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How to open NULL file extensions

Learn how to open NULL file extensions on your phone and laptop from A3 Techworld. Files that are given the NULL extensions are known as NULL image files. Have you found, downloaded, or received a NULL file, but don’t know which software program is required to open it? DO NOT OPEN THE NULL FILE – READ BELOW

Things You Should Know About NULL Files:

  • NULL files are usually corrupted files that were generated by a virus or malware.
  • Some third-party apps may create files ending with .null when they encounter errors.
  • Some NULL files will open with the computer’s default text editor (like Notepad or TextEdit).
  • Tap the file on your phone or tablet to see if you can open it without a computer.

What is a NULL file? The .null file extension is used by some third-party Windows programs for a corrupted data file format. When a program generates a file with corrupted data, the program may use the .null file extension for the file, in order to flag it as a file that can’t be activated due to some issues with its content.

What is a NULL file in cyber terms? Null is a ransomware-type virus discovered by a malware security researcher, Michael Gillespie. Once infiltrated, Null encrypts various files using the AES-256 algorithm. During encryption, this malware appends filenames with the “.

How to open Null files (2022)

There are lots of programs that can open different file extensions, and there are some simple ways you can tell which one to use – This post shows you how you can open all NULL file extensions.

A universal file viewer is the best way to open a NULL file. Programs like File Magic can open many different types of files, depending on the format. Although, some files may not be compatible with these programs. If your NULL file isn’t compatible, it will only open in binary format.

For Windows operating system, Final Media player and Miro are able to open certain types of NULL files. Remember, different programs may use NULL files for different purposes, so you may need to try out a few of them to be able to open your specific file.

If you’re trying to open a NULL file on your laptop, depending on the type of file it is. You can find the file type listed in the file’s properties. On a Windows PC, right-click the file, click “Properties“, then look under “Type of File.” On a Mac computer, right-click the file, click “More Info,” then look under “Kind”.

Contacting the software developer is another easy way to get help opening your NULL file, the software developer or company will provide a guide for you or even a tool for opening the file with a NULL extension.


Null is a ransomware-type virus discovered by a malware security researcher, Michael Gillespie. Once infiltrated, Null encrypts various files using the AES-256 algorithm.

During encryption, this malware appends filenames with the “.null” extension (for instance, “sample.jpg” is renamed to “sample.jpg.null“). Following successful encryption, Null opens a pop-up window with five tabs that provide detailed information about “What happened”.

The first tab (“What happened to my PC“) informs victims of the encryption and encourages them to purchase a decryption program. The second tab (“Encrypted files“) simply contains a list of compromised files. The third tab (“How do I recover my files?“) explains how to receive the aforementioned decrypter.

The fourth tab (“How do I send bitcoins?“) supposedly explains how to submit payment, however, at the time of research, it did not contain any relevant text. The last, fifth, tab (“What is AES 256?“) provides detailed information regarding the encryption algorithm.

As mentioned above, Null employs AES-256 – an asymmetric encryption algorithm – and thus, a unique key (used to encrypt/decrypt files) is generated for each victim. This key is stored on a remote server controlled by cybercriminals who attempt to sell a decryption tool (with an embedded key) for 2.2 Bitcoins (currently equivalent to ~$10000).

How to open Null files Using a Windows or Mac Computer

Time to complete (A3 Techworld):  10 minutes.

open Null files Using a Windows or Mac Computer

  1. Navigate to the .null file on your computer.

    If you don’t have a virus, you can try opening the NULL file in a text editor to see what’s inside. This won’t always work, as the file may contain code that can’t be translated to text.

  2. Right-click the file.

    If you’re on a Mac, press Ctrl as you click or press the trackpad with two fingers to right-click.

  3. Select (Open With)

    You’ll see this on the menu.

  4. Select your text editor in the list

    If you’re using a Windows computer, you should see Notepad. If you’re using a Mac, you’ll see TextEdit instead. This will attempt to display a plain text version of the NULL file in your text editor.
    -If the file is a jumbled mess, it’s not a text file. It’s possible it’s some sort of media file—you can try using a media player like Final Media Player or VLC Media Player to open it.
    -You may want to use some sort of universal file viewer if the text editor doesn’t work.
    -Since a file ending with .null isn’t going to be important to any apps, it’s likely safe to delete.

How to open Null files Using an Android, iPhone, or iPad

1. Open your file manager on your Android or iOS device

Tap My Files (Android) or Files (iPhone/iPad) to see the files on your phone or tablet.

  • The file manager’s name may vary depending on your Android version.

2. Go to the Downloads folder

This might say “Recently Downloaded” instead. However, the .null file should be there if you downloaded it as an email attachment.

3. Tap the file

If you have compatible apps for the NULL file, it will open.

  • If it doesn’t open, you most likely need to use your computer, or simply delete it.

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