Apr 24, 2016

How to Remove Trojan:Win32/Sirefef.P Virus Completely?

I scanned with Microsoft Security Scanner and it found Trojan:Win32/Sirefef.P but when I tried to ‘clean’ the system it seemed to fail. It keeps saying “partially removed”. I also tried getting rid of the virus via AVG and Malwarebytes Anti-Malware but the virus seemed to still remain on my system. I don’t have my windows CD so re-installing the OS is out of the question. Any ideas? Is there any way I can get rid of this virus without losing my pictures and documents?

What’s Trojan:Win32/Sirefef.P virus? Is it dangerous?

Trojan:Win32/Sirefef.P is a malicious Trojan virus that usually installs on vulnerable computers with the use of security exploits and it has become one of the most serious threats to computer security. This virus is specifically designed by cyber criminals to download additional threats and steal account information, passwords, online banking data and credit card information from the target users. Users usually get it downloaded from corrupted websites or by visiting pornographic websites and opening attachments from spam emails. Once downloaded, it will keep popping up security alert saying that your PC is at risk. However, if you click the “Remove” option to delete the virus, it can’t do anything. Your antivirus program may show you an error to stop the removal or the virus just comes back again and again after every reboot. The virus is able to attack Windows based computer including Windows XP, Windows Vista, Windows 7, Windows 8 and even Windows 10, and it resides deeply in your system in order to perform different tasks to destroy your PC. You should get rid of it as soon as it is found.

Trojan:Win32/Sirefef.P virus can bring you serious computer damages and even data loss. It launches automatically at startup and may modify your system settings, registry settings, browser settings or even disable your Windows Task Manager and other normal program functions. Once the changes are made, you may notice the CPU occupancy rate is very high even though you only open few programs in the background. That is because the virus drops infected files and registry entries to consume a large amount of CPU and RAM. In addition, the virus can bring adware or browser hijacker to the system that may display unwanted pop-up ads and redirect web browser to shady website which are not trusted and may lead you to pay money wrongly for worthless products. Other than that, you will notice that your homepage or default search engine has been changed to a page that you have never seen before. You may also experience other unwanted problems like blue screen of death, Internet disconnection or system crash. Trojan virus is able to open a doorway on infected computer to allow remote attacker accessing and gathering your essential data like credit card details, login number, bank information etc. You are recommended to remove Trojan:Win32/Sirefef.P immediately.

The following instructions require certain levels of computer skills. If you’re not sure how to delete this nasty Trojan, please live chat with YooCare experts now.

Dangerous Actions Performed by This Virus:

1. It can compromise your system and may introduce additional infections like rogue software.
2. It forces you to visit websites and advertisements which are not trusted and may lead you to pay money wrongly for worthless products.
3. It takes up high resources and strikingly slows down your computer speed and even causes your computer stuck frequently.
4. It may allow cyber criminals to track your computer and steal your personal information.

How Does This Virus Get On Your Computer?

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 pop-ups or malicious links.
Open unknown email or download media files that contain the activation code of the virus.

About Trojan Virus Removal:

Currently many computer users had the same experience that this virus couldn’t be removed by any anti-virus applications. So the manual approach is always required to combat this virus. And here is the step-by-step removal guide for all computer users.

1. End the malicious process from Task Manager.

Once Trojan:Win32/Sirefef.P virus is installed, computer user may notice that CPU usage randomly jumps to 100 percent. At any time Windows always has many running processes. A process is an individual task that the computer runs. In general, the more processes, the more work the computer has to do and the slower it will run. If your system’s CPU spike is constant and remain at a constant 90-95%, users should check from Task Manager and see if there is a suspicious process occupying system resources and then end it immediately.

(The name of the virus process can be random.)

Press Ctrl+Shift+Esc to quickly bring up Task Manager Window:

task manager

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.

Folder Options

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 Windows key + R to open Run box. In the “Open” field, type “regedit” and click the “OK” button.


Then a Registry Editor window will pop up as the following picture shows:

registry editor

b. Search malicious files and registry entries and then remove all of them:

%AllUsersProfile%\Application Data\.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\[random]
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Temp

Video Shows You How to Safely Modify Windows Registry Editor:

Trojan:Win32/Sirefef.P virus infiltrates into the compromised PC system without a user’s knowledge and it poses high risks to the privacy and security. Users are typically tricked by some form of social engineering into loading and executing this Trojan on their systems. Once activated, this virus can enable cyber-criminals to spy on you, steal your sensitive data, and gain backdoor access to your system. It gives your computer fatal damages. Your firewall will be turned off or disabled immediately. Whenever you are online, you may find that your homepage and default search provider have been changed without your permission. The virus also consumes a great part of CPU resource which can make the affected machines run slowly. What’s worse, black screen and BSOD problem may occur often on the corrupted machines that can lead to hardware damage issue. This type of Trojan is designed to steal your account data for online banking systems, e-payment systems, and credit or debit cards. To save your computer and protect your privacy, Trojan:Win32/Sirefef.P virus must be removed manually as quickly as possible.

Note: If you are not knowledgeable enough to be able to distinguish the location of this virus, or you are afraid of making mistake during the manual removal, please contact experts from Yoocare Online Tech Support for further help.

Published by & last updated on April 24, 2016 3:05 am

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