A dangerous program that targets computers and seeks to take control of both the system and the internet browser application is detected as PUA:Win32/Webcompanion. Microsoft Defender Antivirus detects and removes browser extensions and stand-alone programs that are typically installed on computers without prompting users.

It usually happens that PUA:Win32/Webcompanion shows up on the computer by accident. Typically, harmful software or shareware contains it embedded. After this virus becomes active on the computer, it can do a variety of things that can irritate the user. When it detects that the web user is browsing the internet, it often shows pop-up ads and redirects.

Illustration of PUA:Win32/Webcompanion

How does it infect the computer?

PUA:Win32/Webcompanion spreads similarly to malware or computer viruses. Attackers are using a plethora of techniques to disseminate this malicious application. Thus, it was noted that the installation of harmful applications is responsible for the majority of infections. The primary source of the widespread distribution of PUA:Win32/Webcompanion is dubious file-sharing portals and pirated software websites.

In addition to installing malicious software, it was discovered that PUA:Win32/Webcompanion may infiltrate the computer by means of intrusive pop-up advertising, particularly those that seem to be software updates. These fraudulent software update advertisements utilize cunning language and warnings to easily deceive online users into installing PUA:Win32/Webcompanion.

How does this malware operate?

Once PUA:Win32/Webcompanion has gained access to the computer, it will carry out a variety of harmful tasks, such as the following:

  • Put in a bad application or browser extension.
  • Attack the Internet Explorer program and change a few parameters.
  • Open a malicious add-on for your browser.
  • On the internet application, show forceful advertisements and redirections.


A computer’s first indication of PUA:Win32/Webcompanion infection is often a rise in the number of bothersome and unwanted advertisements. Pop-up advertisements may suddenly start to show more often when users are on the internet or even on desktop computers. Because the adware can monitor surfing behaviors, this advertising may be highly targeted depending on the user’s online actions. A typical sign of the existence of PUA:Win32/Webcompanion is also the emergence of additional toolbars and extensions without user knowledge, as well as modifications to the browser’s homepage.

In addition, users can notice a decrease in system speed as a result of the adware using resources to display advertisements. Unwanted adware processes operating in the background may be the cause of slow web page loading times, slow application launching times, or a generally slow computer. To summarize, the first indications of PUA:Win32/Webcompanion infestations are a decline in system speed, changes to browser settings, and an aggressive display of unwanted advertisements.

PUA:Win32/Webcompanion is also detected as:
BitDefender Application.Bundler.Offer.A
Cyren W32/WebCompanion.A.gen!Eldorado
DrWeb Adware.Downware.19998
ESET-NOD32 A Variant Of Win32/Vitzo.A Potentially Unwanted
F-Secure Gen:Variant.Application.Bundler
GData MSIL.Application.WebCompanion.F
Sophos Generic ML PUA
TrendMicro PUA.MSIL.WebCompanion.AE

For more help

There is a family of unwanted programs that includes PUA:Win32/Webcompanion. You may view other threats that are part of this category by going to the PUA malware list.

How to remove PUA:Win32/Webcompanion?

To totally remove PUA:Win32/Webcompanion 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 PUA:Win32/Webcompanion 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 PUA:Win32/Webcompanion, 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 PUA:Win32/Webcompanion 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

Windows 10 / 11 Guide

1. Click on the Windows logo and select the Power icon when options pop up.
2. Select Restart from the options while pressing the Shift key on the keyboard.
3. Choose an Option window will appear. Select the Troubleshoot button.
4. In next window, please choose the Advanced Option.
5. On the Advanced Option window, click on Startup Settings, and then, click the Restart button to reboot the computer.
6. When Windows boots in Startup Settings, press the function key F5 or number 5 on the keyboard.

A simpler alternative for Windows 10 users is to scan the computer with Microsoft Defender Offline. This will run a virus scan in the recovery environment.

Windows 8 Guide

1. Click the Windows Start icon in the lower left section of the screen.
2. Open the Search window and type Advanced in the field. It will open General PC Settings.
3. Click on Advanced Startup, and then click on the Restart Now button.
4. Once the computer starts in the Advanced Startup option menu, select Troubleshoot.
5. Next, click on Advanced Options to reveal the next section.
6. Click Startup settings, and then click the Restart button to boot the PC in Startup Settings.
7. Use function key F5 or number key 5 to Enable Safe Mode with Networking.

Step 2 : Run a virus scanner

To remove PUA:Win32/Webcompanion, 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 PUA:Win32/Webcompanion 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 PUA:Win32/Webcompanion.

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 PUA:Win32/Webcompanion and other suspicious entities. Be sure to remove all identified threats.

Screenshot of Sophos Virus Scan

After executing the above instructions, PUA:Win32/Webcompanion 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.

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 PUA:Win32/Webcompanion. For Windows 8 and 10/11 users, please run Windows Security. Users of Windows Vista and older versions can utilize Microsoft Security Essentials to remove the PUA:Win32/Webcompanion virus.

Windows 8 / 10 / 11 Instructions:

Windows Security is a free tool that was built to help you remove PUA:Win32/Webcompanion, viruses, and other malicious items from Windows 8 or 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 PUA:Win32/Webcompanion. The process may take a while to complete.

5. After the scan, Delete/Quarantine identified threats, whether they were relevant to PUA:Win32/Webcompanion or not. You may now restart Windows to complete the virus removal process.

How to protect the computer from PUA:Win32/Webcompanion?

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 PUA:Win32/Webcompanion 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 PUA:Win32/Webcompanion. 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 PUA:Win32/Webcompanion infection.

Be Careful When Downloading Files

Cracked software, serial key generators, and several freeware are seen as another method that spreads the PUA:Win32/Webcompanion 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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