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Remove Win32/Delf.NRJ Trojan Totally from Your PC

by   |  April 26, 2020  |  2 Comments   , ,

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.

Threat Summary

Name Win32/Delf.NRJ
Type Backdoor, Trojan
Short Description The Trojan opens a backdoor. The backdoor can give unauthorized, remote access to a computer to a hacker.
Symptoms Through the backdoor, a hacker may steal data, may perform Denial of Service attacks or run executables.
Distribution Method Targeted Attacks, Email Attachments
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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.

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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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How to Remove Win32/Delf.NRJ from Windows.

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

OFFER

Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your PC with SpyHunter

Keep in mind, that SpyHunter’s scanner is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware removal tool to remove the malware threats. Read our SpyHunter 5 review. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria

1. Hold Windows key() + R

2. The "Run" Window will appear. In it, type "msconfig" and click OK.

3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".
Tip: Make sure to reverse those changes by unticking Safe Boot after that, because your system will always boot in Safe Boot from now on.

4. When prompted, click on "Restart" to go into Safe Mode.

5. You can recognise Safe Mode by the words written on the corners of your screen.

Step 2: Uninstall Win32/Delf.NRJ and related software from Windows

Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it. To do that:

1. Hold the Windows Logo Button and "R" on your keyboard. A Pop-up window will appear.

2. In the field type in "appwiz.cpl" and press ENTER.

3. This will open a window with all the programs installed on the PC. Select the program that you want to remove, and press "Uninstall"
Follow the instructions above and you will successfully uninstall most programs.

Step 3: Clean any registries, created by Win32/Delf.NRJ on your computer.

The usually targeted registries of Windows machines are the following:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

You can access them by opening the Windows registry editor and deleting any values, created by Win32/Delf.NRJ there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.

2. When you open it, you can freely navigate to the Run and RunOnce keys, whose locations are shown above.

3. You can remove the value of the virus by right-clicking on it and removing it.
Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.

IMPORTANT!
Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode.
This will enable you to install and use SpyHunter 5 successfully.

Step 4: Scan for Win32/Delf.NRJ with SpyHunter Anti-Malware Tool

1. Click on the "Download" button to proceed to SpyHunter's download page.

It is 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. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria.

2. After you have installed SpyHunter, wait for it to update automatically.

SpyHunter5-update-2018

3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.

SpyHunter5-Free-Scan-2018

4. After SpyHunter has finished scanning your PC for any files of the associated threat and found them, you can try to get them removed automatically and permanently by clicking on the 'Next' button.

SpyHunter-5-Free-Scan-Next-2018

If any threats have been removed, it is highly recommended to restart your PC.


Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer

Get rid of Win32/Delf.NRJ from Mac OS X.

Step 1: Uninstall Win32/Delf.NRJ and remove related files and objects

OFFER
Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your Mac with SpyHunter for Mac
Keep in mind, that SpyHunter for Mac needs to purchased to remove the malware threats. Click on the corresponding links to check SpyHunter’s EULA and Privacy Policy


1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:

2. Find Activity Monitor and double-click it:

3. In the Activity Monitor look for any suspicious processes, belonging or related to Win32/Delf.NRJ:

Tip: To quit a process completely, choose the “Force Quit” option.

4. Click on the "Go" button again, but this time select Applications. Another way is with the ⇧+⌘+A buttons.

5. In the Applications menu, look for any suspicious app or an app with a name, similar or identical to Win32/Delf.NRJ. If you find it, right-click on the app and select “Move to Trash”.

6: Select Accounts, after which click on the Login Items preference. Your Mac will then show you a list of items that start automatically when you log in. Look for any suspicious apps identical or similar to Win32/Delf.NRJ. Check the app you want to stop from running automatically and then select on the Minus (“-“) icon to hide it.

7: Remove any left-over files that might be related to this threat manually by following the sub-steps below:

  • Go to Finder.
  • In the search bar type the name of the app that you want to remove.
  • Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
  • If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.

