HOOP VIRUS (.hoop FILE) ✔️ REMOVAL & DECRYPT FILES

Written by Brendan Smith

The Hoop virus is a STOP/DJVU family of ransomware-type infections. This virus encrypts your files (video, photos, documents) that can be tracked by a specific “.hoop” extension. It uses a strong encryption method, which makes it impossible to calculate the key in any way.

Hoop uses a unique key for each victim, with one exception:

  • If Hoop cannot establish a connection to its command and control server (C&C Server) before starting the encryption process, it uses the offline key. This key is the same for all victims, making it possible to decrypt files encrypted during a ransomware attack.
Brendan Smith
Brendan Smith
IT Security Expert

First, scan your PC with antivirus tool!

I will try to help you remove Hoop virus and will show how to decrypt or restore encrypted files. There is no better way to recognize, remove and prevent ransomware than to use an anti-malware software from GridinSoft.
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I have gathered a complete collection of all possible solutions, tips, and practices in neutralizing the Hoop virus and decrypting files. In some cases, it is easy to recover your files. And sometimes it is just impossible.

There are several universal methods for recovering encrypted .hoop files, which will be demonstrated below. It is vital to read the entire instruction manual carefully and make sure to understand it all. Do not skip any steps. Each of these steps is very important and must be completed by you.

Hoop virus?

☝️ Hoop can be correctly identify as a STOP/DJVU ransomware-type virus.

Hoop

🤔 Hoop virus is ransomware that originates from the DJVU/STOP family. Its primary purpose is to encrypt files that are important for you. After that ransomware virus asks its victims for a ransom fee ($490 – $980) in BitCoin.

The Hoop ransomware is a kind of malware that encrypted your files and then forced you to pay to restore them. Note that Djvu/STOP ransomware family was first revealed and discovered by virus analyst Michael Gillespie.

Hoop virus is basically similar to other representatives of DJVU ransomware like: Reqg, Muuq, Muuq. This virus encrypt all popular file types and adds its particular “.hoop” extension into all files. For example, the file “1.jpg”, will be changed into “1.jpg.hoop“. As soon as the encryption is successfully accomplished, virus creates a specific message file “_readme.txt” and adds it into all folders that contain the modified files.

The image below gives a clear vision of how the files with the “.hoop” extension look like:

Hoop Virus - encrypted .hoop files

Hoop File (STOP/DJVU Ransomware)

Name Hoop Virus
Ransomware family1 DJVU/STOP2 ransomware
Extension .hoop
Ransomware note _readme.txt
Ransom From $490 to $980 (in Bitcoins)
Contact manager@mailtemp.ch, managerhelper@airmail.cc
Detection3 Trojan:Win32/TurtleSyr.A!dha, Generic PUA FE (PUA), Trojan.RansomIH.S14612337
Symptoms
  • Encrypted most of your files (photos, videos, documents) and adds a particular “.hoop” extension;
  • Can delete Volume Shadow copies to make victim’s attempts to restore data impossible;
  • Adds a list of domains to HOSTS file to block access to certain security-related sites;
  • Installs password-stealing Trojan on the system, like Azorult Spyware;
Fix Tool To remove possible malware infections, scan your PC:


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This text asking payment is for restore files via decryption key:

_readme.txt (STOP/DJVU Ransomware)

_readme.txt (STOP/DJVU Ransomware) – The scary alert demanding from users to pay the ransom to decrypt the encoded data contains these frustrating warnings

The cryptography algorithm used by DJVU/STOP ransomware is AES-256. So, if your documents got encrypted with an online decryption key, which is unique. The sad reality is that it is impossible to decrypt the files without the unique key.

In case if Hoop worked in online mode, it is impossible for you to gain access to the AES-256 key. It is stored on a remote server owned by the criminals who promote the Hoop virus.

For receiving decryption key the payment should be $980. To obtain the payment details, the victims are encouraged by the message to contact the frauds by email (manager@mailtemp.ch).

The message by the ransomware states the following information:

ATTENTION!

Don't worry, and you can return all your files!

