DOYUK 7.1 Virus 🔐 (.DOYUK Files) — How to Remove?

Written by Brendan Smith
The Doyuk 7.1 virus falls within the ransomware type of infection. A harmful program of this type encrypts all the data on your PC (images, text files, excel sheets, music, videos, etc) and adds its specific extension to every file, creating the Restore Your Files.txt text files in each folder which contains the encrypted files.
GridinSoft Anti-Malware Review
It is better to prevent, than repair and repent!
When we talk about the intrusion of unfamiliar programs into your computer’s work, the proverb “Forewarned is forearmed” describes the situation as accurately as possible. Gridinsoft Anti-Malware is exactly the tool that is always useful to have in your armory: fast, efficient, up-to-date. It is appropriate to use it as an emergency help at the slightest suspicion of infection.
Gridinsoft Anti-Malware 6-day trial available.
EULA | Privacy Policy | 10% Off Coupon
Subscribe to our Telegram channel to be the first to know about news and our exclusive materials on information security.

What is known about the Doyuk 7.1virus?

☝️ A strictly accurate description for the Doyuk 7.1 would be “a ransomware malicious agent”.

Doyuk 7.1 appends its extra .doyuk extension to every file’s title. For example, an image named “photo.jpg” will be turned into “photo.jpg.doyuk”. Likewise, the Excel file with the name “table.xlsx” will end up as “table.xlsx.doyuk”, and so on.

In each folder with the encoded files, a Restore Your Files.txt text file will appear. It is a ransom money memo. It contains information on the ways of paying the ransom and some other information. The ransom note usually contains instructions on how to buy the decryption tool from the tamperers. That is it.

Doyuk 7.1 overview:
Name Doyuk 7.1 Virus
Extension .doyuk
Ransomware note Restore Your Files.txt
Detection Ransom:Win32/StopCrypt.SC!MTB, Trojan:Win32/Zbot.SIBE15!MTB, Sf:Crypt-G [Trj]
Symptoms Your files (photos, videos, documents) have a .doyuk extension and you can’t open them.
Fix Tool See If Your System Has Been Affected by Doyuk 7.1 virus

In the screenshot below, you can see what a folder with files encrypted by the Doyuk 7.1 looks like. Each filename has the “.doyuk” extension appended to it.

Doyuk 7.1 Virus - encrypted .doyuk files

That is how encrypted “.doyuk” files look.

How did Doyuk 7.1 ransomware end up on my PC?

There are many possible ways of ransomware injection.

Nowadays, there are three most popular ways for malefactors to have the Doyuk 7.1 virus acting in your system. These are email spam, Trojan injection and peer file transfer.

If you open your mailbox and see letters that look like familiar notifications from utility services companies, delivery agencies like FedEx, web-access providers, and whatnot, but whose sender is unknown to you, beware of opening those emails. They are very likely to have a viral file enclosed in them. So it is even more dangerous to open any attachments that come with emails like these.

Another thing the hackers might try is a Trojan file model1. A Trojan is an object that infiltrates into your computer disguised as something else. Imagine, you download an installer for some program you want or an update for some program. However, what is unpacked reveals itself a harmful agent that compromises your data. Since the update wizard can have any title and any icon, you have to make sure that you can trust the resource of the stuff you’re downloading. The best way is to use the software companies’ official websites.

As for the peer networks like torrents or eMule, the danger is that they are even more trust-based than the rest of the Internet. You can never guess what you download until you get it. So you’d better be using trustworthy resources. Also, it is reasonable to scan the folder containing the downloaded objects with the anti-malware utility as soon as the downloading is finished.

How do I get rid of the Doyuk 7.1 virus?

It is crucial to note that besides encrypting your data, the Doyuk 7.1 virus will most likely deploy the Azorult Spyware on your computer to seize your credentials to different accounts (including cryptocurrency wallets). The mentioned spyware2 can extract your credentials from your browser’s auto-filling cardfile.

Sometimes tamperers would decode several of your files so you know that they do have the decryption program. As Doyuk 7.1 virus is a relatively recent ransomware, anti-malware engineers have not yet found a method to undo its work. However, the decryption instruments are frequently updated, so the effective countermeasure may soon be available.

Of course, if the malefactors do the job of encoding someone’s critical files, the desperate person will probably fulfill their demands. However, paying to criminals gives no guarantee that you’re getting your files back. It is still risky. After obtaining the money, the racketeers may send a wrong decryption key to the injured party. There were reports about criminals just vanishing after getting the ransom without even bothering to reply.

The best solution against ransomware is to have a system restore point or the copies of your critical files in the cloud disk or at least on an external storage. Obviously, that might be insufficient. Your most important thing could be that one you were working upon when it all started. But at least it is something. It is also wise to scan your PC for viruses with the anti-malware utility after the OS is rolled back.

Doyuk 7.1 is not the only ransomware of its kind, since there are other specimens of ransomware out there that act in the same manner. For instance, Qqmt, Qqlo, Oovb, and some others. The two main differences between them and the Doyuk 7.1 are the ransom amount and the method of encryption. The rest is almost identical: files become inaccessible, their extensions altered, ransom notes are created in every folder containing encrypted files.

