Backdoor:PHP/Dirtelti.B is a dangerous Trojan specifically designed to alter some Windows system files. The Trojan also opens a backdoor port on the infected computer, which can allow a remote hacker to carry out malicious actions. Backdoor:PHP/Dirtelti.B can infect the computer by exploiting system and software vulnerabilities by executing a malicious PHP script from local or web URL.

Leaving this virus operating on the computer could root to more chaos. The handlers of Backdoor:PHP/Dirtelti.B can control the computer from a remote location and carry out different malicious actions. Therefore, immediate clean-up is advised by scanning the computer with effective antivirus or anti-malware program.

Illustration for Backdoor:PHP/Dirtelti.B

How does it infect the computer?

Backdoor:PHP/Dirtelti.B enters the computer due to another Trojan infection. It can also be downloaded and executed manually by a user while visiting infected websites.

When inside the computer, Backdoor:PHP/Dirtelti.B will place a copy of itself in the System folder of Windows OS, assigning a random file name. Then, this virus will inject malware code in the “explorer.exe” file to perform its functions on the affected system. The virus will register as a service to ensure automatic execution when Windows begins by modifying the registry.

This Trojan also modifies the Windows system but will save a copy of the untouched version. Both files can be located under the same directory.

How does this malware operate?

Backdoor:PHP/Dirtelti.B will create a backdoor, which will enable the remote attacker to perform the following procedures:

  • Theft of system information such as operating system version, computer name, username and password.
  • Connect to a foreign server to download and run more malware.
  • Take an image of the compromised computer screen.
  • Communicate with a remote computer and keep up-to-date.
  • Reboot a PC after implementing an update.


A system alert coming from an antivirus program is one visible sign that users may witness if the computer is infected with Backdoor:PHP/Dirtelti.B. In addition, there will also be some software crashes that often leads to computer malfunctions.

Versions of Backdoor:PHP/Dirtelti.B
Version Name Alert Level Date Added
Backdoor:PHP/Dirtelti.W1!MTB Severe Aug 05, 2020
Backdoor:Java/Dirtelti!rfn Severe Feb 10, 2021

How to remove Backdoor:PHP/Dirtelti.B?

To totally remove Backdoor:PHP/Dirtelti.B from the computer and get rid of relevant viruses and trojans, please execute the procedures as stated on this page. Make sure that you have completely scanned the system with the suggested malware removal tools and virus scanners.

Step 1 : Scan the PC with Combo Cleaner for Windows

Combo Cleaner is a trusted computer security and optimization tool equipped with a powerful virus and malware detection engine. This program can get rid of computer virus like Backdoor:PHP/Dirtelti.B through this procedure.

1. Download the application from the following page:

2. Save the file to your preferred location.

3. Double-click the downloaded file CCSetup.exe and install with the default settings.

4. At the end of the setup process, click Finish to run Combo Cleaner.

5. The tool will update the database file; please wait for this process to complete.

6. To begin checking for threats like Backdoor:PHP/Dirtelti.B, click on the Start Scan button. Wait for this scan to finish.

Screenshot of Combo Cleaner PC

7. At the end of the scan process, click on Remove all threats to delete Backdoor:PHP/Dirtelti.B malware, including all malicious objects from the computer.

To fully optimize the features of antivirus and privacy scanners, users may have to upgrade to the premium version.

Please continue with the succeeding removal procedures if you are comfortable manually getting rid of the computer virus and malicious items linked to it.

Step 2 : Start Windows in Safe Mode With Networking

The method of running Windows in Safe Mode before running a virus scan is effective in getting rid of Backdoor:PHP/Dirtelti.B. This process can prevent most viruses and malware from loading, making it easier to detect and remove them.

1. On the Windows Search bar, please type msconfig.

Screenshot of Win 11 Search

2. Select and open System Configutation on the list of found results.

3. Once you are in the System Configuration window, go to the Boot tab.

Screenshot of Msconfig Win 11

4. Under the Boot Options area, please check Safe Boot so that it starts in Safe Mode after restarting.

5. Next, select Network. This will allow Windows to boot in Safe Mode with Networking.

6. Lastly, click on Apply and OK to save the changes.

7. Please restart Windows.

Do not forget to restore the normal boot process of Windows after running the virus scan. Simply repeat the method above, and this time, uncheck the Safe Boot option to run Windows normally.

Step 3 : Run Sophos Home Virus Scanner

To remove Backdoor:PHP/Dirtelti.B automatically, scanning the computer with this powerful virus and malware removal tool is recommended. This scanner does not just uncover known threats like viruses or malware; it is also effective in discovering harmful files associated to Backdoor:PHP/Dirtelti.B.

1. Please click on the link below to download the program.

2. After downloading, locate the file SophosInstall.exe in the Downloads folder.

3. Install by double-clicking on the file.

4. If it prompts "Do you want to allow this app to make changes on your device?" please click Yes.

5. Next, it will display the Terms and Conditions page. Click the Install button to begin.

Screenshot of Terms by Sophos Home

6. Run the installation with the default settings. Please note that an internet connection is required in order to download important updates.

7. After finishing the installation, you must login to the dashboard. If you already have a Sophos account, please login. Otherwise, please enter your details and click on the Create Account button.

8. Once you are in the Sophos Home console, click the Scan button to start checking the computer for Backdoor:PHP/Dirtelti.B components.

Screenshot of Sophos Home

9. Scanning may take a while; please wait for this process to finish.

10. After scanning the computer, Sophos Home will start cleaning or deleting files infected with Backdoor:PHP/Dirtelti.B.

11. You may now close Sophos Home. The computer is now free from Backdoor:PHP/Dirtelti.B, as well as associated malware and viruses.

After executing the above instructions, Backdoor:PHP/Dirtelti.B should have been completely removed from the computer. If there are still signs of infection or the computer is displaying unusual behaviors, please continue with the remaining procedures.

Another alternative for Windows 10/11 users is to scan the computer with Microsoft Defender Offline. This will run a virus scan in the recovery environment.

Step 4 : Double Check with Windows Security Apps

Microsoft Windows has a built-in security application that you can use to double-check if your computer is still infected with Backdoor:PHP/Dirtelti.B. For Windows 10/11 users, please run Windows Security.

Windows 10 / 11 Instructions:

Windows Security is a free tool that was built to help you remove Backdoor:PHP/Dirtelti.B, viruses, and other malicious items from Windows 10/11 systems. Follow these procedures to scan your computer with the tool:

1. Tap or click the Search charm and search for Windows Security

2. Click Open to run the program.

Screenshot of Win 11 Search

3. On the Dashboard, click Virus and threat protection from the sidebar.

Screenshot of Win 11 Virus Protection

4. On the right panel, click on Scan Options to see different levels of checking the computer.

5. Next, please select Full Scan button.

Screenshot of Full Scan Win 11

6. Lastly, click on the Scan now button to start scanning for the presence of Backdoor:PHP/Dirtelti.B. The process may take a while to complete.

7. After the scan, Delete/Quarantine identified threats, whether they were relevant to Backdoor:PHP/Dirtelti.B or not. You may now restart Windows to complete the virus removal process.

For Windows 8.1 and Windows 7, you can scan the computer for free with the Microsoft Malicious Software Removal Tool (MSRT 64-Bit). It is a stand-alone virus scanner tool that targets prevalent malware groups.

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1 thought on “Backdoor:PHP/Dirtelti.B”

  1. I seemed to have this dirtelli (active) together with some other PHP shells. Windows 11 showed me the active threads in a notification. Now it all seems to be gone. I’m not too sure how to proceed

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