Remove Qscx Ransomware (Decrypt .qscx Files)

Qscx is a deadly virus that belongs to ransomware family of Stop/DJVU. This threat is notorious in locking majority of computer user’s files by encrypting them with complex algorithmic pattern. In addition, the virus appends .qscx files extension to encrypted data. Once it has completed locking the entire target pool of data, Qscx ransomware is going to ask victims for payment in exchange for the decryption tool and unique key.

How Qscx virus infects the computer?

Majority of victims are not aware how their computer was infected with Qscx ransomware. Normally, this type of virus is attached to spam email messages, malicious software bundles, or fake software updates that are obtained from suspicious sources. In addition, web injectors and malicious pop-up advertisements are counted as extra conduit for the successful deployment of Qscx ransomware.

Of all the above-mentioned techniques, there is a surge of infection cases through spam email campaign. Probably, it was because attackers can send copies of the virus to thousands of recipients daily. The messages where Qscx ransomware is attached are disguising as valid correspondent or digital letter from a prominent organization especially business entities. The email covers topic as product inquiry, payment procedure, taxation, shipping details, and other things that are relevant to work and business dealing. Because of the short notice on the message body, recipients are enticed to look at the complete details, which are inside the attached files. So, as soon as email user opens the file, Qscx ransomware initiates the attack and starts to drop files on the computer including the ransomware itself.

Screenshot of Qscx files

Qscx File encryption and decryption

Qscx ransomware looks for target files and encrypts them with sophisticated technique while employing a unique key obtained from a remote server. Two keys were generated for this attack, one at the hacker’s sever, and the other one is on the infected computer. These two must match using a decryption software, so, breaking the code would be impossible. Attackers are offering to decrypt all .qscx files for a steep price of $490 – $980. This will serve as payment for the Qscx decryption tool and private key that are both needed to recover all encrypted files. These statements are all covered on the ransom note file _readme.txt as shown below.

Technical Details
Threat Name Qscx Ransomware, Stop, DJVU
Threat Type Crypto-virus, File Locker, Encryption Virus
File Extension .qscx
Ransom Amount $490 – $980
Ransomware Note File _readme.txt
Discovered by @dnwls0719
Virus Alias AegisLab : Trojan.Win32.Generic.lCNY
AhnLab-V3 : Trojan/Win.Generic.R425626
Alibaba : Trojan:Win32/Kryptik.1e45db0c
ALYac : Trojan.Ransom.Stop
Avast : Win32:PWSX-gen
BitDefender : Trojan.GenericKD.46480149
ClamAV : Win.Malware.Filerepmalware-9871262-0
DrWeb : Trojan.Siggen13.56076
Emsisoft : Trojan.Crypt (A)
eScan : Trojan.GenericKD.46480149
ESET-NOD32 : A Variant Of Win32/Kryptik.HLIK
Fortinet : W32/Kryptik.TR!tr
Ikarus : Trojan.Win32.Glupteba
Kaspersky : HEUR:Trojan-Ransom.Win32.Stop.gen
McAfee : GenericRXOW-EN!8B3072889EA3
Microsoft : Trojan:Win32/Azorult.RM!MTB
Sophos : ML/PE-A + Troj/Kryptik-TR
Symantec : ML.Attribute.HighConfidence
VBA32 : BScope.Trojan.Sabsik.FL
Webroot : W32.Trojan.Gen

Backup your files

One important step before proceeding with the procedures below is to backup your files. Ransomware are not the same. Each has its unique sets of payloads aside from encrypting the files with complex method. Others tend to delete the infected files after certain period, while others keep them concealed on hidden places. In addition, ransomware decryption tools are not guaranteed to be perfect, there are instances that files suffer from damages during the decryption process.

So, create a backup copy of your entire Qscx encrypted files right now.

Qscx Ransomware Removal Guide

First thing to do is remove the Qscx virus before attempting the decryption. Remember that as long as the ransomware is active, it will repeatedly encrypt the files on the compromised computer.

Infection of Qscx ransom virus is dangerous to the system because it can inject files that runs each time Windows starts. To prevent the malicious files from loading, Windows operating system must run with minimal process and it can be done through SafeMode With Networking.

Quick Fix - Scan the PC with Combo Cleaner for Windows

Combo Cleaner is a trusted PC security and optimization tool equipped with powerful virus and malware detection engine. This program can get rid of ransomware like Qscx through this procedure.

