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Remove Rotor Virus (cocoslim98) and Restore .tar Files

stf-rotor-ransomware-cocoslim98-gmail-com-virus-ransom-message-small

Cocoslim98 is a newly emerged cryptovirus, which is called like that, because of the email that it leaves for contacting the criminals behind it. Malware researchers say that its real name is “Rotor”. The virus will encrypt files on a compromised machine and add the .tar extension to them and after that it will ask for 7 Bitcoins to be paid to the cocoslim98@gmail.com address. To see how to remove this virus and how you can try to restore your encrypted files, read the full article carefully.

Threat Summary

Name Rotor Virus
Type Ransomware, Cryptovirus
Short Description The virus will encrypt files and demand a ransom as payment for decrypting them.
Symptoms The ransomware puts the .tar extension appended to each file that is locked and asks for 7 Bitcoins and to contact the address cocoslim98@gmail.com
Distribution Method Spam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by malware

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User Experience Join Our Forum to Discuss Rotor Virus.
Data Recovery Tool Windows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

Rotor Virus (cocoslim98) – Update February 2018

Update! A decryption tool is now available for the Rotor Ransomware Virus (RotorCrypt)! The tool was created by malware researchers from Kaspersky and can be downloaded from the following link, wrapped inside a .zip archive: Rakhni Decryption Tool.

Rotor Virus (cocoslim98) – Infection

The Rotor virus a.k.a. Cocoslim98 ransomware can infect your computer machine using different ways. The payload file could be distributed with spam email campaigns. Through the emails the file can be attached and introduced as important. The whole email will look legitimate and will try to convince you that you need to download the attachment, because the full data could not be conveyed in the body of the email. If you open the file, however, deem your computer infected. That file can be obfuscated, but it is an executable in most cases.

stf-rotor-ransomware-cocoslim98-gmail-com-virus-total-analysis-trojan-ransom-win32-rotor

You can see from the analysis report, shown above, of the VirusTotal site that the file is called GbMxybQN.exe and already being detected by many Antivirus vendors. The creators of the ransomware could be spreading that file with targeted attacks or via sharing services and social media platforms. Refrain from opening executables from suspicious emails and links, especially if they are with an unknown origin. Scan such files with a security program and check their signatures and size first. You should have a look at the ransomware prevention tips in our forum.

Rotor Virus (cocoslim98) – Analysis

Malware researchers have discovered that what many infected users call the Cocoslim98 ransomware is actually a previously known cryptovirus named “Rotor”. You can see that in the platform Payload Security, the detection for the malicious executable file is Trojan-Ransom.Win32.Rotor:

stf-rotor-ransomware-cocoslim98-gmail-com-virus-payload-security-report-trojan-ransom-win32-rotor

When the payload file of the Rotor virus is on a computer, it can wait up to two whole minutes before executing, according to malware researchers of Payload Security. The virus seems to primarily target servers, although basic Windows machines have been infected as well.

After execution Rotor could set up values in the Windows Registry for perseverance. These values are set in entries of the registry and make the ransomware start automatically with each boot of the Windows operating system. After files are encrypted a small note with instructions for paying the ransom is created. You can view that ransom note in the snapshot below:

stf-rotor-ransomware-cocoslim98-gmail-com-virus-ransom-message

The ransom message reads the following:

Good day

Your files were encrypted/locked
As evidence can decrypt file 1 to 3 1-30MB
The price of the transcripts of all the files on the server: 7 Bitcoin

Recommend to solve the problem quickly and not to delay

Also give advice on how to protect Your server against threats from the network

(Files sql mdf backup decryption strictly after payment)!

The Rotor ransomware does not give you a particular deadline for paying the cybercriminals to decrypt your data. It also offers free decryption of a few files for testing purposes. However, its demands are rather high with the amount of money that is asked and that the decryption of some files being only available after payment. The ransom price is 7 Bitcoins which amounts to a little more than 4400 US dollars.

You shouldn’t be thinking of paying the extortionists, as no one can give you a guarantee that you will get your files back after payment. The crooks will most probably use the money to make another ransomware or do other criminal acts. Besides, you should decrypt as many files as possible using their test decryption service and wait for a possible solution.

A full and official list of extensions being encrypted by the ransomware is not yet available, but the following file types have been reported to be encrypted by the Rotor virus:

→.csv, .doc, .ppt, .xls, .avi, .bak, .bmp, .dbf, .djvu, .docx, .exe, .flv, .gif, .jpeg, .jpg, .mdb, .sql, .mdf, .odt, .pdf, .png, .pps, .pptm, .pptx, .psd, .rar, .raw, .tif, .txt, .vob, .xlsb, .xlsx, .zip

All of the encrypted files will have the extension !____cocoslim98@gmail.com____.tar appended to them. That is where the contact email is stated and why the ransomware is known by that name among infected users. Although, there are also a few reports of files having the extension !____GLOK9200@gmail.com____.tar. The used encryption algorithm is unknown, but the .tar archive files do not seem regular. On top of that, usually, the MAC operating system has such files.

