How to Check Trojan in Computer?

Updated on October 21, 2022, by Xcitium

Does your computer show weird signs lately? Is your computer is suddenly having a life of its own, executing tasks without your permission? Do you know how to check Trojan in computer? You might have downloaded a Trojan.

You can compare the Trojan horse to a spy who poses as a friend to you. It can suck the life out of your business or even your entire bank account. It’s built to send out information and exploit everything you have. When the cybercriminals receive your information, they can sell your information to the black market or transfer your money to their bank accounts.

Unlike a virus, a Trojan needs a user’s permission to operate. You have to click the “run” button and it’ll start to inflict damage to your computer. It will surely show signs that scream “Trojan.” You have to look for these signs and it can teach you how to check the Trojan in computer.

# 1: Weird Messages and Pop-ups

Do you notice that your computer is showing you all sorts of pop-ups and messages? It doesn’t matter if it’s an advertisement or a message saying your PC is infected. You can be sure now that you are seeing evidence of a Trojan. You may have contracted a fake antivirus or a spyware onto your system.

# 2: Extremely Slow Computer

If you think that having too many files and running multiple applications all the same time can slow down the computer, it’s not the only cause. A computer Trojan can also cause that slowness because it is using processing power and memory.

# 3: You Can’t Connect to the Internet

One of the signs you have a Trojan in your computer is a slow Internet. Many times, you might not be able to connect to it either. When you know that everyone else in the house or office can connect, be warned. That’s one of the symptoms of a Trojan horse virus. When you already have it on your computer, the rojan could be connecting to a URL or opening separate connection sessions. Because of that, it decreases the available bandwidth or it makes it hopeless to connect to the Internet.

#4: Apps aren’t Working at All

An application you really need isn’t working at all after minor troubleshooting must be an effect of a Trojan. Some programs can work but some of your programs won’t. You should go check all of your security tools and system to be sure.

#5: Malicious Windows

Are there unwanted windows and browsers that display pages when you look at the screen? This is a strong indication of a Trojan horse virus. The unwanted redirection of traffic to another deceitful website. This can trick you to use a fake website which you won’t notice at all.

#6: Incomprehensible Language

Your computer language suddenly changes without you changing it? It’s a giveaway Trojan sign. Your screen can also show back-to-front and other strange activities can tell you that you have an infected computer system.

# 7: Your Antivirus Gone and Firewall Disabled

It’s not only files that can disappear in your computer, your antivirus and firewall functions can be turned off during a Trojan horse virus attack. This makes your computer a lot more vulnerable to cyber attacks. A serious computer security issue is already happening by this time.

# 8: Are Your Files Missing?

This is one of the scariest Trojan horse virus signs. The Trojan virus manipulates your missing important files. The Trojan horse can delete or encrypt information, or move your files to another place. You should be worried when this thing happens to you.

How to Check Trojan in Computer

To check for a Trojan virus on your computer:

1. Run a full system scan using trusted antivirus software
2. Check Task Manager for unknown processes
3. Monitor unusual system behavior (slow performance, pop-ups)
4. Review installed programs for suspicious apps
5. Check startup programs for unauthorized entries
6. Scan network activity for unusual connections
7. Use anti-malware tools for deep scanning

Step-by-Step: How to Detect a Trojan Virus

1. Run a Full Antivirus Scan

Use a reliable antivirus like Xcitium, Windows Defender, or Malwarebytes.

• Perform a full system scan (not quick scan)
• Quarantine or remove detected threats

2. Check Task Manager for Suspicious Processes

• Press Ctrl + Shift + Esc
• Look for:
  • Unknown processes
  • High CPU or memory usage
• Search suspicious process names online

3. Look for Unusual Computer Behavior

Common Trojan symptoms include:

• Slow system performance
• Unexpected pop-ups
• Programs opening automatically
• Browser redirects

4. Review Installed Programs

• Go to Control Panel → Programs → Installed Programs
• Remove:
  • Unknown software
  • Recently installed suspicious apps

5. Check Startup Programs

• Open Task Manager → Startup tab
• Disable unknown entries

6. Monitor Network Activity

• Open Command Prompt → type: netstat -ano
• Look for:
  • Unknown IP connections
  • Suspicious background activity

7. Use Advanced Anti-Malware Tools

Run specialized tools for deeper detection:

• Anti-malware scanners
• Endpoint security solutions
• Behavioral analysis tools

Signs Your Computer Has a Trojan

FAQ

How do I know if I have a Trojan virus?

You may have a Trojan if your computer shows unusual behavior such as slow performance, unknown programs, frequent crashes, or unauthorized network activity. Running a full antivirus scan can confirm infection.

Can Windows Defender detect Trojans?

Yes, Windows Defender can detect many Trojans, but advanced threats may require additional anti-malware tools or endpoint security solutions for complete protection.

How do I remove a Trojan virus?

To remove a Trojan:

1. Run a full antivirus scan
2. Delete suspicious files/programs
3. Use anti-malware tools
4. Restart in Safe Mode if needed

Are Trojans dangerous?

Yes, Trojans can steal sensitive data, monitor user activity, and give attackers remote access to your system.

Summary

We understand that businesses need more protection because you have more stakeholders. You take care of your employees, customers, and connections. A stronger software protection layer can save you from headaches.

In Xcitium, we offer the Advanced Endpoint protection to many businesses to improve their endpoint security even more. Xcitium Advanced Endpoint Protection provides a lightweight, scalable Default Deny Platform with a unique endpoint security approach, which results in complete protection and enterprise visibility. The app-based platform eliminates complexity and solution overlap. Provisioned in minutes, Advanced Endpoint Protection also includes unified IT and security management console, that through an app-enabled platform reduces the effort of managing your Android, iOS, OSX, Linux, and Windows devices, on every segment of your physical and virtual networks.

How to check Trojan in Computer? This is the easiest way. Visit our website for more details.

Related Sources:

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