THREAT REMOVAL

RotorCrypt Ransomware Removal – Restore .Black_OFFserve Files

RotorCrypt ransomware image

Our RotorCrypt ransomware removal guide shows how computer users can restore their computers from the dangerous virus. It alters important settings on the system and can lead to further infections. Read our in-depth article to learn more about it.

Threat Summary

Name RotorCrypt
Type Ransomware, Cryptovirus
Short Description The RotorCrypt ransomware is a dangerous virus that assigns .Black_OFFserve extension to the compromised files. The victim’s system is also modified and additional malware can be instituted in them.
Symptoms The victims will notice that a large portion of their data is going to be encrypted with a powerful cipher and renamed using a template extension. They may also experience significant performance issues, application failure and other types of damage.
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 RotorCrypt.
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.

RotorCrypt Ransomware – Ways of Distribution

The RotorCrypt virus is a well-known example of the the ransomware family that shares the same name. A new virus samples has been identified that appears to be a customized version of prior code.

The current wave of RotorCrypt ransomware is primarily distributed using the traditional delivery methods. Depending on the attack campaign the criminals can opt to use email spam messages by taking advantage of different social engineering tricks. The hackers usually use templates that utilize the spread mechanics. The criminals behind the RotorCrypt virus specifically carrying the .Black_OFFserve extension strain can depend on several tactics when distributing the malware messages:

  • File Attachments — The virus files can be attached directly to the messages as attachments under different names. The victims may be coerced into opening them up by masquerading as useful software or utilities. Advanced tactics use password-protected archives which contain the ransomware strains.
  • Hyperlinks — The criminals can embed links that lead to the Rotorcrypt ransomware executable files. They are usually disguised as password reset links, login pages, confirmation dialogs or other related parts of popular web services.
  • Infected Documents — The criminals can utilize virus documents that may include rich text documents, spreadsheets or presentations of user interest. Once opened the victims will see a notification prompt. It asks them to enable the built-in macros (scripts). If this is done the infection is downloaded from a remote location and started on the local machine.

Another popular tactic for spreading malware is the creation of hacker-controlled sites. They may pose as legitimate download sites, search engines or vendors and attempt to deliver the virus file. A large part of them actually contain malware software installers. They represent modified setup files taken from the official vendors. The hacker operators behind the .Black_OFFserve virus hijack them and include the malware component. The resulting installer is then uploaded to the relevant hacker-operated site.

The hacker-controlled sites can also be found via browser hijacker instances. Users can get redirected to the via ads, scripts and banners placed on other sites or through a browser hijacker. They are malware extensions made for the most popular web browsers. Usually the list includes the following applications: Mozilla Firefox, Google Chrome, Safari, Microsoft Edge, Opera and Internet Explorer. Their standard behavior patterns are to redirect the victims to the hacker-controlled download page or directly deliver the infection automatically. They are especially dangerous as they can be further modified to cause other system changes as well.

RotorCrypt Ransomware – In-Depth Description

The RotorCrypt ransomware has been spotted in a new attack campaign. The new strain uses the .Black_OFFserve extension to differentiate itself from prior samples. Like all updated versions it is a customized variant of the original code and as such follows the same behavior patterns.

After infection the samples do not immediately begin to alter the system but delay the virus execution. This is part of the malware family’s stealth protection mechanism. It delays the virus infection on purposes in order to evade any signature and behavior scans that may be running. Another strategy that can be employed can also scan the system for any running security software (anti-virus products, sandbox and debug environments, as well as virtual machines). If found their real-time engines can be disabled or completely removed. Depending on the hacker configuration the virus may delete itself to avoid detection.

One this is done the malware engine hooks itself to system processes and hides itself in the Microsoft Windows system folder as a legitimate component. The security experts have been able to identify several prior attack campaigns that hide their tracks from the system itself as well.

If the samples associated with the .Black_OFFserve extension are direct derivatives they can suppress the error messages that are the result of its execution. The next step in the behavior pattern is the detailed information gathering process. It aims to extract two main types of data that is directly sent to the hacker operators:

  • Anonymous Metrics — This type of information refers to system information that is collected for statistical purposes by the hackers. Example data usually includes operating system version and date and time of the infections.
  • Personally-identifiable Data — The malware engine can extract information that can directly expose the users identity. This may include their names, address, preferences, interests and etc.

System changes can also impact the Windows Registry by manipulating existing values or creating new ones. This step may be part of the persistent state of execution which is achieved. It allows the malware instance to automatically block manual user removal attempts by constantly monitoring their behavior. It can also interact with the Windows volume manager which allows the ransomware component to affect files located on remoovable storage devices and available network shares as well.

