Need Help Removing Trojan:Win32/Sirefef.AG? Get Rid of The Virus Completely

How do you remove Trojan:Win32/Sirefef.AG virus if your antivirus didn’t help? 

Trojan:Win32/Sirefef.AG is a nasty Trojan infection, which is detected by the Microsoft antispyware engine or we call Microsoft Security Essentials. This kind of virus is very tricky, it keeps coming back again and again even if the antivirus claimed after a reboot it will be gone. It is annoying the same as Trojan:Win32/Sirefef.AH. And this is a stubborn virus that always comes with Win32/Sirefef.AH and  Win32/Sirefef.AC. By loading itself into memory separately from the host program, the virus can continue to run in your system’s memory even after the host program is closed down. You could image this is urgent case. Through we stuied, some infected computers are home computers that have been used by many people, then the computers have issues always. And that is why Trojan:Win32/Sirefef.AG can easily attack people’s computers.They are running Microsoft Security Essentials and MWB, and have tried cleaning the computer and running MWB but these two keep popping back up.What is worse, you will be redirected when you open IE and have not been able to open Firefox at all. The virus can generate google redirect virus and rootkit infection. After it is loaded, the virus can then infect any other disk used by the computer, including the PC’s hard disk. You can try the guide below to completely remove the terrible virus, if antivirus program couldn’t fix this, you can get help from PC experts who can assist you to combat the threats or try the solution below.

Step #1: To completely remove Trojan:Win32/Sirefef.AG from XP, Vista or windows 7, You Need to Disable Your Network Connections

Note: This meets needs of users who are running a Microsoft® Windows® Operating System (with multiple network connections).

1-1. To clean Trojan:Win32/Sirefef.AG virus, Please click Start button on Windows Taskbar; then enter Control Panel section:

1-2. On the Control Panel window, please choose Network and Internet Connections option:

1-3. After clicked the Network and Internet Connections, please open up or pick a Control Panel icon sub-box, Next choose Network Connections option:

1-4. Check if the network was blocked by Trojan:Win32/Sirefef.AG Virus, If you are using Wireless Network Connections or the TCP/IP model (Transmission Control Protocol/Internet Protocol), please right click on that Wireless Network Connection icon or the local area network (LAN), scroll down your mouse and choose Properties, now you may see as following:

1-5. When the Wireless Network Connections Properties window was opened up, Please clcik on the Wireless Networks tab on the top of that window:

1-6. Now click on Advanced button at the bottom of Wireless Networks interface:

1-7-1. You will see the following items on the process of Trojan:Win32/Sirefef.AG removal guide:

  • Any available network (access point preferred)
  • Access point (infrastructure) networks only
  • Computer-to-computer (ad hoc) networks only

1-7-2. Please tick the second one, “Access point (infrastructure) networks only“, then shut down Advanced window by pressing down Close button; and then quit Wireless Network Connections Properties box by clicking on OK button.

1-8. Similar ways to disable Wireless Network Connections, you need to right click on local area network (LAN) icon, next choose and run Disable prompt command on your right menu to get rid of Trojan:Win32/Sirefef.AG:

For Microsoft® Windows® Vista/7 users to eliminate the virus:

For Microsoft® Windows® XP Service Pack 3 (SP3) users to delete the virus:

Here, your Network Connections should have been all disabled. Please manually delete the assocaited files of the Trojan:Win32/Sirefef.AG virus.

C:\WINDOWS\system32\’Trojan:Win32/Sirefef.AG’
C:\WINDOWS\Temp\setup.exe
C:\WINDOWS\system32\svchost -k svchost.exe
C:\WINDOWS\System32\ping.exe
%appdata% Ping.exe
Startup/random.link

Step #2: In order to thoroughly get rid of Trojan:Win32/Sirefef.AG Virus/ Ransomware, You Will Need to Re-enable Your Anti-Virus Software in Windows Safe Mode with Networking, here you can get one downloaded and installed in your system as Administrator to cleanthe rogueware.

Download Trojan:Win32/Sirefef.AG Removal Tool
If you failed to remove Trojan:Win32/Sirefef.AG with the tool above, please consult YooCare certified professionals to remove it completely. Live chat with professionals now

When you are in safe mode with networking, please run this services.msc command via pressing Windows Logo key + R key to open up Windows Services, locate your antivirus protection, right click on it, choose Properties, you’ll see Startup type, scroll down that menu to run Automatic type, then click OK button; go on and click Recovery tab and then set the three items to be Restart the service options.

Step #3: To Remove the rogue antispyware, You Need to Do Some Registry Editing Work

3-1. Open up My Computer icon on your desktop, then visit and enter Tools menu on top of it, then the Folder Options:

3-2. Then please click View tab, tick Show hidden files and folders item and untick Hide protected operating system files (Recommended) item:

3-3. Please examine these Registry entries, you will need to reset them to the default values as [blockquote shade="yes"]“%1″ %*:

  • HKEY_CLASSES_ROOTexefileshellopencommand
  • HKEY_CLASSES_ROOTcomfileshellopencommand
  • HKEY_CLASSES_ROOTbatfileshellopencommand
  • HKEY_CLASSES_ROOTpiffileshellopencommand
  • HKEY_CLASSES_ROOThtafileshellopencommand
  • HKEY_CLASSES_ROOThtfileshellopencommand

video guide on how to reset Windows Registry entried changed by Trojan:Win32/Sirefef.AG:


Note: please search out the whole Registry to find out, then delete regedit.com value created by this scareware! One more malicious value to be removed off:

And for more computer newbies, please download and run Registry repair tool in my Trojan:Win32/Sirefef.AG Virus removal Reference section.
Update your Antivirus software, apply a full virus scanner in Windows Safe Mode to fix Windows Bug, to then try to fix other Internet Explorer errors.

Trojan:Win32/Sirefef.AG Virus can be used to execute malicious code. And it can make chaos in your computer.  Obviously, you want to avoid any behavior that could infect your computer with a virus. Unfortunately, viruses are spread by contact with other computers, or data copied from other computers. So whenever you share data with another computer or computer user, you risk exposing your computer to potential viruses.

Based on various situations and computer skills, you can choose the following solutions fit for you.
1. Follow the steps we provide to mannually remove the virus.
2. Download Trojan:Win32/Sirefef.AG Removal Tool
3. If you failed to remove Trojan:Win32/Sirefef.AG with the tool above, please consult YooCare certified professionals to remove it completely. Live chat with professionals now

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