Udla Virus

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*Udla is a variant of Stop/DJVU. Source of claim SH can remove it.


Udla is a Windows virus of the Ransomware variety that secretly locks up the most important data of its victims. The process allowing Udla to render the files inaccessible is known as file encryption and it can only be unlocked through a matching decryption key.

The Udla ransomware will leave a _readme.txt file with instructions

The goal of the hackers behind this virus is to force you to pay them money for the key that will unlock your data. As soon as the virus finalizes the encryption process and ensures that all files targeted by it are no longer available to you, it generates a note in the form of a banner or a notepad file. In this note, the hackers behind Udla give strict and detailed instructions to their victims on how to pay the ransom required for the decryption key that will unlock the unavailable files. In many cases, the blackmailers behind viruses of the Ransomware file-encryption type demand the ransom money in Bitcoin (or in another similar currency) in order for the money transfer to be untraceable by the government. There could even be instructions on how to purchase Bitcoins from various sources.

If you are faced with a Ransomware lockdown of your files and are required to pay money for the files’ release, we advise you to take your time to research and learn more about the available alternatives before you decide on what to do next.

The Udla virus

The Udla virus is a harmful computer program created by hackers who seek to extort money from you by locking-up your files. The Udla virus targets frequently used file types and restricts access to them so that you are forced to pay a ransom.

The Udla virus will encrypt your files

If the files that this threat has managed to seal on your computer aren’t very important or can be restored from backups, all you’d need to do is remove the virus (and the instructions from our guide will show you how). However, if there are any highly important pieces of data that have been encrypted by the virus and you have no backups for them, then you should carefully consider your options. One possible solution is to pay the ransom, but there is no guarantee that the cyber-criminals behind the Ransomware would supply you with the correct decryption key (or any key for that matter). There are countless instances of Ransomware victims that have spent a lot of money on paying the ransom and have never received anything from the criminals that had been blackmailing them.

The Udla file decryption

The Udla file decryption is the opposite process of the encryption that this virus has applied to your files. The Udla file decryption can be completed through the help of a special decryption key or using a free Ransomware-specific decryptor tool.

As we already established, getting the key may not always be possible but maybe you can find a decryption tool that can be downloaded for free and help you recover your files. There is a list of such tools on our site as well as some other file-recovery suggestions that do not involve paying a ransom. Before you check them out, however, it is important to remove the infection from your system in order to prevent future encryption of more of your files.


Danger LevelHigh (Ransomware is by far the worst threat you can encounter)
Data Recovery ToolNot Available
Detection Tool

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*Udla is a variant of Stop/DJVU. Source of claim SH can remove it.

Remove Udla Ransomware


It’s a good idea to restart your computer in Safe Mode by following the instructions in the link before attempting to remove Udla.

Prior to restarting the system, though, make sure you’ve bookmarked this page by clicking on the bookmark icon in your browser’s address bar. In this way, you don’t have to keep looking for the removal instructions every time your computer or browser restarts, and you can immediately access the removal guide.

The remaining Udla removal actions listed on this page can be completed safely once your computer has been properly rebooted in Safe Mode.



*Udla is a variant of Stop/DJVU. Source of claim SH can remove it.

Most ransomware viruses, such as the Udla, operate invisibly in the background of a computer’s operating system, making detection nearly impossible. Because of this, they are able to wreak havoc on the system while remaining unnoticed.

If you’re dealing with ransomware on your computer, one of the most difficult chores is to identify and terminate any potentially harmful processes that may be operating on your computer. To successfully detect and stop potentially harmful processes, it is imperative that the following instructions be followed as described:

Using CTRL+SHIFT+ESC key combination, open the Windows Task Manager, and then choose the Processes tab from the top menu.

Right-click on any processes that are consuming a lot of CPU and memory resources, have an odd name, or seem suspicious, and then use the fast menu to check the files linked with the selected process by clicking on “Open File Location“.


Use the free online virus scanning tool below to ensure that the files associated with the process in question are clean of any potentially harmful code.

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    As soon as a potentially harmful file is identified, the process associated with it should be ended and the files themselves should be properly erased from your computer.

    If a process contains potentially harmful files, to end it, you need to use the right-click menu (right-click on the process) and select End Process.


