Safeguards against Modem Hijacking

The issue of modem hijacking has affected a number of Internet users in Ireland. This section addresses the related issues:

What are dialler programs?

A number of websites use dialler programs as an alternative payment method to credit cards. It is a way of charging the consumer through their normal telephone bill - similar to other premium rate services. If you access websites offering content in this way you will be requested to download a piece of software known as an Internet dialler. This software will change the settings of the modem connecting your computer and telephone line. The use of dialler programs has generally been linked to webservers located outside Ireland and which use high cost destinations for access.

Why is there a problem with dialler programs?

The problem arises where consumers are not aware that they have downloaded a dialler program or are unaware of what the dialler program does. Rogue sites may not make clear that you are installing software on your computer or that the dial up settings for your Internet access will be permanently changed. They may even mute the volume of your modem in order to hide the fact that the modem has disconnected from your normal ISP and is re-dialling a different number.

Essentially these providers are hijacking your modem settings. While you may or may not become aware of the dialler programme while accessing the Internet, it frequently happens that consumers only realise the implications when they receive a telephone bill with high call charges to international or premium rate numbers.

Typical signs of Modem Hijacking

You can hear your modem disconnect and dial-up again
Your internet speed becomes significantly slower than usual. There may be other reasons for this, but when checking always start by looking at your dial-up settings and properties,
If you receive an unexpectedly high telephone bill, which lists unknown and high-cost international telephone numbers,
An unfamiliar short-cut icon appears on your desktop,
If you are on line and cannot send e-mails

Measures you can take to address the issue

It is important that consumers are aware that this issue exists and exercise vigilance when accessing the Internet. In particular:

Regularly view your Internet settings and check the telephone number your computer is dialling to connect to the Internet. For most Irish ISPs the telephone number will start with 189x.,
Be cautious when clicking on pop-up boxes (extra windows that appear). If in doubt about accessing the content always click "No" or use the Escape key to close the window,
Exercise similar caution if you are redirected to an unexpected web page,
Turn up the volume on your modem so you can hear whether your modem has disconnected and is attempting to re-dial,
Remove any connections or icons on your desktop that are unfamiliar. You will need to uninstall the underlying programs - simply deleting the icons will not be sufficient,
Turn off your computer and modem when not in use,
Set up password protection for access to your computer and the Internet,
You could bar access to premium rate or international numbers but consult your telecom supplier about making voice calls,
Install protective software and update it regularly. Your ISP should have recommended software solutions to help deal with the problem,
Consult your ISP's help pages or their technical support for specific information or assistance in implementing solutions.

What should I do if I am affected by a dialler program?

When you receive your telephone bill you should contact your service provider who, in some cases, may refund a proportion of the charges to you. However, you should not unduly delay the settling of the bill as this may impact on your service.

Other Information on Computer Security

The Department of Communications, Marine and Natural Resources has developed an official website dedicated to the National Awareness campaign on Computer security (click the following link to view) www.makeitsecure.ie Pop up to new window

On this website, you will find some useful tips on how to make your computer a safer place, both in the workplace and at home. You will find information about some basic issues relating to computer security.