Backdoor:Win32/Kelihos!rfn

This post is all about the hazardous Backdoor:Win32/Kelihos!rfn virus. Also part of this page are Removal Guide, suggested Virus Scanner, and ways to Protect the Computer.

What is Backdoor:Win32/Kelihos!rfn?

Illustration for Backdoor:Win32/Kelihos!rfn

Backdoor:Win32/Kelihos!rfn is a detection for computer virus that has backdoor abilities. Once it infects the computer, remote attacker can gain unauthorized entry and take control of the infected device. This can further compromise the computer because the hacker can do different malevolent actions such as downloading and execution of additional threats. Therefore, if anti-virus application pop-ups a warning about the presence of Backdoor:Win32/Kelihos!rfn, better run a thorough scan to delete it and thwart any further contamination.

Threat Behavior

There is no definite answer on how Backdoor:Win32/Kelihos!rfn was able to infect the computer. This may vary from one victim to another. One thing is for sure, the developers of this virus are exploiting the internet connection as the primary way to spread the infection. Backdoor:Win32/Kelihos!rfn is often found as embedded to spam emails, cracked applications, malicious advertisements, fake software update, and so on. Computer users may likewise acquire the virus from visiting malicious websites and download files from the said source.

The moment that Backdoor:Win32/Kelihos!rfn is run on the computer. It can append executable files to run the virus each time that user opens the infected program. The auto-start technique of this virus rely heavily on the entry that it added to the Windows registry. Thus, Backdoor:Win32/Kelihos!rfn runs alongside Windows boot-up and it remains memory resident, which makes it difficult for security applications to detect or remove the virus.

Payload

Backdoor:Win32/Kelihos!rfn was made to infect the computer and allows a remote attacker to execute different malicious actions. Once the virus is operational on the computer, it can do any of the following tasks:

  • Establish a communication to a remote server.
  • Collect sensitive information from the computer.
  • Submit gathered data to the specified server.
  • Open a backdoor port on the infected computer.
  • Allows a remote attacker to control the computer.
  • Download and execute additional virus.

Aliases

BKDR_KELIHOS.SMO (TrendMicro), Mal/Kelihos-B (Sophos), Backdoor.Win32.Hlux.csl (Kaspersky), Trojan.Win32.Kelihos.acd (Sunbelt), Trojan horse Inject2.BITZ (AVG)

Versions of Backdoor:Win32/Kelihos!rfn
Version NameAlert LevelDate Added
Backdoor:Win32/KelihosSevereFeb 01, 2011
Backdoor:Win32/Kelihos.ACSevereAug 26, 2012
Backdoor:Win32/Kelihos.gen!ASevereFeb 06, 2015
Backdoor:Win32/Kelihos.A!plockSevereMay 11, 2015
Backdoor:Win32/Kelihos.B!bitSevereMay 28, 2019
For complete details including full list of Backdoor:Win32/Kelihos!rfn variants, please refer to this Microsoft Security Intelligence page


How to remove Backdoor:Win32/Kelihos!rfn?

To totally remove Backdoor:Win32/Kelihos!rfn from the computer and get rid of relevant virus and trojan, please execute the procedures as stated on this page. Make sure that you have completely scan the system with suggested malware removal tools and virus scanners.

Remove Backdoor:Win32/Kelihos!rfn Instantly

To instantly remove Backdoor:Win32/Kelihos!rfn, we suggest that you scan the infected computer with this powerful virus removal tool. It can detect and get rid of Trojans, viruses, malware, and adware from the infected computer. To fully protect the computer against Backdoor:Win32/Kelihos!rfn or similar attack, you can activate Sophos to have real-time scanning and complete defense against all forms of threats.

1. Download Sophos Virus Removal Tool from the link below. Save the file on your computer where you can easily access it.

2. Once the download completes, browse the location of the file. Double-click to run the program and begin the install process.

Screnshot of Sophos Installer

3. On first windows of installation wizard, click Next to continue. Then, it will display the program’s License Agreement. You need to Accept the terms in order to proceed. If Windows prompts for User Account Control, please click Yes to proceed.

Screenshot of Sophos EULA Page

4. On succeeding windows, click Next or Continue to carry on with the installation. After completing the installation process, Launch Sophos Virus Removal Tool.

5. Internet connection is required when running this scanner in order to download important updates. Make sure that everything is up-to-date to effectively remove virus like Backdoor:Win32/Kelihos!rfn.

6. Click the  button to  carry out the Scan. This will check the system for presence of malicious objects, malware, and viruses. The tool reveals items that were found linked to Backdoor:Win32/Kelihos!rfn and other suspicious entities. Be sure to remove all identified threats.

Screenshot of Sophos Virus Scan

After executing the above instructions, Backdoor:Win32/Kelihos!rfn should have been eliminated totally from the computer. If there are still signs of infection or computer is displaying unusual behaviors, please continue with the remaining procedures.

