Cosakos Virus File

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This page aims to help you remove Cosakos Virus Ransomware for free. Our instructions also cover how any .cosakos file can be recovered.

The computer threat represented by Ransomware cryptoviruses isn’t anything new – this type of malware has been around for much longer than most users may thing, dating back to the end of the last century. However, it wasn’t up until the past several four or five years that these malicious computer infections became such a huge and global threat on the Internet. Currently, Ransomware is one of the worst possible forms of malware that you can get inside your computer, and the main reason for this is because if you get your files encrypted by such a virus, you may never get them back no matter what you do. Still, giving up trying to minimize the damage done by a Ransomware is definitely not something that we would advise you to do. In fact, we are writing this article to help our readers with Cosakos – this is a new cryptovirus that was recently set loose on the Internet and it is currently looking for its latest victims. If you have Cosakos in you computer, after reading this post, you should be able to make an informed decision about what to do next in order to deal with this infection in the best way possible.

How does the .Cosakos virus operate?

Cosakos Virus File

You will find this message left by the .Cosakos Virus in a _readme.txt file.

Once it infiltrates the computer, Cosakos much like other ransomware such as Mogranos or Nelasod silently initiates a data-encryption process, which covertly encrypts all of the personal user files in the computer. Though certain symptoms like increased RAM and CPU use, as well as decreased free storage space, may be observed, it is rather difficult to notice them, especially on a more powerful computer.

 After the completion of the encryption process, the Ransomware goes on to display a ransom-demanding message on the screen of the invaded machine. The message is usually in the form of a big banner or a notepad file placed on the Desktop, and the text in it informs the victim that the only way to receive the decryption key for their files is if they send money (usually in BitCoin) to the hackers behind Cosakos. Sending the ransom money, however, isn’t a particularly good idea – there is always the risk of not getting the key for your files even after the payment has been made in accordance with the hackers’ demands. This is why our suggestion for you is to try to eliminate the infection and then try some of the alternative restoration suggestions that you will find here.

Recovering from the .Cosakos file encryption

Cosakos Virus File

How an encrypted .Cosakos File looks like.

In order to be perfectly honest with you, we must tell you that such a recovery may not always be an option at the given moment. If you remove the virus, you will likely still need to deal with its encryption as it would still be on the files. Some of the possible alternatives we have here may work, but there is no guarantee of that. This is why it is important to check your other devices, online accounts, and clouds for the presence of any forgotten backups – you can use these to restore some of your data in case all else fails, but make sure to first remove the virus with the help of the removal guide below before you attempt to restore any of the files, or they may get encrypted all over again.


Name Cosakos
Type Ransomware
Danger Level High (Ransomware is by far the worst threat you can encounter)
Symptoms A Ransomware would normally stay hidden and invisible to the user until it shows the ransom-demanding message.
Distribution Method Sites with pirated content, as well as adult sites are oftentimes used for spreading misleading ads that may land you a Ransomware.
Data Recovery Tool [banner_table_recovery]
Detection Tool

Cosakos Ransomware Removal

Cosakos Virus File

Some of the steps will likely require you to exit the page. Bookmark it for later reference.

Reboot in Safe Mode (use this guide if you don’t know how to do it).

Cosakos Virus File


Press CTRL + SHIFT + ESC at the same time and go to the Processes Tab. Try to determine which processes are dangerous. 

Cosakos Virus File

Right click on each of them and select Open File Location. Then scan the files with our free online virus scanner:

Cosakos Virus File
Drag and Drop Files Here to Scan
Maximum file size: 128MB.

This scanner is free and will always remain free for our website's users. You can find its full-page version at:

Scan Results

Virus Scanner Result
Cosakos Virus FileClamAV
Cosakos Virus FileAVG AV
Cosakos Virus FileMaldet

After you open their folder, end the processes that are infected, then delete their folders. 

After you open their folder, end the processes that are infected, then delete their folders. 

Note: If you are sure something is part of the infection – delete it, even if the scanner doesn’t flag it. No anti-virus program can detect all infections.

Cosakos Virus File

Hold the Start Key and R –  copy + paste the following and click OK:

notepad %windir%/system32/Drivers/etc/hosts

A new file will open. If you are hacked, there will be a bunch of other IPs connected to you at the bottom. Look at the image below:

Cosakos Virus File

If there are suspicious IPs below “Localhost” – write to us in the comments.

Type msconfig in the search field and hit enter. A window will pop-up:

Cosakos Virus File

Go in Startup —> Uncheck entries that have “Unknown” as Manufacturer.

  • Please note that ransomware may even include a fake Manufacturer name to its process. Make sure you check out every process here is legitimate.

Cosakos Virus File

Type Regedit in the windows search field and press EnterOnce inside, press CTRL and F together and type the virus’s Name. 

Search for the ransomware  in your registries and delete the entries. Be extremely careful –  you can damage your system if you delete entries not related to the ransomware.

Type each of the following in the Windows Search Field:

  1. %AppData%
  2. %LocalAppData%
  3. %ProgramData%
  4. %WinDir%
  5. %Temp%

Delete everything in Temp. The rest just check out for anything recently added. Remember to leave us a comment if you run into any trouble!

Cosakos Virus File 

How to Decrypt Cosakos files

We have a comprehensive (and daily updated) guide on how to decrypt your files. Check it out here.

If the guide doesn’t help, download the anti-virus program we recommended or try our free online virus scanner. Also, you can always ask us in the comments for help!


About the author


Brandon Skies

Brandon is a researcher and content creator in the fields of cyber-security and virtual privacy. Years of experience enable him to provide readers with important information and adequate solutions for the latest software and malware problems.

1 Comment

  • Please anybody help me . The ransomware has encrypted all files in my computer (except folders and shortcuts) to .cosakos . I already reinstalled my Windows 10 for this problem . But the files are the same . I am begging you guys please tell me a way to decrypt these files .

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