System attacked by the Trojan:Win64/Sirefef.AL virus? Can your antivirus get rid of this threat? Where can one get this Trojan infection when there’s antivirus protection on the computer? Has anything bad already happened to the computer to cause it run extremely slow? How to stop the constant security pop up alerts? What is the best way to remove this Trojan infection without coming back?

Trojan:Win64/Sirefef.AL – How to Remove Trojan Virus

Trojan:Win64/Sirefef.AL is a Trojan serial member from the Win64/Sirefef group. This Trojan infection, similar to Trojan:Win64/Sirefef.AK, is specifically used by computer hackers to perform all kinds of chaos on the targeted computers and to collect sensitive data to conduct some unknown illegal activities online. In other words, victims of this Trojan infection can face privacy security issues. And with the ability to escape from many antivirus protection tools, this Trojan virus can sneak into computers with Windows OS without consent. It should be got rid of ASAP once being found in the system to prevent all the potential damage from happening.

This Trojan:Win64/Sirefef.AL virus is believe to bundle with many resources on the Internet including fishy web sites and pages, free programs and spam email attachments. Hence, it can be distributed over the networks to attack PCs located in different areas. System default structures can be modified by this Trojan virus upon install for its own good so that it can automatically launch as a part of the start-up process each time the infected computer is turned on. Soon, you will come across difficulties on using the computer to perform daily work or activities like surfing the Internet because system is rather stuck and stops responding more often. In the meantime, you can also get constant security pop ups which may end up prompting certain malware so as to scam money from you. The fact is, these security alerts do not truly present the actual status of your computer. Also, when you check under Windows Task Manger, CPU usage percentage can be rather high while running processes do not show abnormal activities. That’s because the Trojan:Win64/Sirefef.AL virus can hide deep down inside the system.

While you are experiencing all the above consequences, the worst damage would be this Trojan infection helping online third parties access the infected computers remotely and steal valuable information to conduct some cyber fraud activities. This can be done by the Trojan virus by injecting malicious codes into the vulnerable systems without acknowledge.

Note: To prevent all these potential consequences and save the computer, contact YooSecurity Online PC Experts to get help to remove this persistent Trojan:Win64/Sirefef.AL virus if you are not a PC expert yourself.

A Step-by-step Trojan Manual Removal Guide

Manual removal process is suggested here to get rid of this Trojan:Win64/Sirefef.AL infection since antivirus programs have mostly failed. Expertise will be required during the manual removal process to deal with changeable virus files. Steps have been listed in the following to get rid of this Trojan virus:

Step 1: Open Control Panel from Start menu. Go to Folder Options and under View tab, select Show hidden files and folders and non-select Hide protected operating system files (Recommended) then click OK.
Folder Options

Step 2: Open Windows Task Manager to end processed related to Trojan:Win64/Sirefef.AL virus. To do that, press Ctrl+Alt+Del keys at the same time or right click on bottom Task Bar and select Start Task Manager.
Windows Task Manager

Step 3: Go to Registry Editor. First press Windows+R keys and then type regedit in Run box to search. Delete registry entries associated with this Trojan infection:
Run+Registry Editor

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System “DisableRegedit”

Video on How to Modify or Change Windows Registry


Trojan:Win64/Sirefef.AL virus is specifically used by computer hackers to scam money from innocent PC users by all means. Since most antivirus applications cannot prevent such Trojan attacks, the risks are rather high. The most common experience PC users can get after this Trojan virus infection is that the computers will run extremely slow with constant stuck or freezing. When the situation gets worse, blue screens or auto shut down of the system can even be experienced every once in a while. In the meantime, many security alerts can keep popping up trying to convince you that the PC is severely infected and certain malware which pretends to be legit antivirus software will be prompted by these pop ups. If you install these unknown programs hoping to get rid of all these security alerts, you may end up being scammed by malware. And if the Trojan infection cannot be got rid of in time, online third parties can be allowed to access the infected computer remotely to collect valuable information and even take over control of the machine. You may not gain access back to the computer again once the infection gets worst. Hence, the sooner the virus removal is completed, the safer your computer will remain.

Note: Have spent hours on removal with no success? Contact YooSecurity Online PC Experts now to get further assistance if you can’t complete the manual removal process.

Published by Tony Shepherd & last updated on August 15, 2013 3:56 am

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