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Remove Cosakos ransomware (Removal Guide) - Virus Decryption

removal by Linas Kiguolis - - | Type: Ransomware

Cosakos ransomware – a ransom-urging malware that can secretly bring AZORult trojan to the surface

Cosakos ransomware virusCosakos malware - a ransomware form that might relate in the injection of AZORult trojan

Cosakos is a ransomware virus that is related to the Djvu and STOP ransomware families. However, the most untypical act of this virus is that it can lead its victims to the installation of a Trojan horse named AZORult. After successful encryption, the virus appends .cosakos file extension to each locked component and displays the _readme.txt message. Ransom demands can vary from $490 to $980, depending on the time of contact. Victims are often lured into money swindling operations by transferring the demanded price while believing that the criminals will truly send the decryption tool for blocked files.

Name Cosakos
Type Ransomware
Family Djvu/STOP
Extension .cosakos
Note _readme.txt
Price $490/$980
Additional threat AZORult 
Promotion Email spam
Identification Reimage Reimage Cleaner Intego

Cosakos virus is a sneaky threat that enters the system with the help of spam messaging. This type of malware often initiates various malicious processes in the background. Sometimes, ransomware[1] erases Shadow Volume Copies of encrypted data so that the decryption process will be even harder to perform without their software.

However, you should not be afraid of the people who have launched Cosakos ransomware on your computer. The more the people fall for their tricks, the better it will be for the crooks. So instead of paying the demanded price, we offer to take a look at the end of this page and find other data recovery solutions that might appear to be really handy.

Note that Cosakos removal needs to come first before data decryption. If you do not fully get rid of the ransomware virus, it might reboot itself the next time you start your computer and complete the encryption all over again. For malware investigation, we recommend using a trustworthy machine tool such as Reimage Reimage Cleaner Intego.

The ransomware can fill various locations with malicious content that is crucial for the threat's successful operation. So in order to remove Cosakos ransomware fully, you will need to check different types of directories on your Windows machine. This includes the Windows Registry and Windows Task Manager sections.

Cosakos virusCosakos virus - ransomware that places itself on the system silently and runs malicious commands in the background

Once Cosakos ransomware is on your computer system, you will definitely notice that. First, you will spot all kinds of files renamed by adding the .cosakos appendix. Furthermore, you will receive a payment-demanding message looking like this:


Don't worry, you can return all your files!
All your files like photos, databases, documents and other important are encrypted with strongest encryption and unique key.
The only method of recovering files is to purchase decrypt tool and unique key for you.
This software will decrypt all your encrypted files.
What guarantees you have?
You can send one of your encrypted file from your PC and we decrypt it for free.
But we can decrypt only 1 file for free. File must not contain valuable information.
You can get and look video overview decrypt tool:
Price of private key and decrypt software is $980.
Discount 50% available if you contact us first 72 hours, that's price for you is $490.
Please note that you'll never restore your data without payment.
Check your e-mail “Spam” or “Junk” folder if you don't get answer more than 6 hours.

To get this software you need write on our e-mail:

Reserve e-mail address to contact us:

Our Telegram account:
Mark Data Restore

Your personal ID:

This ransom message is carried not only by Cosakos ransomware but also by other versions of Djvu ransomware. The aim of these criminals is to collect as much income as possible and by not agreeing to pay them you force their operations to fail. What is even more dangerous about ransomware is that it can inject other forms of malicious software.

For example, different variants of STOP ransomware, supposedly including also Cosakos ransomware, aim to plant AZORult Trojan horse[2] on the infected system. As you might already know, these beasts are capable of remotely controlling the entire system, collecting sensitive information, and injecting malicious objects of their own.

Cosakos ransomware

Advanced identification of emails might prevent ransomware appearance

According to research, ransomware developers choose stealth installations sources such as email spam, legitimate-looking attachments, exploit kits, peer-to-peer websites, outdated software, free Adobe Flash Player[3] updates, and similar. The best way to achieve full computer security and prevent these dangerous infections as possible is to:

  • Carefully manage all of your emails. Always identify the sender and do not open the message if it comes from an unknown source. Even if the letter does come from a well-known organization, still check for possible grammar mistakes and think if you were expecting to receive anything important lately.
  • Avoid browsing in unsecured third-party sources. There are a lot of websites that lack required protection and when fallen into the hands of bad actors, these sources are misused for malware distribution. You should especially avoid places such as video-streaming, porn-watching, gambling, and adult dating websites.
  • Take care of automatical protection. Automatical safety has the same importance level just like manual protection measures. What you have to do here is choose a reliable an expert-tested anti-malware tool that includes lots of safety features. Besides, do not forget to regularly update your program.

