Exorcise Ghost Click from Your PC

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Yeah, I know: you just can’t get enough news about Herman Cain, Joe Paterno, and that aircraft carrier-sized asteroidthat just went whizzing by our planet. But you may have missed a story that is in many ways more important: Operation Ghost Click.

Earlier this week the FBI and international law authorities took down the biggest criminal botnet yet – some 4 million zombie PCs, all controlled by a band of Estonian cyber thieves doing business as an allegedly legitimate company called Rove Digital (no relation to Karl).

Rove performed all kinds of digital malfeasance -- including the sale of fake antivirus software, distribution of malware, replacing legitimate ads on Web sites with their own, and generating fake clicks to pull in ad revenue – while pretending to be a real IT firm.

They did it by distributing malware that took over the Domain Name System (DNS) settings on PCs and network routers. DNS servers translate URLs (like www.itworld.com) into IP addresses (like that can be read by Internet routers. Change the DNS table to match a legit URL with an illegitimate IP address, and you can do all kinds of nasty things to the computers that visit that Web site.

To maximize their reach, Rove hijacked popular sites like iTunes, Netflix, and IRS.gov. The FBI estimates they made at least $14 million through these deeds. But that’s only the money they could find. The actual proceeds are likely an order of magnitude higher.

The Feds estimate that 500,000 of the zombie PCs were located in the US, affecting everyone from individuals to government agencies like NASA.

(I’m pretty sure that at one time I had a computer that was infected with this particular type of malware, known as DNS-Changer. I used to get some insanely strange redirects – like typing Facebook.com into my browser and getting sent to Yahoo instead. Fortunately, that machine has since passed onto the great digital boneyard in the sky.)

How do you know if your machine is one of them? TrendMicro, which aided the FBI in its investigation and had been tracking the activities of Rove and its assorted subsidiaries for more than five years, offers some tips in its CounterMeasures blog.

First, you’ll need to determine the IP address of your DNS server. And yes, it affects Macs as well as Windows machines, so Apple fanboys should pay heed as well. Per TrendMicro’s Rik Ferguson:

On a PC, open the Start menu by clicking the Start button or the Windows icon in the lower left of your screen, in the Search box type “cmd” and hit return (for Windows 95 users, select “Start“, then “Run“).This should open a black window with white text. In this window type “ipconfig /all” and hit return. Look for the entry that reads “DNS Servers” and note down the numeric addresses that are listed there.

On a Mac …click on the Apple icon in the top left of your screen and select “System Preferences“, from the Preferences panel select the “Network” icon. Once this window opens, select the currently active network connection on the left column and over on the right select the DNS tab. note down the addresses of the DNS servers that your computer is configured to use.

You’ll then need to plug that IP address into the FBI’s online database of compromised DNS settings to find out if yours is among them. If it was (unlucky you) the Feds would like you to fill out a victim’s report. You’ll then need to do a virus scan to find and destroy the malware, then contact your ISP to restore the correct DNS settings.

You can do a quick (and free) online virus scan at Trend Micro’s HouseCall service or PC Pitstop.

For my money, keeping cyber criminals out of my PC (and my life) is more important than who’s running for president or coaching Penn State. As for Asteroid Armageddon? Well, maybe not.

Got a question about social media? TY4NS blogger Dan Tynan may have the answer (and if not, he’ll make something up). Visit his snarky, occasionally NSFW blog eSarcasm or follow him on Twitter: @tynan ontech. For the latest IT news, analysis and how-to’s, follow ITworld on Twitter and Facebook.

This story, "Exorcise Ghost Click from Your PC" was originally published by ITworld.

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