CURSODFIR Ransomware 🔐 (.CURSODFIR File) — Removal Guide

Written by Brendan Smith

The Cursodfir virus belongs to the ransomware type of infection. Ransomware of such sort encrypts all the data on your PC (images, documents, excel sheets, audio files, videos, etc) and appends its specific extension to every file, leaving the meleaicara.txt files in every directory which contains the encrypted files.

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Cursodfir virus: what is known so far?

Cursodfir adds its own .cursoDFIR extension to every file’s name. For example, a file entitled “photo.jpg” will be altered to “photo.jpg.cursoDFIR”. Just like the Excel table named “table.xlsx” will become “table.xlsx.cursoDFIR”, and so on.

In every folder containing the encoded files, a meleaicara.txt text file will be created. It is a ransom money memo. It contains information about the ways of paying the ransom and some other information. The ransom note most probably contains a description of how to buy the decryption tool from the tamperers. That is it.

Cursodfir Summary:

Name Cursodfir Virus
Extension .cursoDFIR
Ransomware note meleaicara.txt
Detection Trojan:Win32/Virtumonde.O Virus Removal, TrojanRansom.Stealc Virus Removal, Trojan:Win32/Inject.AL Virus Removal
Symptoms Your files (photos, videos, documents) get a .cursoDFIR extension and you can’t open them.
Fix Tool See If Your System Has Been Affected by Cursodfir virus

The meleaicara.txt file accompanying the Cursodfir ransomware states the following:

**************** ESTE RANSOMWARE FOI PARA VOCÊ! ***********************

É VOCÊ MESMO QUE TENTOU BAIXAR UM MICROSOFT PIRATA!

PARA DESCRIPTOGRAFAR PRECISA PAGAR

PAGAR 1 MOEDA DIGITAL

Key: EC63E8BE0717BD92C0FFBF7A21749A54

********************** CURSO DE DFIR Mente Binária *************************
Professor: Caique

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

Cursodfir Virus - encrypted .cursoDFIR files

An example of encrypted .cursoDFIR files.

How did my computer get infected with Cursodfir ransomware?

There are plenty of possible ways of ransomware injection.

There are currently three most exploited methods for criminals to have ransomware planted in your digital environment. These are email spam, Trojan injection and peer-to-peer file transfer.

  • If you access your mailbox and see emails that look just like notifications from utility services providers, delivery agencies like FedEx, Internet providers, and whatnot, but whose addresser is strange to you, beware of opening those emails. They are most likely to have a malicious item enclosed in them. Thus it is even more dangerous to open any attachments that come with letters like these.
  • Another option for ransom hunters is a Trojan virus scheme. A Trojan is a program that gets into your PC disguised as something different. For instance, you download an installer of some program you want or an update for some service. But what is unpacked turns out to be a harmful program that compromises your data. Since the update package can have any name and any icon, you’d better be sure that you can trust the resource of the stuff you’re downloading. The best way is to trust the software developers’ official websites.
  • As for the peer networks like torrents or eMule, the threat is that they are even more trust-based than the rest of the Web. You can never guess what you download until you get it. So you’d better be using trustworthy websites. Also, it is reasonable to scan the directory containing the downloaded items with the antivirus as soon as the downloading is finished.

How to remove ransomware?

It is important to inform you that besides encrypting your files, the Cursodfir virus will most likely deploy Vidar Stealer on your computer to get access to credentials to various accounts (including cryptocurrency wallets). The mentioned program can extract your logins and passwords from your browser’s auto-filling data.

Remove Cursodfir with Gridinsoft Anti-Malware

We have also been using this software on our systems ever since, and it has always been successful in detecting viruses. It has blocked the most common Ransomware as shown from our tests with the software, and we assure you that it can remove Cursodfir as well as other malware hiding on your computer.

Gridinsoft Anti-Malware - Main Screen

To use Gridinsoft for remove malicious threats, follow the steps below:

1. Begin by downloading Gridinsoft Anti-Malware, accessible via the blue button below or directly from the official website gridinsoft.com.

