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Remove Trojan.U83 (Virus Removal Instructions) - Chrome, Firefox, IE, Edge

removal by Jake Doevan - - | Type: Adware

Trojan.U83 is a non-existent virus name that crooks use to promote their cleverly engineered online scam

Trojan.U83 fake alert

Trojan.U83 is a fake alert that users might encounter when they get redirected to a malicious website. The bogus pop-up claims that Mac users' machines were infected with a trojan[1] on the last web page they visited. Allegedly, the only way to fix the issue is by downloading and installing useless scareware software under the name Mac Heal Pro.

The social engineering attack in most cases starts with adware[2] – these potentially unwanted programs enter users' machines without notice during freeware installation and change settings of Google Chrome, Safari, Mozilla Firefox or other browser and starts displaying pop-ups, deals, offers, banners, in-text links, and other intrusive content. Thus, while browsing the internet, users might randomly encounter Trojan U83 message, which usually catches users off guard.

While experienced users will notice that Applecare Trojan.U83 is a scam immediately, those less computer-savvy individuals might panic and follow the instructions provided by cybercriminals behind the threat. Unfortunately, these actions might result in money loss, personal information disclosure to unknown parties, as well as installation of malicious tools on the macOS.

Name Trojan.U83
Category Adware
Type Scam
Infiltration Software bundling, third-party sites, ads
Symptoms Intrusive ads on all browsers, scam messages claiming virus infection, redirects to phishing sites, etc.
Main dangers Money loss, malware infections, sensitive data leak
Termination Use automatic tools to delete adware or make use of our manual guide below
Recovery and optimization After you terminate the PUP, scan your Mac with Reimage Reimage Cleaner Intego to recover from the infection swiftly

Trojan.U83 virus is not one-of-a-kind, as crooks used multiple other fictional threat names in online scam schemes before, including Tapsnakee.tre456_worm_osx, Adware_pop.exe, and many others. These fake viruses are scams and do not exist in the cybersecurity world.

Trojan.U83 Mac warning states the following:


The last website has infected your computer with a Trojan.U83.

Immediate repair is required. Click Ok to continue.

**If you leave this page your computer is exposed to being permanently damaged.**

If you encounter this or a similar pop-up on your browser, take into consideration that only your anti-malware software is capable of determining whether or not your macOS is infected with viruses. Therefore, you do not need to remove Trojan.U83 but rather an adware that is hiding inside your computer.

Regardless of which fake virus the crooks claim your machine is infected with, the background of the message often claims that “Your System is infected with 3 viruses.” If you proceed with the bogus scan, the site will prompt you to download a fake tool for the alleged Trojan.U83 removal.

Besides the Trojan.U83 scam messages, you might also notice the following adware infection symptoms:

  • Changed homepage, search engine and new tab address;
  • Increased amount of advertisement on sites that you visit;
  • Redirects to dangerous websites;
  • Slowdown of the browser or/and the operating system;
  • Sponsored links at the top of search results;
  • Suspicious shortcuts, bookmarks and other elements added to your device.

Besides, adware often tracks its users and might make use of browser vulnerabilities to inject malware automatically. For that reason, if you have been seeing Trojan.U83 Mac warning, make sure you scan your device with a reputable security application. After that, make use of Reimage Reimage Cleaner Intego for the best results and a swift recovery.

Trojan.U83 scamTrojan.U83 is a scam that is used by cybercrooks in order to make users believe that their Mac machines are infected with malware and that the only way to remove it is to download bogus software

Ways you could avoid adware and other PUP infections

One of the main reasons why users get convinced by online scams is because they are unaware of how adware operates or why they see these fake messages in the first place. Therefore, to avoid getting scammed by a bogus pop-up or redirect, make sure you research it online, look for grammar or spelling mistakes, aggressive tone of the message (for example, “download XXX of face consequence”), and similar scam signs.[3]

On the other hand, if you will manage to avoid adware, you will be less likely to encounter online scams in the first place. Therefore, you should always pay close attention to the installation process of the new software and decline any deals or offers, remove all the marks from the pre-ticked boxes and always select Advanced/Custom settings instead of Recommended/Quick ones.

Stop Trojan.U83 fake alerts by deleting adware hiding inside your Mac

Virus warning withing browsers are all fake, as only security software that is capable of analyzing malware patterns on your computer can alert you about real threats. Therefore, take that into consideration and never install any software promoted on sites that claim Trojan.U83 virus or another malware intrusion.

To remove Trojan.U83 Mac warnings, you will have to terminate adware that is inside your machine. You can either make use of anti-malware software or delete the threat manually with the help of our detailed step-by-step guide below.

Note that, if you encountered the message just once or twice, it does not mean that adware is present, as you might have been redirected from another site that practices shady advertisement techniques. Therefore, if you are not sure, always scan your device with an anti-virus application.

