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Sirefef. How to remove? (Uninstall guide)

removal by Gabriel E. Hall - -   Also known as Trojan.Sirefef | Type: Trojans

What is Sirefef?

Sirefef is a Trojan family that includes different types of parasites that all are capable of initiating different things. Every version of Sirefef viruses has it’s own task. For example: one component is set to open the backdoors of the system, another one – block the firewall and other security software, the next one can be used for downloading malicious files and updates from the internet, and so on. Besides, this trojan horse can easily hide deep inside the system and try other methods for preventing its elimination from it. In addition, some other versions of these threats can try to redirect web traffic to associated websites and try to generate pay-per-click revenue in this way. So, annoying pop up ads may be one of the signs telling you that your PC is affected by Sirefef trojan horse.

When inside the system, Sirefef trojan horse can be used for various malicious tasks. However, the most important among them is its ability to steal personal people’s information, such as passwords, logins, financial information and so on. As soon as it is revealed, this data is sent to a remote server, which belongs to cybercriminals. Besides, Sirefef can be used for causing system modifications, like changing registry settings and other important settings. This may lead you to system crash and problems when trying to browse the internet. Please,do NOT let Sirefef stay on your computer! If you have even the smallest doubt about its infiltration on your computer, you should run a full system scan with updated anti-spyware, like Reimage, and remove this virus.

How can Sirefef infect my computer?

In most of the cases, such trojans as Sirefef can be downloaded to computer after clicking on misleading search results that are sponsored by hackers. In most of the cases, such results are displayed thru suspicious search engines. However, security experts have also revealed that Yahoo or Bing have also displayed them. Please, be really careful when searching for adobe flash player and similar programs because search results related to this program may be corrupted. They may look innocent, but this is only an image. No matter how peaceful the landing page looks like, it may have nothing in common with Adobe.

How to get rid of Sirefef virus?

Sirefef is a very malicious cyber threat. It’s important to remove it from your computer, because it may not only use it and your Internet resources for illegal purposes. It can also try to delete your valuable files, steal your sensitive information and so on. Additionally, it may open a remote control connection to your PC and let additional threats inside your computer. When trying to remove Sirefef from the system, it may kill your anti-spyware and its processes. Fortunately, the developers of SpyHunter and some other reputable anti-spyware tools have found the way to delete Sirefef trojan from PC systems. That’s why we highly advise you to use Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus or Malwarebytes Anti Malware for its removal.

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Compatible with Microsoft Windows Compatible with OS X
What to do if failed?
If you failed to remove infection using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to uninstall Sirefef. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.

Note: Manual assistance required means that one or all of removers were unable to remove parasite without some manual intervention, please read manual removal instructions below.

More information about this program can be found in Reimage review.
Press mentions on Reimage
Sirefef snapshot

Sirefef manual removal:

Kill processes:

Unregister DLLs:


Delete files:





About the author

Gabriel E. Hall
Gabriel E. Hall - Passionate web researcher

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  • Richard

    i cant access the internet, probably because of the virus. Can i download spyhunter in safe mode

  • Mike in IT

    Malwarebytes didnt even detect it. We have Forefront and it gets detected, but after removal it just comes right back in only a couple of minutes.

  • ash

    malwarebytes did not find it at found trojans and some other thingy…i went to and downloaded thier free one and it found sirefef and got rid of it in no time.