What should I do if DNS hijacking is abnormal? Detailed explanation of common causes and handling methods

in the process of daily Internet access, many people have encountered clearly enter the correct URL but jump to unfamiliar advertising pages, or frequent pop-up irrelevant pop-ups, these abnormalities are often related to DNS hijacking abnormalities. DNS, as the conversion bridge between domain names and Internet Protocol Addresses, once hijacking abnormalities occur, it will not only affect the Internet experience, but also may bring risks such as information leakage and property damage. This article will deeply analyze the common causes of DNS hijacking abnormalities, and give targeted treatment methods to help you quickly identify and solve such network problems.

How to determine whether there is a DNS hijacking exception?

to solve the abnormal problem of DNS hijacking, we must first accurately determine whether we have encountered such a situation to avoid confusion with ordinary network failures.

1, URL jump abnormal

enter the correct domain name of a commonly used website, it does not jump to the expected page, but enters an unfamiliar website containing a lot of advertisements and misinformation. This situation is one of the most typical manifestations of DNS hijacking abnormalities. For example, enter the domain name of an e-commerce platform, but jump to a counterfeit phishing website.

2, pop-up ads frequently appear

in the case of not visiting advertising websites, the browser suddenly pops up a large number of irrelevant pop-ups, and even frequently pushes advertising information in the lower right corner of the desktop, and cannot be effectively blocked by conventional pop-up window blocking tools, which may also be caused by abnormal DNS hijacking.

3, domain name resolution results abnormal

can query the resolution IP of commonly used domain names through the command prompt of the computer or the network diagnostic tool of the mobile phone. If the Internet Protocol Address queried does not match the IP officially announced by the website, it can be determined that there is a DNS hijacking abnormality.

What are the common causes of abnormal DNS hijacking?

understand the causes of DNS hijacking abnormalities, can help us prevent and solve the problem from the root cause, different incentives corresponding to the treatment method is also different.

1, the router has been maliciously tampered with

home router is the hardest hit area of DNS hijacking. Many users set the router password too simple, or do not update the router firmware for a long time. Hackers can invade the router through vulnerabilities and tamper with the built-in DNS server address to achieve hijacking. In addition, some inferior routers themselves have security bugs, which will also give hijackers an opportunity.

2 Public WiFi is a security risk

connect to free WiFi in public places such as shopping malls and cafes, it is also prone to DNS hijacking abnormalities. Some criminals will build counterfeit public WiFi, and when users connect, they will forcibly tamper with the user's DNS resolution path and guide users to malicious websites to obtain traffic or steal information.

3 Device infected with malicious software

computer or mobile phone accidentally downloaded software with malicious plug-ins and opened phishing email attachments, it may be infected with malicious software, which will quietly modify the DNS settings of the device, resulting in abnormal DNS hijacking. Some malicious software will also hide itself, and it is difficult for ordinary antivirus software to quickly detect and clear.

How to deal with DNS hijacking exception?

once it is confirmed that DNS hijacking is abnormal, it is necessary to take timely measures to deal with it to avoid further expansion of the problem.

1, manually modify the device DNS settings

can switch the DNS server address of the device to public DNS, such as domestic 114.114.114.114, Ali's 223.5.5.5, or international 8.8.8.8. Take the Windows system as an example, open the Network and Sharing Center, find the currently connected network, enter the attribute settings, double-click Internet Protocol version 4, manually enter the public DNS address, and restart the device after modification to verify whether the DNS hijacking abnormality is solved.

2, reset router and strengthen protection

suspected that the router is tampered with DNS hijacking abnormality, you can reset the router through the reset button on the back of the router, then reset the complex administrator password, and timely update the latest firmware of the router. You can also turn on the DNS filtering function in the router settings to intercept malicious resolution requests.

3, kill device malicious software

use professional antivirus software to comprehensively kill the device. If the conventional antivirus software cannot be cleared, the malicious software killing tool provided by the security vendor can be used. After the killing is completed, check whether the DNS settings of the device are restored. If not, manually modify it to public DNS to completely solve the abnormal problem of DNS hijacking.

4. How to prevent DNS hijacking abnormalities from happening again?

solve the abnormality of DNS hijacking, doing a good job of prevention can effectively reduce the probability of re-encounter and safeguard cyber security.

1, setting complex network password

router administrator password to avoid the use of birthday, mobile phone number and other simple combinations, it is best to use letters plus numbers plus special symbols of the complex combination, while regularly changing the password. Device lock screen password, WiFi connection password should also be set to be more complex, not hijackers can take advantage of the opportunity to reduce the abnormal occurrence of DNS hijacking from the source.

2, carefully connect public WiFi

try to avoid connecting to unfamiliar public WiFi without passwords. If you must connect, you can use the official public WiFi service provided by the mobile phone operator, or use the VPN to encrypt the network connection to prevent the DNS resolution path from being tampered with. In the public WiFi environment, do not perform sensitive operations such as online banking transfer and password modification.

3, regularly update equipment and software

timely update the system version of the computer, mobile phone, as well as router firmware, antivirus software, etc. These updates often fix known security bugs, improve the defense ability of the device, and reduce the risk of DNS hijacking abnormalities caused by malicious software intrusion. At the same time, only download software from official channels to avoid installing programs from unknown sources.

To sum up, DNS hijacking abnormality is a common cyber security problem, and the incentives cover router vulnerabilities, public WiFi risks, malicious software intrusion and other aspects. When encountering such problems, first judge accurately through the characteristics of URL jump, analysis results, etc., and then take methods such as modifying DNS settings, resetting routers, and killing malicious software according to specific incentives. Daily password management, careful connection to public WiFi, and regular device updates are also required to effectively avoid DNS hijacking abnormalities and ensure the safety and smoothness of network access.