COOPER Virus 🔐 (.COOPER Files) — How to Remove?

Written by Brendan Smith
Virus analyst Amigo-A was the person who, for the first time, recognized the Cooper virus, which belongs to the ransomware type of malicious agent. Ransomware of this type encrypts all the data on your computer (images, text files, excel tables, music, videos, etc) and appends its extra extension to every file, creating the Cooper_Recover.txt text files in every directory containing encrypted files.
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Cooper virus: what is known so far?

☝️ A strictly correct description for the Cooper would be “a ransomware infection”.

Cooper will append its specific .Cooper extension to the name of each encoded file. For example, an image entitled “photo.jpg” will be renamed to “photo.jpg.Cooper”. Just like the Excel table with the name “table.xlsx” will be altered to “table.xlsx.Cooper”, and so on.

In every folder that contains the encrypted files, a Cooper_Recover.txt file will be found. It is a ransom money memo. Therein you can find information about the ways of paying the ransom and some other information. The ransom note most probably contains instructions on how to purchase the decryption tool from the tamperers. You can obtain this tool after contacting [email protected], [email protected] via email. That is it.

Cooper overview:
Name Cooper Virus
Extension .Cooper
Ransomware note Cooper_Recover.txt
Contact [email protected], [email protected]
Detection Ransom:Win32/StopCrypt.SAK!MTB, Trojan:MSIL/Seraph.RG!MTB, Win32/GenKryptik.GIML
Symptoms Your files (photos, videos, documents) get a .Cooper extension and you can’t open them.
Fix Tool See If Your System Has Been Affected by Cooper virus

The Cooper_Recover.txt document coming in package with the Cooper malware provides the following dispiriting information:

Cooper Ransomware V2
Your ID: 999106C0F4B***
We are the only ones that own the decryption software. After you run it on your system, all of your data will be recovered and everything will be back to normal as if nothing had happened. 
As a result, we advise you to contact us at the following Email addresses and buy the decryption software RIGHT NOW:
[email protected]
[email protected]
** You Must Include Your ID in the Subject line of Your Email, Otherwise We WILL NOT ANSWER....

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

Cooper Virus - encrypted .Cooper files

That is how encrypted “.Cooper” files look.

How did my computer get infected with Cooper ransomware?

There is a huge number of possible ways of ransomware injection.

There are currently three most exploited ways for hackers to have the Cooper virus working in your digital environment. These are email spam, Trojan injection and peer networks.

If you open your inbox and see emails that look just like notifications from utility services companies, postal agencies like FedEx, Internet providers, and whatnot, but whose “from” field is unknown to you, be wary of opening those letters. They are very likely to have a viral item enclosed in them. Thus it is even more dangerous to download 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 gets into your PC pretending to be something different. Imagine, you download an installer for some program you need or an update for some program. But what is unboxed turns out to be a harmful program that corrupts your data. As the installation file 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 optimal way is to trust the software companies’ official websites.

As for the peer-to-peer networks like BitTorrent or eMule, the danger is that they are even more trust-based than the rest of the Web. You can never know what you download until you get it. Our suggestion is that you use trustworthy websites. Also, it is a good idea to scan the directory containing the downloaded items with the antivirus as soon as the downloading is complete.

How to remove the Cooper virus?

It is important to inform you that besides encrypting your data, the Cooper virus will probably deploy the Azorult Spyware on your computer to get access to credentials to different accounts (including cryptocurrency wallets). The mentioned spyware2 can extract your logins and passwords from your browser’s auto-filling data.

Often criminals would decrypt few of your files so you know that they really have the decryption program. Since Cooper virus is a relatively new ransomware, safety measures engineers have not yet found a way to reverse its work. Nevertheless, the anti-ransomware tools are frequently updated, so the effective countermeasure may soon be available.

Understandably, if the evildoers do the job of encoding someone’s essential data, the desperate person will most likely fulfill their demands. Despite that, paying a ransom gives no guarantee that you’re getting your data back. It is still dangerous. After obtaining the ransom, the racketeers may deliver a wrong decryption code to the victim. There were reports of ransomware developers just disappearing after getting the money without even bothering to reply.

