Dude - A virus ate my customer's internet connection!

Did you think that viruses were a thing of the past that you don't have to worry about any more? Well here is a story from one of our customers that shows that the Internet really can be a dangerous place even for the most security conscious companies. Understandably, businesses focus on making money rather than IT security. The problem is that when you get a malware infection (which many of you will understand better as viruses), you may not know about it, but that doesn’t mean that they can’t cause problems for your company.

Recently, one of our largest customers was having problems with a web security system that they had bought about a year ago. They have around 2,000 IT users and a sizable internet connection, but something was bringing their system to a grinding halt, and quite a lot of the web connections had very little to do with their line of business!

Since they have a support contract with us we held our hands up to do some investigation as to what was causing the problem, and it soon became obvious that 75% of their network traffic was coming from a single PC which had obviously been infected with malware and was generating huge amounts of network traffic which was clogging up their Internet connection.

The graphs below show you what happened as soon as the infected PC was removed from the network. It’s amazing what one infected PC can do!:

Web connections per hour dropped from 20,000 to 5000.

Blocked connections per hour dropped from 14,000 to 0.

Connections per hour to “malicious” sites dropped from 20,000 to 0.

We will never know how the malware ended up on our client’s PC. They were probably just unlucky and visited a hacked web site that took advantage of a missing security update to infect the PC. What it does demonstrate though is the importance of making sure that your PC’s are kept updated to minimise the likelihood of picking up a malware infection. 

Just imagine the devastating effect that a similar incident could have on your company if you rely on cloud services for your line of business applications. It just goes to show that as you grow more and more reliant on the Internet to run our businesses, you will need to make sure that your security is up to scratch.