Trojan:Win32/Rozena is a detection for a computer virus that infects the system to perform administrative actions. It can enter the computer if the user frequently visits a malicious website or downloads any executable file from the mentioned location. Trojan:Win32/Rozena can also be dropped by another Trojan infection or malware. If anti-virus application on the computer identifies the presence of the virus, it denotes that computer files are in great danger as Trojan:Win32/Rozena can perform an advanced encryption method to lock the entire target types of data.

Illustration for Trojan:Win32/Rozena

How does it infect the computer?

Trojan:Win32/Rozena is normally downloaded from the internet and the majority of computer users are not aware of this source of virus infection. Aside from running a malicious script that can inject the virus on a visitor’s computer, it can host a carrier file that users may download and execute on their device.

There have been cases where Trojan:Win32/Rozena contamination is caused by another virus infection that was designed and deployed to infect the computer with various types of malware. In this case, regularly scanning the computer may help reduce the risks of Trojan:Win32/Rozena infection and as a result, you may save important files from being encrypted.
Once Trojan:Win32/Rozena is active on the computer, it drops the file Time.txt from the System folder. Then, the virus creates an auto-start method by adding a Windows registry such as the following:

App = “{Executable Path of the Ransomware}\{Malware Name}.exe”

How does this malware operate?

Following the execution, it generates a new user account with a unique name and password and adds it to the Administrators group. It saves itself to the System folder of Windows (%System%) under an arbitrary name.

To automatically launch every time the system boots up, the Trojan program inserts a link to its file in the system registry’s autorun key, as shown in the details below.


Hidden files and folders will not be shown and will remain deactivated to avoid the removal of Trojan:Win32/Rozena.


A suspicious Windows user added to the Administrators group is one visible sign that the computer is infected with Trojan:Win32/Rozena. Aside from that, antivirus application may frequently display a warning to remind users that virus scanning is needed to remove the virus.

Other Versions of Trojan:Win32/Rozena
Version Name Alert Level Date Added
Trojan:Win32/Rozena.NB Severe May 1, 2024
Behavior:Win32/Rozena.A Severe Dec. 15, 2021

How to remove Trojan:Win32/Rozena?

To totally remove Trojan:Win32/Rozena 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 Trojan:Win32/Rozena 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 Trojan:Win32/Rozena, 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 Trojan:Win32/Rozena virus, 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 virus and malicious items linked to it.

Step 1 : 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/Rozena. 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 MSConfig Command

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 SafeBoot

4. Under the Boot Options area, please check Safe Boot and select Network. This will allow Windows to boot in Safe Mode with Networking.

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

6. 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 2 : Run Sophos Home Virus Scanner

To remove Trojan:Win32/Rozena, 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 Trojan:Win32/Rozena or similar attacks, you can activate Sophos to have real-time scanning and complete defense against all forms of threats.

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 Sophos Home Terms and Conditions

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 dashboard, click the Scan button to start checking the computer for Trojan:Win32/Rozena components.

Screenshot of Sophos Home Dashboard

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/Rozena.

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

After executing the above instructions, Trojan:Win32/Rozena 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 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 Trojan:Win32/Rozena. 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/Rozena, 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, 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 Trojan:Win32/Rozena. The process may take a while to complete.

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

For older versions of Windows, 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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