If your antivirus program detects a suspicious file that could harm your data, computer, and network, it might warn you about Trojan:JS/Obfuse!MSR. This virus often looks like a privacy tool for your web browser but is actually a malicious program that can do harm.

As soon as Trojan:JS/Obfuse!MSR is detected on the Windows computer, users must immediately run a thorough virus scan to eliminate the threat.

Illustration of Trojan:JS/Obfuse!MSR

How does it infect the computer?

Trojan:JS/Obfuse!MSR usually sneaks in when you download free software from untrustworthy sources. It can also come from fake software updates, spam emails, or sketchy websites.

When you run it, Trojan:JS/Obfuse!MSR sets up a bad browser extension. It pretends to be helpful for keeping your browsing private but is really up to no good. Sometimes, it claims to make your online searches safer or improve your browsing, but don’t fall for it.

Trojan:JS/Obfuse!MSR is a big problem because it can show unwanted stuff in your browser and push you to dodgy sites, possibly infecting you with more viruses or malware.

How does this malware operate?

Trojan:JS/Obfuse!MSR operates by disguising itself as a legitimate file or program, making it difficult for users to detect its presence. Once it infiltrates a computer, it typically hides within system files or disguises its processes to evade detection by antivirus software. This stealthy behavior allows Trojan:JS/Obfuse!MSR to remain undetected while carrying out its malicious activities, such as stealing sensitive information or providing unauthorized access to the attacker.

Moreover, Trojan:JS/Obfuse!MSR often employs techniques like encryption or obfuscation to cloak their activities further, making it challenging for security measures to identify and remove them. Additionally, they may establish covert communication channels with remote servers, enabling attackers to control the infected computer remotely without the user’s knowledge. This covert operation allows Trojan:JS/Obfuse!MSR to persistently compromise the security and integrity of the infected system, posing significant risks to both individual users and organizations.


You might see warnings from antivirus programs when they spot a dodgy file, indicating a threat to your data, computer, and network. These Trojans often pretend to be helpful browser add-ons or privacy tools but are actually bad, using Java Script files to cause trouble on your computer. You might notice strange changes in your browser, like an extra extension that pretends to help with privacy or security enhancements. Trojan:JS/Obfuse!MSR often shows annoying ads, especially ones that take you to sketchy sites, disrupting your browsing and risking more infections. If you keep getting sent to unfamiliar sites, especially after downloading from iffy sources or running shady software, you might have Trojan:JS/Obfuse!MSR. For more assistance

For more help

There are lots of versions of this threat, like Trojan:JS/Obfuse!MSR, but they’re all related. For information on similar threats and how to remove them, check out the Trojan Script category.

Versions of Trojan:JS/Obfuse!MSR
Version Name Alert Level Date Added
Trojan:PHP/!MSR Severe Feb. 10, 2024

How to remove Trojan:JS/Obfuse!MSR?

To totally remove Trojan:JS/Obfuse!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/Obfuse!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/Obfuse!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/Obfuse!MSR virus, 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 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/Obfuse!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 a virus scanner

To remove Trojan:JS/Obfuse!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/Obfuse!MSR or similar attacks, you can activate Sophos to have real-time scanning and complete defense against all forms of threats.

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 the first window 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. An internet connection is required when running this scanner in order to download important updates. Make sure that everything is up-to-date to effectively remove viruses like Trojan:JS/Obfuse!MSR.

6. Click the Start Scanning button to  carry out the Scan. This will check the system for the presence of malicious objects, malware, and viruses. The tool reveals items that were found linked to Trojan:JS/Obfuse!MSR and other suspicious entities. Be sure to remove all identified threats.

Screenshot of Sophos Virus Scan

After executing the above instructions, Trojan:JS/Obfuse!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/Obfuse!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/Obfuse!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/Obfuse!MSR. The process may take a while to complete.

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

How to protect the computer from Trojan:JS/Obfuse!MSR?

The initial defense that comes to mind for any computer user is to install an anti-virus or anti-malware program. This move is sensible and probably the most practical way to protect the computer against a Trojan:JS/Obfuse!MSR attack. Hence, keep in mind that having security software does not guarantee full protection. The majority of the prevention still lies in being cautious of users, and therefore, we are providing the following information as guidelines to protect the computer from virus infection.

Avoid Malicious Websites

There are enormous numbers of websites that were made for the primary purpose of spreading Trojan:JS/Obfuse!MSR. Normally, these sites are involved in integrating malicious pop-up and browser hijacker, that will eventually cause further virus infections. Avoid such websites.

Ignore and Delete Phishing Emails

The mass-mailing of computer viruses gives the attackers the luxury of spreading their malicious code in just one send-off. This will arrive in the inbox as an email that appears to be from a legitimate organization. So, if you receive an unexpected email with a link or an attached file, better delete it immediately.

Do Not Click a Suspicious Link

Links from social media, forums, and blog sites are sometimes being utilized by attackers to drive web users to a malicious page that contains malicious code. Therefore, do not just click on any link, especially if it looks suspicious. Accidental access to the destination site may lead to a Trojan:JS/Obfuse!MSR infection.

Be Careful When Downloading Files

Cracked software, serial key generators, and several freeware are seen as another method that spreads the Trojan:JS/Obfuse!MSR virus. Avoid acquiring these types of applications, and if there is a need to download freeware or shareware, be sure to obtain it from the official website or trusted providers.

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