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Cossy ransomware. How to remove? (Uninstall guide)

removal by Julie Splinters - - | Type: Ransomware

Cossy ransomware – a Russian file locking virus which uses the RSA-2048 code to encrypt data

Cossy ransomware
Cossy ransomware is a file locking cyber threat which encrypts important documents by using the RSA-2048 encryption algorithm.

Cossy ransomware is a Russian cryptolocker which uses a unique encryption code to block various documents that are stored on the infected computer. This cyber threat uses RSA-2048 encryption[1] and ads the .Защищено RSA-2048 and .Protected by RSA-2048 appendixes to most of the files, while executables appear with the .lnk.Protected by RSA-2048 extension added. Moreover, Cossy virus brings a file named Cossy.exe from which you can spot the infection. As we can see from the ransom note, this dangerous cryptovirus is mostly targeting Russian-speaking users as the message is written in the Russian language. The crooks have been offering five small files for free decryption and urging for 50 rubles in BTC as the ransom price. After the money is received, they promise to send the decryption tool, however, such promises often appear to be false.

Name Cossy
Type Ransomware
Appendixes added .lnk.Protected by RSA-2048 – for executables, .Protected by RSA-2048 and .Защищено RSA-2048 – for other files
Encryption algorithm used RSA-2048
Target Russian speakers
Ransom price 50 rubles in BTC
Given email grafimatriux72224733@protonmail.com
Distribution Spam messages and their attachments, rogue links, and files, etc.
Removal Delete the virus automatically. Use Reimage to detect malware content 

Here is the Cossy ransomware ransom message translated into the English language:

Hello dear friend! Yes, I’m a mean greedy but I have to say it … 
forgive … 
but ……. 
all your files ___ 
SAFE! 1 !! 11 !! 11! 1: DDDDDDDDD 
Algorithm RSA! 2048 bits! 4096 too lazy! 
It is based on primes it. 
I'll tell you just now. 
Write to grafimatriux72224733@protonmail.com . 
We provide: Free transcript. Paid decryption (and Contractual decryption) * 
Contractual decryption is if you have old-time files that have been saved for many years, the decoder is provided free of charge.
Paid decryption costs – 50 rubles in bitcoins, the wallet will be made unique for you. * 
You can decrypt 5 files with a size of 5 MB or less for free. 
I will not kid you, + give when paying tips to improve the security and deciphering instructions. ” 
* – Services provided to us if you write a letter to the file is extremely important infa.RSA-2048 File

The crooks provide grafimatriux72224733@protonmail.com email address as a way to show contact. However, we advise avoiding any relations with the cybercriminals as these people cannot be trusted. Furthermore, you should remove Cossy virus from the computer system permanently. For this purpose, use reliable anti-malware software only. Additionally, we suggest downloading and installing a tool such as Reimage to detect all malware-laden content that might be secretly hidden.

Cossy ransomware removal is necessary if wanted to avoid possible damaging consequences. Such cyber threats are capable of many things. For example, modifying the Windows operating system[2] and adding rogue components to it. Furthermore, the ransomware virus can inject dubious entries straight into the Registry. Such changes let the damaging virus to perform its activities and activate the encryption process.

Additionally, Cossy ransomware can inject other malware-related programs, one of which might be a Trojan horse[3] infection. Once your computer is infected with ransomware, its security level decreases and other infections become more capable of entering the system unnoticed. Furthermore, in some case, a ransomware infection can relate in the deactivation of antivirus or firewall security programs. This means, that the virus can operate without being caught.

One more thing you need to know about ransomware viruses is that these threats can encrypt that data which is stored only on the infected computer. Note that, if you decide to keep valuable documents on a remote server, the viruses such as Cossy ransomware will not be able to reach it, unless you keep it plugged often. So, better get rid of the ransomware as soon as you spot encrypted files and manage to take care of your information next time.

Ransomware distribution techniques

According to malware experts,[4] if a ransomware infection has entered your computer system, it can have happened in a few ways. Ransomware viruses are capable of spreading via spam messages and their rogue files, malicious links from third-party websites. Good news, you can avoid this malware, however, you will need to take some actions of your own:

  • Avoid opening unknown emails, especially, their rogue attachments. Crooks often drop malware-laden email messages straight to the victims' email boxes. So, be careful while opening emails, make sure they come from recognizable senders.
  • Stay away from secondary websites. These pages, especially P2P networks, can lack required protections and include malicious links or files. If you accidentally access such content, your computer system can easily get infected with a ransomware virus.
  • Install computer security. Do not be afraid to invest in a reliable antivirus tool. These automatical programs are capable of protecting the system from malicious programs and various computer-related issues.

Get rid of Cossy virus

If the ransomware infection has appeared on your computer, make sure that you get rid of it ASAP. We recommend using a tool such as Reimage, Malwarebytes MalwarebytesCombo Cleaner, or Plumbytes Anti-MalwareMalwarebytes Malwarebytes to detect all components that are related to the cyber threat. Once you remove Cossy virus, make sure that all virus-related content was eliminated successfully. Furthermore, you can perform system backups to disable all active components.

Performing the Cossy ransomware removal requires lots of the user's attention. This is the main reason why the cyber threat cannot be removed manually. If you decide to eliminate the ransomware virus on your own, you can cause even more damage for your computer system or miss some rogue components that might be secretly hidden. Additionally, take a look at our below-provided data recovery steps.

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What to do if failed?
If you failed to remove virus damage using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to remove virus damage. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with Malwarebytes.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with Combo Cleaner.

To remove Cossy virus, follow these steps:

Remove Cossy using Safe Mode with Networking

Use Safe Mode with Networking to disable the ransomware virus on your computer:

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove Cossy

    Log in to your infected account and start the browser. Download Reimage or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete Cossy removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove Cossy using System Restore

Activate the System Restore feature by following these instructions and disable the dangerous activities:

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of Cossy. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage and make sure that Cossy removal is performed successfully.

Bonus: Recover your data

Guide which is presented above is supposed to help you remove Cossy from your computer. To recover your encrypted files, we recommend using a detailed guide prepared by 2-spyware.com security experts.

You can recover files encrypted by Cossy ransomware by looking thru the below-given data recovery methods. Make sure you choose the most suitable option and complete each step as required.

If your files are encrypted by Cossy, you can use several methods to restore them:

Using Windows Previous Versions feature might allow you to restore some files:

If you have activated the System Restore feature in the past, this method might appear to be very useful.

  • Find an encrypted file you need to restore and right-click on it;
  • Select “Properties” and go to “Previous versions” tab;
  • Here, check each of available copies of the file in “Folder versions”. You should select the version you want to recover and click “Restore”.

Shadow Explorer might be helpful for data restoring:

Note that, this method might work only under one condition. You need to ensure that the ransomware virus did not eliminate Shadow Volume Copies of encrypted files.

  • Download Shadow Explorer (http://shadowexplorer.com/);
  • Follow a Shadow Explorer Setup Wizard and install this application on your computer;
  • Launch the program and go through the drop down menu on the top left corner to select the disk of your encrypted data. Check what folders are there;
  • Right-click on the folder you want to restore and select “Export”. You can also select where you want it to be stored.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Cossy and other ransomwares, use a reputable anti-spyware, such as Reimage, Malwarebytes MalwarebytesCombo Cleaner or Plumbytes Anti-MalwareMalwarebytes Malwarebytes

About the author

Julie Splinters
Julie Splinters - Malware removal specialist

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References

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