What is a Trojan Virus?


Don’t become stuck with a trojan virus! Read this article and stay informed.

trojan virus, also known as a trojan horse, is a serious type of computer virus. A trojan virus is designed to download, install, and hide other viruses from anti virus programs. This allows viruses to run rampant on your system without your knowledge!

The above description is a basic rundown of trojan viruses, but it doesn’t go into detail on the process of the virus itself. To fully understand the malware, we must ask ourselves the question: What is a Trojan Virus?

What is a Trojan Virus: History of the Trojan Virus

The term “trojan” dates all the way back to the Trojan War. The Greek army offered the Trojan army a large wooden horse as a peace offering. However, unbeknownst to the Trojan Army, the wooden horse was filled with Greek soldiers. As soon as the Trojans allowed the horse into the city, the Greeks emerged and overtook the city.

A Trojan Virus is very much the same thing. As a user downloads a malicious program, the trojan virus uses security loopholes in the Windows operating system to set itself up, often displaying a fake error message stating that the program is corrupted or does not work. After the user runs the program, installs malware that hides itself in the Windows filesystem. From there, the user’s computer is completely vulnerable to anything the creator of the trojan virus wishes. He can install keylogger software that tracks your keyboard’s input and steals personal information such as credit cards, social security numbers, and private files on the victim’s computer. Additionally, he can “sell” your computer to other hackers who wish for their malicious software to be installed. The trojan virus market is very large, and infected computers are high in demand!

What is a Trojan Virus: What can a Trojan Virus Install?

Trojan Viruses can install many types of malware on your computer. Below is a list of common viruses that stem from trojan viruses:

  • AdWare – AdWare is a common component of a trojan virus. Aimed at making the creator money off of ad revenue, trojan viruses install AdWare to display advertisements on your computer. This includes pop-ups and other unwanted advertisements that can be placed anywhere on Windows.
  • Keyloggers – A trojan virus is not a trojan virus unless it comes bundled with some type of keylogger. Keyloggers can track the input of your keyboard and steal personal information such as credit card numbers and passwords. These are commonly found in trojan viruses.
  • Rootkits – Mentioned before, rootkits hide trojans and other viruses from both Windows and antivirus programs. These can be very dangerous, and their removal, along with the removal of the trojan virus itself, can cause Windows to not run correctly.
  • Worms – A trojan virus can sometimes install a computer worm. These special viruses attach themselves to any and all files on the victom’s computer. When a file is transfered to another computer, it can then spread to that computer. Worms are becoming less and less common with trojan viruses, but they still are being made, and they can produce devastating effects.

What is a Trojan Virus: How do I remove a Trojan Virus?

Removing a trojan virus is no easy task. The virus is so deeply rooted into the Windows filesystem that it can block Windows from even seeing the file. You see, Windows runs on a “kernel,” or a basic set of operations that provide functionality to the rest of the system. A trojan virus can hook into the Windows kernel and prevent data being sent back to the front end of windows, effectively making the trojan invisible. However, being able to do this in the first place is extremely difficult to do. Despite this, hackers have created separate malware programs such as rootkits to make this process much easier.

To remove a trojan virus, users should use the built-in trojan and rootkit scanner that comes with Kaspersky Anti-Virus 2015. Kaspersky is the leading antivirus company, and their trojan virus scanner is unparalleled in today’s market. Additionally, Kaspersky offers a boot disc that runs separately from Windows, making it impossible for the trojan virus to hide.

What is a Trojan Virus: How can I prevent a Trojan Virus?

Prevention is key when it comes to protecting your computer. In order to prevent a trojan virus from infecting your computer, be sure to follow the steps below:

  • Always download files from a trusted website – Check the URL of the website you are downloading files from to ensure that it is a trustworthy site.
  • Scan files before opening them – Once the damage is done, it is very difficult to repair. Thus, users should always run a virus scan on any file they download. Luckily, Kaspersky Anti-Virus 2015 does this automatically, and it will alert you if it finds a problem.
  • Beware of Phishing Emails – If you receive an email from an unknown sender and it contains a link or attachment, it is very likely to be a trojan virus or some other kind of virus. Because of this, discard any untrusted emails that you may receive.
  • Keep Java Up-To-Date – Java was recently updated to fix a security loophole that allowed attackers to install a trojan virus on unexpecting users. To prevent this from happening in the future, be sure to update Java frequently.

Now you can answer the question yourself: What is a Trojan Virus? Trojan Viruses are deadly, and they can cause your computer to completely fail if left on your system for too long. Be weary of what you download, and stay safe!

What is a Trojan Virus: Resources

For more information on “What is a Trojan Virus?” please refer to the following resources:

  • What is a Trojan Virus: http://en.wikipedia.org/wiki/Trojan_horse_%28computing%29
  • Kaspersky Labs (Trojan Virus Explaination): http://usa.kaspersky.com/internet-security-center/threats/trojans