May 25, 2013

Trojan:WinNT/Sirefef.N – How To Guide

Got infected with Trojan:WinNT/Sirefef.N and do not know how to remove it completely? Does your anti-virus software perform normally to delete the virus entirely? If not, how to delete this nasty virus successfully and completely? Learn from this post and follow removal guide below to remove the Trojan horse safely.

Detailed Description of Trojan:WinNT/Sirefef.N

Trojan:WinNT/Sirefef.N is known as a new member of Trojan family. The way it usually modifies the infected system is to patch your legitimate user32.dll Windows file, and then changes the registry key to another key. After that, it will start up on boot and evades security software scanning. Even though sometimes it can be detect by some anti-virus and you select remove option, when you re-scan after a while, it comes up again. Because it takes over the entire system very soon then starts to implement all kinds of harmful activities on the background without your consent.

It detects system file once it got into the infected computer. It puts all of your personal information in a high risk. It will contact remote servers to download more harmful threaten items and install into your system that enables hackers to monitor the compromised computer remotely. It can also slow down the performance of your computer. If it stays long enough, it will cause computer freezing or system damages. In a word, it needs to be ended and removed immediately before it causes more damages.

Note: The following instructions require certain levels of computer skills. If you’re not sure how to delete this harmful Trojan, you can start a live chat with YooCare experts now.

Infected Symptoms Of Trojan WinNT/Sirefef.N:

※ It will allow cyber-criminals to break into the infected computer without noticed

※ It disables executable program and cause system crash

※ It will change your registry settings and key value which makes it hard to be removed

※ It will display numerous fake infections of exaggerated security threats

※ It violates your privacy and records your data in the infected computer.

Instructions on removing this virus completely :

Manual removal is a complicated and risky process, so please back up all important data before making any changes on your computer. Here are some instructions to handle with the Trojan horse manually, and be cautious when going through the following steps.

1. Press Ctrl+Alt+Del keys together and stop processes of this virus in the Windows Task Manager.


2. Go to Folder Options from Control Panel. Under View tab, select Show hidden files and folders and uncheck Hide protected operating system files (Recommended), and then click OK. Remember to back up beforehand.


3. Press Windows+ R keys and search for regedit in Run. Delete associated files and registry entries related to Trojan:WinNT/Sirefef.N from your PC completely as follows:

%USERPROFILE%\Start Menu\Programs\StartUp\runctf.lnk
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings “CertificateRevocation” = ’0′
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments “SaveZoneInformation” = ’1′

4. Reboot the computer normally to take effective, when the above steps are done.

This Video Shows You How to Safely Modify Windows Registry Editor:


Trojan:WinNT/Sirefef.N is classified as a destructive Trojan horse infection which is able to sneak into target computers without consciousness. It is known as a stubborn virus that would modify critical system files and mess up the infected computer. Another negative result it brings to your computer is slowing down your computer performance by loading large amount of process to eat up all the memories. This includes opening programs, shutting down your computer, and slowing down Internet speed by loading lots of processes on the infected computer. It conceals key loggers that use to record every key stroke you have pressed and released. It contains lots of ad-wares.

Friendly Reminder:If you still find it hard to follow the removal guide above smoothly, please contact YooCare: PC experts 24/7 online will offer you the most effective tech support to remove infection completely.

Published by & last updated on May 25, 2013 11:07 am

Leave a Reply

Problems with your PC, Mac or mobile device?

Live Chat Now

Thanks for using YooCare Services!

Here're some of the support team members who are passionate about their works and support our customers 24/7.

As Seen On