How to Remove Trojan:Win64/Sirefef.D

Trojan:Win64/Sirefef.D is a malicious computer threat, consisting of malicious codes. Many antivirus programs can detect this threat but cannot delete it. This is the reason why it can stay long on your computer and mess up your system. How much do you know about Trojan:Win64/Sirefef.D? It would be better to understand what the Trojan virus before fixing the problem.

Trojan:Win64/Sirefef.D Description

Trojan:Win64/Sirefef.D is a vicious Trojan virus that exploits the system loopholes to infect a targeted computer. Usually, your computer may be attacked by it when you visit some malicious websites, download insecure programs or files from the Internet and click on the attachments or links from spam emails. It is able to enter your computer without any awareness and permission. To stop it inserting into system, users must think twice before acting.

After the Trojan finishes embedding its malicious components to the target computer, some weird symptoms on the PC will gradually show up. It will severely reduce ths system performance and slow down the network speed through the way of consuming huge sum of system resources to perform harmful tasks. Your computer may encounter Blue Screen of Death when you attempt to play games, watch videos or open other programs. It will makes a backdoor to allow more viruses get into your system without your consent. Further, the Trojan virus gives the access to remote intruder to get inside the system and monitor the entire of you do on the PC. Users’ identity information, financial data, account management and other sensitive statistics will be in high risk. Many users try to remove the Trojan by using antivirus programs to delete the virus. Hence, it gets that how the antivirus proram acts. You can see what are the specific viruses on the computer, especially Trojan:Win64/Sirefef.D. You shouldn’t modify the system immediately, hence, you may fail to eliminate the malware. For a better computing environment, you should consider removing Trojan:Win64/Sirefef.D as early as possible.

How to Remove Trojan:Win64/Sirefef.D

Since this threat is able to block the antivirus programs and avoid being removed by them, you can choose to delete its malicious files manually if you are experienced on virus removal. Once any mistakes occur during the removal process, it will result in unexpected system damage, so you may need to create a whole backup for system files. The following are the steps to manually remove the Trojan horse:

Step one: Boot up your computer in safe mode.
1) Restart your affected computer and hit F8 key multiple times before Windows Advanced Options Menu starts.
2) Use the up and down arrow keys to navigate the "Safe Mode with Networking" option when the Windows starts. And then hit Enter key to process.

Step two: Eliminate show hidden files and folders.
Open Control Panel from Start menu and go to Folder Options.

Under View tab, check Show hidden files and folders and non-check Hide protected operation system files (Recommended). Finally, click OK.

Search for and eliminate all the following files created by the Trojan from your PC.

%AllUsersProfile%\[random]
%AppData%\Roaming\Microsoft\Windows\Templates\[random]
%AppData%\Local\[random].exe

Step three: Kill the process related to the Trojan in Windows Task Manager.
Right-click on the taskbar (or press CTRL+SHIFT+ESC keys together) to start Windows Task Manager.
Navigate to the Processes tab, search for its running processes of the Trojan and then kill them by clicking on “End Process” button.

Step four: Remove the registry entries of the Trojan.
Press Windows + R keys and input regedit into the box and then click OK to open Registry Editor.

When Registry Editor opens, search for and remove all the registry entries of the Trojan. You’d better make a backup of your registry in case of data loss.

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\[RANDOM CHARACTERS].exe
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run ‘Random’
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Random

Step five: After all the steps are done, please reboot your computer normally to apply all changes.


Many Trojans can spread in a number of ways, so you should keep the following rules in mind to avoid being infected with them. Please get rid of it without delay as soon as you find it. It may bring others virus into your computer without your permission if it is not removed in time. Currently, most of the malware have the ability to distribute themselves through hacked legal websites, freeware downloads, unknown links on web pages and spam email attachments. So, you should not download the attached files/programs or click on the links when receive strange emails from unknown people. What’s worse, its main purpose is to steal your important information and tend to gain financial benefit from you. In addition, don’t click on the pop-up ads or links in porn sites or other illicit websites because many viruses lurk there. In addition, please develop a good habit of using the computer, which help your computer avoid lots of trouble.