.FileSlack Ransomware — How to Remove It

.FileSlack Ransomware — How to Remove It

This article will aid you to remove .FileSlack Ransomware. Follow the ransomware removal instructions provided at the end of the article.

.FileSlack Ransomware is one that encrypts your data and demands money as a ransom to get it restored. Files will receive the .FileSlack extension. The .FileSlack Ransomware will leave ransomware instructions as a desktop wallpaper image. Keep on reading the article and see how you could try to potentially recover some of your locked files and data.

Threat Summary

Name.FileSlack ransomware
TypeRansomware, Cryptovirus
Short DescriptionThe ransomware encrypts files by placing the .FileSlack extension on the affected files on your computer system and demands a ransom to be paid to allegedly recover them.
SymptomsThe ransomware will encrypt your files and leave a ransom note with payment instructions.
Distribution MethodSpam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by .FileSlack ransomware


Malware Removal Tool

User ExperienceJoin Our Forum to Discuss .FileSlack ransomware.
Data Recovery ToolWindows 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.

.FileSlack Ransomware – Distribution Techniques

This particular threat was found in a low quantity attack campaign which shows that it is very possible that it is currently an early testing release. As such we do not have information about the preferred method of distribution of the final samples that are to be released. We presume that the most popular ones are going to be used at the same time in order to increase the number of affected victims.

One of the most popular ways is to deliver phishing email messages which are sent in a bulk manner and attempt to manipulate the victims into thinking that they have received a legitimate notification from a well-known company or service. The body contents will contain links to the .FileSlack ransomware file or they can be directly attached.

A similar strategy is to deploy fake malicious sites which pose as legitimate search engines, download portals and software landing pages. They will be hosted on domains that are similarly named after the real domains. Stolen or hacker-made security certificates may also be used to make the pages appear as safe.

A mechanism that is often employed to embed the virus installation scripts is to place them into payload carriers, two of the most popular types are the following:

  • Documents — The virus installation scripts can be placed as macros which are essential features that can be made part of every popular format: spreadsheets, presentations, text documents and databases. Whenever they are opened by the victim users a prompt will appear asking them to enable the scripts. The quoted reason that is most commonly displayed is that this is a requirement in order to correctly view the file.
  • Malicious Application Installers — The other strategy is to create virus-infected setup files of popular software which are distributed using the mentioned distribution methods. The criminal collective will choose applications which are commonly installed by end users: system utilities, creativity suites, productivity and office apps and etc. The hackers will take the real file and modify it accordingly. Then it can be sent via email messages, linked in fake sites or uploaded to file-sharing networks.

Larger campaigns can be planned by programming browser hijackers to deliver them as payloads. They are malicious web browser plugins which have the main goal of redirecting the victims to a preset landing page. This is done by changing their default settings: home page, search engine and new tabs page. The ransomware infection will be done as soon as the plugins are installed. They are often found on the relevant web browser plugin repository containing fake user reviews and descriptions that promise numerous performance enhancements and feature additions.

.FileSlack Ransomware – Detailed Analysis

As no information is available about the .FileSlack ransomware we assume that only the base encryption engine is part of it. These early versions of the virus can merely present a modular framework on which to work on. As such it is possible that the default behavior pattern as observed by us.

Most viruses will start the infection by retrieving sensitive information from the compromised machines. This is done via an engine that is programmed to look for certain strings according to the desired information. If it interacts with the Windows Volume Manager service then it can also access and retrieve data from network shares and removable storage devices as well. In most of the registered cases this engine will have the main goal of assigning an unique ID to each machine. This is done by using an algorithm that takes its input parameters from the list of installed hardware components, user settings and environment values.

The collected information can be used to bypass security software found on the infected machines. The engine will scan the memory and hard disk contents for any services that can block the .FileSlack Ransomware. The list includes anti-virus products, firewalls, virtual machine hosts and sandbox environments.

When the ransomware engine has obtained access to the system it can proceed with various changes. A list of the most popular ones is the following:

  • Boot Options — By changing the default boot options the .FileSlack ransomware can start automatically as soon as the computer is powered on. In addition manual recovery instructions may no longer work as access to the recovery options can be blocked. In this case only a quality anti-spyware solution will be able to remedy the infection.
  • Windows Registry Values Changes — The engine can access and modify the Windows Registry by both creating entries for itself and changing existing ones. This is particularly dangerous as any manipulation of the operating system strings can lead to severe performance issues to the point of being unable to use the computer unless the malware is completely removed. Changes to third-party applications can result in sudden applications errors and shut down.
  • Data Removal — The engine can be instructed to locate and delete sensitive files which makes recovery very difficult: System Restore Points, Backups and Shadow Volume Copies.
  • Additional Payload Delivery — The ransomware is capable of delivering other threats to the compromised machines. This is done so because the ..FileSlack Ransomware may have already bypassed key security infrastructure through its first set of commands and the second dropped virus will be able to unfold all of its potential.

Any other malicious behavior can be programmed by the criminals — most likely the scope of the commands that are to be executed will depend on the hacker configuration and the intended targets.

.FileSlack Ransomware – Encryption Process

Like other popular viruses the .FileSlack ransomware will launch the encryption engine once all prior modules have finished running. It will probably use a built-in list of target file type extensions which are to be processed by a strong cipher. An example list can include the following data types:

  • Backups
  • Databases
  • Archives
  • Images
  • Music
  • Videos

All affected files will receive the .FileSlack extension and the associated ransomware note will be called Readme_Restore_Files.txt.

Remove .FileSlack Ransomware and Try to Restore Data

If your computer system got infected with the .FileSlack 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.


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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Windows Mac OS X

How to Remove .FileSlack ransomware from Windows.

Step 1: Boot Your PC In Safe Mode to isolate and remove .FileSlack ransomware


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 .FileSlack ransomware 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 .FileSlack ransomware 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 .FileSlack ransomware 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.

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 .FileSlack ransomware 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.


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


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.


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

Step 5 (Optional): Try to Restore Files Encrypted by .FileSlack ransomware.

Ransomware infections and .FileSlack ransomware 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:

If the above link does not work for you and your region, try the other two links below, that lead to the same product:


2. On the download page, click on the "Download" button:

3. Click on "Save File" button:

4. Accept all agreements and click "Next":

5. After all the "Next" steps, click on "Install" and then wait for the installation to complete:

6. Run the software. Click on the location to scan for missing or deleted files and click on "Scan":

7. Wait for the scan to complete, it may take some time. Be advised that this scan is not 100% guaranteed to recover all files, but it does have some chance to get your data back:

Windows Mac OS X

Get rid of .FileSlack ransomware from Mac OS X.

Step 1: Uninstall .FileSlack ransomware and remove related files and objects

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 .FileSlack ransomware:

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 .FileSlack ransomware. 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 .FileSlack ransomware. 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 .FileSlack ransomware 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 .FileSlack ransomware. 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

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

Step 2: Scan for and remove .FileSlack ransomware files from your Mac

When you are facing problems on your Mac as a result of unwanted scripts and programs such as .FileSlack ransomware, the recommended way of eliminating the threat is by using an anti-malware program. Combo Cleaner offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.

Step 3 (Optional): Try to Restore Files Encrypted by .FileSlack ransomware on your Mac.

Ransomware for Mac .FileSlack ransomware aims to encode all your files using an encryption algorithm which may be very difficult to decode, unless you pay money. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files, but only in some cases. 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 recommended Data Recovery Mac app by clicking on the link underneath:

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