Remove Win32/Delf.NRJ Trojan Totally from Your PC - How to, Technology and PC Security Forum | SensorsTechForum.com
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Remove Win32/Delf.NRJ Trojan Totally from Your PC

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Win32/Delf.NRJ is a Trojan horse written in the Delphi programming language. The Trojan opens a backdoor on a compromised computer and may steal data, perform DDoS attacks or run executable files.

NameWin32/Delf.NRJ
TypeTrojan, Backdoor
Short DescriptionThe Trojan opens a backdoor. The backdoor can give unauthorized, remote access to a computer to a hacker.
SymptomsThrough the backdoor, a hacker may steal data, may perform Denial of Service attacks or run executables.
Distribution MethodTargeted Attacks, Email Attachments
Detection ToolDownload Malware Removal Tool, to See If Your System Has Been Affected by Win32/Delf.NRJ
User Experience Join our forum to discuss Win32/Delf.NRJ.

Win32/Delf.NRJ Trojan – Distribution Methods

One method of getting infected with the Win32/Delf.NRJ Trojan horse is by installing it manually as software pretending to be useful. So, without knowing, you are getting the Trojan injected into your computer, instead. Another distribution method spreading the infection is via browser exploits, such as plugins, extensions, or suspicious sites with malicious code inside them.

You may get infected with the Trojan from a targeted attack by downloading an attachment from an email. Files that can be used to distribute Trojans like Win32/Delf.NRJ, usually have these extensions: .bat, .exe, .vbs, .pif, .scr.

Win32/Delf.NRJ Trojan – In Detail

Win32/Delf.NRJ is classified as a Trojan horse. It is written in the Delphi programming language. It has the potential to infect your computer with more malware as it opens a backdoor on it. From that backdoor, a hacker gains access from a remote location.

According to researchers, once the Trojan is executed it starts searching for .exe files and when it finds any such files, it begins renaming them. It usually puts the letter G in front of those files:

STF-win32-delf-mrx-grenam-files
Image Source: Microsoft

After these operations, the Trojan will modify Windows Firewall settings, and connect remotely to a URL address. It uses the UDP, HTTP protocol to do so.

Via that backdoor, the Win32/Delf.NRJ Trojan may perform a number of malicious actions. Actions such as: moving, reading, executing, downloading, creating, deleting, and copying files; enumerating running processes. The Trojan can also perform DDoS attacks, open specific URLs in your browsers and also run various executable files which might contain malicious code.

The Win32/Delf.NRJ Trojan is dubbed like that by ESET researchers, and the name has gained popularity. But it also has the following other aliases:

  • Backdoor.Win32.Delf.mrx (dubbed by Kaspersky)
  • W32/Renamer-K (dubbed by Sophos)
  • Backdoor.Win32/Grenam.A (dubbed by Microsoft)

Via the connection to the remote locations, the hacker behind the Trojan may also steal sensitive data and files.

Remove Win32/Delf.NRJ Trojan Completely

This Trojan can spy on you, access personal information on your PC and may infect you with different malware eventually. It may track your personal information and send all that to hackers, from which they can profit. To completely get rid of the Win32/Delf.NRJ Trojan horse from your PC, carefully follow the step-by-step removal instructions provided below.

1. Boot Your PC In Safe Mode to isolate and remove Win32/Delf.NRJ

1. Boot Your PC Into Safe Mode

1. For Windows 7,XP and Vista. 2. For Windows 8, 8.1 and 10.

For Windows XP, Vista, 7 systems:

1. Remove all CDs and DVDs, and then Restart your PC from the “Start” menu.
2. Select one of the two options provided below:

For PCs with a single operating system: Press “F8” repeatedly after the first boot screen shows up during the restart of your computer. In case the Windows logo appears on the screen, you have to repeat the same task again.

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For PCs with multiple operating systems: Тhe arrow keys will help you select the operating system you prefer to start in Safe Mode. Press “F8” just as described for a single operating system.

