Severity scale:  
  (70/100)

Critical Firefox Update and Kovter trojan. Know how are they related

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, similar to Urgent Firefox Update, is a fake alert which typically pop-ups on the screen when users are visiting adult-themed websites. The fake update 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 also known as Firefox virus which is aimed at 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
Type Malware/scam/adware/fake alert
Family Firefox virus
USED TO Spread Kovter.C.Trojan 
Similar scams
Symptoms Delivers fake alerts about needed software, redirected to fake update sites
Distribution Deceptive ads, software bundles
Main danger Associated with a data-collecting trojan, installs dubious software
Elimination Use Reimage Reimage Cleaner 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 cybercriminals launch click-fraud activities or install other malicious programs on the device. Furthermore, if Critical Firefox Update pop-up brings the Trojan horse[4] to your computer system, the malware will supposedly give remote access to the developers and allow the crook to carry out malware-laden activities, inject infected executables, and other malware forms. 

Critical Firefox Update message

Even though this malvertising campaign has stopped, users are advised to stay vigilant and avoid downloading fake updates. Bad actors are discovering more and more ways how to trick users via fake updates and this type of activity does not seem to stop in the nearest future. However, if you suspect that you may have installed Critical Firefox Update, you have to run a full system scan with Reimage Reimage Cleaner 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. Be aware that if you do not get rid of the cyber threat ASAP, you might have to face severe system damage, high CPU work, and other losses that we have already mentioned (money/data theft).[5]

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. Theft of personal data and various banking details might relate to monetary losses or criminals might decide to sell the collected information about you on the dark web.

Critical Firefox Update virus
Critical Firefox Update is a scam that belongs to a massive malvertising campaign used to spread Kovter trojan.

Furthermore, Critical Firefox Update has a very similar version, known as Urgent Firefox Update. This suspicious message is almost exactly the same as the previous one. It claims that Firefox needs to be updated urgently and displays a small window with the same firefox-patch file that is urged to be saved on the machine.

Additionally, Urgent Firefox Update window announces that such information is coming from faedijapanesepod101.net, eehacitysocialising.net or similar rogue websites. Note that, no reliable updates or warning messaged will be provided to you via such unrecognizable sources, so you should close the fake update window before hackers manage to trick you and inject malicious software in your computer system.

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 the “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. Additionally, make sure that you perform all recommended updates, otherwise, your programs might start crashing and become vulnerable to infections.

Terminate Critical Firefox Update virus and Kovter trojan 

Critical Firefox Update notification
Critical Firefox Update is a fake notification that can be delivered by Traffic Junky advertisements

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 Reimage Cleaner or SpyHunter 5Combo Cleaner, 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. It is important to stop malicious activities from being continued, otherwise, you will possibly encounter difficulties during the cyber threat elimination process.

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If you failed to remove virus damage using Reimage Reimage Cleaner, submit a question to our support team and provide as much details as possible.
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Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Reimage, try running SpyHunter 5.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Reimage Cleaner, try running 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 Reimage Cleaner 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 Reimage Cleaner 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 Reimage Cleaner , SpyHunter 5Combo Cleaner or Malwarebytes

About the author

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

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References

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