UDAIGEN Virus 🔐 (.JCRYPT Files) udai@membermail.net

Written by Brendan Smith
The Udaigen virus falls under the ransomware type of malicious agent. Ransomware of this type encrypts all user’s data on the computer (images, text files, excel sheets, audio files, videos, etc) and adds its specific extension to every file, creating the ___RECOVER__FILES__.jcrypt.txt files in each directory 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.

Udaigen virus: what is known so far?

☝️ A scientifically correct description for the Udaigen is “a ransomware-type infection”.

Udaigen will append its specific .jcrypt extension to every file’s name. For instance, an image entitled “photo.jpg” will be altered to “photo.jpg.jcrypt”. Just like the Excel sheet named “table.xlsx” will be renamed to “table.xlsx.jcrypt”, and so forth.

In each folder containing the encrypted files, a ___RECOVER__FILES__.jcrypt.txt file will be created. It is a ransom money note. It contains information about the ways of contacting the racketeers and some other remarks. The ransom note usually contains a description of how to buy the decryption tool from the ransomware developers. You can get this decryptor after contacting udai@membermail.net via email. That is pretty much the scheme of the felony.

Udaigen summary:
NameUdaigen Virus
Ransomware note___RECOVER__FILES__.jcrypt.txt
Ransom2 BTC (Bitcoin)
DetectionWin32.Virlock.Gen.4, NSIS/Injector.MK, Generic.Trojan.Malicious.DDS
SymptomsYour files (photos, videos, documents) get a .jcrypt extension and you can’t open them.
Fix ToolSee If Your System Has Been Affected by Udaigen virus

The ___RECOVER__FILES__.jcrypt.txt document accompanying the Udaigen ransomware states the following:

All of your files have been encrypted.

To unlock them, please send 2 bitcoin(s) to BTC address: 35tNmAJqbWwPHGLZT15eQthyP7AwT1DNiv
Afterwards, please email your transaction ID to: udai@membermail.net

Being a lazy bit*h isn\'t going to get your files back.

In the picture below, you can see what a directory with files encrypted by the Udaigen looks like. Each filename has the “.jcrypt” extension appended to it.

Udaigen Virus - encrypted .jcrypt files

An example of encrypted .jcrypt files.

How did my machine catch Udaigen ransomware?

There are many possible ways of ransomware infiltration.

There are currently three most popular methods for criminals to have ransomware acting in your system. These are email spam, Trojan introduction and peer networks.

If you open your inbox and see emails that look like familiar notifications from utility services providers, delivery agencies like FedEx, web-access providers, and whatnot, but whose addresser is unknown to you, beware of opening those emails. They are very likely to have a ransomware file enclosed in them. Therefore, it is even riskier to open any attachments that come with emails like these.

Another thing the hackers might try is a Trojan file scheme. A Trojan is a program that gets into your PC disguised as something legal. For example, you download an installer of some program you want or an update for some service. But what is unboxed reveals itself a harmful agent that compromises your data. Since the installation file can have any name and any icon, you have to make sure that you can trust the resource of the things you’re downloading. The best way is to trust the software companies’ official websites.

As for the peer-to-peer file transfer protocols like torrents or eMule, the threat is that they are even more trust-based than the rest of the Internet. You can never know what you download until you get it. Our suggestion is that you use trustworthy websites. Also, it is reasonable to scan the directory containing the downloaded objects with the anti-malware utility as soon as the downloading is complete.

How do I get rid of the Udaigen virus?

It is important to inform you that besides encrypting your files, the Udaigen virus will most likely deploy Vidar Stealer on your machine to seize your credentials to different accounts (including cryptocurrency wallets). That program can derive your credentials from your browser’s auto-filling cardfile.

Sometimes racketeers would unblock several of your files so you know that they really have the decryption program. Since Udaigen virus is a relatively recent ransomware, security software designers have not yet found a method to undo its work. Nevertheless, the decryption tools are constantly updated, so the effective countermeasure may soon arrive.

Of course, if the evildoers do the job of encrypting victim’s critical data, the desperate person will probably fulfill their demands. Despite that, paying a ransom gives no guarantee that you’re getting your blocked information back. It is still dangerous. After receiving the money, the racketeers may deliver a wrong decryption code to the victim. There were reports about hackers just disappearing after getting the ransom without even writing back.