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3. As the “Advanced Boot Options” screen appears, select the Safe Mode option you want using the arrow keys. As you make your selection, press “Enter“.

4. Log on to your computer using your administrator account

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While your computer is in Safe Mode, the words “Safe Mode” will appear in all four corners of your screen.

Step 1: Open the Start Menu

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Step 2: Whilst holding down Shift button, click on Power and then click on Restart.
Step 3: After reboot, the aftermentioned menu will appear. From there you should choose Troubleshoot.

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Step 4: You will see the Troubleshoot menu. From this menu you can choose Advanced Options.

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Step 5: After the Advanced Options menu appears, click on Startup Settings.

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Step 6: Click on Restart.
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Step 7: A menu will appear upon reboot. You should choose Safe Mode by pressing its corresponding number and the machine will restart.

2. Remove Win32/Delf.NRJ with SpyHunter Anti-Malware Tool

2. Remove Win32/Delf.NRJ with SpyHunter Anti-Malware Tool

1. Install SpyHunter to scan for and remove Win32/Delf.NRJ.2. Scan with SpyHunter to Detect and Remove Win32/Delf.NRJ.
Step 1:Click on the “Download” button to proceed to SpyHunter’s download page.

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It is highly recommended to run a scan before purchasing the full version of the software to make sure that the current version of the malware can be detected by SpyHunter.

Step 2: Guide yourself by the download instructions provided for each browser.
Step 3: After you have installed SpyHunter, wait for it to automatically update.

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Step1: After the update process has finished, click on the ‘Scan Computer Now’ button.
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Step2: After SpyHunter has finished scanning your PC for any Win32/Delf.NRJ files, click on the ‘Fix Threats’ button to remove them automatically and permanently.
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Step3: Once the intrusions on your PC have been removed, it is highly recommended to restart it.

3. Remove Win32/Delf.NRJ with Malwarebytes Anti-Malware.

3. Remove Win32/Delf.NRJ with Malwarebytes Anti-Malware

1. Install Malwarebytes Anti-Malware to scan for and remove Win32/Delf.NRJ. 2. Scan your PC with MalwareBytes to remove all Win32/Delf.NRJ associated files automatically.
Step 1: Download Malwarebytes by clicking here.
Step 2: A pop-up window will appear. Click on the ‘Save File’ button. If it does not, click on the Download button and save it afterwards.
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Step 3: After you have downloaded the setup, simply open it.
Step 4: The installer should appear. Click on the ‘Next’ button.
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Step 5: Check the ‘I accept the agreement’ check circle if not checked if you accept it and click the ‘Next’ button once again.
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Step 6: Review and click on ‘Next’ on the following 4 steps that will appear afterwards and after that click on the ‘Install’ button.
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Step 7: After the installation process has completed click on the ‘Finish’ button and check the ‘Launch MalwareBytes AntiMalware’ check box.
Step 1: Launch MalwareBytes if you havent launched it after install.
Step 2: Wait for the software to update and then click on the blue ‘Scan Now’ button. If it doesnt start updating automatically, click on the blue ‘Update Now’ highlighted text.
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Step 3: At this point, after clicking the ‘Scan Now’ button, the system should start scanning your PC. It may take a while but be patient – it is worth it.
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Step 4: After the scan has been complete and all of the threats have been identified, click on the ‘Remove Selected’ button to detelete them permanently.
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Step 5: Once the scan has completed, MalwareBytes will prompt you to restart your computer. It is recommended to save all your data you are working on before restarting.

