Trojan:Win32/Dynamer!ac

Trojan:Win32/Dynamer!ac is a threat identified by Microsoft Security Software. This is a typical malware that targets the core system of Windows in order to complete its tasks. Trojan:Win32/Dynamer!ac was made to execute a series of commands once it gets inside the system. It will gather data like system settings, Windows version, network configuration, and so on. Collected data will be sent to remote attacker for analysis.

Threat behavior

Installation

In general, system will get infected with Trojan:Win32/Dynamer!ac if malicious code is executed on the computer. Source of this trojan may vary due to the changing ways how it is deployed. Typically, spam email messages disguising as open letter from reputable institution are used to deceive recipients. Body of the message contains enticing phrases that tries to convince user into opening the attached file.

Malicious links from social media sites and instant messaging program are also seen as method used in distributing Trojan:Win32/Dynamer!ac. Illegally distributed software and media materials may also contain code that can lead to the infection of this malware.

How does this malware operate?

In order to run itself on Windows start-up, Trojan:Win32/Dynamer!ac will make a copy of itself under system files. Then, registry entry is created to call the file on each Windows boot-up. Apart from that, this malware will also drop non-malicious files on various folders of the compromised PC.

Trojan:Win32/Dynamer!ac occasionally connects to a remote host to execute tasks like the following:

  • Notify attacker on the new infection
  • Sends gathered data from the infected computer
  • Download and execute additional files including an updated version of the Trojan
  • Accept command from a remote attacker

Symptoms

There is not much obvious symptom from this malware. Trojan:Win32/Dynamer!ac operates silently in the background. However, Microsoft Security Software may alert you on the presence of this Trojan.

How to remove Trojan:Win32/Dynamer!ac?

To totally remove Trojan:Win32/Dynamer!ac 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.

Step 1 : Scan the PC with Combo Cleaner for Windows

Combo Cleaner is a trusted computer security and optimization tool equipped with a powerful virus and malware detection engine. This program can get rid of computer virus like Trojan:Win32/Dynamer!ac 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.

4. At the end of the setup process, click Finish to run Combo Cleaner.

5. The tool will update the database file; please wait for this process to complete.

6. To begin checking for threats like Trojan:Win32/Dynamer!ac, click on the Start Scan button. Wait for this scan to finish.

Screenshot of Combo Cleaner PC

7. At the end of the scan process, click on Remove all threats to delete Trojan:Win32/Dynamer!ac malware, including all malicious objects from the computer.

To fully optimize the features of antivirus and privacy scanners, users may have to upgrade to the premium version.

Please continue with the succeeding removal procedures if you are comfortable manually getting rid of the computer virus and malicious items linked to it.

Step 2 : Start Windows in Safe Mode With Networking

The method of running Windows in Safe Mode before running a virus scan is effective in getting rid of Trojan:Win32/Dynamer!ac. This process can prevent most viruses and malware from loading, making it easier to detect and remove them.

1. On the Windows Search bar, please type msconfig.

Screenshot of Win 11 Search

2. Select and open System Configutation on the list of found results.

3. Once you are in the System Configuration window, go to the Boot tab.

Screenshot of Msconfig Win 11

4. Under the Boot Options area, please check Safe Boot so that it starts in Safe Mode after restarting.

5. Next, select Network. This will allow Windows to boot in Safe Mode with Networking.

6. Lastly, click on Apply and OK to save the changes.

7. Please restart Windows.

Do not forget to restore the normal boot process of Windows after running the virus scan. Simply repeat the method above, and this time, uncheck the Safe Boot option to run Windows normally.

Step 3 : Run Sophos Home Virus Scanner

To remove Trojan:Win32/Dynamer!ac automatically, scanning the computer with this powerful virus and malware removal tool is recommended. This scanner does not just uncover known threats like viruses or malware; it is also effective in discovering harmful files associated to Trojan:Win32/Dynamer!ac.

1. Please click on the link below to download the program.

2. After downloading, locate the file SophosInstall.exe in the Downloads folder.

3. Install by double-clicking on the file.

4. If it prompts "Do you want to allow this app to make changes on your device?" please click Yes.

5. Next, it will display the Terms and Conditions page. Click the Install button to begin.

Screenshot of Terms by Sophos Home

6. Run the installation with the default settings. Please note that an internet connection is required in order to download important updates.

7. After finishing the installation, you must login to the dashboard. If you already have a Sophos account, please login. Otherwise, please enter your details and click on the Create Account button.