All your files like photos, databases, documents, and others are encrypted with the strongest encryption and unique key.
The only method of recovering files is to purchase a decrypt tool and unique key for you.
This software will decrypt all your encrypted files.

What guarantees do you have?

You can send one of your encrypted files from your PC, and we decrypt it for free.
But we can decrypt only 1 file for free. Furthermore, the file must not contain valuable information.

You can get and look video overview decrypt tool:

https://we.tl/t-WJa63R98Ku

The price of a private key and decrypt software is $980.
Discount 50% available if you contact us first 72 hours, that's the price for you is $490.

Please note that you'll never restore your data without payment.

Check your e-mail "Spam" or "Junk" folder if you don't get an answer in more than 6 hours.

To get this software you need writes on our e-mail:

manager@mailtemp.ch

Reserve an e-mail address to contact us:

managerhelper@airmail.cc

Your personal ID:
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Do not pay for Hoop!

Please, try to use the available backups, or Decrypter tool

_readme.txt file also indicates that the computer owners must get in touch with the Hoop representatives during 72 hours starting from when files were encrypted. On the condition of getting in touch within 72 hours, users will be granted a 50% rebate. Thus the ransom amount will be minimized down to $490). However, stay away from paying the ransom!

I certainly advise that you do not contact these crooks and do not pay. One of the most real working solution to recover the lost data – just using the available backups, or use Decrypter tool.

The peculiarity of all such viruses apply a similar set of actions for generating the unique decryption key to recover the ciphered data.

Thus, unless the ransomware is still under the stage of development or possesses some hard-to-track flaws, manually recovering the ciphered data is a thing you can’t perform. The only solution to prevent losing your valuable data is to make backups of your crucial files regularly.

Note that even if you do maintain such backups regularly, they ought to be put into a specific location without loitering, not being connected to your main workstation.

For instance, the backup may be kept on the USB flash drive or some alternative external hard drive storage. Optionally, you may refer to the help of online (cloud) information storage.

Needless to mention when you maintain your backup data on your common device, it may be similarly ciphered as well as other data.

For this reason, locating the backup on your main device is surely not a wise idea.

How I was infected?

Ransomware has a various methods to built into your system. But it doesn’t really matter what method had place in your case.

Hoop infection attack

Hoop virus attack following a successful phishing attempt.

Nevertheless, these are the common leaks through which it may be injected into your PC:

  • hidden installation along with other apps, especially the utilities that work as freeware or shareware;
  • dubious link in spam emails leading to the virus installer
  • online free hosting resources;
  • using illegal peer-to-peer (P2P) resources for downloading pirated software.

There were cases when the Hoop virus was disguised as some legitimate tool, for example, in the messages demanding to initiate some unwanted software or browser updates. This is typically the way how some online frauds aim to force you into installing the Hoop ransomware manually, by actually making you directly participate in this process.

Surely, the bogus update alert will not indicate that you are actually going to inject the ransomware. This installation will be concealed under some alert mentioning that allegedly you should update Adobe Flash Player or some other dubious program whatsoever.

Of course, the cracked apps represent the damage too. Using P2P is both illegal and may result in the injection of serious malware, including the Hoop ransomware.

To sum up, what can you do to avoid the injection of the Hoop ransomware into your device? Even though there is no 100% guarantee to prevent your PC from getting damaged, there are certain tips I want to give you to prevent Hoop penetration. You must be cautious while installing free software today.

Make sure you always read what the installers offer in addition to the main free program. Stay away from opening dubious email attachments. Do not open files from the unknown addressees. Of course, your current security program must always be updated.

The malware does not speak openly about itself. It will not be mentioned in the list of your available programs. However, it will be masked under some malicious process running regularly in the background, starting from the moment when you launch your PC.

How To Remove Hoop Virus?

In addition to encode a victim’s files, the Hoop virus has also started to install the Azorult Spyware on PC to steal account credentials, cryptocurrency wallets, desktop files, and more.4
Reasons why I would recommend GridinSoft5

There is no better way to recognize, remove and prevent ransomware than to use an anti-malware software from GridinSoft6.