The optimal solution against ransomware is to have aan OS restore point or the copies of your essential files in the cloud disk or at least on an external drive. Surely, that might be insufficient. Your most crucial thing could be that one you were working on when it all went down. But at least it is something. It is also advisable to scan your PC for viruses with the antivirus program after the OS restoration.

Udaigen is not the only ransomware of its kind, since there are other specimens of ransomware out there that act in the same manner. Examples of those are Tgvv, Tgpo, Tghz, and some others. The two major differences between them and the Udaigen are the ransom amount and the encoding method. The rest is almost identical: files become inaccessible, their extensions altered, ransom notes are found in each folder containing encrypted files.

Some lucky people were able to decode the blocked files with the aid of the free software provided by anti-malware experts. Sometimes the racketeers mistakenly send the decoding key to the wronged in the ransom note. Such an extraordinary fail allows the victim to restore the files. But of course, one should never rely on such a chance. Make no mistake, ransomware is a bandits’ tool to pull the money out of their victims.

How сan I avert ransomware infiltration?

Udaigen ransomware doesn’t have a superpower, so as any similar malware.

You can armour your computer from ransomware injection in three easy steps:

  • Never open any emails from unknown senders with strange addresses, or with content that has nothing to do with something you are expecting (can you win in a lottery without participating in it?). In case the email subject is more or less something you are expecting, check all elements of the suspicious letter carefully. A fake email will surely contain a mistake.
  • Never use cracked or unknown software. Trojan viruses are often distributed as an element of cracked software, possibly under the guise of “patch” preventing the license check. But potentially dangerous programs are very hard to distinguish from reliable ones, because trojans sometimes have the functionality you need. You can try searching for information on this program on the anti-malware message boards, but the best way is not to use such programs at all.
  • And finally, to be sure about the safety of the files you downloaded, scan them with GridinSoft Anti-Malware. This program will be a powerful armor for your system.
Reasons why I would recommend GridinSoft1

There is no better way to recognize, remove and prevent ransomware than to use an anti-malware software from GridinSoft2.

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 Udaigen 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 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


🤔 How can I open “.jcrypt” files?Can I somehow access “.jcrypt” files?

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

🤔 I really need to decrypt those “.jcrypt” files ASAP. How can I do that?

If the “.jcrypt” files contain some really important information, then you probably have them backed up. In case you haven’t, there is still a chance that you do have a Restore Point from some time ago to roll back the whole system to the moment when it had no virus yet, but already had your files. All other solutions require time.

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

No way! Unlike the ransomware program itself, the encrypted files do not jeopardize your system.

With the help of GridinSoft Anti-Malware, you can clean your system off the actual viruses. The malware that has attacked your system is most likely still functional and it scans your system periodically to arrest any new files you might create on your computer after the attack. As it has been said above, the Udaigen virus comes with the company. It installs backdoors and keyloggers that can steal your account credentials and provide criminals with easy access to your system in the future.

🤔 What should I do if the Udaigen virus has blocked my computer and I can’t get the activation key.

If that happened, you need to have a flash memory card with a previously installed Trojan Killer. Use Safe Mode to perform the procedure. You see, the ransomware runs automatically as the system launches and encodes any new files created or brought into your computer. To block this function – use Safe Mode, which allows only the vital applications to run upon system start. Consider reading our manual on running Windows in Safe Mode.

🤔 And what should I do now?

Some of the encrypted files can be found elsewhere.

  • If you sent or received your critical files through email, you could still download them from your online mail server.
  • You might have shared images or videos with your friends or family members. Simply ask them to give those pictures back to you.
  • If you have initially got any of your files from the Web, you can try to do it again.
  • Your messengers, social networks pages, and cloud disks might have all those files as well.
  • It might be that you still have the needed files on your old PC, a laptop, mobile, external storage, etc.

HINT: You can use data recovery programs3 to retrieve your lost information since ransomware encrypts the copies of your files, deleting the authentic ones. In the tutorial below, you can learn how to use PhotoRec for such a restoration, but be advised: you can do it only after you kill 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 UDAIGEN Ransomware & Recover PC

Name: UDAIGEN Virus

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

Operating System: Windows

Application Category: Virus

User Review
4.3 (10 votes)
Comments Rating 0 (0 reviews)


  1. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
  2. More information about GridinSoft products: https://gridinsoft.com/comparison
  3. 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