.FileSlack Ransomware — How to Remove It

.FileSlack Ransomware — How to Remove It

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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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