What is a Trojan?

Trojan takes its name from the classic story of the Trojan horse because it imitates the technique of infecting computers.

So what is the Trojan named after the Trojan horse's story?

Trojan is a type of malware that looks like something useful or fun to people, but actually causes harm or theft of data. Trojan virus usually silently downloads other malware (spyware, adware, ransomware) to an infected device. One of the most dangerous Trojan viruses is Zeus.

Trojan Virus


The purpose of the Trojan virus is to control a user's endpoint, steal data and inject more malware into the victim's computer. It can also:

  • Deleting data from endpoints
  • Copying data of endpoints
  • Preventing data from entering endpoints
  • Change the data of endpoints
  • Disrupting the performance of computers or computer networks


What Are the Harms of the Trojan?

Damage caused by a Trojan virus infecting a home computer or corporate network can result in complete network failure or critical data loss. The scale of the damage depends on the targets of the virus, and sometimes the results of the action are not perceptible to users.

So what damages does the Trojan do? Let's examine the answer to this question step by step:


1. Creating back doors

Provides remote access to malicious users through the infected computer. They can do anything they want to send, receive, initialize and delete files, view data, and restart the endpoint.


2. Espionage

The Trojan virus can spy on how you use your computer by monitoring data you enter through your keyboard, taking screenshots or taking a list of running applications.


3. Taking your computer

The Trojan virus allows hackers to take control of the victim's computer, take pictures using webcams, disable the mouse, keyboard, and even restart the computer.


4. Send High-Paid SMS messages

The Trojan virus can use the SMS (text) messaging services of a mobile device to send and block messages and send high-cost SMS messages from your smartphone to private numbers. The user is generally unaware of the behavior.


Types of Trojans

We have examined the damages of the Trojan virus step by step above. Now it's time for Trojan virus types:

1. Backdoor Trojan

As the name suggests, it can create a "backdoor" on your computer and trick users into clicking on malicious links or even accessing malware on a website.


2. Exploit-Trojan

It contains data or code that exploits a vulnerability in application software running on your endpoint.


3. Rootkit-Trojan

These are designed to hide certain objects or activities on your system. This can effectively prevent malicious programs from being detected.


4. Trojan-Banker

Its purpose is to steal your account data for online banking systems, e-payment systems, credit or debit cards.


5. Trojan DdoS

By initiating DoS attacks, Tis Trojan can infect not only endpoints but also websites. It can send multiple requests from your computer and several other infected computers, overloading the destination address, leading to a denial of service.


6. Trojan-Downloader

Trojan-Downloader can download and install new versions of malicious programs on your computer, including Trojans and adware.


7. Trojan-Dropper

Trojan-Dropper is used to install Trojans and other viruses on the computer, it can also hide the detection of malicious programs. If you are using a weak or outdated antivirus, some cannot scan all the components inside this type of trojan horse virus .


8. Trojan-GameThief

If you enjoy playing games, you know that you can make a lot of money online gaming. Cybercriminals use the Trojan-GameThief virus to steal user account information from online players.


9. Trojan-Ransom

This can cause endpoint failure as Trojan-Ransom can alter the data on your endpoint. In such a case, cybercriminals will ask for ransom from you. It only changes the performance of your computer or unblocks your data after you pay.


How to Avoid Trojan Virus?

If you are concerned about how to stay safe from Trojan viruses, follow these tips:

  • Use your antivirus software
  • Make sure your antivirus program is always updated
  • Avoid malicious websites
  • Never click on attachments and malicious links from unknown emails
  • Use strong passwords for your personal protection
  • Always use a firewall to keep your personal information safe


How to Detect a Trojan?

Below you will find the answer to the question "How to detect a Trojan?" In the list we have prepared for you. If you have any of these on your computer, your computer is probably infected with a trojan virus.

  • Slow computer
  • Blue screen error
  • Strangely opening windows
  • Unfamiliar plugins
  • Applications that behave strangely
  • Disabled security application
  • Insufficient memory
  • Uncontrolled desktop change
  • Being redirected to unfamiliar websites
  • Strange icons on the taskbar
  • Lost files
  • Receiving spam


How to Remove Trojan from Computer?

Your computer has a firewall to fight the Trojan virus and learn how to remove it from your computer. You can also clean Trojans by installing antivirus software on your computer . But these softwares are not always effective for automatically removing the trojan virus from the computer. In this case, you have to remove the Trojan virus manually.

The steps you can follow to do the Trojan removal manually are as follows:

1. Identify infected files

Whenever you notice some strange things on your computer, see if you have a download that you think might be suspicious. Once a file is infected with a Trojan virus, it becomes fairly easy to remove.


2. Stop system restore

If you skip this step, the files you deleted will be restored.


3. Restart your computer

Choose "Safe Mode" when restarting your computer.


4. Add or remove programs

You will find this in your control panel. Then remove infected programs.


5. Remove extensions

To delete all files for a program, you must remove them from the system folder.


After completing the steps below to remove the Trojan horse virus from your computer, you must restart your system in normal mode.


How to Clean Phone-Contaminated Trojans?

If you own an Android device, you've probably heard of some security legends. Like most Android users, you probably download your apps from the Google Play Store and you'll see a checkmark that indicates the apps are being scanned by Google Play Protect, Google's built-in malware detection engine.


Google has devoted many resources to detecting Trojans and other types of malware. But Play Protect alone isn't enough to prevent Trojans from endangering your device.


Consider the example of Android.Spy.277.origin, a piece of spyware packaged as a Trojan horse virus . Android.Spy.277.origin is distributed through fake versions of popular antivirus apps that have passed Google Play Protect.


Cybersecurity researchers at Malwarebytes (developers of one of the best Android antiviruses) recently discovered a trojan that embeds itself in a QR code app, a photo editor, and an internet connection speed tester.


When this is the case, then you may be wondering how do I clean the Trojan that infested my phone. Whether you're looking for comprehensive trojan protection or suspecting your phone is already infected, the following tools will make your system work as well as new.


1. Norton Mobile Security

Norton Mobile Security is one of the solutions that will give you peace of mind that your system is clean. It offers multi-device protection, lost or stolen device recovery, and more.


2. Malwarebytes

Malwarebytes actively documents Android Trojans that infect the Google Play Store. Malware Mobile Security provides advanced protection against malware, ransomware, spyware and more.


3. AVG

AVG can extract Trojans with one of the most powerful malware detection engines on the market. Especially the Android application is very well designed.


Remember, Google Play Protect has allowed multiple trojan horse viruses to pass through so far . So you can download one of the above tools to ensure security.


Best Trojan Removal Programs

If you're using a computer, I'm sure many of you have experienced the blue screen once or twice. A blue screen doesn't necessarily mean you have a Trojan on your computer, but you should check the situation.


If you don't want to be one of those who experience blue screen, you can find below list of best Trojan Removal programs:

  • System Mechanic Ultimate Defense
  • Advanced System Protector
  • Malwarebytes
  • Advanced SystemCare
  • Bitdefender Antivirus
  • Sucuri
  • AVG
  • Norton Power Eraser
  • Avast Internet Security
  • HitmanPro
  • Emsisoft
  • Trend Micro
  • Comodo
  • Microsoft Malicious Software Removal Tool

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