1. Download the application from the following page:

2. Save the file to your preferred location.

3. Double-click the downloaded file CCSetup.exe and install with the default settings.

CC for Windows Installation

4. At the end of the setup process, click Finish to run Combo Cleaner.

5. The tool will update the signature file, please wait for this process to complete.

6. To begin checking for threats like Qscx ransomware, click on the Start Scan button. Wait for this scan to finish.

CC for Windows Start Scan

7. At the end of the scan process, click on Remove all threats to delete Qscx ransomware including all malicious objects from the computer.

Free features of Combo Cleaner for Windows include Disk Cleaner, Big Files finder, Duplicate files finder, and Uninstaller. To use antivirus, privacy scanner, and to delete identified threats, users have to upgrade to a premium version.

Please continue with the succeeding removal procedures if your are comfortable to manually get rid of the threat and malicious items linked with it.

Step 1 : Start Windows in Safe Mode With Networking

The method of running Windows in Safe Mode before running a virus scan is effective in getting rid of Qscx. This process can prevent most viruses and malware from loading, making it easier to detect and remove them.

1. On the Windows Search bar, please type msconfig.

Screenshot of MSConfig Command

2. Select and open System Configutation on the list of found results.

3. Once you are in the System Configuration window, go to the Boot tab.

Screenshot of SafeBoot

4. Under the Boot Options area, please check Safe Boot and select Network. This will allow Windows to boot in Safe Mode with Networking.

5. Lastly, click on Apply and OK to save the changes.

6. Please restart Windows.

Do not forget to restore the normal boot process of Windows after running the virus scan. Simply repeat the method above, and this time, uncheck the Safe Boot option to run Windows normally.

Step 2 : Scan the Computer with Sophos Antivirus

Ransomware files are placed deeply into the system and on various locations, thus, thorough scanning is vital to totally remove Qscx virus. Aside from our suggested tool, you may also run your own security program.

To remove Qscx ransomware automatically, scanning the computer with this efficient anti-malware tool is suggested. This scanner does not just uncover known threats like viruses or malware, it is also effective in discovering hazardous ransomware like Qscx.

1. Download Sophos Virus Removal Tool from the link below. Save the file on your computer where you can easily access it.

2. Once the download completes, browse the location of the file. Double-click to run the program and begin the install process.

3. On first windows of installation wizard, click Next to continue. Then, it will display the program’s License Agreement. You need to Accept the terms in order to proceed. If Windows prompts for User Account Control, please click Yes to proceed.

Screenshot of Sophos EULA Page

4. On succeeding windows, click Next or Continue to carry on with the installation. After completing the installation process, Launch Sophos Virus Removal Tool.

5. Internet connection is required when running this virus scanner in order to download important updates. Make sure that everything is up-to-date to effectively remove Qscx ransomware and other relevant viruses.

6. Click the Start Scanning button to inspect the computer. This will check the system for presence of malicious objects, malware, and viruses. The tool reveals items that were found linked to Qscx ransomware and other suspicious entities. Be sure to remove all identified threats.

Screenshot of Sophos Virus Scan

The above procedures should have totally eliminated Qscx ransomware. However, if you found that there are still remnants of the virus, please proceed to succeeding procedures below.

Step 3 : Double Check with Windows Security Apps

Microsoft Windows has a built-in security application that you can use to double-check if your computer is still infected with Qscx. For Windows 10/11 users, please run Windows Security.

Windows 10 / 11 Instructions:

Windows Security is a free tool that was built to help you remove Qscx, viruses, and other malicious items from Windows 10/11 systems. Follow these procedures to scan your computer with the tool:

1. Tap or click the Search charm, search for Windows Security, and then open the application.

Image of Windows Security Search

2. On the Home tab, click Virus and threat protection from the sidebar.

3. On the main window, click on Scan Options. Then, click on Full Scan button.

Image of Scan Options

4. Lastly, click on the Scan now button to start scanning for the presence of Qscx. The process may take a while to complete.

5. After the scan, Delete/Quarantine identified threats, whether they were relevant to Qscx or not. You may now restart Windows to complete the virus removal process.

For older versions of Windows, you can scan the computer for free with the Microsoft Malicious Software Removal Tool (MSRT 64-Bit). It is a stand-alone virus scanner tool that targets prevalent malware groups.

