Nerds On Call: July 9th FBI Pulls Plug on Infected PC's

Redding, California (PRWEB) July 06, 2012

On Monday, July 9th, the FBI will pull the plug on internet access to hundreds of thousands of computers infected with a malware Trojan known as DNSChanger. Even if your computer is clean, companies that have compromised systems in their network will be taken offline, hindering their ability to do business and possibly breaking their websites, in what many are referring to as Internet Doomsday.

In November 2011, the FBI (together with international cyber crime agencies) identified and located a ring of cyber criminals that had infected more than four million computers across the world with a Trojan virus known as DNSChanger. According to the FBIs webpage about this malware (, DNSChanger was used to redirect unsuspecting users to rogue servers controlled by the cyber thieves, allowing them to manipulate users web activity.

Systems infected with DNSChanger were ultimately controlled by the crime ring that perpetrated the infections. The Trojan re-directed unsuspecting users to fraudulent websites which in many cases resulted in users providing personal information or credit card numbers to websites they thought were legitimate. It interfered with web browsing and in some cases prevented infected PCs from downloading anti-virus and operating system updates, leaving them vulnerable to viruses and spyware.

Once the rogue DNS servers were found and seized, the FBI faced a daunting challenge. Take them offline and millions of systems would lose all access to the internet causing widespread damage to online commerce and business functionality. Instead, they set up temporary replacement servers which allowed infected computers to remain functioning in the hopes that users would clean the Trojan off their system before the temporary servers go offline on July 9th.

To a certain extent, this plan worked. According to DNSChanger Working Group, or DCWG (, the number of infected systems has declined from over 4 million to just over 300,000 worldwide. However, since the DCWG measures infections by IP addresses and not individual systems, the number could be higher. Brian Krebs of Krebs on Security ( states in his blog, Because many systems that are on the same local network often share the same IP address, the actual number of DNSChanger-infected machines is probably quite a bit higher than 300,000. In May, Google used cookies on infected machines to estimate that the number is more than 500,000.

Perhaps more troublesome, a report by IID (Internet Identity) indicates that machines at 12% of Fortune 500 companies and 4% of government agencies are still infected with the malware ( When their systems are taken offline on the 9th it will lead to loss of productivity and may make it harder to service their customers.

Facebook and Google are sending notices to users that browse to their sites from a DNSChanger-infected computer. However, even if you havent been notified of an infection you shouldnt breathe a sigh of relief and consider yourself in the free and clear.

When the FBI disables the temporary servers it will break infected systems access to the internet but it will not remove the malware from those systems. Take a few minutes to ensure that youre not kicked offline on July 9th.

First, open your internet browser and go to If your system is infected youll see a red image with the words DNS Resolution = RED. Alternatively, a green image with DNS Resolution = GREEN means that your computer is looking up IP addresses correctly.

Unfortunately, a green isnt necessarily an all clear either. Some internet service providers have created their own mini-DNSChanger servers which allow infected systems to bypass the FBI servers to access the internet. This means that while you wont lose access to the internet on the 9th you may still be infected.

Next, if you dont have a reputable antivirus software program installed on your system, get one. I like Microsoft Security Essentials ( because it scans for and protects against malware and viruses in one step. The DCWGs website,, also offers a list of links to download software to rid your system of the Trojan.

Finally, make sure your anti-virus is up to date. Youd be surprised how many users cripple their anti-virus by not downloading updates regularly. Once its up-to-date, run a scan to make sure youre DNSChanger free before finding out the hard way.

About The Author

Andrea Eldridge is CEO and co-founder of Nerds On Call, an on-site computer and laptop repair service for consumers and businesses. Andrea is the writer of two weekly columns, Computer Nerds On Call a nationally syndicated column for Scripps-Howard News Service, and Nerd Chick Adventures in The Record Searchlight. She regularly appears on ABC, CBS, FOX, NBC, The CW, and CNN on shows such as Good Day Sacramento, Good Morning Arizona and MORE Good Day Portland, offering viewers easy tips on technology, Internet lifestyle, and gadgets. Andrea recently has begun working with Demand Media to produce content for and has written a book for them Smartphone 101: Integrating Your iPhone Into a Windows World. Andrea is available for Q & As, expert tech quotes and will appear on your show, call today! See Andrea in action at

About Nerds On Call

Established in a spare room in Redding, Calif., in March 2004, Nerds On Call offers on-site computer and laptop repair services to consumers and businesses. Nerds On Call provides trouble-shooting for PCs and Macs, home and office networks, printers, iPods? and MP3 players, handheld devices and cell phones, home theaters and game systems, and virtually every other form of digital entertainment. In 2009, 2010, & 2011 the company was named to Inc. magazines list of 5000 fastest growing private companies. With 15 locations across California, Oregon, Washington, & Arizona Nerds On Call serves more than 40,000 satisfied customers per year. For more information, visit or call 1-800-919-NERD.