  1. Download Removal Tool.

    You can download GridinSoft Anti-Malware by clicking the button below:

  2. Run the setup file.

    When setup file has finished downloading, double-click on the setup-antimalware-fix.exe file to install GridinSoft Anti-Malware on your PC.

    Run Setup.exe

    An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.

    GridinSoft Anti-Malware Setup

  3. Press “Install” button.

    GridinSoft Anti-Malware Install

  4. Once installed, Anti-Malware will automatically run.

    GridinSoft Anti-Malware Splash-Screen

  5. Wait for complete.

    GridinSoft Anti-Malware will automatically start scanning your computer for Hoop infections and other malicious programs. This process can take a 20-30 minutes, so I suggest you periodically check on the status of the scan process.

    GridinSoft Anti-Malware Scanning

  6. Click on “Clean Now”.

    When the scan has completed, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.

    GridinSoft Anti-Malware Scan Result
  7. Trojan Killer for special instances

    In some certain instances, Hoop ransomware can block the running of setup files of different anti-malware programs. In this situation, you need to utilize the removable drive with a pre-installed antivirus tool.

    There is a really little number of security tools that are able to be set up on the USB drives, and antiviruses that can do so in most cases require to obtain quite an expensive license. For this instance, I can recommend you to use another solution of GridinSoft – Trojan Killer Portable. It has a 14-days cost-free trial mode that offers the entire features of the paid version 7. This term will definitely be 100% enough to wipe malware out.

How To Decrypt .hoop Files?

Restore solution for big “.hoop files

Try removing .hoop extension on a few BIG files and opening them. Either the Hoop ransomware read and did not encrypt the file, or it bugged and did not add the filemarker. If your files are very large (2GB+), the latter is most likely. Please, let me know in comments if that will work for you.

The newest extensions released around the end of August 2019 after the criminals made changes. This includes Nooa, Guer, Aeur, etc.

As a result of the changes made by the criminals, STOPDecrypter is no longer supported. It has been removed and replaced with the Emsisoft Decryptor for STOP Djvu Ransomware developed by Emsisoft and Michael Gillespie.

You can download free decryption tool here: Decryptor for STOP Djvu.

  1. Download and run decryption tool.

    Start downloading the decryption tool.

    Make sure to launch the decryption utility as an administrator. You need to agree with the license terms that will come up. For this purpose, click on the “Yes” button:

    Emsisoft Decryptor - license terms

    As soon as you accept the license terms, the main decryptor user interface comes up:

    Emsisoft Decryptor - user interface

  2. Select folders for decryption.

    Based on the default settings, the decryptor will automatically populate the available locations in order to decrypt the currently available drives (the connected ones), including the network drives. Extra (optional) locations can be selected with the help of the “Add” button.

    Decryptors normally suggest several options considering the specific malware family. The current possible options are presented in the Options tab and can be activated or deactivated there. You may locate a detailed list of the currently active Options below.

  3. Click on the “Decrypt” button.

    As soon as yo add all the desired locations for decryption into the list, click on the “Decrypt” button in order to initiate the decryption procedure.

    Note that the main screen may turn you to a status view, letting you know of the active process and the decryption statistics of your data:

    Emsisoft Decryptor - the decryption statistics

    The decryptor will notify you as soon as the decryption procedure is completed. If you need the report for your personal papers, you can save it by choosing the “Save log” button. Note that it is also possible to copy it directly to your clipboard and to paste it into emails or messages here if you need to do so.

The Emsisoft Decryptor might display different messages after a failed attempt to restore your hoop files:

✓ Error: Unable to decrypt file with ID: [your ID]
There is no corresponding decryption key in the Emsisoft decryptor’s database.
✓ No key for New Variant online ID: [your ID]
Notice: this ID appears to be an online ID, decryption is impossible
Your original files were encrypted with an online key. So no one else has the same encryption/decryption key pair. Recovery of hoop files without paying the criminals is impossible. 🙁
✓ Result: No key for new variant offline ID: [example ID]
This ID appears to be an offline ID. Decryption may be possible in the future.
An offline key was used, but files could not be restored (the offline decryption key isn’t available yet). But, receiving this message is good news for you because it might be possible to restore your hoop files in the future. 🙂
It can take a few weeks or months until the decryption key gets found and uploaded to the decryptor. Please follow updates regarding the decryptable DJVU versions here.
✓ Remote name could not be resolved
It’s an indication of a DNS issue on your PC. Our first recommendation is to reset your HOSTS file back to default.