The Rotor ransomware is highly likely to delete the Shadow Volume Copies of the Windows operating system with the following command:

→vssadmin.exe delete shadows /all /Quiet

Continue to read and see in what ways you can try to restore some of your files. Kaspersky may have a possible solution in the form of a decryptor tool.

Remove Rotor Virus (cocoslim98) and Restore .tar Files

If your computer got infected with the Rotor ransomware virus, you should have some experience in removing malware. You should get rid of this ransomware as fast as possible before it can have the chance to spread further and infect more computers. You should remove the ransomware and follow the step-by-step instructions guide given below. To see ways that you can try to recover your data, see the step titled 2. Restore files encrypted by Rotor Virus.

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Berta Bilbao

Berta is a dedicated malware researcher, dreaming for a more secure cyber space. Her fascination with IT security began a few years ago when a malware locked her out of her own computer.

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Attention! SensorsTechForum strongly recommends that all malware victims should look for assistance only by reputable sources. Many guides out there claim to offer free recovery and decryption for files encrypted by ransomware viruses. Be advised that some of them may only be after your money.

As a site that has been dedicated to providing free removal instructions for ransomware and malware since 2014, SensorsTechForum’s recommendation is to only pay attention to trustworthy sources.

How to recognize trustworthy sources:

  • Always check "About Us" web page.
  • Profile of the content creator.
  • Make sure that real people are behind the site and not fake names and profiles.
  • Verify Facebook, LinkedIn and Twitter personal profiles.


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REMOVE IT NOW (PC)
with Anti-Malware
We recommend you to download SpyHunter and run free scan to remove all virus files on your PC. This saves you hours of time and effort compared to doing the removal yourself.
SpyHunter 5 free remover allows you, subject to a 48-hour waiting period, one remediation and removal for results found. Read EULA and Privacy Policy


Windows Mac OS X

How to Remove Rotor Virus from Windows.


Step 1: Boot Your PC In Safe Mode to isolate and remove Rotor Virus

OFFER

Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your PC with SpyHunter

Keep in mind, that SpyHunter’s scanner is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware removal tool to remove the malware threats. Read our SpyHunter 5 review. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria

1. Hold Windows key() + R


2. The "Run" Window will appear. In it, type "msconfig" and click OK.


3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".
Tip: Make sure to reverse those changes by unticking Safe Boot after that, because your system will always boot in Safe Boot from now on.


4. When prompted, click on "Restart" to go into Safe Mode.


5. You can recognise Safe Mode by the words written on the corners of your screen.


Step 2: Uninstall Rotor Virus and related software from Windows

Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it. To do that:


1. Hold the Windows Logo Button and "R" on your keyboard. A Pop-up window will appear.


2. In the field type in "appwiz.cpl" and press ENTER.


3. This will open a window with all the programs installed on the PC. Select the program that you want to remove, and press "Uninstall"
Follow the instructions above and you will successfully uninstall most programs.


Step 3: Clean any registries, created by Rotor Virus on your computer.

The usually targeted registries of Windows machines are the following:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

You can access them by opening the Windows registry editor and deleting any values, created by Rotor Virus there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.


2. When you open it, you can freely navigate to the Run and RunOnce keys, whose locations are shown above.


3. You can remove the value of the virus by right-clicking on it and removing it.
Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.

IMPORTANT!
Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode.
This will enable you to install and use SpyHunter 5 successfully.

Step 4: Scan for Rotor Virus with SpyHunter Anti-Malware Tool

1. Click on the "Download" button to proceed to SpyHunter's download page.


It is recommended to run a scan before purchasing the full version of the software to make sure that the current version of the malware can be detected by SpyHunter. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria.


2. After you have installed SpyHunter, wait for it to update automatically.

SpyHunter5-update-2018


3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.

SpyHunter5-Free-Scan-2018


4. After SpyHunter has finished scanning your PC for any files of the associated threat and found them, you can try to get them removed automatically and permanently by clicking on the 'Next' button.

SpyHunter-5-Free-Scan-Next-2018

If any threats have been removed, it is highly recommended to restart your PC.

Step 5 (Optional): Try to Restore Files Encrypted by Rotor Virus.

Ransomware infections and Rotor Virus aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the reccomended Data Recovery software by clicking on the link underneath:

Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.


Windows Mac OS X

Get rid of Rotor Virus from Mac OS X.


Step 1: Uninstall Rotor Virus and remove related files and objects

OFFER
Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your Mac with SpyHunter for Mac
Keep in mind, that SpyHunter for Mac needs to purchased to remove the malware threats. Click on the corresponding links to check SpyHunter’s EULA and Privacy Policy


1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:


2. Find Activity Monitor and double-click it:


3. In the Activity Monitor look for any suspicious processes, belonging or related to Rotor Virus:

Tip: To quit a process completely, choose the “Force Quit” option.


