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Trojan:Win32/Bluteal.B!rfn. How to remove? (Uninstall guide)

removal by Alice Woods - - | Type: Trojans

Trojan:Win32/Bluteal.B!rfn – a false positive by Windows Defender, although users should not let their guard down

Trojan:Win32/Bluteal.B!rfn virus
Trojan:Win32/Bluteal.B!rfn may be a malicious software that can harm your computer and should be removed ASAP

Trojan:Win32/Bluteal.B!rfn might be a malicious application that infected your machine without you noticing, such as a trojan horse or a crypto miner[1] (this malicious software became quite popular among cybercriminals recently). Microsoft forums were flooded with questions, as users reported that Windows Defender is also detecting files of legitimate programs as malicious. Although Microsoft confirmed that it might be a false positive in some cases, it can also indicate a severe computer infection.

SUMMARY
Name Trojan:Win32/Bluteal.B!rfn
Type Trojan horse – can range from false positive to crypto-malware
Detection Use Reimage or Malwarebytes MalwarebytesCombo Cleaner to make sure the file is malicious
Symptoms If file is malicious, it can range from intense CPU/GPU usage, frequent error messages to increased amount of ads
Distribution Malicious files spread via contaminated spam email attachments, infected of hacked websites, file-sharing sites, etc.

False positives happen from time to time to every single AV engine, and it is due the code particular programs are written in. Users can report certain detections as false positives so that security researchers could investigate further. Additionally, users can also set the detected program as an exception, if they are entirely sure that it is not malware.

Nevertheless, we do not recommend doing that, especially if you are not that computer-savvy. In some cases, the detection might be real – Trojan:Win32/Bluteal.B!rfn removal would be required. If you are not sure if the detected file is actually malicious, you should scan your computer with Reimage, Malwarebytes MalwarebytesCombo Cleaner or other security software that could confirm that the file is indeed malicious.

Users also reported that even Windows files could be flagged as a BluTeal trojan, such as Microsoft.CertificateServices.PKIClient.Cmdlets.ni.dll or Microsoft.VisualStudio.Utilities.Internal.ni.dll. These reports started to occur at around May when it was added to Windows Defender. The description of the threat seems to be not quite definite:[2]

This threat can perform a number of actions of a malicious hacker's choice on your PC.

However, according to Microsoft's definition version 1.271.37.0, an update has been made to the Trojan:Win32/Bluteal.B!rfn, and possibly removed the change of it being a false positive. Nevertheless, there is no official confirmation that is has been fixed yet, and users might have to wait for the next Windows Defender update. Still, security experts[3] recommend to keep security software up to date – make sure the version of your security software is the latest one.

As of now, we advise you not to rush if your anti-virus detected a trojan. It might be a false positive, and it might be not. If the latter is true, you would have to remove Trojan:Win32/Bluteal.B!rfn virus from your machine carefully, especially if your computer is experiencing error messages, BSoDs, slowdowns, high CPU/GPU usage, increased amounts of ads, and similar behavior. 

Trojan:Win32/Bluteal.B!rfn malware
Trojan:Win32/Bluteal.B!rfn is either a severe virus (like crypto-miner) or a false positive if it is flagging legitimate files

Trojan horses can be avoided by being careful online

False positives may confuse users, as they might see a legitimate program being flagged as malicious. However, security experts recommend always to take a great interest if the AV engine flagged something. It can still be a virus which can significantly damage your computer or steal personal data. Therefore, it is vital to be careful online. Even though nothing can make you secure from viruses 100% but there is still something you can do to lessen the chance of infection:

  • install anti-malware software – that is the basic rule which can save you hundreds of dollars and your precious files;
  • back-up your data on a remote server or an external HDD;
  • avoid visiting websites of dubious content, such as free online gaming, adult, file-sharing, gambling, etc.;
  • do not download software or its updates from third-party sites;
  • do not click on the suspicious spam emails – phishing emails is the most prominent malware distribution method;
  • patch your operating system and software regularly;

Make sure you remove Trojan:Win32/Bluteal.B!rfn if it is malicious

Regardless if Trojan:Win32/Bluteal.B!rfn is a virus or not, we recommend users to investigate further, and opt to scan their machines using additional reputable security software – Reimage or Malwarebytes MalwarebytesCombo Cleaner. In some cases, malware can be hard to detect and not all anti-virus tools are capable of doing that.

If the file is indeed malicious, do not delay Trojan:Win32/Bluteal.B!rfn removal. Do not even try eliminating the cyber threat manually, as this action can only be performed successfully by IT experts. Trojans and similar infections have a complicated code which modifies system files, and it is hard to set everything back to normal without the anti-virus tool.

If you struggle to remove Trojan:Win32/Bluteal.B!rfn virus, you should reboot your Windows machine and enter Safe Mode with Networking, as explained below.

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What to do if failed?
If you failed to remove virus damage using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to remove virus damage. 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.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with Malwarebytes.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with Combo Cleaner.

To remove Trojan:Win32/Bluteal.B!rfn, follow these steps:

Remove Trojan:Win32/Bluteal.B!rfn using Safe Mode with Networking

To eliminate Trojan:Win32/Bluteal.B!rfn virus safely, you should enter Safe Mode with Networking:

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove Trojan:Win32/Bluteal.B!rfn

    Log in to your infected account and start the browser. Download Reimage or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete Trojan:Win32/Bluteal.B!rfn removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove Trojan:Win32/Bluteal.B!rfn using System Restore

You can attempt the virus extermination by using System Restore:

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of Trojan:Win32/Bluteal.B!rfn. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage and make sure that Trojan:Win32/Bluteal.B!rfn removal is performed successfully.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Trojan:Win32/Bluteal.B!rfn and other ransomwares, use a reputable anti-spyware, such as Reimage, Malwarebytes MalwarebytesCombo Cleaner or Plumbytes Anti-MalwareMalwarebytes Malwarebytes

About the author

Alice Woods
Alice Woods - Likes to teach users about virus prevention

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