What to do about DNSChanger

July 6, 2012

It’s a long, long story. It starts with the arrest in November 2011 of six Estonian cybercriminals who managed to infect millions of computers with malicious software known as DNSChanger.

This malware would compromise search results, direct infected PCs to rogue websites, compromise antivirus software and insert rogue advertisements into legitimate pages. These guys made a load of money before they were nabbed.

However, even after the arrests, plenty of computers remained infected. The FBI set up temporary servers for infected PCs, but those will be coming down on July 9, 2012. In other words, if your computer or router is infected, you won’t be able to connect to the Internet, starting Monday.

(“Five Years” by David Bowie just popped into my head, but in this case, you’ve got about three days.)

The first thing you need to do is check to see of your machine is infected. The DNSChanger Working Group provides a list of sites that check your computer here. If it says you’re good to go, no additional action is required.

However, if you get a red light, you’ll have to fix your computer. The DCWG provides instructions here, along with links to tools that specifically remove the malware, but you may need to take your PC to a professional computer repair shop.

I’ve heard that about 70,000 computers are still infected (this one’s clean!), so it’s not as if the entire Internet is going to die on Monday (as some of the jumpier news sources have implied), but you still don’t want to find yourself unable to connect and cut off from solutions to the infection.


How to make sure you’ve got the latest version of Java (Windows users)

July 6, 2012

According to the excellent website Krebs on Security, a new Java exploit is set to go completely mushroom cloud on computers worldwide with outdated Java installations within the next few days.

The BlackHole Exploit Kit is used by cybercriminals for purposes various and nefarious, and is currently the most common web threat around. However, we won’t go into too much detail here about the malware itself. Instead, let’s talk about how to keep your Windows-based computer safe.

The first thing you need to do is find out if you have Java installed on your computer at all, and which version you’ve got. The easiest way to accomplish this task is to visit java.com and click the “Do I hava Java?” link. This takes you to a page with a big “Verify Java version” button:

Click the button and the site will tell you if you’ve got the recommended version of Java installed, which currently (as of July 6, 2012) is either Version 6 update 33, or Version 7 update 5. If it tells you to update, follow the on-screen instructions.

(If your computer is set up like mine, your web browser will ask you for permission to run the Java content on this page. At this point, you’ll know you’ve got it installed, but you still need to verify which version you’ve got. Click the “Run this time” button when prompted, and it will let you know if you have the recommended version.)

What if the site says you don’t have Java installed? Should you install it?

Naturally, the java.com website will suggest you do, but if you’ve been using your computer without it so far, I’d recommend not installing it at all. Java is currently the most popular channel through which exploits like the BlackHole pack are used, and new security holes are discovered all the time. If you’ve come this far without Java, there’s really no good reason to install it.

If you’ve got Java installed and want to keep it (there are still some websites that rely on it), make sure you’ve got the software set to check for updates at least once a week, but I recommend taking it a step further and checking daily. Here’s how.

1. Click the “Start” button, then select “Control Panel.”

2. Find the “Java” icon in the Control Panel window and double-click it.

3. Click the “Update” tab, then the “Advanced” version.

4. Select “Daily” and check what time of day it will check. I left mine on 11:00 PM. Click “OK.”

5. Click “Apply” and “OK.” You’re done!

Note: if the updater detects that a new version of Java is available, most of the time you’ll have to manually install the update. Your computer will prompt you when it’s time.


The “Slow Computer” Scam

September 28, 2011

Does your computer seem to be running slower lately?

You’re not alone. Over time, computers tend to get bogged down. For example, you install a piece of software to accomplish some task you only perform every now and then, but the program requires that a component of itself be running in the background at all times. Or you upgrade your antivirus software—the new version does a better job of filtering out malicious software, but it also needs more system resources to do its job.

Perception also plays a role—the “new” wears off a computer pretty quickly, and what seemed like blinding speed a year ago now feels like you’re trudging through treacle every time you want to fire up a web browser, even if the machine is running just fine.

