Uninstall Critical Firefox Update virus (Free Removal Instructions) - May 2020 updated

Description of Critical Firefox Update scam

Critical Firefox Update is a dangerous pop-up alert that can be used for promoting Kovter trojan virus

Critical Firefox Update is a fake window that is used for spreading trojan

Critical Firefox Update is a notification used by scammers as a social engineering strategy similar to Urgent Firefox Update. Typically, people encounter it in the form of a pop-up when visiting pornographic or gambling websites. According to the researchers, this dubious update scam is managed by the Traffic Junky ads, which is an online marketing platform very infamous for spreading the malicious Kovter.C Trojan.

Upon a close investigation initiated by the Proofpoint researchers, it has been found that the Critical Firefox Update virus is a puzzle piece of the malspam campaign initiated by a group dubbed as KovCoreG. In reality, Traffic Junky is a legitimate advertising company, which is affiliated with the Pornhub website. The problem has carried when hackers injected malicious scripts into the ad-networks traffic. Since then, Pornhub visitors keep encountering a so-called Firefox virus. Despite its close reference to the Mozilla Firefox web browser, in reality it can attack Chrome, Explorer, and Microsoft Edge in the same manner.

Nevertheless, it turns out the majority of victims of the Critical Firefox Update virus have been using the related web browser as default, while, at the same time, Google Chrome users experienced virus attacks via the Critical Chrome Update and Adobe Flash Player’s update.

People across the United Kingdom, the U.S., Canada, and Australia have been actively reporting a rogue popup urging to update the Firefox web browser even it is up-to-date. According to them, the Critical Firefox Update virus is linked to a very popular pornographic website, which redirects to a rogue Firefox update websites when visited.

Visiting the fake Firefox update domain itself is not that dangerous if you do not click on any content. According to cybersecurity researchers, potential victims can fall real victims by clicking on a provided download button, which is infected with malicious drive-by-download scripting. Once clicked, the button downloads a firefox-patch.js javascript file, which works as a Kovter trojan downloader. Critical Firefox Update scan can also be used for other Windows systems improvisations, including the Registry, PowerShell, File library, and so on.

Unfortunately, the system that encounters the Critical Firefox Update pop-up and suffers a background Kovter attack gets extremely vulnerable to other cyber attacks. Moreover, keeping a duet of malware and trojan on the system is highly dangerous due to the regular harvesting of PII, password thefts, and other activities that can allow hackers to connect to the victim's device remotely.

By clicking on the download button positioned on the Critical Firefox Update window people download a javascript file, which subsequently downloads a trojan

The campaign has been active since 2017. Currently, it seems to be suspended. However, security experts warn people to stay cautious, especially when we're talking about updates. Do not rely on pop-up notifications showing randomly when you browse the web. Criminals are actively using malicious scripting and insert them into poorly protected ad-servers, thus even though you might not encounter the Critical Firefox Update virus as such, it may reappear under a different name, but working under the same strategy.

If, however, you believe that your PC got hit by Critical Firefox Update malware, we recommend launching a scan with [d2[ or another anti-malware program. Besides, it is advisable to scan the system with FortectIntego repair tool to recover the damage that the tandem of malware and trojan might have caused.

If you are using a reputable antivirus program, there are no doubts that it will be able to remove Critical Firefox Update virus and malicious trojanized files. We strongly encourage people to initiate regular AV scans not only to keep it virus-free, but also to maintain its performance and stability. The only way to delete all malicious malware components is to use an automatic utility. Manual Critical Firefox Update removal is hard because it's not clear under what names the Kovter.C trojan and its supportive files are hiding.

The Critical Firefox Update virus is promoted with the help of malware that triggers redirects to rogue update download website

Always bear in mind that each threat has to be decontaminated without a delay. Otherwise, you may put yourself, your money, and your identity at the risk of being explored by hackers. As for the theft of credentials, criminals may not only steal the money from your bank account but also get paid for such information on various underground forums.

Update: recently we have been informed about a newly released variant of the Critical Firefox Update scam. Dubbed as Urgent Firefox Update, the latter mimics Firefox's design and contains the utmost information, i.e. Firefox lacks for crucial updates and needs to be updated asap. According to the researchers, this pop-up scam contains the same firefox-patch.js javascript file, which is promoted as the “crucial update.”

Moreover, the Urgent Firefox Update pop-up window is a final stop of the redirects initiated by the faedijapanesepod101.net, eehacitysocialising.net, and other fake websites. Do not forget that all legitimate updates for OS and software should be downloaded from official websites only. Redirects to unknown domains are the first sign that something is going wrong.

People risk downloading malware by clicking on suspicious ads

The fake browser and software updates are one of the most common malware distribution methods. It's rather easy for hackers to inject malicious scripts into the Download button, which once clicked is treated as the user's consent to download malicious Javascript files.

Having this in mind, it's important to avoid software updates that pop up on the screen when visiting ransom websites. If you have doubts that some updates are missing on your PC, open the official website of the software, and download the required update directly.

As we have already pointed out, this particular campaign has been suspended. However, cybercriminals were quick to invent new variants of this type. Therefore, in the broadest sense, you should never trust questionable online content, such as pop-ups, ads, alerts, updates, forced new tabs, redirects, etc.

Critical Firefox Update is infected by javascript file that downloads a trojan and then starts harvesting victim's credentials

Learn how to eliminate Critical Firefox Update and Kovter trojan simultaneusly

Those who have been tricked into clicking on the download button positioned on the fake update alert, scan the system with a professional antivirus to remove Critical Firefox Update virus and Kovter trojan from your PC. For that, use the most powerful AV engine that you manage to come up with. If you mind out recommendations, then try using SpyHunter 5Combo Cleaner or Malwarebytes programs.

After that, you should double-check the system with FortectIntego repair tool to make sure that all malware and trojan-related files have been recovered or removed. The elimination of suchlike programs is urgent due to the risk of identity theft, banking information theft, and the total system's crash.

You can learn how to remove Critical Firefox Update virus from your computer by following the steps provided down below this article. However, if you don't feel IT-savyy enough to deal with a trojan by yourself, you can always ask for help. Anyway, we recommend following the guide submitted by our security experts because it's written in a comprehensive manner and we believe that you will manage to terminate the virus on your own.