Trojan Horse Injector

Contents of this article pertain to Trojan Horse Injector . This page includes description, technical aspects, and removal guide to delete the threat from your computer.

Trojan Horse Injector is a generic detection for variants of Trojan that injects a malicious code on web files. This threat may possess payload to alter web site’s layout and to infect visitor’s computer with the injected codes. Since this is a typical detection process for different types, symptoms and effects may vary from one infection to another. Although, one common indication for an infected computer is alert messages originating from installed antivirus program stating compromised .php, .htm, and .html files.

Damage Level: Medium

Systems Affected: Windows 9x, 2000, XP, Windows Vista

Trojan Horse Injector does not self-replicate once it infects a computer. It was designed to exploit security vulnerabilities and perform malicious actions on the system. This Trojan is capable of concealing itself from legitimate security applications and connects regularly to a remote host to download additional threats.

If Trojan Horse Injector able to update itself through remote connections, it can be more harmful and prevalent causing damages to installed anti-virus software. Remote attacker may also gain unauthorized access on affected machine though a backdoor port.

The Trojan’s activity requires high CPU usage that slows down overall system performance. It also reduces Internet bandwidth with successive connections to remote servers.

Propagation of Trojan Horse Injector may vary from different variants. Most common of all is through an infected web site that employs a drive-by-download method that instantly infects visitor’s computer by exploiting Internet browser’s vulnerability. Once inside the system, the virus targets .HTM, .HTML and .PHP files to run the Trojan when these files are opened.

How to Remove Trojan Horse Injector

Systematic procedures to get rid of the threat are presented on this section. Make sure to scan the computer with suggested tools and scanners.

NOTE: We suggest that you PRINT or BOOKMARK this guide. There are steps that we may have to restart the computer in order to successfully remove the threat.

Step 1 : Run a scan with your antivirus program

1. First thing you should do is reboot the computer in Safe Mode with Networking to avoid Trojan Horse Injector from loading at start-up.

Remove all media such as Memory Card, cd, dvd, and USB devices. Then, restart the computer and please do the following:

Boot in Safe Mode on Windows XP, Windows Vista, and Windows 7 system
a) Before Windows begins to load, press F8 on your keyboard.
b) It will display the Advanced Boot Options menu. Select Safe Mode.

Start computer in Safe Mode using Windows 8 and Windows 10
a) Close any running programs on your computer.
b) Get ready to Start Windows. On your keyboard, Press and Hold Shift key and then, click on Restart button.
c) It will prompt you with options, please click on Troubleshoot icon.
d) Under Troubleshoot window, select Advanced Options.
e) On next window, click on Startup Settings icon.
f) Lastly, click on Restart button on subsequent window.
g) When Windows restarts, present startup options with numbers 1 - 9. Select "Enable Safe Mode with Networking" or number 5.

Startup Options

h) Windows will now boot on Safe Mode with Networking. Proceed with virus scan as the next step.

2. Once Windows is running under Safe Mode with Networking, open your antivirus program and download the most recent update. This method ensures that your antivirus program can detect even newer variants of Trojan Horse Injector.

Updating your antivirus software is a one-click process. Please refer to your software manual for complete instructions.

3. Once updating is finished, run a full system scan. After the scan, delete all infected items. If unable to clean or delete, better place the threat in quarantine.

Step 2: Run another test with online virus scanner

Another way to remove Trojan Horse Injector without the need to install additional antivirus software is to perform a thorough scan with free online virus scanner. It can be found on websites of legitimate antivirus and security provider.

1. Click the button below to proceed to the list of suggested Online Virus Scanner. Choose your desired provider. You can run each scan individually, one at a time, to ensure that all threats will be removed from the computer. This may require plug-ins, add-on or Activex object, please install if you want to proceed with scan.

Online Virus Scan

2. After completing the necessary download, your system is now ready to scan and remove Trojan Horse Injector and other kinds of threats.
3. Select an option in which you can thoroughly scan the computer to make sure that it will find and delete entirely all infections not detected on previous scan.
4. Remove or delete all detected items.
5. When scanning is finished, you may now restart the computer in normal mode.

Alternative Removal Procedures for Trojan Horse Injector

Option 1 : Use Windows System Restore to return Windows to previous state

During an infection, Trojan Horse Injector drops various files and registry entries. The threat intentionally hides system files by setting options in the registry. With these rigid changes, the best solution is to return Windows to previous working state is through System Restore.

To verify if System Restore is active on your computer, please follow the instructions below to access this feature.

Access System Restore on Windows XP, Windows Vista, and Windows 7

a) Go to Start Menu, then under 'Run' or 'Search Program and Files' field, type rstrui.
b) Then, press Enter on the keyboard to open System Restore Settings.


Open System Restore on Windows 8 and Windows 10

a) Hover your mouse cursor to the lower left corner of the screen and wait for the Start icon to appear.
b) Right-click on the icon and select Run from the list. This will open a Run dialog box.
c) Type rstrui on the 'Open' field and click on OK to initiate the command.


If previous restore point is saved, you may proceed with Windows System Restore. Click here to see the full procedure.


About Marco Mathew

Marco Mathew works as Windows Network administrator before establishing Now, Marco is dedicating full-time to help computer users' fight viruses, malware, trojan, worms, adware, and potentially unwanted programs.


  1. AvatarKimberkarrier

    Only one problem with this fix….my trojan infection disabled both AVG and Malwarebytes… It appears to have completely disabled all control of programs, including IE8, AVG, Malwarebytes, Control Panel, Task Manager, etc, etc, etc… Cant even flash the bios evidently because the software for that is disabled as soon as it put into the drive. My machine doesnt support boot from USB, but it doesnt matter anyways because the USB is disabled just like the internet, and rom drives…. Any ideas for that?!?!

  2. AvatarJake brewer

    thats why you scan as an external drive

  3. Avatarleroi

    try renaming the anti-viral software

  4. AvatarDave

    If you use F5 or F8 on boot and run in safe mode you should be able to sort it.

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