Trojan:JS/MalScript!MSR

Trojan:JS/MalScript!MSR is a threat identified by Microsoft Security Software. This is typical malware made with JavaScript that targets the core system of Windows in order to complete its tasks. Trojan:JS/MalScript!MSR was made to execute a series of commands once it got inside the system. It will gather data like system settings, Windows version, network configuration, and so on. The collected data will be sent to a remote attacker for analysis.

Illustration for Trojan:JS/MalScript!MSR

How does it infect the computer?

In general, the system will get infected with Trojan:JS/MalScript!MSR if the malicious JavaScript code is executed on the computer. The source of this Trojan may vary due to the changing ways in which it is deployed. Typically, spam email messages disguised as open letters from reputable institutions are used to deceive recipients. The body of the message contains enticing phrases that try to convince the user to open the attached file.

Malicious links from social media sites and instant messaging programs are also seen as methods used in distributing Trojan:JS/MalScript!MSR. Illegally distributed software and media materials may also contain code that can lead to the infection of this malware.

How does this malware operate?

In order to run itself on Windows start-up, Trojan:JS/MalScript!MSR will make a copy of itself under system files. Then, a registry entry is created to call the file on each Windows boot. Apart from that, this malware will also drop non-malicious files in various folders of the compromised computer.

Trojan:JS/MalScript!MSR occasionally connects to a remote host to execute tasks like the following:

  • Notify the attacker of the new infection.
  • Sends gathered data from the infected computer.
  • Download and execute additional files, including an updated version of the Trojan.
  • Accept a command from a remote attacker.
  • Install and change the default internet browser application, especially Google Chrome.

Symptoms

Observing rapid changes in internet browser behavior can help identify the type of Trojan:JS/MalScript!MSR infection. This Trojan repeatedly tries to take control of or change browser settings in order to redirect users to malicious websites or collect personal data, such as login passwords. Some instances of these modifications include the unwanted set-up of the homepage and default search engines without the user’s permission.

Additionally, Trojan:JS/MalScript!MSR may inject malicious JavaScript into trustworthy websites, resulting in unexpected pop-ups or redirects. These modifications may interfere with normal browsing and could lead to a potential security breach. To avoid further harm and protect important data, computer users should investigate the possibility of a Trojan:JS/MalScript!MSR infection if they notice unusual activity on the PC.

For more help

A threat family that includes Trojan:JS/MalScript!MSR has had multiple versions released into the wild. Please browse the Trojan Scripts category to see similar threats and matching removal methods.

How to remove Trojan:JS/MalScript!MSR?

To totally remove Trojan:JS/MalScript!MSR from the computer and get rid of relevant viruses and trojans, please execute the procedures as stated on this page. Make sure that you have completely scanned the system with the suggested malware removal tools and virus scanners.

Quick Fix - Scan the PC with Combo Cleaner for Windows

Combo Cleaner is a trusted PC security and optimization tool equipped with a powerful virus and malware detection engine. This program can get rid of hazardous viruses like Trojan:JS/MalScript!MSR 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 Trojan:JS/MalScript!MSR, 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 the Trojan:JS/MalScript!MSR virus, including all malicious objects from the computer.

To fully optimize the features of antivirus and privacy scanners, users may have to upgrade to the premium version.

Please continue with the succeeding removal procedures if you are comfortable manually getting rid of the virus and malicious items linked to 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 Trojan:JS/MalScript!MSR. 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 : Run Sophos Home Virus Scanner

To remove Trojan:JS/MalScript!MSR, we suggest that you scan the infected computer with this powerful virus removal tool. It can detect and get rid of Trojans, viruses, malware, and adware from the infected computer. To fully protect the computer against Trojan:JS/MalScript!MSR or similar attacks, you can activate Sophos to have real-time scanning and complete defense against all forms of threats.

1. Please click on the link below to download the program.

2. After downloading, locate the file SophosInstall.exe in the Downloads folder.

3. Install by double-clicking on the file.

4. If it prompts "Do you want to allow this app to make changes on your device?" please click Yes.

5. Next, it will display the Terms and Conditions page. Click the Install button to begin.

Screenshot of Sophos Home Terms and Conditions

6. Run the installation with the default settings. Please note that an internet connection is required in order to download important updates.

7. After finishing the installation, you must login to the dashboard. If you already have a Sophos account, please login. Otherwise, please enter your details and click on the Create Account button.

8. Once you are in the Sophos Home dashboard, click the Scan button to start checking the computer for Trojan:JS/MalScript!MSR components.

Screenshot of Sophos Home Dashboard

9. Scanning may take a while; please wait for this process to finish.

10. After scanning the computer, Sophos Home will start cleaning or deleting files infected with Trojan:JS/MalScript!MSR.

11. You may now close Sophos Home. The computer is now free from Trojan:JS/MalScript!MSR, as well as associated malware and viruses.

After executing the above instructions, Trojan:JS/MalScript!MSR should have been completely removed from the computer. If there are still signs of infection or the computer is displaying unusual behaviors, please continue with the remaining procedures.

Another alternative for Windows 10/11 users is to scan the computer with Microsoft Defender Offline. This will run a virus scan in the recovery environment.

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 Trojan:JS/MalScript!MSR. 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 Trojan:JS/MalScript!MSR, 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 Trojan:JS/MalScript!MSR. The process may take a while to complete.

5. After the scan, Delete/Quarantine identified threats, whether they were relevant to Trojan:JS/MalScript!MSR 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.

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