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 |
| Detection Tool |
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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:
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.
- Guide 1: How to Remove Win32/Delf.NRJ from Windows.
- Guide 2: Get rid of Win32/Delf.NRJ from Mac OS X.
- Guide 3: Remove Win32/Delf.NRJ from Google Chrome.
- Guide 4: Erase Win32/Delf.NRJ from Mozilla Firefox.
- Guide 5: Uninstall Win32/Delf.NRJ from Microsoft Edge.
- Guide 6: Remove Win32/Delf.NRJ from Safari.
- Guide 7: Eliminate Win32/Delf.NRJ from Internet Explorer.
Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer
How to Remove Win32/Delf.NRJ from Windows.
Step 1: Boot Your PC In Safe Mode to isolate and remove Win32/Delf.NRJ
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:
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:
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.
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.
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
1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:
- 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:
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 malware from your Mac
When you are facing problems on your Mac as a result of unwanted scripts, programs and malware, the recommended way of eliminating the threat is by using an anti-malware program. Combo Cleaner offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.
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".
Step 4: After that, select the 'Extensions' Tab.
Step 5: Click once on the extension you want to remove.
Step 6: Click '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.
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.
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!
Hi Josue,
Can you tell us more about these .exe files? Why do you think they are infected or malicious?