How to Restore .hoop Files?

In some case Hoop ransomware is not doom for your files…

Hoop ransomware encryption mechanism feature is next: it encrypts every file byte-by-byte, then saves a file copy, deleting (and not overriding!) the original file. Hence, the file location information on the physical disk is lost, but the original file is not deleted from the physical disk. The cell, or the sector where this file was stored, can still contain this file, but it is not listed by the file system and can be overwritten by data that has been loaded to this disk after the deletion. Hence, it is possible to recover your files using special software.

I recently had my pc infected by the Hoop virus. It managed to bypass 2 Antivirus software and 2 malware fighters.

Anyway, after realizing it was an online algorithm, it is impossible to retrieve my encrypted files. I also had my backup drive plugged in at the time of the virus, and this was also infected, or so I thought. Every folder within my backup drive had been infected and was encrypted. However, despite losing some important files, I retrieved almost 80% of my 2TB storage.

When I went through the folders, I noticed the readme.txt ransom note in every folder. I opened some of the folders and found that all files that were not in a subfolder within that folder had been encrypted. However, I found a flaw and glimmer of hope when I went into the subfolders in other folders and found that these files had not been encrypted. Every folder within my c and d drives, including subfolders, had been encrypted, but this was not the case with the backup drive. Having subfolders created within a folder has saved 80% of my data.

As I said, I believe this to be only a small loophole on a backup drive. I’ve since found a further 10 % of my data on another hard drive on a different pc. So my advice is if you use a backup drive, create subfolders. I was lucky, I guess. But I was also unlucky that the virus hit as I was transferring some files from my backup.

Hopefully, this can help some other people in my situation.

Jamie Newland
Some pointers for recovery repair of Hoop files (true for all STOP/DJVU variants):

  • I have seen Hoop variants fail to encrypt deeper nested folders so that you can check that. You may find those are not encrypted.
  • This ransomware saves encrypted data to a new file, deletes the original. So there’s a slight chance part of that deleted file can be recovered using file recovery software. It’s unlikely the folder structure can be restored, so a free tool like PhotoRec may be as good as any.
  • This ransomware only partially encrypts (about the first 150 KB), so the not-encrypted part may be recoverable depending on file size and type of data.
  • Joep

    Recovering your files with PhotoRec

    PhotoRec is an open-source program, which is created for files recovery from damaged disks or for files recovery in case if they are deleted. However, as time has gone by, this program got the ability to recover the files of 400 different extensions. Hence, it can be used for data recovery after the ransomware attack

    At first, you need to download this app. It is 100% free, but the developer states that there is no guarantee that your files will be recovered. PhotoRec is distributed in a pack with other utility of the same developer – TestDisk. The downloaded archive will have the TestDisk name, but don’t worry. PhotoRec files are right inside.

    To open PhotoRec, you need to find and open “qphotorec_win.exe” file. No installation is required – this program has all the files it need inside of the archive, hence, you can fit it on your USB drive, and try to help your friend/parents/anyone who was been attacked by DJVU/STOP ransomware.

    PhotoRec file in the folder

    After the launch, you will see the screen showing you the full list of your disk spaces. However, this information is likely useless because the required menu is placed a bit higher. Click this bar, then choose the disk which was attacked by ransomware.

    Choose the disc in PhotoRec

    After choosing the disk, you need to choose the destination folder for the recovered files. This menu is located at the lower part of the PhotoRec window. The best desicion is to export them on USB drive or any other type of removable disk.

    Choosing the destination folder of recovery

    Then, you need to specify the file formats. This option is located at the bottom, too. As it was mentioned, PhotoRec can recover files of about 400 different formats.

    Choose the file format

    Finally, you can start files recovery by pressing the “Search” button. You will see the screen where the results of the scan and recovery are shown.