4. Remove Win32/Delf.NRJ with STOPZilla AntiMalware

4. Remove Win32/Delf.NRJ with STOPZilla AntiMalware

1. Install STOPZilla Anti Malware to scan for and remove Win32/Delf.NRJ. 2. Scan your PC with STOPZilla Anti Malware to remove all Win32/Delf.NRJ associated files completely.
Step 1: Download STOPZilla by clicking here.
Step 2: A pop-up window will appear. Click on the ‘Save File’ button. If it does not, click on the Download button and save it afterwards.
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Step 3: After you have downloaded the setup, simply open it.
Step 4: The installer should appear. Click on the ‘Next’ button.
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Step 5: Check the ‘I accept the agreement’ check circle if not checked if you accept it and click the ‘Next’ button once again.
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Step 6: Review and click on the ‘Install’ button.
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Step 7: After the installation process has completed click on the ‘Finish’ button.
Step 1: Launch STOPZilla if you havent launched it after install.
Step 2: Wait for the software to automatically scan and then click on the ‘Repair Now’ button. If it does not scan automatically, click on the ‘Scan Now’ button.
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Step 3: After the removal of all threats and associated objects, you should Restart your PC.

5. Back up your data to secure it against infections by Win32/Delf.NRJ in the future

5. Back up your data to secure it against attacks in the future

Security engineers recommend that you back up your files immediately, preferably on an external memory carrier in order to be able to restore them. In order to protect yourself from Win32/Delf.NRJ (For Windows Users) please follow these simple steps:

1. For Windows 7 and earlier 1. For Windows 8, 8.1 and 10 1. Enabling the Windows Defense Feature (Previous Versions)

1-Click on Windows Start Menu
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2-Type Backup And Restore
3-Open it and click on Set Up Backup
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4-A window will appear asking you where to set up backup. You should have a flash drive or an external hard drive. Mark it by clicking on it with your mouse then click on Next.
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5-On the next window, the system will ask you what do you want to backup. Choose the ‘Let Me Choose’ option and then click on Next.
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6-Click on ‘Save settings and run backup’ on the next window in order to protect your files from possible attacks by Win32/Delf.NRJ.
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1-Press Windows button + R
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2-In the window type ‘filehistory’ and press Enter
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3-A File History window will appear. Click on ‘Configure file history settings’
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4-The configuration menu for File History will appear. Click on ‘Turn On’. After its on, click on Select Drive in order to select the backup drive. It is recommended to choose an external HDD, SSD or a USB stick whose memory capacity is corresponding to the size of the files you want to backup.
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5-Select the drive then click on ‘Ok’ in order to set up file backup and protect yourself from Win32/Delf.NRJ.

1- Press Windows button + R keys.
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2- A run windows should appear. In it type ‘sysdm.cpl’ and then click on Run.
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3- A System Properties windows should appear. In it choose System Protection.
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5- Click on Turn on system protection and select the size on the hard disk you want to utilize for system protection.
6- Click on Ok and you should see an indication in Protection settings that the protection from Win32/Delf.NRJ is on.
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Restoring a file via Windows Defense feature:
1-Right-click on the encrypted file, then choose Properties.
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2-Click on the Previous Versions tab and then mark the last version of the file.
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3-Click on Apply and Ok and the file encrypted by Win32/Delf.NRJ should be restored.

NOTE! Substantial notification about the Win32/Delf.NRJ threat: Manual removal of Win32/Delf.NRJ requires interference with system files and registries. Thus, it can cause damage to your PC. Even if your computer skills are not at a professional level, don’t worry. You can do the removal yourself just in 5 minutes, using a malware removal tool.
Avatar

Berta Bilbao

Berta is a dedicated malware researcher, dreaming for a more secure cyber space. Her fascination with IT security began a few years ago when a malware locked her out of her own computer.

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2 Comments

  1. AvatarJosue

    Hola Berta, me he infectado con este virus, he pasado el Nod32 y lo ha detectado y eliminado, pero, resulta que tengo el problema de tener cientos de .exe ocultos y con la letra g delante. Qué herramienta me recomiendas para poder restablecer toda mi computadora a su estado normal ya que estas soluciones que das en el post pues lo que hacen es eliminarlo. Saludos!

    Reply
    1. AvatarMilena Dimitrova

      Hi Josue,

      Can you tell us more about these .exe files? Why do you think they are infected or malicious?

      Reply

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