Recover Files from Qscx Ransomware Infection

On this section, we will provide ways to decrypt files infected with Qscx ransomware. Aside from dedicated decryption software and common tools, other options for file recovery are provided. As much as we can, we will update this area whenever there is new and more suitable decryption tool was made available.

Decrypting Qscx infected files with Emsisoft Tools

This service from Emsisoft is helpful in unlocking encrypted files without paying the ransom. The page provides the list of ransomware decryption tools. All you have to do is look for the specific tool and start recovering the Qscx encrypted file.

Option: Use ShadowExplorer to restore files encrypted by Qscx Ransomware

ShadowExplorer depends on the presence of System Protection on every drive from which you wish to retrieve data. Furthermore, it is crucial that System Protection is enabled prior to any event that requires file recovery. It is worth noting that Windows automatically enables System Protection solely on the system partition (C). 

ShadowExplorer is taking advantage of shadow copy created by Windows system. This tool allows you to retrieve older version of files before it was encrypted by Qscx ransomware.

1. Download ShadowExplorer from the official web site.

2. Install the program with the default settings.

3. The program should run automatically after installation. If not, double-click on ShadowExplorer icon.

4. You can see the drop-down list on top of the console. Please select proper drive and the most recent point-in-time shadow copies of files you wish to restore prior to Qscx ransomware infection.

Screenshot of ShadowExplorer

5. Right-click on the Drive, Folder, or File you wish to restore and click Export...

6. Lastly, ShadowExplorer will prompt for location where you want to save the copy of recovered files.

How to protect the computer from Qscx ransomware?

After the removal of the ransomware, it is important to prevent similar incident from happening again. In order to protect the computer effectively, computer user must know how Qscx ransomware was able to infect the computer. To minimize the possible infection, staying away from the common sources of this virus is crucial.

How Qscx ransomware can infect your computer?

The method of infecting the computers was found to be similar as other common viruses. Though, ransomware like Qscx is seen to have efficient deployment via spam email messages, web injectors, malicious software installers, misleading online advertisements, and through another virus infection.

Once the virus is executed, it immediately infects the system. Then, Qscx ransomware communicates to remote server so that unique key can be generated for the specific computer. After acquiring the key, it starts to decrypt target files using a complex method that is almost unbreakable. On the last stage of the attack, Qscx ransomware demands for ransom money as payment for the decryption tool. To further understand the attack scheme, we have included an infographic below.

Infographic image of ransomware attack stages
You can print, download, or share the infographic by clicking the image.

Securing the computer against ransomware attack

Do a Regular File Back-up - Always backup your data on a separate storage devices such as external hard drives, optical discs, or online backup services.

Keep Your Software Updated - Make sure that you have the latest software updates especially on the operating system. Recent updates often contain vital security patches to help protect the computer against all forms of threats.

Install a Security Program - Protect the computer with effective anti-virus application using efficient real-time scanning. Regularly run a complete scan to check the computer for presence of malware.

Protect your files with Controlled Folder Access (Windows 10/11)

For Windows 10/11 users, aside from protecting the computer using anti-virus or anti-malware programs, one way to protect against ransomware attack is by using Controlled Folder Access. This feature of Windows Defender Security Center may not prevent the Qscx ransomware infection, but it can protect the folder and files in general. Follow the steps to enable Controlled Folder Access in Windows 10/11.

1. Go to Windows Taskbar and search for Windows Defender Security Center.

2. Open Windows Defender Security Center and click on Virus & Threat Protection icon.

Virus and Threat Protection

3. On next window, please click on Ransomware Protection.

4. Under Controlled Folder Access section, switch the slider to On. That will enable the feature and protect the folder against Qscx virus or any type of ransomware.

Controlled Folder Access

5. Click on Protected Folders link to include additional folders. Make sure that folders where important files are located should be included in the list.

Include Your Protected Folder

Troubleshooting Guide

Certain programs maybe blocked by Controlled Folder Access feature. To fix the issue, simply have the specific program to be white listed.

1. Under Protected Folders, click Allow an app through controlled folder access.

2. Next, click the Add an allowed app and include the target executable file.

This Controlled Folder Access feature is one way to protect files against Qscx ransomware. Other important things to do in keeping files safe against ransomware is through early prevention like keeping programs updated, install an efficient security program, an do regular file backup on a separate media drive.

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