Trojan:Win32/Mamson.A Malware Removal Instructions

Trojan:Win32/Mamson.A Trojan is a heuristic detection designed to generically detect a Trojan Horse. Due to the generic nature of this threat, we are unable to provide specific information on what it does.

Typical behavior for Trojans like Trojan:Win32/Mamson.A Trojan is one or more of the following:

  • Download and install other malware.
  • Use your computer for click fraud.
  • Record your keystrokes and the sites you visit.
  • Send information about your PC, including usernames and browsing history, to a remote malicious hacker.
  • Give remote access to your PC.
  • Advertising banners are injected with the web pages that you are visiting.
  • Random web page text is turned into hyperlinks.
  • Browser popups appear which recommend fake updates or other software.
Files reported as Trojan:Win32/Mamson.A Trojan may not necessarily be malicious. Should you be uncertain as to whether a file is malicious or a false positive detection, you can submit the affected file to https://www.virustotal.com/en/ to be scanned with multiple antivirus engines.

To check your computer for malware and remove it for free, please use the guide below.

Removal Instructions for Trojan:Win32/Mamson.A Trojan

This malware removal guide may appear overwhelming due to the number of steps and numerous programs that are being used. We have only written it this way to provide clear, detailed, and easy-to-understand instructions that anyone can use to remove malware for free.
Please perform all the steps in the correct order. If you have any questions or doubt at any point, stop and ask for our assistance.
To remove the Trojan:Win32/Mamson.A Trojan, follow these steps:

STEP 1: Start your computer in Safe Mode with Networking

In this first step, we will start your computer in Safe Mode with Networking to prevent Trojan:Win32/Mamson.A Trojan malicious drivers and services from loading at Windows start-up. We’re using Safe mode because it starts Windows in a basic state, using a limited set of files and drivers.

Windows 11Windows 10Windows 7
Before you enter Safe Mode, you need to enter the Windows Recovery Environment (winRE). To do this, follow the below steps:

  1. Press Windows logo key + I on your keyboard to open Settings. If that doesn’t work, right-click on the Start button, then select Settings. In the right window, click on Recovery.
    Go to Windows Settings
  2. Under Advanced startup, select Restart now.
    Recovery window in Windows 10

Now that you are in Windows Recovery Environment, you will follow these steps to take you to safe mode:

  1. On the Choose an option screen, select “Troubleshoot“.
    Windows 11 - Start in Safe Mode with Network
  2. On the “Troubleshoot” screen, click the “Advanced Options” button.
    Windows 11 - Start in Safe Mode with Network - Step 2
  3. On the “Advanced Options” page, click the “Startup Settings” option.
    Windows 11 - Start in Safe Mode with Network - Step 3
  4. On the “Startup Settings” page, click the “Restart”.
    Windows 11 - Start in Safe Mode with Network - Step 4
  5. After your device restarts, you’ll see a list of options. Select option 5 from the list or press F5 to enter Safe Mode with Networking.
    Boot in Safe Mode Windows 11
  6. While your computer is running in Safe Mode with Networking, we will need to download, install and run a scan with Malwarebytes (explained in Step 2).
Before you enter Safe Mode, you need to enter the Windows Recovery Environment (winRE). To do this, follow the below steps:

  1. Press the Windows logo key + I on your keyboard to open Settings. If that doesn’t work, select the Start button, then select Settings.
    Go to Windows Settings
  2. When the Windows Settings window opens, select Update & Security, then click on Recovery.
    Recovery window in Windows 10
  3. Under Advanced startup, select Restart now.
    Open Advance Startup

Now that you are in Windows Recovery Environment, you will follow these steps to take you to safe mode:

  1. On the Choose an option screen, select “Troubleshoot“.
    Windows 10 - Start in Safe Mode with Network
  2. On the “Troubleshoot” screen, click the “Advanced Options” button.
    Windows 10 - Start in Safe Mode with Network - Step 2
  3. On the “Advanced Options” page, click the “Startup Settings” option. In Windows 8, this option is labeled “Windows Startup Settings” instead.
    Windows 10 - Start in Safe Mode with Network - Step 3
  4. On the “Startup Settings” page, click the “Restart”.
    Windows 10 - Start in Safe Mode with Network - Step 4
  5. After your device restarts, you’ll see a list of options. Select option 5 from the list or press F5 to enter Safe Mode with Networking.
    Boot in Safe Mode Windows 10
  6. While your computer is running in Safe Mode with Networking, we will need to download, install and run a scan with Malwarebytes (explained in Step 2).
  1. Remove all floppy disks, CDs, and DVDs from your computer, and then restart your computer.
  2. When the computer starts you will see your computer’s hardware being listed. When you see this information start to press the F8 key repeatedly until you are presented with the Advanced Boot Options.
    F8 Safe Mode
  3. In the Advanced Boot Options screen, use the arrow keys to highlight Safe Mode with Networking and then press Enter.
    Safe Mode with Networking screen
  4. While your computer is running in Safe Mode with Networking, we will need to download, install and run a scan with Malwarebytes (explained in Step 2). In some cases, victims may have issues while trying to start the computer in Safe Mode with Networking, if this happens, you can try to scan your computer with Malwarebytes in normal mode.

STEP 2: Use Malwarebytes to remove Trojan:Win32/Mamson.A Trojan

While the computer is in Safe Mode with Networking, we will download, install and run a system scan with Malwarebytes.

Malwarebytes Free is one of the most popular and most used anti-malware software for Windows and for good reasons. It is able to destroy many types of malware that other software tends to miss, without costing you absolutely nothing. When it comes to cleaning up an infected device, Malwarebytes has always been free and we recommend it as an essential tool in the fight against malware.

  1. Download Malwarebytes.

    You can download Malwarebytes for Windows by clicking the link below.

    MALWAREBYTES DOWNLOAD LINK
    (The above link will open a new page from where you can download Malwarebytes)
  2. Double-click on the Malwarebytes setup file.

    When Malwarebytes has finished downloading, double-click on the MBSetup file to install Malwarebytes on your computer. In most cases, downloaded files are saved to the Downloads folder.

    Double-click on MBSetup installer to install Malwarebytes
    You may be presented with a User Account Control pop-up asking if you want to allow Malwarebytes to make changes to your device. If this happens, you should click “Yes” to continue with the Malwarebytes installation.
    Windows asking for permission to run the Malwarebytes installer

  3. Follow the on-screen prompts to install Malwarebytes.

    When the Malwarebytes installation begins, you will see the Malwarebytes setup wizard which will guide you through the installation process. The Malwarebytes installer will first ask you what type of computer are you installing this program on, click either Personal Computer or Work Computer.
    Malwarebytes setup: Click on Personal Computer step 1

    On the next screen, click “Install” to install Malwarebytes on your computer.
    Malwarebytes Setup: Click on Install

    When your Malwarebytes installation completes, the program opens to the Welcome to Malwarebytes screen. Click the “Get started” button.

  4. Click on “Scan”.

    To scan your computer with Malwarebytes, click on the “Scan” button. Malwarebytes will automatically update the antivirus database and start scanning your computer for malware.
    Click on Scan button to remove Trojan:Win32/Mamson.A Trojan virus

  5. Wait for the Malwarebytes scan to complete.

    Malwarebytes will scan your computer for the Trojan:Win32/Mamson.A Trojan and other malicious programs. This process can take a few minutes, so we suggest you do something else and periodically check on the status of the scan to see when it is finished.
    Malwarebytes scanning for Trojan:Win32/Mamson.A Trojan virus

  6. Click on “Quarantine”.

    When the scan has been completed, you will be presented with a screen showing the malware infections that Malwarebytes has detected. To remove the Trojan:Win32/Mamson.A malicious files that Malwarebytes has found, click on the “Quarantine” button.
    Review the malicious programs and click on Quarantine to remove Trojan:Win32/Mamson.A Trojan virus

  7. Restart computer.

    Malwarebytes will now remove the Trojan:Win32/Mamson.A Trojan malware and other malicious programs that it has found. To complete the malware removal process, Malwarebytes will ask you to restart your computer.
    Malwarebytes requesting to restart computer to complete the Trojan:Win32/Mamson.A Trojan removal process

    When the malware removal process is complete, your computer should start in normal mode (if not, simply restart your device to exit Safe Mode) and continue with the rest of the instructions. We do recommend that you run another scan with Malwarebytes once you’re in Normal mode to make sure all the malicious files were removed.