The net result is that a lot of people think, “Hey, this thing isn’t running as fast as it used to—something must be wrong!” Enter the Slow Computer Scam. It generally targets seniors, but anyone with a computer could fall for it.

It begins with a phone call from a stranger who claims to work for Microsoft. The caller tells the victim that the company has received notification that their computer has been running slowly or is infected with spyware, viruses or other problems.

At this point, if the victim agrees, the call will go one of two directions. In the first variant, the victim is instructed to go to their computer, then fed step-by-step directions by the caller that are supposed to fix the problem. What is actually happening is the victim is handing over control of their computer to a criminal, allowing them to search for files containing personal information, install spyware designed to harvest any data the victim enters, or link the computer to a botnet used to transmit data for organized criminals.

In the second version, the victim will be told that the caller can fix the problem, but only for a fee. They will be instructed to use Western Union to wire a few hundred dollars as payment.

There is a recent double-dip version in which the scammers call the same victim again a few weeks later. This time, they inform the victim that they are from Dell (or whoever manufactured the victims computer), the earlier call from Microsoft was a scam, and that their computer was infected with malware by the scammer. They offer to fix the computer for a fee of several hundred dollars, again to be wired via Western Union.

This may be one of the easiest scams to recognize. If your telephone rings, and someone is on the line telling you that there’s something wrong with your computer, that’s your cue to hang up.

Microsoft does not have a giant control room that keeps tabs on the performance of every computer in the world. Nobody is sitting at a monitor going, “Whoa. Some guy out in Indiana has a slow computer. Perkins! Get on this!”

The same goes for Dell and other computer hardware manufacturers—they don’t have a giant database of who owns their computers or how they’re running. If there’s a problem with your hardware or software, or if your machine is infected with malware, it’s basically on you to figure it out and fix it.

There is also no scenario in which Microsoft, Dell, or any other tech company is ever going to require payment via Western Union. Keep your antivirus software up-to-date, and when a stranger calls to tell you there’s a problem with your computer, hang up.


Link: Krebs’s 3 Basic Rules for Online Safety

May 20, 2011

I usually only like to create my own content around here because my ego is just that huge. Seriously; I had to buy a different car than the one I wanted last summer because my head wouldn’t fit in a Focus.

I kid.

Anyway, sometimes somebody else just sums it up so perfectly, it’s better to just let them say it.

With that in mind, please give Krebs’s 3 Basic Rules for Online Safety a read right now. It won’t take you five minutes to read, but it lays out three principles that could save you a lot of headaches down the road.

In fact, if you’ve got a few sites you regularly read, I’d recommend adding Krebs on Security to that list.


Having a dedicated computer for online banking

November 4, 2010
Clipart of bills and coins

Image via Wikipedia

Here’s a great idea that doesn’t get talked about enough: having a computer you use only for online banking and other financial activities, and a different computer for games, music and general Internet usage.

It seems like an expensive route to have two separate computers, but think about it—your financial machine only has to be just powerful enough to handle an operating system, an Internet connection and a web browser. You don’t need massive amounts of RAM or a great (or even particularly good) video card. You could probably even find a used laptop running Windows XP (if you’re a PC user; however I would not recommend Windows Vista) if you poke around. Install your antivirus software and Mozilla Firefox with the NoScript plugin, and you’re ready to go. I would also recommend setting up a separate email address for anything related to finances, and only check it with your financial computer.

What this does is keeps your financial activities separate from everything else; you’re not likely to encounter malware by logging in to your credit card providers or financial institution’s website. In the meantime, if you run into malware trouble on your “fun” computer while mucking about on the Intertubes, the damage will be limited. Your banking passwords won’t get snagged by a keylogger you picked up on an infected website, even if your Facebook password does.

Of course, buying a separate computer is going to cost money whether you go new or used, and in any case you have to keep your security software up-to-date on both machines. It’s not an option for everyone. However, if you can swing a few hundred bucks for a dedicated banking computer and some good security software, it’s just one more layer of protection.


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