How to remove cosacos ransomware and recover the encrypted files

Simple cosacos ransomware removal instructions

Djvu/STOP belonging cosacos is yet another ransomware-type infection. It is discovered by Michael Gillespie. It intrudes without users’ permission and encrypts most of the files stored on computers. The encrypted files will receive .cosacos extension. For example, a file named Sample.jpg becomes Sample.jpg.cosacos after the encryption and so forth. The ransomware creates a text file named _readme.txt once the encryption process is completed. It spreads copies the text file on each folder containing encrypted files.

The text file contains a short message that states that data is compromised and that victims have to purchase a unique decryption to restore the files. Unfortunately, this is true that the decryption requires a unique key. cosacos ransomware encrypts files by using some cipher algorithm that generates a unique decryption key individually for each victim. The problem is that all the keys are stored on remote server under controlled of Cyber Criminals with an evil intention. These people blackmail the victims to pay ransom fee to provide the tool. As the note says, the victims have to contact these persons via email/telegram and pay a ransom. The cost of the decryption tool is $980. However, the users who contact within 72 hours after encryption will be provided huge 50% discount and the price will drop to $490. The evil people demand ransom fee in Bitcoin so as to hide their identities. Paying ransom fee is always not a good choice, as the Cyber Criminals ignore victims after getting the payments. It is very important to note that the cosacos ransomware is designed to encrypt data by using offline key when the machine has no Internet connection or the server is not responding. Thus, we strongly recommend you try to recover the files by using decryption tool release by Gillespie. If this does not work, the only possible solution to restore the files is to restore everything by using backup.

How did ransomware intrude?

Ransomware are distributed via using spam email campaigns, third party software download sources, trojans, and fake softare cracks/updaters. Spam email campaigns are used to send hundreds of thousands of emails containing malicious attachments and messages presenting them as important documents and encouraging users once to click/open them. Peer-to-peer networks, freeware download/free hosting sites, and freeware installers spread malware by presenting it as legit software. Next go trojans, which are viruses designed to download and install other malicious malware. Fake cracking tools and Fake updaters are designed to cause infection rather than serving the actual purpose of activating/updating software.

Threat summary

Name: cosacos ransomware

Type: Ransomware

Encrypted file extension: .cosacos

Ransom note: _readme.txt

Cyber Criminals contact: [email protected], [email protected] or @datarestore (Telegram)

Symptoms: Files cannot be opened, previously functioned files extension name changed, ransom payment is asked to do to unlock the files

Distribution methods: Infected email attachments, torrent websites, malicious ads

Damages: password stealing Trojan or some other malware could intrude along with the ransomware

Removal: Use Spyhunter to eliminate cosacos ransomware

How to prevent intrusion of ransomware?

Use official websites and direct links for any software download. Stay away from aforementioned untrustworthy software download sources. Same goes for any software activation and updating. Always rely on official providers tools for software activating/updating tools. Do not open any email attachments which look irrelevant or the sender’s address is some suspicious. For betterment, use spyhunter or other reliable antivirus tool that provides regular update for your system and prevents PC from any big issues.

Full text message shows on _readme.txt file:


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:

[email protected]

Reserve e-mail address to contact us:

[email protected]

Our Telegram account:


Mark Data Restore

Your personal ID:

Remove cosacos ransomware

Below, step by step cosacos ransomware removal instruction is provided for you. If you do not have much believe on your IT skills, you can use Spyhunter –an automatic malware removal tool to perform the removal process. This tool scans the PC for viruses and detects and deletes cosacos ransomware from the system.

Recommended Ransomware Removal & File Restoration Guide

cosacos ransomware is extremely robust in its nature to encrypt your files, and unless the threat is removed completely, file recovery is technically not possible. To do complete removal of cosacos ransomware out of your computer. Downlaod Spyhunter Anti-Spyware Tool Now.

After the infection is completely removed out of your compromised system, you may further process the encrypted file recovery either with your own lately created backup file. Or choose a trusted data recovery program to restore your data. Download a suggested recovery tool.

How to turn your encrypted files working once again?

Well, through the above explanations mentioned, you might have learned actually what happened to your files after encryption. Since the malware that has affected your files is now removed with suggested scanner, you would still require to turn your files working. And we are now going to discuss how to accomplish this task. Based on expert’s researches and their findings, there’s a number of possible methods or ways which a user can get through to restore their encrypted files to work. Even many of victimized users have tried these methods with their own infected computer and success rate is almost 95 percent. So, you can hope to have your files back, and in order to accomplish complete restore of your infected data, we suggest you check out some suggested methods here:

Methods 1: Restore encrypted files using a powerful data recovery software

Before you start to read the steps, you should know this method is appropriate to those users who have found no solutions to decrypt their files affected by ransomware. But still they are able to utilize their system and can install a software. According to experts, this method has very low difficulty level as it utilizes a program to do so.