Once you complete Trojan.U83 removal, you should also reset all the installed browsers in order to delete all the traces of adware.

You may remove virus damage with a help of Reimage Reimage Cleaner Intego. SpyHunter 5Combo Cleaner and Malwarebytes are recommended to detect potentially unwanted programs and viruses with all their files and registry entries that are related to them.

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Reimage Happiness
Intego Happiness
Compatible with Microsoft Windows Supported versions Compatible with OS X Supported versions
What to do if failed?
If you failed to remove virus damage using Reimage Intego, submit a question to our support team and provide as much details as possible.
Reimage Intego has a free limited scanner. Reimage Intego offers more through scan when you purchase its full version. When free scanner detects issues, you can fix them using free manual repairs or you can decide to purchase the full version in order to fix them automatically.
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 Intego, try running Combo Cleaner.

To remove Trojan.U83, follow these steps:

Uninstall Trojan.U83 from Mac OS X system

To stop Trojan.U83 fake messages, perform the following steps on macOS or Mac OS X:

If your macOS is displaying some infection symptoms, proceed with the following guide:

Remove Trojan.U83 from Applications folder:

  1. From the menu bar, select Go > Applications.
  2. In the Applications folder, look for Trojan.U83-related entries.
  3. Click on the app and drag it to Trash (or right-click and pick Move to Trash)Uninstall from Mac 1

To fully remove Trojan.U83, you need to access Application Support, LaunchAgents, and LaunchDaemons folders and delete relevant files:

  1. Select Go > Go to Folder.
  2. Enter /Library/Application Support and click Go or press Enter.
  3. In the Application Support folder, look for any dubious entries related to Trojan.U83 and then delete them.
  4. Now enter /Library/LaunchAgents and /Library/LaunchDaemons folders the same way and terminate all the Trojan.U83-related entries.Uninstall from Mac 2

Remove Trojan.U83 from Internet Explorer (IE)

Remove dangerous add-ons:

  1. Open Internet Explorer, click on the Gear icon (IE menu) on the top-right corner of the browser
  2. Pick Manage Add-ons.
  3. You will see a Manage Add-ons window. Here, look for Trojan.U83 and other suspicious plugins. Click on these entries and select Disable.Remove add-ons from Internet Explorer

Change your homepage if it was altered:

  1. Open IE and click on the Gear icon.
  2. Select Internet Options.
  3. In the General tab, delete the Home page address and replace it by your preferred one (for example,
  4. Click Apply and then select OK.Reset IE homepage

Delete temporary files:

  1. Press on the Gear icon and select Internet Options.
  2. Under Browsing history, click Delete…
  3. Select relevant fields and press Delete.Clear temporary files from Internet Explorer

Reset Internet Explorer:

  1. Click on Gear icon > Internet options and select Advanced tab.
  2. Select Reset.
  3. In the new window, check Delete personal settings and select Reset again to complete Trojan.U83 removal.Reset Internet Explorer

Eliminate Trojan.U83 from Microsoft Edge

Delete unwanted extensions from MS Edge:

  1. Select Menu (three horizontal dots at the top-right of the browser window) and pick Extensions.
  2. From the list, pick the Trojan.U83-related extension and click on the Gear icon.
  3. Click on Uninstall at the bottom.Remove extensions from Edge

Clear cookies and other browser data:

  1. Click on the Menu (three horizontal dots at the top-right of the browser window) and select Privacy & security.
  2. Under Clear browsing data, pick Choose what to clear.
  3. Select everything (apart from passwords, although you might want to include Media licenses as well, if applicable) and click on Clear.Clear Edge browsing data

Reset MS Edge if that above steps did not work:

  1. Press on Ctrl + Shift + Esc to open Task Manager.
  2. Click on More details arrow at the bottom of the window.
  3. Select Details tab.
  4. Now scroll down and locate every entry with Microsoft Edge name in it. Right-click on each of them and select End Task to stop MS Edge from running.Reset MS Edge

If this solution failed to help you, you need to use an advanced Edge reset method. Note that you need to backup your data before proceeding.