The best countermeasure to ransomware is to have aan OS restore point or the copies of your critical files in the cloud storage or at least on an external drive. Surely, that might be not enough. Your most crucial thing could be that file you were working upon when it all started. But at least it is something. It is also reasonable to scan your PC for viruses with the anti-malware utility after the system restoration.

Cooper 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, Nitz, Nifr, Niwm, and some others. The two basic differences between them and the Cooper are the ransom amount and the method of encryption. The rest is the same: files become encoded, their extensions changed, ransom notes appear in each directory containing encrypted files.

Some fortunate victims were able to decrypt the blocked files with the help of the free tools provided by anti-malware specialists. Sometimes the racketeers accidentally send the decoding code to the wronged in the ransom readme. Such an extraordinary fail allows the user to restore the files. But of course, one should never rely on such a chance. Make no mistake, ransomware is a criminals’ instrument to pull the money out of their victims.

How to avoid ransomware infiltration?

Cooper ransomware has no superpower, so as any similar malware.

You can protect your computer from its infiltration within three easy steps:

  • Ignore any emails from unknown mailers with strange addresses, or with content that has likely no connection to something you are waiting for (can you win in a money prize draw without participating in it?). If the email subject is likely something you are waiting for, scrutinize all elements of the questionable letter with caution. A hoax letter will always have a mistake.
  • Avoid using cracked or unknown programs. Trojan viruses are often distributed as an element of cracked software, most likely as a “patch” to prevent the license check. But dubious programs are difficult to distinguish from reliable 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 way is not to use such software.
  • And to be sure about the safety of the files you downloaded, scan them with GridinSoft Anti-Malware. This program will be a powerful 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 system for Cooper 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

Frequently Asked Questions

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

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

🤔 The encrypted files are very important to me. How can I decrypt them quickly?

Hopefully, you have made a copy of those important files. If not, there is still a function of System Restore but it needs a Restore Point to be previously saved. There are other ways to beat ransomware, but they take time.

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

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

With the help of GridinSoft Anti-Malware, you can clean your computer off the actual threats. The ransomware that has attacked your computer is must be still active and it scans your system every so often to encrypt any new files you might create on your computer after the initial attack. As it has been mentioned above, the Cooper malware does not come alone. It installs backdoors and keyloggers that can steal your account credentials and provide hackers with easy access to your computer in the future.

🤔 What should I do if the Cooper ransomware has blocked my computer and I can’t get the activation code.

In such an unfortunate situation, you need to prepare a flash memory card with a previously installed Trojan Killer. Use Safe Mode to perform the procedure. The point is that the ransomware runs automatically as the system boots and encodes any new files created or brought into your machine. To block this process – use Safe Mode, which allows only the vital applications to run automatically. Consider reading our manual on booting Windows in Safe Mode.

🤔 What could help the situation right now?

Many of the blocked files might still be within your reach

  • If you exchanged your important files via email, you could still download them from your online mailbox.
  • You may have shared images or videos with your friends or family members. Just ask them to send those images back to you.
  • If you have initially downloaded any of your files from the Web, you can try doing it again.
  • Your messengers, social media pages, and cloud storage might have all those files too.
  • Maybe you still have the needed files on your old PC, a portable device, mobile, flash memory, etc.

HINT: You can employ data recovery programs5 to retrieve your lost information since ransomware blocks the copies of your files, removing the authentic 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 kill the virus with an anti-malware program.

Also, you can contact the following governmental 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.

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Brendan Smith
How to Remove COOPER Ransomware & Recover PC

Name: COOPER Virus

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

Operating System: Windows

Application Category: Virus

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References

  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: https://howtofix.guide/gridinsoft-anti-malware/
  4. More information about GridinSoft products: https://gridinsoft.com/products
  5. Here’s the list of Best 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.

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