Trojan Horse Injector

17 June 2009 4 Comments

Trojan Horse Injector is a generic detection for a variants of Trojan that injects a malicious code on web files. Trojan Horse Injector may possess payload to alter web site’s layout and to infect visitor’s computer with the injected codes.

Damage Level: Medium

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

Characteristics
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.

Distribution
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

1. Temporarily Disable System Restore (Windows Me/XP). [how to]
2. Open your antivirus application and update the virus definition file. This method ensures that your antivirus program can detect even newer variants of Trojan Horse Injector

3. Start Windows in Safe Mode with Networking.
- From a power-off state, turn on the computer and press F8 on your keyboard repeatedly.
- Your computer will display Windows Advanced Boot Options menu. Please select Safe Mode with Networking.
- The system will now boot Windows and loads only necessary drivers and files.

4. Open your antivirus program and run a full system scan. After the scan, delete all infected items. If unable, better place them in quarantine. Once the scan is complete, please proceed with the next step.

Online Virus Scanner:

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

5. Go to Online Virus Scanner list and run a virus scan. This may require plug-ins, add-on or Activex object, please install if you want to proceed with scan.
6. After completing the necessary download, your system is now ready for online virus scanning.
7. 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.
8. Remove or delete all detected items.
9. When scanning is finished, you may now restart the computer in normal mode.

Automatic Removal of Trojan Horse Injector

In order to completely remove the threat, it is best to download and run Malwarebytes Anti-Malware. Sometimes, Trojans will block the downloading and installation of MBAM. If this happens, download it from a clean computer and rename the executable file before executing on the infected machine.