STEP 3: Scan and clean your computer with HitmanPro

In this third step, while the computer is in normal back, we will download and run a scan with HitmanPro to remove the Trojan:Win32/Mamson.A Trojan and other malicious programs.

HitmanPro is a second opinion scanner that takes a unique cloud-based approach to malware scanning. HitmanPro scans the behavior of active files and also files in locations where malware normally resides for suspicious activity. If it finds a suspicious file that’s not already known, HitmanPro sends it to its clouds to be scanned by two of the best antivirus engines today, which are Bitdefender and Kaspersky.

Although HitmanPro is shareware and costs $24.95 for 1 year on 1 PC, there is actually no limit on scanning. The limitation only kicks in when there is a need to remove or quarantine detected malware by HitmanPro on your system and by then, you can activate the one-time 30-days trial to enable the clean up.

  1. Download HitmanPro.

    You can download HitmanPro by clicking the link below.

    HITMANPRO DOWNLOAD LINK
    (The above link will open a new web page from where you can download HitmanPro)
  2. Install HitmanPro.

    When HitmanPro has finished downloading, double-click on “hitmanpro.exe” (for 32-bit versions of Windows) or “hitmanpro_x64.exe” (for 64-bit versions of Windows) to install this program on your PC. In most cases, downloaded files are saved to the Downloads folder.
    Double-click on the HitmanPro setup file - Help Guide
    You may be presented with a User Account Control pop-up asking if you want to allow HitmanPro to make changes to your device. If this happens, you should click “Yes” to continue with the installation.
    Windows asking for permissions to run the HitmanPro setup file - Help Guide

  3. Follow the on-screen prompts.

    When HitmanPro starts you will be presented with the start screen as shown below. Click on the “Next” button to perform a system scan.

    Click Next to install HitmanPro to remove Trojan:Win32/Mamson.A Trojan virus

    HitmanPro final installer screen

  4. Wait for the HitmanPro scan to complete.

    HitmanPro will now begin to scan your computer for the Trojan:Win32/Mamson.A Trojan and other malicious programs. This process will take a few minutes.
    HitmanPro while scanning Trojan:Win32/Mamson.A Trojan

  5. Click on “Next”.

    When HitmanPro has finished the scan, it will display a list of all the malware that the program has found. Click on the “Next” button to remove the Trojan:Win32/Mamson.A Trojan and other malicious programs.
    HitmanPro scan summary. Click Next to delete the Trojan:Win32/Mamson.A Trojan

  6. Click on “Activate free license”.

    Click on the “Activate free license” button to begin the free 30 days trial and remove the Trojan:Win32/Mamson.A Trojan and other malicious files from the computer.
    Activate the free HitmanPro license keyEnter your email to complete the HitmanPro activation - Help Guide

    When the process is complete, you can close HitmanPro and continue with the rest of the instructions.


STEP 4: Double-check for malicious programs with Emsisoft Emergency Kit

In this fourth step, we will scan the computer with Emsisoft Emergency Kit to remove any leftover files from the Trojan:Win32/Mamson.A Trojan and other malicious programs.
While the Malwarebytes and HitmanPro scans are more than enough, we’re recommending Emsisoft Emergency Kit to users who still have malware-related issues or just want to make sure their computer is 100% clean.

Emsisoft Emergency Kit is a free second opinion scanner that can be used without installation to scan and clean infected computers. Emsisoft scans the behavior of active files and also files in locations where malware normally resides for suspicious activity.

  1. Download Emsisoft Emergency Kit.

    You can download Emsisoft Emergency Kit by clicking the link below.

    EMSISOFT EMERGENCY KIT DOWNLOAD LINK
    (The above link will open a new web page from where you can download Emsisoft Emergency Kit)
  2. Install Emsisoft Emergency Kit.