8. Once you are in the Sophos Home console, click the Scan button to start checking the computer for Trojan:Win32/Dynamer!ac components.

Screenshot of Sophos Home

9. Scanning may take a while; please wait for this process to finish.

10. After scanning the computer, Sophos Home will start cleaning or deleting files infected with Trojan:Win32/Dynamer!ac.

11. You may now close Sophos Home. The computer is now free from Trojan:Win32/Dynamer!ac, as well as associated malware and viruses.

After executing the above instructions, Trojan:Win32/Dynamer!ac 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.

Another alternative for Windows 10/11 users is to scan the computer with Microsoft Defender Offline. This will run a virus scan in the recovery environment.

Step 4 : 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 Trojan:Win32/Dynamer!ac. For Windows 10/11 users, please run Windows Security.

Windows 10 / 11 Instructions:

Windows Security is a free tool that was built to help you remove Trojan:Win32/Dynamer!ac, viruses, and other malicious items from Windows 10/11 systems. Follow these procedures to scan your computer with the tool:

1. Tap or click the Search charm and search for Windows Security

2. Click Open to run the program.

Screenshot of Win 11 Search

3. On the Dashboard, click Virus and threat protection from the sidebar.

Screenshot of Win 11 Virus Protection

4. On the right panel, click on Scan Options to see different levels of checking the computer.

5. Next, please select Full Scan button.

Screenshot of Full Scan Win 11

6. Lastly, click on the Scan now button to start scanning for the presence of Trojan:Win32/Dynamer!ac. The process may take a while to complete.

7. After the scan, Delete/Quarantine identified threats, whether they were relevant to Trojan:Win32/Dynamer!ac or not. You may now restart Windows to complete the virus removal process.

For Windows 8.1 and Windows 7, you can scan the computer for free with the Microsoft Malicious Software Removal Tool (MSRT 64-Bit). It is a stand-alone virus scanner tool that targets prevalent malware groups.

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16 thoughts on “Trojan:Win32/Dynamer!ac”

  1. I have already used the Windows Defender. And well it went away for about a half hour then showed right back up it never really went away. any other Ideas. I am just about to the point of reloading the system.

  2. Same problem – I keep finding and deleting/ quarantining it with windows defender, but it keeps coming back. I also have Malwarebytes, so maybe I should give a full scan with both?

  3. @Raven, try to run full scan on the computer. Also, rebooting Windows in Safe Mode before running the scan may give you positive results.

  4. After using Windows Defender in Safe Mode, I ran Kaspersky TDSSKiller and it did not find the the virus so it does appear at this point that Defender did do its job (in Safe Mode).

  5. I have done 3 full scans with defender windows and every time I have quarantine and removed and it keeps coming back! What else can I do?

  6. Windows Defender is powerless against this. It has frozen 3 times for several hours each in the process of removing software from my laptop.

  7. David
    January 25, 2016

    After using Windows Defender in Safe Mode, I ran Kaspersky TDSSKiller and it did not find the the virus so it does appear at this point that Defender did do its job (in Safe Mode).

    Did any of you people got rid of this?

  8. Dynamer is relatively easy to remove by first killing the process with Task Manager and then running “rd “\\.\%appdata%\com4.{241D7C96-F8BF-4F85-B01F-E2B043341A4B}” /S /Q” in the command line.

  9. T3POX — sounds like you have the solution but I’m not very literate. What do you mean by “kill the process”? I went into task manager and cannot identify an appropriate program to kill.

  10. I have done 4 or 5 times full scans with defender windows and every time I have quarantine and removed and it keeps coming back! What else can I do?

  11. T3POX I entered in the command prompt your suggestion but get error is not recognized as an internal or external command, operable program or batch file. Any thoughts?

  12. I have run Windows defender twice and it keeps on finding Trojan Dynamer even after removal… what next for me?

  13. I removed it from mine ,,, first before you even start the windows defender scan , only defender can remove it ..
    windows 10 I have , but it should work the same on any other ,
    OPEN task manager go to services , find volume shadow copy IT MUST BE RUNNING OK .. DO NOT CLOSE THAT WINDOW
    it MUST stay open ..
    then start the defender scan once the scan is finished make Shure the volume shadow is still running if u close that window it might stop ,it needs to be running ,
    then get defender to remove it ,
    it should work first time but could take 3 times though it worked for me and it took me ages to work this out , hope it helps you ..

  14. vince ciarametaro

    I tried Craig Kasch method, not only did it not work it made things worse.

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