The Gatq 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 “.gatq” extension. It uses a strong encryption method, which makes it impossible to calculate the key in any way.
Gatq uses a unique key for each victim, with one exception:
- If Gatq 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.
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I have gathered a complete collection of all possible solutions, tips and practices in neutralizing the Gatq 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 .gatq 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.
☝️ Gatq can be correctly identified as a STOP/DJVU ransomware infection.
🤔 The Gatq virus is a ransomware that originates from the DJVU/STOP family. Its primary purpose is to encrypt files that are important to you. After encrypting the files, the ransomware virus asks its victims for a ransom fee ranging from $490 to $980 in Bitcoin.
The Gatq ransomware is a specific kind of threat that encrypted your files and then forces you to pay for them. Note that Djvu/STOP ransomware family was first revealed and analyzed by virus analyst Michael Gillespie.
Gatq virus is basically similar to other representatives of DJVU ransomware like: Gaze, Gapo, Xaro. This virus encrypt all common file types and adds its particular “.gatq” extension into all files. For instance, the file “1.jpg”, will be amended into “1.jpg.gatq“. As soon as the encryption is successfully accomplished, virus creates a specific message file “_readme.txt” and drop it into all folders that contain the modified files.
The image below gives a clear vision of how the files with “.gatq” extension look like:
|Ransomware family1||DJVU/STOP2 ransomware|
|Ransom||From $490 to $980 (in Bitcoins)|
|Detection3||Injector.Trojan.MSIL.DDS, MSIL:Crypt-AH [Drp], CDEject.Trojan.CDEjector.DDS|
|Fix Tool|| To remove possible malware infections, scan your PC:|
6-day free trial available.
This _readme.txt file asking payment is for restore files via decryption key:
Gatq ransomware arrives on a victim’s computer as a set of processes that perform different tasks. One of the first processes launched is
winupdate.exe, which displays a fake Windows update prompt during the attack. This process is meant to convince the victim that a sudden system slowdown is caused by a Windows update. Meanwhile, the ransomware initiates another process (usually named with four random characters) that scans the system for target files and encrypts them. Next, the ransomware deletes Volume Shadow Copies from the system using the following CMD command:
vssadmin.exe Delete Shadows /All /Quiet
Once deleted, it becomes impossible to restore the previous computer state using System Restore Points. The thing is, ransomware operators are getting rid of any Windows OS-based methods that could help the victim restore files for free. Additionally, the crooks modify the Windows HOSTS file by adding a list of domains to it and mapping them to the localhost IP. As a result, the victim will encounter a DNS_PROBE_FINISHED_NXDOMAIN error when attempting to access one of the blocked websites.
We have observed that the ransomware attempts to block websites that publish various how-to guides for computer users. It is evident that by restricting specific domains, the crooks are trying to prevent the victim from accessing relevant and helpful information about ransomware attacks online. The virus also saves two text files on the victim’s computer that provide attack-related details: the victim’s public encryption key and personal ID. These two files are named bowsakkdestx.txt and PersonalID.txt.
Malware doesn’t stop after making all these modifications. Variants of STOP/DJVU tend to drop password-stealing trojans like Vidar Stealer or RedLine Stealer. These threats have a lengthy list of capabilities, including:
- Stealing Steam, Telegram, Skype login/password
- Stealing cryptocurrency wallets
- Downloading malware to the computer and running it
- Stealing browser cookies, saved passwords, browsing history, and more
- Viewing and manipulating files on the victim’s computer
- Allowing hackers to perform other tasks on the victim’s computer remotely
The DJVU/STOP ransomware uses the AES-256 cryptography algorithm. If your data gets encrypted with an online decryption key, which is completely unique, it becomes impossible to decrypt files without that unique key.
If Gatq worked in online mode, you cannot gain access to the AES-256 key. The key is stored on a remote server owned by the criminals who distribute the Gatq infection.
To receive the decryption key, you need to make a payment of $980. The message encourages victims to contact the frauds via email (firstname.lastname@example.org) to obtain the payment details.
The message by the ransomware states the following information:
ATTENTION! Don't worry, you can return all your files! All your files like photos, databases, documents and other important are encrypted with strongest encryption and unique key. The only method of recovering files is to purchase decrypt tool and unique key for you. This software will decrypt all your encrypted files. What guarantees you have? You can send one of your encrypted file from your PC and we decrypt it for free. But we can decrypt only 1 file for free. File must not contain valuable information. You can get and look video overview decrypt tool: https://we.tl/t-WJa63R98Ku Price of private key and decrypt software is $980. Discount 50% available if you contact us first 72 hours, that's 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 answer more than 6 hours. To get this software you need write on our e-mail: email@example.com Reserve e-mail address to contact us: firstname.lastname@example.org Your personal ID: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Do not pay for Gatq!