Advanced removal solutions for Cosakos ransomware

Cosakos virus might bring severe harm to your machine/device and this threat needs to be eliminated right after detection. If you do not get rid of it as soon as possible, you might end up with another malicious infection on your computer. Be aware of this ransomware virus and take required actions against it right after the discovery.

The Cosakos ransomware removal process is possible to complete safely and successfully only if you use reliable anti-malware software for help. Scanning the entire system for malicious objects is also a crucial thing to do. For this purpose, we recommend downloading one of these tools: Reimage Reimage Cleaner Intego, SpyHunter 5Combo Cleaner, or Malwarebytes.

Besides, after you remove Cosakos ransomware from the system, it is very important that you secure your future data. According to experts from,[4] the best way to keep your files and documents safe from malware attacks is to store them on remote serves such as Dropbox, iCloud or in a remote device such as a USB Flash drive.

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Reimage Happiness
Intego Happiness
Compatible with Microsoft Windows Supported versions Compatible with OS X Supported versions
What to do if failed?
If you failed to remove virus damage using Reimage Intego, submit a question to our support team and provide as much details as possible.
Reimage Intego has a free limited scanner. Reimage Intego offers more through scan when you purchase its full version. When free scanner detects issues, you can fix them using free manual repairs or you can decide to purchase the full version in order to fix them automatically.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Reimage, try running SpyHunter 5.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Intego, try running Combo Cleaner.

To remove Cosakos virus, follow these steps:

Remove Cosakos using Safe Mode with Networking

Activate Safe Mode with Networking and disable the operating of malicious content:

  • 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 Cosakos

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

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

Remove Cosakos using System Restore

Use System Restore to deactivate all malicious processes and activities on your computer system:

  • 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 Cosakos. 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 Reimage Cleaner Intego and make sure that Cosakos removal is performed successfully.

Bonus: Recover your data

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

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

Try using Data Recovery Pro for file restoring purposes:

Use this third-party software and you might have a chance of recovering some of your files/documents.

  • Download Data Recovery Pro;
  • Follow the steps of Data Recovery Setup and install the program on your computer;
  • Launch it and scan your computer for files encrypted by Cosakos ransomware;
  • Restore them.

Windows Previous Versions feature might allow you to recover some individual data:

You might have a chance of recovering some files if you continue using this tool exactly as shown in the guidelines.

  • 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”.

Use Shadow Explorer for file recovery:

If the ransomware virus did not delete Shadow Volume Copies of your files, you should give this method a try.

  • Download Shadow Explorer (;
  • 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.

No official Cosakos ransomware decryptor has been released yet. However, you can try using the STOP decryption tool as there is a chance that it might be helpful.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Cosakos and other ransomwares, use a reputable anti-spyware, such as Reimage Reimage Cleaner Intego, SpyHunter 5Combo Cleaner or Malwarebytes

Access your website securely from any location

When you work on the domain, site, blog, or different project that requires constant management, content creation, or coding, you may need to connect to the server and content management service more often. It is a hassle when your website is protected from suspicious connections and unauthorized IP addresses.

The best solution for creating a tighter network could be a dedicated/fixed IP address. If you make your IP address static and set to your device, you can connect to the CMS from any location and do not create any additional issues for server or network manager that need to monitor connections and activities. This is how you bypass some of the authentications factors and can remotely use your banking accounts without triggering suspicious with each login. 

VPN software providers like Private Internet Access can help you with such settings and offer the option to control the online reputation and manage projects easily from any part of the world. It is better to clock the access to your website from different IP addresses. So you can keep the project safe and secure when you have the dedicated IP address VPN and protected access to the content management system.

Backup files for the later use, in case of the malware attack

Computer users can suffer from data losses due to cyber infections or their own faulty doings. Ransomware can encrypt and hold files hostage, while unforeseen power cuts might cause a loss of important documents. If you have proper up-to-date backups, you can easily recover after such an incident and get back to work. It is also equally important to update backups on a regular basis so that the newest information remains intact – you can set this process to be performed automatically.

When you have the previous version of every important document or project you can avoid frustration and breakdowns. It comes in handy when malware strikes out of nowhere. Use Data Recovery Pro for the data restoration process.

About the author
Linas Kiguolis
Linas Kiguolis - Expert in social media

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