    The next step is to disable any harmful startup items that might have been added to the system as a result of the ransomware attack.

    Using the Windows search bar, type in msconfig, and open System Configuration from the results. After that, browse through the Startup tab and see if there are any suspicious Startup entries:


    You should investigate online any startup item that comes from an “Unknown” manufacturer or has a weird name, and uncheck the checkbox next to it if you find enough evidence that it belongs to the ransomware. Also, consider looking for any other startup items that you are unable to identify with the programs that launch when your machine starts up. Make sure you don’t disable the start-up items associated with programs that you trust or that are connected to the system.


    *Udla is a variant of Stop/DJVU. Source of claim SH can remove it.

    If you want to thoroughly remove all traces of Udla from your system and prevent the ransomware from reappearing or leaving dangerous components behind, searching the system’s registry for malicious entries is an incredibly critical step.

    The Registry Editor may quickly be accessed by typing regedit in the Windows search field and pressing Enter. When the Registry Editor window open, use the CTRL and F key combination to search for the ransomware by carefully typing the virus’s name in the Find box. Remove any entries that include the ransomware’s name from the list by right-clicking and carefully deleting them.

    Attention! Delete just the ransomware-related entries from your registry. If you delete anything else,  you may risk damaging your system and the applications you’ve already installed on it. To safely remove all traces of Udla and other ransomware from your computer’s registry, please use a professional removal software like the one linked on this page.

    When no more results are found, exit the Registry Editor and manually search each of the locations listed below.  To open them,  type each one in the Windows search field and press Enter:

    1. %AppData%
    2. %LocalAppData%
    3. %ProgramData%
    4. %WinDir%
    5. %Temp%

    Once you’ve opened each location, search for and remove any hazardous files or folders that may be connected to the infection. For the sake of purging your system of any potentially dangerous temporary files, just empty the Temp folder by deleting everything stored there.

    The next place to check for malicious modifications on your machine is the Hosts file. Keep an eye for any changes that could have been made without your knowledge, and let us know if you spot anything unusual in the comments section. We’ll investigate and get back to you with a reply.

    If you want to go to the Hosts file, press down Windows and R keys together. A Run box will pop up, where you’ll need to paste the following command and hit Enter to for it to work:

    notepad %windir%/system32/Drivers/etc/hosts

    If your Hosts file has been altered to contain some suspicious-looking IP addresses under Localhost, as seen in the following example, please notify us:

    hosts_opt (1)

    If everything in your file appears to be in order, you may just close it without making any modifications.


    How to Decrypt Udla files

    In order to decrypt the encrypted data, victims need to first investigate the alternative solutions depending on the variant of ransomware that has infected their machine. In order to detect which Ransomware variant you are dealing with, the first step is to look at the file extensions attached to the encrypted files.

    New Djvu Ransomware

    STOP Djvu Ransomware is the latest variant of the Djvu Ransomware family, which demands a ransom from the victims and targets machines all round the world.

    To find out if you have been attacked with this variant, search for the .Udla file extension at the end of the files that have been encrypted by the virus. Files that have been encrypted by this malware usually have this extension automatically added to them. Even though this is a new threat and, typically, decrypting files of new threats can be quite challenging, if your flies have been encoded by using an offline key, there is a change to decrypt them. A decryption tool may be found on the following page, which you can access by clicking on the link provided:



    First, you need to download the decryption application from the URL provided above, then click “Run as Administrator” on the downloaded file and then select “Yes” to begin. If there are any short instructions or the licensing agreement on your screen, make sure you read them both before continuing.

    To begin the process of decryption, you must click the Decrypt button. This will begin the process of decrypting the encrypted information. Keep in mind that this program may not be able to decode data encrypted using unknown offline keys or online encryption. Please let us know if you have any questions or concerns in the comments section below, and we will try our best to help.

    Important! Check your computer for ransomware-related files and harmful registry entries before attempting to decode the encrypted data. The online virus scanner and the anti-virus software available on our site can help you remove Udla and other harmful malware that is circulating on the internet.


    About the author


    Brandon Skies

    Brandon is a researcher and content creator in the fields of cyber-security and virtual privacy. Years of experience enable him to provide readers with important information and adequate solutions for the latest software and malware problems.

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