Some lucky people were able to decrypt the arrested files with the aid of the free tools provided by anti-ransomware experts. Sometimes the criminals mistakenly send the decoding key to the wronged in the ransom note. Such an extraordinary fail allows the injured part to restore the files. But naturally, one should never expect such a chance. Make no mistake, ransomware is a tamperers’ technology to pull the money out of their victims.

How do I avoid ransomware infiltration?

Doyuk 7.1 ransomware has no endless power, neither does any similar malware.

You can protect your PC from ransomware infiltration in several easy steps:

  • Never open any emails from unknown senders with unknown addresses, or with content that has likely no connection to something you are waiting for (can you win in a lottery without even taking part in it?). If the email subject is likely something you are expecting, scrutinize all elements of the suspicious letter carefully. A fake email will always have mistakes.
  • Avoid using cracked or untrusted software. Trojans are often spreaded as an element of cracked software, most likely as a “patch” which prevents the license check. But untrusted programs are very hard to tell from trustworthy ones, because trojans may also have the functionality you seek. Try searching for information on this software product on the anti-malware forums, but the best solution is not to use such programs at all.
  • And to be sure about the safety of the objects you downloaded, check them with GridinSoft Anti-Malware. This program will be a perfect defense for your system.
Reasons why I would recommend GridinSoft3

There is no better way to recognize, remove and prevent ransomware than to use an anti-malware software from GridinSoft4.

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 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

Press “Install” button.

GridinSoft Anti-Malware Install

Once installed, Anti-Malware will automatically run.

GridinSoft Anti-Malware Splash-Screen

Wait for the Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your PC for Doyuk 7.1 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

Click on “Clean Now”.

When the scan has finished, 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


🤔 How can I open “.doyuk” files?Is it possible to open“.doyuk” files?

Negative. That is why ransomware is so frustrating. Until you decode the “.doyuk” files you will not be able to access them.

🤔 What should I do to make my files accessible as fast as possible?

It’s good if you have fаr-sightedly saved copies of these important files elsewhere. Otherwise, you might try to employ System Restore. The only question is whether you have saved any Restore Points that would be helpful now. All other solutions require time.

🤔 Will GridinSoft Anti-Malware remove all the encrypted files alongside the Doyuk 7.1 virus?

Of course not. The encrypted files are not harmful, so they won’t be deleted.

GridinSoft Anti-Malware only deals with actual threats. The malware that has infiltrated your device is probably still functional and it scans your system from time to time to encode any new files you might create on your computer after the infection. As it has already been said, the Doyuk 7.1 ransomware does not come alone. It installs backdoors and keyloggers that can take your account passwords by trespass and provide malefactors with easy access to your computer after some time.

🤔 What should I do if the Doyuk 7.1 virus has blocked my PC and I can’t get the activation key.

If that happened, you need to prepare a memory stick with a previously installed Trojan Killer. Use Safe Mode to perform the procedure. You see, the ransomware starts automatically as the system boots and encrypts any new files created or imported into your system. To stop this function – use Safe Mode, which allows only the vital programs to run upon system boot. Consider reading our manual on running Windows in Safe Mode.

🤔 What could help the situation right now?

Some of the blocked files can be located elsewhere.

  • If you sent or received your critical files via email, you could still download them from your online mailbox.
  • You might have shared photographs or videos with your friends or family members. Just ask them to post those pictures back to you.
  • If you have initially downloaded any of your files from the Web, you can try to do it again.
  • Your messengers, social networks pages, and cloud storage might have all those files too.
  • Maybe you still have the needed files on your old computer, a notebook, cellphone, memory stick, etc.

HINT: You can use file recovery programs5 to get your lost data back since ransomware arrests the copies of your files, removing the original ones. In the video below, you can learn how to use PhotoRec for such a restoration, but remember: you won’t be able to do it before you eradicate the ransomware itself with an antivirus program.

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

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

I need your help to share this article.

It is your turn to help other people. I have written this guide 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
How to Remove DOYUK 7.1 Ransomware & Recover PC

Name: DOYUK 7.1 Virus

Description: DOYUK 7.1 Virus is a ransomware-type infections. This virus encrypts important personal files (video, photos, documents). The encrypted files can be tracked by a specific .doyuk extension. So, you can't use them at all.

Operating System: Windows

Application Category: Virus

User Review
3.83 (12 votes)
Comments Rating 0 (0 reviews)


  1. You can read more on Trojans, their use and types in the Trojan-dedicated section of GridinSoft official website.
  2. You can read more on spyware variants and nature in the respective section of GridinSoft official website.
  3. GridinSoft Anti-Malware Review from HowToFix site:
  4. More information about GridinSoft products:
  5. Here are Top 10 Data Recovery Software Of 2023.

About the author

Brendan Smith

I'm Brendan Smith, a passionate journalist, researcher, and web content developer. With a keen interest in computer technology and security, I specialize in delivering high-quality content that educates and empowers readers in navigating the digital landscape.

With a focus on computer technology and security, I am committed to sharing my knowledge and insights to help individuals and organizations protect themselves in the digital age. My expertise in cybersecurity principles, data privacy, and best practices allows me to provide practical tips and advice that readers can implement to enhance their online security.

Leave a Reply