Deeper dive into how DNS works

How to remove the DNS Changer malware

Every Internet service provider operates their own DNS servers. That's not a problem unless the service provider's DNS servers become unavailable. At that point, your Mac won't be able to load any websites. Fortunately, there are other companies out there that offer free DNS servers that you can use with your Mac.

DNS changer malware: how to detect it and protect yourself

Many of these services are faster, and some companies have never experienced a service interruption. Plus, some DNS providers offer additional services for free, like malware protection and parental controls. There are dozens of free DNS servers out there. How do you know which ones to use?


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We'll make it easy for you. Google's service "never blocks, filters, or redirects users," which is great for users who just want the unfiltered Internet in all of its glory. OpenDNS prevents you from accessing webpages that are known to host malware that could harm your Mac.

What is DNS

Plus, if you register for a free OpenDNS account, you can use parental controls to restrict access to adult content and other Internet nasties. Here's how:. A former ghost writer for some of Apple's most notable instructors, Cone founded Macinstruct in , a site with OS X tutorials that boasts hundreds of thousands of unique visitors per month.

How to Change DNS Server Settings in Mac OS X

You can email him at: So, Al Varnell, a helper on both the ClamXav and Apple Support Communities forums, was instrumental in helping to put together a manual removal guide. I could not have done this without his assistance! Enter your admin password when asked be aware nothing will be displayed when you type , and Terminal will then display any cron tasks for the root user. Typically this will be blank. Finally, you need to change your DNS server settings.


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How this is done varies depending on the version of Mac OS X you are running. Remove any servers from the list using the [-] button at the bottom of the list, and then replace them with the OpenDNS servers Then click OK. Enter one address, then press return to go to the next line and enter the second address. Then click Apply Now. Neither Al nor I believe that to be necessary. Since neither the forum hosts nor other forum users had responded publicly, Wardle decided to do some investigating. DNS stands for domain name system, a technology used by nearly every Internet-connected device to resolve domain names to their actual Internet protocol IP address.

For example, if you type "intego. It also installs a malicious root certificate authority root CA so that secure HTTPS requests can also be hijacked by the malware without scary warnings appearing in the victim's browsers.

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The combination of hijacking DNS and injecting a root CA make it possible for the malware creator to engage in "man-in-the-middle" MitM attacks against a victim. An attacker could potentially do things such as spy on everything a victim does online, see every bit of data typed into "secure" Web forms, and inject malware or advertisements into any Web page even if the page uses HTTPS.

Although analysis of the malware so far has not shown any utilization of the following functions, the malware also appears to have the capability or at least incomplete attempts at adding the capability to execute AppleScript code, simulate mouse clicks, and take screenshots. Thanks to Thomas Reed for working with the forum user to obtain this information.


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How to change DNS settings in OSX