Please, try to use the available backups, or Decrypter tool
The _readme.txt file also indicates that the computer owners must contact the Gatq representatives within 72 hours from the moment the files were encrypted. If users get in touch within 72 hours, we will grant them a 50% rebate, minimizing the ransom amount to $490. However, you should avoid paying the ransom!
I strongly advise you not to contact these crooks and not to pay. One of the most effective solutions to recover the lost data is to use the available backups or use the Decrypter tool here.
All such viruses have a peculiarity: they apply a similar set of actions to generate the unique decryption key required to recover the ciphered data.
Thus, unless the ransomware is still under development or has some hard-to-track flaws, you can’t manually recover the ciphered data. The only solution to prevent the loss of your valuable data is to regularly back up your crucial files.
Note that even if you regularly maintain such backups, you should store them in a specific location separate from your main workstation.
For instance, you can keep the backup on a USB flash drive or some alternative external hard drive storage. Optionally, you can also use online (cloud) information storage services.
It’s important to mention that if you store your backup data on your main device, it may be similarly ciphered like other data.
For this reason, keeping the backup on your main PC is definitely not a good idea.
How I was infected?
Ransomware has a various methods to built into your system. But it doesn’t really matter what method was used in your case.
Gatq 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 Gatq 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 Gatq ransomware manually, by actually making you directly participate in this process.
Surely, the bogus update alert will not indicate that you are going to actually 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 can inject serious malware, including the Gatq ransomware.
To sum up, what can you do to avoid the injection of the Gatq ransomware into your device? Although there is no 100% guarantee to prevent your PC from getting damaged, I want to give you certain tips to prevent Gatq from penetrating. You must be cautious while installing free software today.
Always make sure to read what the installers offer in addition to the main free program. Stay away from opening dubious email attachments and avoid opening files from unknown senders. Keep your current security program updated at all times.
The malware doesn’t openly disclose itself. It won’t be mentioned in the list of your available programs. However, it will be masked under some malicious process that runs regularly in the background, starting from the moment you launch your computer.
How To Remove Gatq Virus?
In addition to encode a victim’s files, the Gatq 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.
Download Removal Tool.
You can download GridinSoft Anti-Malware by clicking the button below:
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 system.
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.
Press “Install” button.
Once installed, Anti-Malware will automatically run.
Wait for complete.
GridinSoft Anti-Malware will automatically start scanning your system for Gatq 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.
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.
Trojan Killer for special instances
In some certain instances, Gatq 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 .gatq Files?
Restore solution for big “.gatq files“
Try removing .gatq extension on a few BIG files and opening them. Either the Gatq virus 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 Xatz, Xash, Gatz, 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.
You can download free decryption tool here: Decryptor for STOP Djvu.
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:
As soon as you accept the license terms, the main decryptor user interface comes up:
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.
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:
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 gatq files:
✓ Error: Unable to decrypt file with ID: [your ID]
✓ No key for New Variant online ID: [your ID]
Notice: this ID appears to be an online ID, decryption is impossible
✓ Result: No key for new variant offline ID: [example ID]
This ID appears be an offline ID. Decryption may be possible 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
How to Restore .gatq Files?
In some case Gatq ransomware is not doom for your files…
Gatq 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 information of the file location 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.
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 started going 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
Recovering your files with PhotoRec
PhotoRec is an open-source program, which is originally 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 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.
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.
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.
Then, you need to specify the file formats. This option is located at the bottom, too. As it was mentioned, PhotoRec can recover the files of about 400 different formats.
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.
Gatq files recovery guide
Frequently Asked Questions
🤔 How can I open “.gatq” files?
No way. These files are modified by ransomware. The contents of .gatq files are not available until they are decrypted.
🤔 Gatq files contain important information. How can I decrypt them urgently?
If your data remained in the .gatq files are very valuable, then most likely you 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 Gatq. 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) often.
🤔 Gatq 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 version of STOP/DJVU ransomware, and decryption keys have not yet been released. Follow the news on our website.
We will keep you posted on when new Gatq keys or new decryption programs appear.
🤔 What can I do right now?
The Gatq ransomware encrypts only the first 150KB of files. So MP3 files are rather large, some media players (Winamp for example) may be able to 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 just 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.
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.
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 Gatq infection, 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 users like you. You can use buttons below to share this on your favorite social media Facebook, Twitter, or Reddit.Brendan Smith
GATQ Ransomware — How To Restore & Decrypt Files?
Name: GATQ Virus
Description: GATQ 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 gatq extension. So, you can't use them at all after that GATQ ransomware asks victims for a ransom fee ($490 - $980) in Bitcoin.
Operating System: Windows
Application Category: Virus
User Review( votes)
- My files are encrypted by ransomware, what should I do now?
- About DJVU (STOP) Ransomware.
- Encyclopedia of threats.
- Windows passwords vulnerability (Mimikatz HackTool): link
- GridinSoft Anti-Malware Review: link
- More information about GridinSoft products: https://gridinsoft.com
- Trojan Killer Review: https://howtofix.guide/trojan-killer/
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