In case you cannot remove Win32/Delf.NRJ via Step 1 above:

In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:

Disclaimer! If you are about to tamper with Library files on Mac, be sure to know the name of the virus file, because if you delete the wrong file, it may cause irreversible damage to your MacOS. Continue on your own responsibility!

1: Click on "Go" and Then "Go to Folder" as shown underneath:

2: Type in "/Library/LauchAgents/" and click Ok:

3: Delete all of the virus files that have similar or the same name as Win32/Delf.NRJ. If you believe there is no such file, do not delete anything.

You can repeat the same procedure with the following other Library directories:

→ ~/Library/LaunchAgents
/Library/LaunchDaemons

Tip: ~ is there on purpose, because it leads to more LaunchAgents.

Step 2: Scan for and remove Win32/Delf.NRJ files from your Mac

When you are facing problems on your Mac as a result of unwanted scripts and programs such as Win32/Delf.NRJ, the recommended way of eliminating the threat is by using an anti-malware program. SpyHunter for Mac offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.

Click the button below below to download SpyHunter for Mac and scan for Win32/Delf.NRJ:


Download

SpyHunter for Mac


Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer

Remove Win32/Delf.NRJ from Google Chrome.

Step 1: Start Google Chrome and open the drop menu

Step 2: Move the cursor over "Tools" and then from the extended menu choose "Extensions"

Step 3: From the opened "Extensions" menu locate the unwanted extension and click on its "Remove" button.

Step 4: After the extension is removed, restart Google Chrome by closing it from the red "X" button at the top right corner and start it again.


Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer

Erase Win32/Delf.NRJ from Mozilla Firefox.

Step 1: Start Mozilla Firefox. Open the menu window

Step 2: Select the "Add-ons" icon from the menu.

Step 3: Select the unwanted extension and click "Remove"

Step 4: After the extension is removed, restart Mozilla Firefox by closing it from the red "X" button at the top right corner and start it again.


Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer

Uninstall Win32/Delf.NRJ from Microsoft Edge.

Step 1: Start Edge browser.

Step 2: Open the drop menu by clicking on the icon at the top right corner.

Step 3: From the drop menu select "Extensions".

Step 4: Choose the suspected malicious extension you want to remove and then click on the gear icon.

Step 5: Remove the malicious extension by scrolling down and then clicking on Uninstall.


Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer

Remove Win32/Delf.NRJ from Safari.

Step 1: Start the Safari app.

Step 2: After hovering your mouse cursor to the top of the screen, click on the Safari text to open its drop down menu.

Step 3: From the menu, click on "Preferences".

stf-safari preferences

Step 4: After that, select the 'Extensions' Tab.

stf-safari-extensions

Step 5: Click once on the extension you want to remove.

Step 6: Click 'Uninstall'.

stf-safari uninstall

A pop-up window will appear asking for confirmation to uninstall the extension. Select 'Uninstall' again, and the Win32/Delf.NRJ will be removed.

How to Reset Safari
IMPORTANT: Before resetting Safari make sure you back up all your saved passwords within the browser in case you forget them.

Start Safari and then click on the gear leaver icon.

Click the Reset Safari button and you will reset the browser.


Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer

Eliminate Win32/Delf.NRJ from Internet Explorer.

Step 1: Start Internet Explorer.

Step 2: Click on the gear icon labeled 'Tools' to open the drop menu and select 'Manage Add-ons'

Step 3: In the 'Manage Add-ons' window.

Step 4: Select the extension you want to remove and then click 'Disable'. A pop-up window will appear to inform you that you are about to disable the selected extension, and some more add-ons might be disabled as well. Leave all the boxes checked, and click 'Disable'.

Step 5: After the unwanted extension has been removed, restart Internet Explorer by closing it from the red 'X' button located at the top right corner and start it again.

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. Milena DimitrovaMilena 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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