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Critical Firefox Update virus. How to remove? (Uninstall guide)

removal by Gabriel E. Hall - - | Type: Malware

Critical Firefox Update is a malicious scam used to distribute Kovter trojan

Critical Firefox Update
Critical Firefox Update virus is a fake alert that initiates the install of malicious applications.

Critical Firefox Update is a scam which is typically pop-ups on the screen when users are visiting adult-themed websites. The fake update alert is delivered by the compromised Traffic Junky ads that distribute the hazardous Kovter.C Trojan. This virus is one of the main components of the huge malvertising campaign created by KovCoreG group. Criminals compromised a Traffic Junky ad-network which places ads on the Pornhub website. According to the Proofpoint research,[1] the campaign may have been actively working for years. The whole malvertising campaign is targeting Firefox, Chrome, Explorer, and Microsoft Edge web browsers. While Mozilla Firefox users have been interrupted by the Critical Firefox Update virus, Chrome users have been dealing with Critical Chrome Update and Adobe Flash Player’s update.[2]

Name Critical Firefox Update virus
Type Malware
Spreading Kovter.C.Trojan 
Symptoms Delivers fake alerts, messages about software installs
Distribution Deceptive ads, software bundles
Main danger Associated with a data-collecting trojan, installs dubious software
Elimination Use Reimage to find out if there is any virus damage on the device and remove Critical Firefox Update virus with anti-malware of your choice

The fake alert reporting about the needed update for Firefox has been bothering millions of computer users in the United Kingdom,[3] the United States, Canada, and Australia. Victims of the Critical Firefox Update were redirected to a fake update website as soon they visited the adult-themed website. Later on, the fake Firefox update website includes an active download button that drops firefox-patch.js file which has nothing in common with updating the browser. This javascript file belongs to the Kovter trojan and executes it on the system.

This Critical Firefox Update virus might also inject malicious code into various Windows OS processes, alter Registry and execute PowerShell commands. The malicious program might also let cyber criminal to launch click-fraud activities or install other malicious programs on the device.

Even though this malvertising campaign has stopped, users are advised to stay vigilant and avoid downloading fake updates. However, if you suspect that you may have installed this malicious Firefox update, you have to run a full system scan with Reimage or another security software to see if there is any malware on the system.

Some trojan related files can be detected by your antivirus, so you should remove Critical Firefox Update with anti-malware of your choice. This method of virus elimination also improves the performance of your device since it scans the system thoroughly.

Automatic Critical Firefox Update removal is necessary because you need to wipe out all malicious components from the system, including the Kovter.C trojan which might be responsible for stealing sensitive information or installing other malware on the device.

Deceptive ads initiate dangerous software downloads

Various malware spreads in the form of a pop-up that pretends to be a legit browser’s update. The trojan can be installed on the system as soon as a person clicks “Download” button and lets the malicious Javascript file is downloaded. Therefore, users are advised to be careful with update alerts. Before agreeing to install any content from the web, you have to make sure that it’s actually safe.

Even though this malvertising campaign is already stopped, similar cyber threats can be installed on your system this way. While browsing the internet, you might notice various software promoting ads or update alerts which might also be capable of spreading malicious programs. Keep in mind that legit software updates do not pop up in the browser’s new tab. Usually, they arrive in the form of a program window.

However, you have always to check available updates on the publisher’s website to avoid fatal mistakes. Remember to get your software from reputable sources so you can avoid getting additional programs or tools that might affect the performance or security of your device.

Terminate Critical Firefox Update virus and Kovter trojan 

If you have downloaded a malicious file offered by the scam, you have to run a full system scan with a reputable anti-malware software to remove Critical Firefox Update virus and Kovter malware from the device. We highly recommend scanning the system with your preferred security tool. You can use Reimage or Malwarebytes MalwarebytesCombo Cleaner, Plumbytes Anti-MalwareMalwarebytes Malwarebytes for the system repair and additional double-checking because there is a chance that the trojan horse caused secret system changes on your computer.

It’s important to complete the virus elimination task immediately because the trojan might steal sensitive and banking-related information. If you are not trusting your IT skills try automatic Critical Firefox Update removal. However, you can also follow the instructions below. They will show you how to disable the virus first.

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What to do if failed?
If you failed to remove virus damage using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to remove virus damage. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with Malwarebytes.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with Combo Cleaner.

To remove Critical Firefox Update virus, follow these steps:

Remove Critical Firefox Update using Safe Mode with Networking

Follow these steps to disable Critical Firefox Update malware and run automatic removal:

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove Critical Firefox Update

    Log in to your infected account and start the browser. Download Reimage or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete Critical Firefox Update removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove Critical Firefox Update using System Restore

This method might also help to run security software and remove Critical Firefox Update virus as well as Kovter trojan:

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of Critical Firefox Update. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage and make sure that Critical Firefox Update removal is performed successfully.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Critical Firefox Update and other ransomwares, use a reputable anti-spyware, such as Reimage, Malwarebytes MalwarebytesCombo Cleaner or Plumbytes Anti-MalwareMalwarebytes Malwarebytes

About the author

Gabriel E. Hall
Gabriel E. Hall - Passionate web researcher

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References