  1. Find the following folder on your computer: C:\\Users\\%username%\\AppData\\Local\\Packages\\Microsoft.MicrosoftEdge_8wekyb3d8bbwe.
  2. Press Ctrl + A on your keyboard to select all folders.
  3. Right-click on them and pick DeleteAdvanced MS Edge reset 1
  4. Now right-click on the Start button and pick Windows PowerShell (Admin).
  5. When the new window opens, copy and paste the following command, and then press Enter:

    Get-AppXPackage -AllUsers -Name Microsoft.MicrosoftEdge | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\\AppXManifest.xml” -VerboseAdvanced MS Edge reset 2

Instructions for Chromium-based Edge

Delete extensions from MS Edge (Chromium):

  1. Open Edge and click select Settings > Extensions.
  2. Delete unwanted extensions by clicking Remove.Remove extensions from Chromium Edge

Clear cache and site data:

  1. Click on Menu and go to Settings.
  2. Select Privacy and services.
  3. Under Clear browsing data, pick Choose what to clear.
  4. Under Time range, pick All time.
  5. Select Clear now.Clear browser data from Chroum Edge

Reset Chromium-based MS Edge:

  1. Click on Menu and select Settings.
  2. On the left side, pick Reset settings.
  3. Select Restore settings to their default values.
  4. Confirm with Reset.Reset Chromium Edge

Delete Trojan.U83 from Mozilla Firefox (FF)

Remove dangerous extensions:

  1. Open Mozilla Firefox browser and click on the Menu (three horizontal lines at the top-right of the window).
  2. Select Add-ons.
  3. In here, select plugins that are related to Trojan.U83 and click Remove.Remove extensions from Firefox

Clear cookies and site data:

  1. Click Menu and pick Options.
  2. Go to Privacy & Security section.
  3. Scroll down to locate Cookies and Site Data.
  4. Click on Clear Data…
  5. Select Cookies and Site Data, as well as Cached Web Content and press Clear.Clear cookies and site data from Firefox

In case Trojan.U83 did not get removed after following the instructions above, reset Mozilla Firefox:

  1. Open Mozilla Firefox browser and click the Menu.
  2. Go to Help and then choose Troubleshooting Information.Reset Firefox 1
  3. Under Give Firefox a tune up section, click on Refresh Firefox…
  4. Once the pop-up shows up, confirm the action by pressing on Refresh Firefox – this should complete Trojan.U83 removal.Reset Firefox 2

Get rid of Trojan.U83 from Google Chrome

Remember to reset Google Chrome after you delete the PUP:

Delete malicious extensions from Google Chrome:

  1. Open Google Chrome, click on the Menu (three vertical dots at the top-right corner) and select More tools > Extensions.
  2. In the newly opened window, you will see all the installed extensions. Uninstall all the suspicious plugins that might be related to Trojan.U83 by clicking Remove.Remove extensions from Chrome

Clear cache and web data from Chrome:

  1. Click on Menu and pick Settings.
  2. Under Privacy and security, select Clear browsing data.
  3. Select Browsing history, Cookies and other site data, as well as Cached images and files.
  4. Click Clear data.Clear cache and web data from Chrome

If the above-methods did not help you, reset Google Chrome to eliminate all the Trojan.U83-components:

  1. Click on Menu and select Settings.
  2. In the Settings, scroll down and click Advanced.
  3. Scroll down and locate Reset and clean up section.
  4. Now click Restore settings to their original defaults.
  5. Confirm with Reset settings to complete Trojan.U83 removal.Reset Chrome 2

Erase Trojan.U83 from Safari

Remove unwanted extensions from Safari:

  1. Click Safari > Preferences…
  2. In the new window, pick Extensions.
  3. Select the unwanted extension related to Trojan.U83 and select Uninstall.Remove extensions from Safari

Clear cookies and other website data from Safari:

  1. Click Safari > Clear History…
  2. From the drop-down menu under Clear, pick all history.
  3. Confirm with Clear History.Clear cookies and website data from Safari

Reset Safari if the above-mentioned steps did not help you:

  1. Click Safari > Preferences…
  2. Go to Advanced tab.
  3. Tick the Show Develop menu in menu bar.
  4. From the menu bar, click Develop, and then select Empty Caches.Reset Safari

Do not let government spy on you

The government has many issues in regards to tracking users' data and spying on citizens, so you should take this into consideration and learn more about shady information gathering practices. Avoid any unwanted government tracking or spying by going totally anonymous on the internet. 

You can choose a different location when you go online and access any material you want without particular content restrictions. You can easily enjoy internet connection without any risks of being hacked by using Private Internet Access VPN.

Control the information that can be accessed by government any other unwanted party and surf online without being spied on. Even if you are not involved in illegal activities or trust your selection of services, platforms, be suspicious for your own security and take precautionary measures by using the VPN service.

Backup files for the later use, in case of the malware attack

Computer users can suffer from data losses due to cyber infections or their own faulty doings. Ransomware can encrypt and hold files hostage, while unforeseen power cuts might cause a loss of important documents. If you have proper up-to-date backups, you can easily recover after such an incident and get back to work. It is also equally important to update backups on a regular basis so that the newest information remains intact – you can set this process to be performed automatically.

When you have the previous version of every important document or project you can avoid frustration and breakdowns. It comes in handy when malware strikes out of nowhere. Use Data Recovery Pro for the data restoration process.

About the author
Jake Doevan
Jake Doevan - Computer technology expert

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