Such infections can be bundled alongside Trojan code which allows the hackers to spy on the victims in real time as well as take over control of their machines at any given time.

An additional danger is the fact that the RotorCrypt ransomware samples can retrieve all data files prior to the encryption phase. This is especially useful when the hackers attempt blackmail strategies upon the victims.

The malware component also deletes all found Shadow Volume copies which makes it more difficult for the users to restore their files. In these cases a professional data recovery solution needs to be used as well.

RotorCrypt Ransomware – Encryption Process

Once all infections have complete the ransomware component is started. It is able to encrypt user files according to a built-in list of target file type extensions.

A sample list retrieved from earlier versions targets the following data:

.1cd, .avi, .bak, .bmp, .cf, .cfu, .csv, .db, .dbf, .djvu, .doc, .docx, .dt, .elf, .epf, .erf, .exe,
.flv, .geo, .gif, .grs, .jpeg, .jpg, .lgf, .lgp, .log, .mb, .mdb, .mdf, .mxl, .net, .odt, .pdf, .png,
.pps, .ppt, .pptm, .pptx, .psd, .px, .rar, .raw, .st, .sql, .tif, .txt, .vob, .vrp, .xls, .xlsb, .xlsx,
.xml, .zip

A notable addition to the file type extensions are several extensions that are used against book keeping and business software. It is very likely that the criminal operators initiate attacks against such victims.

Depending on the exact campaign that victims can receive different ransomware notes. They are frequently tweaked according to the victim users. A generic message retrieved from one of the samples 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 current active campaign assigns the following extension to the victim files: !==SOLUTION OF THE PROBLEM==blacknord@tutanota.com==.Black_OFFserve.

Previous Rotorcrypt ransomware attacks were found to feature these renaming schemes:

  • !___ELIZABETH7@PROTONMAIL.COM____.c400
  • !_____LIKBEZ77777@GMAIL.COM____.c400
  • !_____GEKSOGEN911@GMAIL.COM____.c300
  • .-.DIRECTORAT1C8@GMAIL.COM.roto
  • .-.DIRECTORAT1C@GMAIL.COM.roto
  • .-.directorat1c@gmail.com.roto
  • .-.CRYPTSb@GMAIL.COM.roto>
  • !-==kronstar21@gmail.com=–.crypt>
  • !==helpsend369@gmail.com==.crypt>
  • !__crypthelp12@gmail.com_.crypt
  • !___prosschiff@gmail.com_.crypt>
  • !____moskali1993@mail.ru___.crypt>
  • !______sufnex331@gmail.com______.crypt
  • !______bigromintol971@gmail.com______.crypt
  • !_______GASWAGEN123@GMAIL.COM____.crypt
  • !_________pkigxdaq@bk.ru_______.crypt
  • !______________DESKRYPTEDN81@GMAIL.COM.crypt

Remove RotorCrypt Ransomware and Restore .Black_OFFserve Files

If your computer got infected with the RotorCrypt ransomware virus, you should have a bit of experience in removing malware. You should get rid of this ransomware as quickly as possible before it can have the chance to spread further and infect other computers. You should remove the ransomware and follow the step-by-step instructions guide provided below.

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Martin Beltov

Martin graduated with a degree in Publishing from Sofia University. As a cyber security enthusiast he enjoys writing about the latest threats and mechanisms of intrusion.

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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.


OFFER

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 RotorCrypt from Windows.


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

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 RotorCrypt 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 RotorCrypt 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 RotorCrypt 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 RotorCrypt 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 RotorCrypt.

Ransomware infections and RotorCrypt 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 RotorCrypt from Mac OS X.


Step 1: Uninstall RotorCrypt 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 RotorCrypt:

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 RotorCrypt. 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 RotorCrypt. 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 RotorCrypt 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 RotorCrypt. 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 RotorCrypt:


Download

SpyHunter for Mac



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

Ransomware infections and RotorCrypt 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.


RotorCrypt FAQ

What is RotorCrypt ransomware and how does it work?

RotorCrypt 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 RotorCrypt ransomware infect my computer?

Via several ways.RotorCrypt 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 RotorCrypt 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 .RotorCrypt files?

You can't. At this point the .RotorCrypt 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 .RotorCrypt files successfully, then do not despair, because this virus is still new.

One way to restore files, encrypted by RotorCrypt 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 ".RotorCrypt" files (Other Methods)?

Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .RotorCrypt 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 RotorCrypt 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 RotorCrypt ransomware and then remove it without causing any additional harm to your important .RotorCrypt files.

Also, keep in mind that viruses like RotorCrypt 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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