2.Once the Gridinsoft setup file (setup-gridinsoft-fix.exe) is downloaded, execute it by clicking on the file.

setup-gridinsoft-fix.exe

3.Follow the installation setup wizard's instructions diligently.

Gridinsoft Setup Wizard

4. Access the "Scan Tab" on the application's start screen and launch a comprehensive "Full Scan" to examine your entire computer. This inclusive scan encompasses the memory, startup items, the registry, services, drivers, and all files, ensuring that it detects malware hidden in all possible locations.

Scan for Cursodfir Ransomware

Be patient, as the scan duration depends on the number of files and your computer's hardware capabilities. Use this time to relax or attend to other tasks.

5. Upon completion, Anti-Malware will present a detailed report containing all the detected malicious items and threats on your PC.

The Cursodfir was Found

6. Select all the identified items from the report and confidently click the "Clean Now" button. This action will safely remove the malicious files from your computer, transferring them to the secure quarantine zone of the anti-malware program to prevent any further harmful actions.

The Cursodfir has been removed

8. If prompted, restart your computer to finalize the full system scan procedure. This step is crucial to ensure thorough removal of any remaining threats. After the restart, Gridinsoft Anti-Malware will open and display a message confirming the completion of the scan.

Remember Gridinsoft offers a 6-day free trial. This means you can take advantage of the trial period at no cost to experience the full benefits of the software and prevent any future malware infections on your system. Embrace this opportunity to fortify your computer's security without any financial commitment.

Trojan Killer for “Cursodfir” removal on locked PC

In situations where it becomes impossible to download antivirus applications directly onto the infected computer due to malware blocking access to websites, an alternative solution is to utilize the Trojan Killer application.

Trojan Killer - Main View

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. This term will definitely be 100% enough to wipe malware out.

Trojan Killer is a valuable tool in your cybersecurity arsenal, helping you to effectively remove malware from infected computers. Now, we will walk you through the process of using Trojan Killer from a USB flash drive to scan and remove malware on an infected PC. Remember, always obtain permission to scan and remove malware from a computer that you do not own.

Step 1: Download & Install Trojan Killer on a Clean Computer:

1. Go to the official GridinSoft website (gridinsoft.com) and download Trojan Killer to a computer that is not infected.

Download Trojan Killer

2. Insert a USB flash drive into this computer.

3. Install Trojan Killer to the "removable drive" following the on-screen instructions.

Install Trojan Killer to Removable Drive

4. Once the installation is complete, launch Trojan Killer.

Step 2: Update Signature Databases:

5. After launching Trojan Killer, ensure that your computer is connected to the Internet.

6. Click "Update" icon to download the latest signature databases, which will ensure the tool can detect the most recent threats.

Click Update Button

Step 3: Scan the Infected PC:

7. Safely eject the USB flash drive from the clean computer.

8. Boot the infected computer to the Safe Mode.

9. Insert the USB flash drive.

10. Run tk.exe

11. Once the program is open, click on "Full Scan" to begin the malware scanning process.

Searching Cursodfir Virus

Step 4: Remove Found Threats:

12. After the scan is complete, Trojan Killer will display a list of detected threats.

Searching Cursodfir Finished

13. Click on "Cure PC!" to remove the identified malware from the infected PC.

14. Follow any additional on-screen prompts to complete the removal process.

Restart needed

Step 5: Restart Your Computer:

15. Once the threats are removed, click on "Restart PC" to reboot your computer.

16. Remove the USB flash drive from the infected computer.

Congratulations on effectively removing Cursodfir and the concealed threats from your computer! You can now have peace of mind, knowing that they won't resurface again. Thanks to Gridinsoft's capabilities and commitment to cybersecurity, your system is now protected.

Sometimes racketeers would decrypt several of your files so you know that they indeed have the decryption tool. Since Cursodfir virus is a relatively recent ransomware, safety measures developers have not yet found a way to undo its work. However, the anti-ransomware instruments are frequently upgraded, so the effective countermeasure may soon arrive.

