Final DNSChanger warning

It’s here, folks! If the replaced DNSChanger servers don’t get another deadline extension, more than 500,000* computers may not be able to reach their configured DNS service after next Monday, July 9, 2012.  In other words, it will be practically impossible for the users of those computers to surf the Internet using human friendly domain names like That’s right, many of the systems that were infected by DNSChanger still have the DNS (Domain Name Service) settings that were altered by the malware, even when the malware itself has been removed.

DNSchanger stops Internet access

So, what exactly is DNSChanger?

If you have no idea what I am talking about, take a quick peek at one of our previously published posts:


Which countries had the most infections?

Courtesy of


How can you find out whether your system was affected?

Several web sites have been set up to provide a check-up service and additional information on the threat, such as or


How can you recover from it?

The malware can be completely removed from your computer using our free ESET Online Scanner and the system DNS can be re-set to use – for example – the Google Public DNS.


* Please, note that this number is an estimate and it is reflecting the fact that some IP addresses may be used by many systems.


Peter Stancik
Security Evangelist


Author , ESET

  • Stephen Cobb

    Thanks for a timely update Peter! I have to say that I prefer the EU site you mention for checking DNSChanger because it has a privacy disclosure.

    One aspect of DNSChanger that is causing problems for some people is the corruption of Wi-fi access points and home routers. As you know, it is possible to remove the infection from a PC but still have the wrong DNS settings in your acess point, although I don't have any statistics on how common this is.

    One site that readers may find useful for access point DNS change information is provided by OpenDNS. People who find that their access point has been affected can use these instructions to reset their DNS to OpenDNS or Google Public DNS as you suggest. 

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