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What is a Trojan Virus?

When you get a Trojan Horse Virus you may well ask yourself the questions: What is it? Where did I get it from? How do I get rid of it? In Greek mythology, soldiers hid in a large horse at the gates of Troy, creeping out later that night and killing the Trojans while they slept. Trojan Horse viruses certainly aren't myth and might well already be in your computer. Do you know what to do if you have them?

What Is A Trojan Virus?

A Trojan horse is a program that carries out undocumented functions your computer has not asked for. Things that the user (you) would never have authorised had they known about it.

Essentially all viruses have elements of being a Trojan Horse. However Trojans by definition perform something malicious or exert deliberate damage. A virus though is commonly referred to as a Trojan when it happens to be a non-replicating malicious program. Which means that any program not doing you damage is in fact not a Trojan.

A Trojan Horse Virus might perform some sort of mining function, searching for and lifting particular information, it could be financial or personal. Or it might attach itself to your email and send out unsolicited mail to your contacts.

Here are some of many nuggets of delight that Trojan viruses can inflict upon you:

  • perform harmless pranks like displaying messages
  • steal passwords or financial details
  • erase data
  • track keystrokes
  • steal enough data to impersonate you.

Where Do I Get Trojan Viruses From?

There are plenty of websites that appear perfectly harmless and offer some free programs which might well be instructive and useful, even entertaining, but have viruses attached to them. This is especially true with file-sharing websites.

Often websites and files containing free wallpapers or cool applications target children. They are often downloaded without a second thought and often without your knowledge.

Further to this you may get junk emails which contain attachments which you knowingly or unwittingly open and which contain viruses.

Perhaps it has already happened and YOU are the one currently sending out junk emails to friends, contacts or people around the world.

How Do I Know If I Have A Trojan Horse Virus?

You may have already downloaded a Trojan Horse without even knowing it. Is your computer doing any of the following?

  • Web browser’s default homepage changes
  • You receive the error: “Internet Explorer could not display the page” when attempting to access some websites
  • Web browser freezes or is unresponsive
  • Your computer runs slower than usual
  • New toolbars appear
  • You get redirected to web pages you don't recognise
  • You receive numerous popups, that often manifest as tabs in your browser. Frustrating and obnoxious!
  • There are new icons on your desktop that you don't recognize
  • Your computer restarts by itself
  • You see unusual error messages.

How Do I get Rid Of Trojan Horse Viruses?

Running your antivirus scan should help detect and remove it. But sometimes it might already have infected your computer and executed its malicious task. At which point, if you can find out what it has actually done and where the malicious file actually is, you might be able to go into your registry or system settings and remove it.

However, if you are unsure of what this involves - and one false move can render further damage to your computer - then you can always call us for advice and practical help whether you have a virus or just lost data. Call us on 0161 941 2525 for all your PC care and repair advice.

By | December 15, 2015 | Computer/IT Support | 0 Comments

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