Sure thing, if the criminals do the job of encrypting someone’s essential data, the desperate person will probably comply with their demands. Nevertheless, paying a ransom gives no guarantee that you’re getting your files back. It is still dangerous. After getting the ransom, the racketeers may send a wrong decryption code to the injured party. There were reports of criminals simply disappearing after getting the ransom without even writing back.

The best safety measure against ransomware is to have aan OS restore point or the copies of your essential files in the cloud drive or at least on an external storage. Surely, that might be insufficient. Your most important thing could be that file you were working on when it all happened. Nevertheless, it is something. It is also reasonable to scan your drives with the anti-malware utility after the system is rolled back.

Cursodfir 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 Ert, Vook, Looy, and some others. The two basic differences between them and the Cursodfir are the ransom amount and the method of encryption. The rest is almost identical: documents become encoded, their extensions altered, ransom notes are created in each directory containing encoded files.

Some lucky victims were able to decode the blocked files with the aid of the free software provided by anti-malware specialists. Sometimes the hackers accidentally send the decoding code to the victims in the ransom readme. Such an extraordinary fail allows the user to restore the files. But naturally, one should never expect such a chance. Remember, ransomware is a tamperers’ tool to lay their hands on the money of their victims.

How сan I avert ransomware injection?

Cursodfir ransomware doesn’t have a superpower, neither does any similar malware.

You can defend yourself from its infiltration within three easy steps:

  • Ignore any emails from unknown mailers with unknown addresses, or with content that has likely no connection to something you are expecting (can you win in a lottery without even taking part in it?). If the email subject is likely something you are waiting for, check all elements of the suspicious email carefully. A hoax letter will surely contain a mistake.
  • Do not use cracked or untrusted software. Trojans are often shared as an element of cracked products, possibly under the guise of “patch” to prevent the license check. Understandably, dubious programs are difficult to tell from reliable software, because trojans sometimes have the functionality you seek. You can try to find information on this program on the anti-malware message boards, but the optimal solution is not to use such software.
  • And to be sure about the safety of the files you downloaded, use GridinSoft Anti-Malware. This software will be a powerful shield for your personal computer.

Frequently Asked Questions

🤔 How can I open “.cursoDFIR” files?Are the “.cursoDFIR” files accessible?

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

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

If the “.cursoDFIR” files contain some really important information, then you probably have them backed up. If not, there is still a function of System Restore but it needs a Restore Point to be previously saved. The rest of the methods require patience.

🤔 If GridinSoft deletes the Cursodfir malware, will it also delete my files that were encrypted?

Absolutely not! Your encrypted files are no threat to your PC.

GridinSoft Anti-Malware will remove active infections from your computer. The malware that has attacked your system is probably still functional and it scans your system periodically to encrypt any new files you might create on your computer after the initial attack. As it has been mentioned above, the Cursodfir virus comes with the company. It installs backdoors and keyloggers that can take your account passwords by trespass and provide malefactors with easy access to your PC after some time.

🤔 What to do if the Cursodfir ransomware has blocked my computer and I can’t get the activation key.

In such a case, you need to have a flash memory drive with a pre-installed Trojan Killer. Use Safe Mode to perform the cleaning. You see, the ransomware starts automatically as the system boots and encodes any new files created or brought into your system. To block this process – use Safe Mode, which allows only the vital applications to run upon system start. Consider reading our manual on booting Windows in Safe Mode.

🤔 What can I do right now?

Many of the blocked files might still be at your disposal

  • If you exchanged your important files through email, you could still download them from your online mail server.
  • You might have shared photographs or videos with your friends or relatives. Simply ask them to post those images back to you.
  • If you have initially got any of your files from the Internet, you can try doing it again.
  • Your messengers, social media pages, and cloud storage might have all those files as well.
  • It might be that you still have the needed files on your old computer, a laptop, cellphone, memory stick, etc.

USEFUL TIP: You can use file recovery programs1 to retrieve your lost information since ransomware arrests the copies of your files, removing the authentic ones. In the tutorial 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 virus with an anti-malware program.

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References

  1. Here are Best Data Recovery Software Of 2024.

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.

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