4. Click on the "Go" button again, but this time select Applications. Another way is with the ⇧+⌘+A buttons.


5. In the Applications menu, look for any suspicious app or an app with a name, similar or identical to Rotor Virus. If you find it, right-click on the app and select “Move to Trash”.


6: Select Accounts, after which click on the Login Items preference. Your Mac will then show you a list of items that start automatically when you log in. Look for any suspicious apps identical or similar to Rotor Virus. Check the app you want to stop from running automatically and then select on the Minus (“-“) icon to hide it.


7: Remove any left-over files that might be related to this threat manually by following the sub-steps below:

  • Go to Finder.
  • In the search bar type the name of the app that you want to remove.
  • Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
  • If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.

In case you cannot remove Rotor Virus via Step 1 above:

In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:

Disclaimer! If you are about to tamper with Library files on Mac, be sure to know the name of the virus file, because if you delete the wrong file, it may cause irreversible damage to your MacOS. Continue on your own responsibility!

1: Click on "Go" and Then "Go to Folder" as shown underneath:

2: Type in "/Library/LauchAgents/" and click Ok:

3: Delete all of the virus files that have similar or the same name as Rotor Virus. If you believe there is no such file, do not delete anything.

You can repeat the same procedure with the following other Library directories:

→ ~/Library/LaunchAgents
/Library/LaunchDaemons

Tip: ~ is there on purpose, because it leads to more LaunchAgents.


Click the button below below to download SpyHunter for Mac and scan for Rotor Virus:


Download

SpyHunter for Mac



Step 3 (Optional): Try to Restore Files Encrypted by Rotor Virus.

Ransomware infections and Rotor Virus aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the reccomended Data Recovery software by clicking on the link underneath:

Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.


Rotor Virus FAQ

What is Rotor Virus ransomware and how does it work?

Rotor Virus is a ransomware infection - the malicious software that enters your computer silently and blocks either access to the computer itself or encrypt your files.

Many ransomware viruses use sophisticated encryption algorithm how to make your files inaccessible. The goal of ransomware infections is to demand that you pay a ransom payment to get access to your files back.

How does Rotor Virus ransomware infect my computer?

Via several ways.Rotor Virus Ransomware infects computers by being sent via phishing e-mails, containing virus attachment.

This attachment is usually masked as an important document, like an invoice, bank document or even a plane ticket and it looks very convincing to users.

After you download and execute this attachment, a drive-by download occurs and your computer is infected with the ransomware virus.

Another way, you may become a victim of Rotor Virus is if you download a fake installer, crack or patch from a low reputation website or if you click on a virus link. Many users report getting a ransomware infection by downloading torrents.

How to open .Rotor Virus files?

You can't. At this point the .Rotor Virus files are encrypted. You can only open them once they are decrypted.

Decryptor did not decrypt my data. What now?

Do not panic and backup the files. If a decryptor did not decrypt your .Rotor Virus files successfully, then do not despair, because this virus is still new.

One way to restore files, encrypted by Rotor Virus ransomware is to use a decryptor for it. But since it's a new virus, advised that the decryption keys for it may not be out yet and available to the public. We will update this article and keep you posted as soon as this decryptor is released.

How Do I restore ".Rotor Virus" files (Other Methods)?

Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .Rotor Virus files.

These methods are in no way 100% guarantee that you will be able to get your files back. But if you have a backup, your chances of success are much greater.

How do I get rid of Rotor Virus ransomware virus?

The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti malware software. It will scan for and locate Rotor Virus ransomware and then remove it without causing any additional harm to your important .Rotor Virus files.

Also, keep in mind that viruses like Rotor Virus ransomware also install Trojans and keyloggers that can steal your passwords and accounts. Scanning your computer with an anti-malware software will make sure that all of these virus components are removed and your computer is protected in the future.

What to Do If nothing works?

There is still a lot you can do. If none of the above methods seem to work for you, then try these methods:

  • Try to find a safe computer from where you can can login on your own line accounts like One Drive, iDrive, Google Drive and so on.
  • Try to contact your friends, relatives and other people so that they can check if they have some of your important photos or documents just in case you sent them.
  • Also, check if some of the files that were encrypted it can be re-downloaded from the web.
  • Another clever way to get back some of your files is to find another old computer, a flash drive or even a CD or a DVD where you may have saved your older documents. You might be surprised what will turn up.
  • You can also go to your email account to check if you can send any attachments to other people. Usually what is sent the email is saved on your account and you can re-download it. But most importantly, make sure that this is done from a safe computer and make sure to remove the virus first.

More tips you can find on our forums, where you can also asks any questions about your ransomware problem.

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