    Double-click on the EmsisoftEmergencyKit setup file to start the installation process, then click on the “Install” button.
    Click on the Install button

  3. Start Emsisoft Emergency Kit.

    On your desktop, the “EEK” folder (C:\EEK) should now be open. To start Emsisoft, click on the “Start Emsisoft Emergency Kit” file to open this program.
    Click on Start Emsisoft Emergency Kit to remove the Trojan:Win32/Mamson.A Trojan

    You may be presented with a User Account Control dialog asking you if you want to run this file. If this happens, you should click “Yes” to continue with the installation.
    Allow Emsisoft to run on your PC - UAC

  4. Click on “Malware Scan”.

    Emsisoft Emergency Kit will start and it will ask you for permission to update itself. Once the update process is complete, click on the “Scan” tab, and perform a “Malware Scan“.

    Perform a Malware Scan with Emsisoft Emergency Kit
    Emsisoft Emergency Kit will now scan your computer for the Trojan:Win32/Mamson.A malicious files. This process can take a few minutes.
    Emsisoft Emergency Kit Scanning for the Trojan:Win32/Mamson.A Trojan

  5. Click on “Quarantine Selected”.

    When the Emsisoft scan has finished, you will be presented with a screen reporting which malicious files were detected on your computer. To remove the Trojan:Win32/Mamson.A Trojan, click on the “Quarantine Selected“.
    Click on Quarantine Selected to remove the Trojan:Win32/Mamson.A virus
    When the malware removal process is complete, Emsisoft Emergency Kit may need to restart your computer. Click on the “Restart” button to restart your computer.

    When the process is complete, you can close Emsisoft and continue with the rest of the instructions.


STEP 5: Use AdwCleaner to remove malicious browser policies

In this final step, we will use AdwCleaner to remove malicious browser policies and unwanted browser extensions from your computer.

AdwCleaner is a free popular on-demand scanner that can detect and remove malware that even the most well-known anti-virus and anti-malware applications fail to find. This on-demand scanner includes a lot of tools that can be used to fix the side effects of browser hijackers.

  1. Download AdwCleaner.

    You can download AdwCleaner by clicking the link below.

    ADWCLEANER DOWNLOAD LINK
    (The above link will open a new web page from where you can download AdwCleaner)
  2. Double-click on the setup file.

    Double-click on the file named “adwcleaner_x.x.x.exe” to start AdwCleaner. In most cases, downloaded files are saved to the Downloads folder.
    AdwCleaner Setup File
    You may be presented with a User Account Control dialog asking you if you want to run this file. If this happens, you should click “Yes” to continue with the installation.
    AdwCleaner and Windows User Account Control Pop-up

  3. Enable “Reset Chrome policies”.

    When AdwCleaner starts, on the left side of the window, click on “Settings” and then enable “Reset Chrome policies“.
    Enable Reset Chrome policies

  4. Click on “Scan Now”.

    On the left side of the window, click on “Dashboard” and then click “Scan Now” to perform a system scan.
    AdwCleaner Scan Now button

  5. Wait for the AdwCleaner scan to complete.

    AdwCleaner will now scan your computer for the Trojan:Win32/Mamson.A Trojan and other malicious programs. This process can take a few minutes.
    AdwCleaner Scanning for Trojan:Win32/Mamson.A Trojan and other malicious programs

  6. Click on “Clean & Repair”.

    When AdwCleaner has finished it will display a list of all the malware that the program found. Click on the “Clean & Repair” button to remove the Trojan:Win32/Mamson.A Trojan and other malicious programs from your computer.
    Click Clean to remove Trojan:Win32/Mamson.A Trojan

  7. Click on “Clean & Restart Now”

    When the malware removal process is complete, AdwCleaner may need to restart your device. Click on the “Clean & Restart Now” button to finish the removal process.
    Click Clean & Restart Now to get rif of Trojan:Win32/Mamson.A Trojan


Your computer should now be free of the Trojan:Win32/Mamson.A Trojan and other malicious programs. If your current antivirus allowed this malicious program on your computer, you may want to consider purchasing the full-featured version of Malwarebytes Anti-Malware to protect against these types of threats in the future.
If you are still having problems with your computer after completing these instructions, then please follow one of the steps:

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