Although this method is called to be the safest way to recover encrypted files, it still have some limitations. Technically, the encrypted data recovery solution looks through your system and its partitions to recover original files which are actually deleted by virus to replace with the encrypted one. In many cases, the user tend to copy the encrypted files on some external drive and re-install Windows OS that actually declines the chances of data recovery through this method. So, after you have managed to clean your system against malware effects, leave the files as they are and get through the steps to restore your files using one of the top most data recovery app called Stellar Phoenix Data Recovery Software.

Step 1: At first, download the app on your system by clicking the download button below.

Step 2: Click on the downloaded file through your browser to execute its installer.

Step 3: In the license agreement page, click to accept the terms and click Next button. Further, follow on-screen instructions to complete the installation, and click on Finish button finally.

Step 4: After the installation is done, the program will run automatically. At the first interface, select the file types now that you intend to recovery followed by clicking Next.

Step 5: Select the drives over which you need the software to run over and perform the recovery of encrypted files. Done? Click on Scan button.

Step 6: The software will now scan all selected drive to complete the restore process, however it may take some time depending upon volume of drives and number of files or directories were there previously. After the scanning process ends, you will be shown with a file explorer with preview of your data which you want to recover. Just select those which you need to be restored.

Step 7: Browse a location where you want the restored data to be saved.

Method 2: Encrypted file recovery with a lately created Windows backup

This method is technically for those who have a lately created Windows backup saved somewhere and is not affected by the ransomware. Using inbuilt system recovery services, the backup can restore the files which are included under the backup. This method is considered easier as well and leaves no software, thus considered as a very popular method to fight against emergencies caused by infectious malware. Here are the steps to follow:

Step 1: Hit Win + R key combination and to execute Run command line.

Step 2: In the Run text field, type ‘ms-settings:windowsupdate’ and hit the OK button.

Step 3: You will be shown Windows update settings, but you have actually to click Backup option as shown in picture, and located in left pane.

Step 4: Click on ‘More Options’ to open Backup Options panel.

Step 5: As shown in the image below, select or click on “Restore files from a current backup.”

Step 6: In the next shown window, locate the backup where you have saved it, and click on restore button below as marked in the image.

Methods 3: Using Shadow Explorer Application

This file recovery solution is recommended to those who have their backup but is currently not working, still the files under backup are not yet deleted. In this case, Shadow Explorer is an application that can help you restoring your files from those backup files which are active, but still disabled by ransomware somehow. Under this circumstance, inbuilt Windows Backup and Recovery option will not work for you, rather the software will do the magic easily. To accomplish file recovery in this case, get through the steps here mentioned:

Step 1: Click the button below to download Shadow Explorer on your computer.

Step 2: Browser the location where you have downloaded the file. Double click and extract the zip file.

Step 3: Click to open ShadowExplorerPortable directory and double click on the file as shown in the image below.

Step 4: A drop down menu will appear on screen, so just select a desired Date and time according to your requirements on the top left of Shadow Explorer app, and choose the files in given interface that you want to restore using the software. Once the selection is done, Click on the button Export..

Methods 4: Using other decryptors

Well, this method might sounds a bit weird as every ransomware identity basically uses different enciphers and methods to encrypt files on targeted computers. But when the a ransomware which has actually infected your machine comes from a ransomware family for which a decryptor is officially working and available as well, then this might work for you. Technically, this method is just based on luck and analysis, still many users have reported this worked for them. So, if you have seen a ransomware has infected your computer, the very first thing you should do is to identity what kind of virus has actually affected your machine. In most of the cases, ransomware attacks are irreversible, still those infections basically comes from a parent ransomware which might be cracked earlier. For an instance, Scarab ransomware or Hiddentear ransomware are some families which can be decrypted. To check your luck if the present ransomware that has affected your machine is decryptable or not. To do so, follow the guidelines below:

Step 1: Check the Ransomware Database Here and check if decryptor is available for the malware

Step 2: In case you find no results, you can check an open source project called NoMoreRansom to find the ransomware details and decryptor, which has affected your machine. If found, download the decryptor on your computer’s local drive. This page is being regularly updated by its officials once a ransomware is discovered in world.

Step 3: Before you proceed with the downlaoded decryptor, make sure you have backup all your important files.

Step 4: Execute the decryptor to scan and restore your files easily.

Recommended Ransomware Removal & File Restoration Guide

cosacos ransomware is extremely robust in its nature to encrypt your files, and unless the threat is removed completely, file recovery is technically not possible. To do complete removal of cosacos ransomware out of your computer. Downlaod Spyhunter Anti-Spyware Tool Now.

After the infection is completely removed out of your compromised system, you may further process the encrypted file recovery either with your own lately created backup file. Or choose a trusted data recovery program to restore your data. Download a suggested recovery tool.