How to uninstall Bifrose RATs from the operating system

Also Known As: Bifrose virus
Type: Trojan
Damage level: High

What is Bifrose?

Bifrose is a family of Remote Administration Tools (RATs). Cyber criminals seek to infect computers with programs of this type to take control over them and perform specific actions, which allow them to generate revenue.

Research shows that Bifrose's RATs can be used to manage files, processes, log keystrokes, take screenshots, access webcams, execute commands, edit the registry and steal passwords.

Bifrose malware

By controlling systems remotely, cyber criminals can open, edit, rename, move, delete, modify or even download files that might contain private, sensitive information. Process management features allow them to start and stop various processes.

Cyber criminals often terminate processes of running antivirus solutions, which would otherwise detect the presence of installed malware and stop it from running, or remove it from the operating system. Keylogging features allow cyber criminals to record keystrokes. I.e., to record each key pressed on the keyboard.

These features are commonly used to steal various credentials (passwords, logins), credit card details, and other sensitive information that victims type whilst accessing personal accounts or performing other private actions. Screen and webcam captures allow cyber criminals to take screenshots and make videos of the victim.

In this way, cyber criminals can take screenshots/record videos of confidential documents or other data, record the victim using the computer, etc. Captured photos and videos can be used to blackmail the victim or generate revenue in other ways. Furthermore, Bifrose RATs can be used to run/execute various commands remotely.

Cyber criminals often use this feature to download and execute malicious files designed to install rogue software (for example, ransomware, Trojans, cryptocurrency miners). Additionally, these RATs are capable of stealing various passwords. They are likely to target banking-related accounts, social media, email, and other accounts.

Typically, cyber criminals use stolen accounts to make fraudulent transactions and purchases, proliferate malware, trick other people into transferring money, steal identities, etc.

Threat Summary:
Name Bifrose virus
Threat Type Remote Access Trojan
Detection Names (file-3143845_exe) Avast (Win32:BackDoor-ZR [Trj]), BitDefender (Trojan.Generic.8021513), ESET-NOD32 (Win32/Bifrose.NTA), Kaspersky (Backdoor.Win32.Bifrose.fsi), Full List (VirusTotal)
Symptoms Trojans are designed to stealthily infiltrate the victim's computer and remain silent, and thus no particular symptoms are clearly visible on an infected machine.
Distribution methods Infected email attachments, malicious online advertisements, social engineering, software 'cracks'.
Damage Stolen passwords and banking information, identity theft, the victim's computer added to a botnet.
Malware Removal (Windows)

To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Combo Cleaner.
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In summary, RATs that belong to the Bifrose family are powerful remote administration tools that can be used to generate revenue in various ways. Users who have RATs installed on their computers are exposed at risk of becoming victims of identity theft, monetary, data loss, serious privacy issues, and other problems.

Therefore, if there is any reason to believe that Bifrose or other RATs are installed on the operating system, remove them immediately. Some examples of other software of this type includes Parallax, Dacls and Xtreme.

How did Bifrose infiltrate my computer?

Cyber criminals often proliferate malware and RATs through spam campaigns (emails), software 'cracking' tools, Trojans, untrusted software download channels and unofficial software updaters. They send emails that contain malicious attachments. When recipients open/execute them, they cause installation of malicious software (in this case, the RAT).

Some examples of attachments that cyber criminals attach to their emails are Microsoft Office documents, executable files (.exe), PDF documents, archive files such as ZIP, RAR and JavaScript files. Various third party activation ('cracking') tools often cause installation of high-risk malware.

People who use such tools to bypass activation of licensed software often cause installation of malicious software instead. Trojans are malicious programs that proliferate/install other programs of this kind, however, this can only happen when the computer is already infected with them.

Peer-to-peer networks (torrent clients, eMule), third party downloaders, installers, freeware download websites, free file hosting websites are channels that cyber criminals often use to host and distribute malicious files. By opening files dowloaded through them, users risk installing malicious software.

Fake software updaters cause damage by exploiting bugs/flaws of outdated software or by installing malicious software rather than updates/fixes.

How to avoid installation of malware

Software and files should not be downloaded or installed through third party downloaders, installers, Peer-to-Peer networks and other tools that are mentioned in the paragraph above. This be performed using only official, trustworthy websites and direct links.

Attachments and website links in irrelevant emails that are received from unknown, suspicious addresses should never be opened. Installed software must be updated through tools and functions that are provided by official software developers. Avoid third party updaters.

The same applies to activation of licensed software. Furthermore, it is illegal to activate software with unofficial 'cracking' tools. Regularly scan the operating system for threats with reputable antivirus or anti-spyware software.

If you believe that your computer is already infected, we recommend running a scan with Combo Cleaner Antivirus for Windows to automatically eliminate infiltrated malware.

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced IT skills. Combo Cleaner is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
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How to remove malware manually?

Manual malware removal is a complicated task - usually it is best to allow antivirus or anti-malware programs to do this automatically.

To remove this malware we recommend using Combo Cleaner Antivirus for Windows. If you wish to remove malware manually, the first step is to identify the name of the malware that you are trying to remove. Here is an example of a suspicious program running on a user's computer:

malicious process running on user's computer sample

If you checked the list of programs running on your computer, for example, using task manager, and identified a program that looks suspicious, you should continue with these steps:

manual malware removal step 1Download a program called Autoruns. This program shows auto-start applications, Registry, and file system locations:

screenshot of autoruns application

manual malware removal step 2Restart your computer into Safe Mode:

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button.

Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button.

In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":


manual malware removal step 3Extract the downloaded archive and run the Autoruns.exe file.

extract autoruns.zip and run autoruns.exe

manual malware removal step 4In the Autoruns application, click "Options" at the top and uncheck "Hide Empty Locations" and "Hide Windows Entries" options. After this procedure, click the "Refresh" icon.

Click 'Options' at the top and uncheck 'Hide Empty Locations' and 'Hide Windows Entries' options

manual malware removal step 5Check the list provided by the Autoruns application and locate the malware file that you want to eliminate.

You should write down its full path and name. Note that some malware hides process names under legitimate Windows process names. At this stage, it is very important to avoid removing system files. After you locate the suspicious program you wish to remove, right click your mouse over its name and choose "Delete".

locate the malware file you want to remove

After removing the malware through the Autoruns application (this ensures that the malware will not run automatically on the next system startup), you should search for the malware name on your computer. Be sure to enable hidden files and folders before proceeding. If you find the filename of the malware, be sure to remove it.

searching for malware file on your computer

Reboot your computer in normal mode. Following these steps should remove any malware from your computer. Note that manual threat removal requires advanced computer skills. If you do not have these skills, leave malware removal to antivirus and anti-malware programs.

These steps might not work with advanced malware infections. As always it is best to prevent infection than try to remove malware later. To keep your computer safe, install the latest operating system updates and use antivirus software.

To be sure your computer is free of malware infections, we recommend scanning it with Combo Cleaner Antivirus for Windows.

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About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

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Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

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