After this command is run, next run the following command on each of the listed names be sure to remove any asterisks from in front of the names, and ensure the names are in quotes if there are any spaces in them :.
On a Windows machine including any of those you may have installed in a virtual machine , you can open the command-line tool select "Run" from the Start menu and enter "cmd," or in Windows 7 select "All Programs" and then choose the command line from the Accessories folder. In the command line, run the following command to list all network interface information, including configured DNS server IP addresses:. In addition to manually looking up and checking your DNS settings, a number of Web services have popped up that will test your system for the DNSChanger malware.
If these tests come up clean, then you have nothing to worry about; however, if they give you any warnings, then you can use an anti-malware scanner to check for and remove the DNSChanger malware. Given that the malware was abruptly halted in November , there's been ample time for security companies to update their anti-malware definitions to include all variants of DNSChanger.
If you have a malware scanner and have not used it recently, then be sure to launch and update it fully, followed by performing a full scan of your system. If your router or computer is not showing any valid DNS server addresses after you have removed the malware, and your system is unable to connect to Internet services, then you might try configuring your system to use a public DNS service, such as those from OpenDNS and Google, by entering the following IP addresses into your system's network settings:.
If after Monday you find you can no longer access the Internet, then it's likely your system or network router is still configured with the rogue DNS servers and you will need to again attempt to detect and remove the malware from your systems.
Luckily the malware is not viral in nature so it will not self-propagate and automatically re-infect systems. Therefore, once removed and once users have set up valid DNS servers on their systems, then the affected computers should have proper access to the Internet. Since DNS is the interface between the typed URL and the targeted server, the crime ring created its own DNS network that would in large part work normally, but would also allow the ring to arbitrarily redirect the traffic for specific URLs to fake Web sites for the purposes of stealing personal information or getting people to click on ads.
Setting up the rogue DNS network itself isn't enough, since this network needs to be specified in a computer's settings in order to be used.
To make this happen, the crime ring created the DNSChanger malware also referred to as RSplug, Puper, and Jahlav , which was distributed as a trojan horse and successfully infected millions of PC systems worldwide.
Once installed, this malware would continuously change the DNS settings for the affected computer and even for network routers , to point to the crime ring's rogue DNS network. As a result, even if people manually changed their computers' DNS settings, these changes would automatically be reverted by the malware on their systems.
Since millions of PC users had been infected by this malware, once the crime ring was taken down in a November multilateral sting called Operation Ghost Click , the FBI and other government authorities decided against turning off the rogue DNS network as this would have instantly prevented the infected systems from resolving URLs, and thereby would have effectively shut down the Internet for them.
Instead, the DNS network was kept active and converted to a legitimate service while efforts were put in place to notify users of the DNSChanger malware and wait for the number of worldwide infections to fall.
Is it possible to verify that it does not configured to use malicious DNS servers? Is it possible to do that just by performing some analysis with DNS queries from inside local network? DNSChanger works be forcing you to use a DNS server managed by a malicious party, which thus can reply to your DNS queries with the wrong answers containing IP addresses in the control of the attacker.
This way your systems connects to a different and attacker controlled system than you've intended and allows the attacker to hijack and man-in-the-middle your traffic. To find out if your router is infected you thus need to find out what DNS server the router is using and compare it to your expectations. If you don't have access to the routers configuration you can use the help of some external service, which lets you visit a unique domain in control of the service and then shows you from where the DNS query for this domain came.
An external site which provides such service is Router Checker service offered by F-Secure. Note that this shows you the DNS server used by your browser. While this is the the DNS server provided by your router in most cases it does not need to be. Or you might have configured your system to use a different DNS server then the one provided by the router. This might have been done by manually, by using some privacy enhancing software or also by malware. In these cases this method will not show you if your router is infected since it does not use the DNS server offered by the router.
But it shows you at least if connections done by your browser would have been hijacked, no matter if done by your router or somewhere else. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?
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