    Recovery process

    Hoop files recovery guide


    Frequently Asked Questions

    🤔 How can I open “.hoop” files?


    No way. These files are modified by ransomware. The contents of .hoop files are not available until they are decrypted.

    🤔 Hoop files contain important information. How can I decrypt them urgently?


    If your data remained in the .hoop files are very valuable, you most likely made a backup copy.
    If not, then you can try to restore them through the system function – Restore Point.
    All other methods will require patience.

    🤔 You have advised using GridinSoft Anti-Malware to remove Hoop. Does this mean that the program will delete my encrypted files?


    Of course not. Your encrypted files do not pose a threat to the computer. What happened has already happened.

    You need GridinSoft Anti-Malware to remove active system infections. The virus that encrypted your files is most likely still active and periodically runs a test for the ability to encrypt even more files. Also, these viruses install keyloggers and backdoors for further malicious actions (for example, theft of passwords, credit cards).

    🤔 Hoop virus has blocked infected PC: I can’t get the activation code.


    In this situation, you need to prepare the memory stick with a pre-installed Trojan Killer.

    🤔 Decryptor did not decrypt all my files, or not all of them were decrypted. What should I do?


    Have patience. You are infected with the new STOP/DJVU ransomware version, and decryption keys have not yet been released. Follow the news on our website.

    We will keep you posted when new Hoop keys or new decryption programs appear.

    🤔 What can I do right now?


    The Hoop ransomware encrypts only the first 150KB of files. So MP3 files are rather large; some media players (Winamp, for example) may play the files, but – the first 3-5 seconds (the encrypted portion) will be missing.

    You can try to find a copy of an original file that was encrypted:

    • Files you downloaded from the Internet that were encrypted, and you can download again to get the original.
    • Pictures that you shared with family and friends that they can send back to you.
    • Photos that you uploaded on social media or cloud services like Carbonite, OneDrive, iDrive, Google Drive, etc.)
    • Attachments in emails you sent or received and saved.
    • Files on an older computer, flash drive, external drive, camera memory card, or iPhone where you transferred data to the infected computer.

    Also, you can contact the following government fraud and scam sites to report this attack:

    To report the attack, you can contact local executive boards (A full list you can find here). For instance, if you live in USA, you can have a talk with FBI Local field office, IC3 or Secret Service.

    Video Guide

    It’s my favorite video tutorial: How to use GridinSoft Anti-Malware and Emsisoft Decryptor for fix ransomware infections.

    If the guide doesn’t help you to remove Hoop virus, please download the GridinSoft Anti-Malware that I recommended. Do not forget to share your experience in solving the problem. Please leave a comment here! This can help other victims to understand they are not alone. And together, we will find ways to deal with this issue.

    I need your help to share this article.

    It is your turn to help other people. I have written this article to help people like you. You can use the buttons below to share this on your favorite social media Facebook, Twitter, or Reddit.
    Brendan Smith
    HOOP Ransomware — How To Restore & Decrypt Files?

    Name: HOOP Virus

    Description: HOOP Virus is a DJVU family of ransomware-type infections. This infection encrypts important personal files (video, photos, documents). The encrypted files can be tracked by a specific .hoop extension. So, you can't use them at all. After that HOOP virus asks its victims for a ransom fee ($490 - $980) in BitCoin.

    Operating System: Windows

    Application Category: Virus

    Sending
    User Review
    4.1 (10 votes)
    Comments Rating 0 (0 reviews)

    References

    1. My files are encrypted by ransomware, what should I do now?
    2. About DJVU (STOP) Ransomware.
    3. Encyclopedia of threats.
    4. Windows passwords vulnerability (Mimikatz HackTool): https://howtofix.guide/mimikatz-hacktool/
    5. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
    6. More information about GridinSoft products: https://gridinsoft.com/products/
    7. Trojan Killer Review: https://howtofix.guide/trojan-killer-2020-review/

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    About the author

    Brendan Smith

    Journalist, researcher, web content developer, grant proposal editor. Efficient and proficient on multiple platforms and in diverse media. Computer technology and security are my specialties.

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