Win32/Bluteal.B!rfn Trojan

Also Known As: Win32/Bluteal.B!rfn virus
Type: Trojan
Distribution: Moderate
Damage level: Medium

Win32/Bluteal.B!rfn virus removal guide

What is Win32/Bluteal.B!rfn?

Recently, thousands of users have encountered a pop-up stating that the system is infected with the Win32/Bluteal.B!rfn trojan. The pop-up is displayed by Microsoft Windows Defender, however, this anti-malware tool detects completely legitimate files and identifies them as Win32/Bluteal.B!rfn trojans. This is frustrating and dangerous, since false-positive detections can lead to permanent data loss.

Win32/Bluteal.B!rfn malware

False-positive detections typically occur due to anti-malware suite database flaws - the database contains false information and, therefore, the anti-virus tool detects irrelevant files. Initially, these "flaws" may seem insignificant, however, the tools can permanently delete false-positives. Furthermore, this behavior might be concerning, since users continually encounter interrupting pop-ups. Resolving this issue is simple - developers must simply update the database and redefine the Win32/Bluteal.B!rfn entry. Remember that Win32/Bluteal.B!rfn malware exists. Currently there are many users of Windows Defender with outdated databases. Therefore, they will encounter these false-positives. If Windows Defender has detected the Win32/Bluteal.B!rfn trojan on your system, we strongly advise you to firstly update the tool (especially if you are certain that the detected file is legitimate) before taking any further action. To update Windows Defender, follow these steps below.

Threat Summary:
NameWin32/Bluteal.B!rfn virus
Threat TypeTrojan, Password stealing virus, Banking malware, Spyware
SymptomsTrojans are designed to stealthily infiltrate victim's computer and remain silent thus no particular symptoms are clearly visible on an infected machine.
Distribution methodsInfected email attachments, malicious online advertisements, social engineering, software cracks.
DamageStolen banking information, passwords, identity theft, 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 Malwarebytes.
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The Internet is full of trojans, most of which are extremely dangerous. The list of examples includes (but it is not limited to) TrickBot, Emotet, FormBook, and Adwind. Most of these viruses are developed to gather sensitive information (which is later misused to generate revenue [via online money transfers, identity theft, and so on]) and promote other viruses (typically ransomware). These viruses present a strong case to actively protect your privacy and computer safety. Trojans are commonly proliferated using various spam campaigns, such as Monthly Invoice, You Have A Santander Secure Email, and others.

How did Win32/Bluteal.B!rfn install on my computer?

As mentioned above, trojans are typically distributed using spam emails campaigns. Developers send thousands of emails with malicious attachments (typically, MS Office documents). Once opened, these files execute scripts that stealthily download and install malware. Note that malicious MS Office attachments are only capable of downloading malware when opened using the Office program. If documents are opened with other apps (capable of reading that format), the malware will not be downloaded. Trojans might also be distributed using fake update tools and a deceptive marketing method called "bundling". Fake updaters infect the system by exploiting outdated software bugs/flaws or simply downloading and installing malware rather than updates. "Bundling" is stealth installation of rogue software together with regular software. Developers hide "bundled" apps within "Custom/Advanced" settings (or other sections) of the download/installation processes. By rushing these procedures and skipping steps, users often expose their systems to risk of various infections.

How to avoid installation of malware?

The main reasons for computer infections are poor knowledge and careless behavior. Therefore, pay close attention when browsing the Internet and downloading/installing software. You are advised to think twice before opening email attachments. Files that seem irrelevant or been received from suspicious email addresses should not be opened. Note that newer versions (2010 and above) of MS Office open newly-downloaded documents in "Protected View" mode. This prevents malware installation. Older versions do not have this feature and using them is risky. We also strongly recommend that you keep installed applications up-to-date. To achieve this use only implemented functions or tools provided by the official developer. Furthermore, carefully analyze each download/installation step and opt-out additionally-included programs. Software should be downloaded from official sources only (using direct download links), rather than using third party downloaders/installers. These tools are monetized using the "bundling" method and should not be used. Have a reputable anti-virus/anti-spyware suite installed and running. The key to computer safety is caution. If you have been presented with a Win32/Bluteal.B!rfn detection, we recommend running a scan with Malwarebytes for Windows to automatically eliminate infiltrated malware.

To update Windows Defender, follow these steps:

Settings -> Update & Security -> Windows Update -> Check For Updates.

This should prevent further false-positive detections.

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Malwarebytes is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
▼ DOWNLOAD Malwarebytes By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Malwarebytes. 14 days free trial available.

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How to remove malware manually?

Manual malware removal is a complicated task and usually best performed by antivirus or anti-malware programs automatically. To remove this malware, we recommend using Malwarebytes 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 1 Download 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 the "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 want 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 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 file of the malware, 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. Unless you have these skills, leave malware removal to antivirus and anti-malware programs. These steps might not work with advanced malware infections, however, it is better to prevent your system becoming infected than attempt to remove malware after infection. 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 Malwarebytes for Windows.

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.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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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.

QR Code
Win32/Bluteal.B!rfn virus QR code
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