security of the internet is crucial for both individual users and businesses. The Domain Name System (DNS), as one of the infrastructures of the internet, is responsible for converting human-friendly domain names into machine-understandable IP addresses. However, DNS hijacking, a form of cyber-attack, poses a serious threat to our online experience and information security.

What does it mean when a webpage’s DNS is hijacked?

DNS hijacking, also known as DNS redirection, is a type of cyber-attack where attackers manipulate the results of DNS queries, causing users to inadvertently visit malicious websites. This type of attack can lead to the leakage of user information, infection with malware, or being subjected to phishing attacks, among other serious consequences.

In the case of DNS hijacking, even if users enter the correct website address, they may be redirected to a completely different site that may contain malicious content. This not only affects the user’s online experience but may also lead to the leakage of user privacy and financial loss.

Specific Manifestations of DNS Hijacking

  • Web pages pop up with a large number of irrelevant ads.
  • Websites automatically redirect to other unrelated or malicious sites.
  • Internet connection speeds slow down, or some sites may become inaccessible.
  • Online shopping or payment sessions are redirected to counterfeit websites, increasing the risk of personal information theft.

How to Detect DNS Hijacking?

Detecting DNS hijacking is not easy, but the following signs may indicate that DNS has been hijacked:

  • Check the network configuration; if the DNS server address has been changed to an unknown server address, it is very likely the result of DNS hijacking.
  • Use online DNS detection tools, such as the DNSChanger Check-Up, to help determine if you have become a victim of DNS hijacking.
  • Compare the speed of access and website content; if there are sudden anomalies, be vigilant.

Methods to Thoroughly Resolve DNS Hijacking

Although there is no way to completely resolve DNS hijacking, there are several methods that can significantly reduce its likelihood. Here are some effective solutions:

  1. Use a secure DNS server – Choose a trustworthy DNS service provider, such as Google Public DNS or OpenDNS, which often provide additional security features to resist DNS hijacking.
  2. Encrypt DNS queries – Using encrypted protocols like DNS over HTTPS (DoH) or DNS over TLS (DoT) can protect DNS queries from interception and tampering.
  3. Update and maintain network devices – Regularly update router firmware, use complex administrative passwords, and turn off unnecessary remote management functions to reduce the risk of exploitation by hackers.
  4. Install firewalls and security software – Installing firewalls and security software on devices can help monitor and block malicious traffic, promptly identifying and dealing with security threats.
  5. Intelligent DNS resolution services – Adopt intelligent DNS resolution services that can perform smart resolutions based on the user’s source IP address segment, ensuring optimal resolution results for the user and reducing the occurrence of DNS hijacking.