Remove Trojan.Win64/Sirefef.W Permanently (Manual Removal Guide)

Microsoft Security Essentials keeps reporting Trojan.Win64/Sirefef.W? Are you annoyed with this stubborn virus as it comes back again and again? Learn more here to find an effective solution to delete it permanently.

Trojan.Win64/Sirefef.W Description:

Trojan.Win64/Sirefef.W is a nasty Trojan targets every computer users that range from individual, educational institutions, up to known organizations with 64 bits. It degrades overall computer stability and performance after it is downloaded. This Trojan always wastes too much computer resources and conflicts with installed applications, finally makes computer at high risk. Although it can be detected by Microsoft Security Essentials, it still seems to be returning everytime you remove it.

There are many copies of this Trojan such as Trojan:Win64/Sirefef.K and Trojan:Win64/Sirefef.C, both of them will create a backdoor and connect to a remote server without your permission, allowing a remote attacker to gain control on the compromised computer. What’s worse, it will drop harmful files and make several changes on computer settings so that it is not surprised that your PC is running out of order. It is getting slower and slower or even frozen all the time. Besides, when your computer is compromised, you may find when surf online, it displays numerous annoying advertisements to annoy you. Hence, if you want to get away from security risk, you should get rid of Trojan.Win64/Sirefef.W as soon as possible to make sure your machine is running in safe network environment.

Trojan infected symptoms:

It can bypass the legit security tools and destroy your computer secretly.

It prevents you from opening some application because the files are corrupted.

It can make your browser redirected to all kinds of malicious websites.

It is able to allow remote hacker access the compromised system for illicit purpose.

Note: Trojan.Win64/Sirefef.W is a highly dangerous Trojan created by the internet hackers and infects your computer through vulnerability or security program exploits. Once found, an immediate removal is needed. You can chat with an expert now to further know about this virus.


Trojan.Win64/Sirefef.W can infect via many ways:

From malicious drive-by-download scripts from corrupted porn and shareware / freeware websites.

Through spam email attachments, media downloads and social networks.

When clicking suspicious popups or malicious links.

Open unknown email or download media files that contain the activation code of the virus.

Note: No matter how does the virus access your PC, users should know that there are no tools can remove this virus automatically at this moment, it is suggested users not spend much time in downloading or paying any security software which claims can delete this stubborn virus. It is totally useless. To completely get rid of this pest, professional manual guide is needed.

Manual Removal Guides:

1. Reboot your computer to safe mode with networking. As your computer restarts but before Windows launches, tap “F8” key constantly.

2. Show hidden files and folders.

Open Folder Options by clicking the Start button, clicking Control Panel, clicking Appearance and Personalization, and then clicking Folder Options.

Click the View tab.

Under Advanced settings, click Show hidden files and folders, uncheck Hide protected operating system files (Recommended) and then click OK.

3. Open Registry entries. Find out the malicious files and entries and then delete all.

Attention: Always be sure to back up your PC before making any changes.

a. Press the “Start” button and then choose the option “Run”. In the “Open” field, type “regedit” and click the “OK” button.

b. All malicious files and registry entries that should be deleted:

%UserProfile%\Desktop\[FOLDER NAME]
%UserProfile%\Start Menu\[FOLDER NAME]
%UserProfile%\My Documents\[FOLDER NAME]
%UserProfile%\Start Menu\Programs\[FOLDER NAME]
%UserProfile%\Start Menu\Programas\[FOLDER NAME]
HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System “DisableRegedit” = 0
HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System “DisableRegistryTools” = 0
HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System “DisableTaskMgr” = 0

Video Shows You How to Safely Modify Windows Registry Editor:

Manual removal of Trojan.Win64/Sirefef.W requires Expertise, Please take care before performing the steps. If you failed to remove this Malware, you are welcome to contact PC expert to fix the problem.

Published by on June 7, 2012 12:36 pm, last updated on August 18, 2012 4:19 am

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