Stage 1 : Start Windows in Safe Mode With Networking

Windows 10 Guide

1. Click on Windows logo and select Power icon when options pop-ups.
2. Select Restart from the options while pressing Shift key on the keyboard.
3. Choose an Option window will appear, select the Troubleshoot button.
4. On next window, please choose Advanced Option.
5. On Advanced Option window, click on Startup Settings and then, click Restart button to reboot the computer.
6. When Windows boot on Startup Settings, press function key F5 or number 5 on keyboard.

A simpler alternative for Windows 10 users is to scan the computer with Microsoft Defender Offline. This will run a virus scan in the recovery environment.

Windows 8 Guide

1. Click Windows Start icon at the lower left section of the screen.
2. Open Search window and type Advanced in the field. It will open General PC Settings.
3. Click on Advanced Startup and then, click on Restart Now button.
4. Once the computer starts in Advanced Startup option menu, select Troubleshoot.
5. Next, click on Advanced Options to reveal the next section.
6. Click Startup settings and then, click Restart button to boot the PC in Startup Settings.
7. Use function key F5 or number key 5 to Enable Safe Mode with Networking.

Stage 2 :Double Check with Microsoft Security Apps

Microsoft Windows has built-in security application that you can use to double-check if computer is still infected with Backdoor:Win32/Kelihos!rfn. For Windows 8 and 10 users, please run Windows Defender. Users of Windows Vista and older versions can utilize Microsoft Security Essentials to remove Backdoor:Win32/Kelihos!rfn virus.

Windows 8 / 10 Instructions:

Windows Defender is a free tool that was built help you remove Backdoor:Win32/Kelihos!rfn, viruses, and other malicious items from Windows 8 or Windows 10 system. Follow these procedures to scan your computer with Windows Defender:

1. Tap or click the Search charm, search for defender, and then open Windows Defender.

If Windows Defender is not yet installed on the computer, please proceed to download page using the link below. It also contains detailed instruction to install and use the program effectively. Proper usage is required to totally remove Backdoor:Win32/Kelihos!rfn

WD-charm

2. On the Home tab, click Full under Scan Options. Click Scan now to start scanning for presence of Backdoor:Win32/Kelihos!rfn. The process may take a while to complete.

WD-fullscan

3. After the scan, delete/quarantine identified threats wether it is relevant to Backdoor:Win32/Kelihos!rfn or not. You may now restart Windows to complete the virus removal process.

Windows XP, Windows Vista, and Windows 7 Instructions:

1. Open Microsoft Security Essentials by going to Windows Start > All Programs. If the tool is not yet installed on the computer, please download Microsoft Security Essentials from the link below. Save the file on your hard drive.

Complete installation guide and usage are also provided on the same link. It is essential in removing Backdoor:Win32/Kelihos!rfn effectively. If Microsoft Security Essentials is already installed on the PC, please proceed with the steps below.

2. On Microsoft Security Essentials Home screen, please choose Full under Scan Options.

MSE Full Scan

3. Click on Scan Now button to start detecting Backdoor:Win32/Kelihos!rfn items, viruses, and malware on the PC. Scan may take a while, please be patient and wait for the process to end.

How to protect the computer?

The initial defense that comes to the mind of any computer users is to install an anti-virus or anti-malware program. This move is sensible and probably the most practical way to protect the computer against Backdoor:Win32/Kelihos!rfn attack. Hence, keep in mind that having a security software do not give full guarantee of protection. The most part of the prevention still lies on being cautious of users and therefore we are providing the following information as guidelines to protect the computer from virus infection.

Avoid Malicious Websites

There are enormous numbers of websites that was made for the primary purpose of spreading Backdoor:Win32/Kelihos!rfn. Normally, these sites are involved in integrating malicious pop-up and browser hijacker, that will eventually cause further virus infection. Avoid such kind of websites.

Delete Phishing Emails

The mass-mailing of computer viruses gives the attackers the luxury of spreading their malicious code in just one send off. This will arrive in the inbox as email that appears to be from a legitimate organization. So, if you receive an unexpected email with a link or an attached file, better delete it immediately.

Do Not Click a Suspicious Link

Links from social media, forums, and blog sites are sometimes being utilized by attackers to drive web users to a malicious page that contains malicious code. Therefore, do not just click on any link especially if it looks suspicious. Accidental access to the destination site may lead to Backdoor:Win32/Kelihos!rfn infection.

Be Careful When Downloading Files

Cracked software, serial key generators, and several freeware are seen as another method that spreads the Backdoor:Win32/Kelihos!rfn virus. Avoid acquiring these types of application and if there is a need to download a freeware or shareware, be sure to obtain it from the official website or trusted providers.

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