Backdoor:Win32/Bisonal!MSR Backdoor Virus (Bisonal Removal)

Written by Wilbur Woodham

The Backdoor:Win32/Bisonal!MSR notification means that your system has a problem. Allowing it to keep running may end up with some really bad consequences. Bisonal grants the crooks access to your system, or even connects it to the botnet.

Backdoors like Bisonal are flexible threats that can act as self-sufficient malware, or be used in multi-stage attacks. Their key purpose is to create a remote connection to the system, that operates without the user’s knowledge. To avoid any interruptions, malware tries to stay as low as possible.

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When we talk about the intrusion of unfamiliar programs into your computer’s work, the proverb “Forewarned is forearmed” describes the situation as accurately as possible. Gridinsoft Anti-Malware is exactly the tool that is always useful to have in your armory: fast, efficient, up-to-date. It is appropriate to use it as an emergency help at the slightest suspicion of infection.
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Backdoor:Win32/Bisonal!MSR Detection Overview

The Backdoor:Win32/Bisonal!MSR detection you can see in the lower right side is shown to you by Microsoft Defender. That anti-malware application is quite OK at scanning, but prone to be basically unreliable. It is vulnerable to malware invasions, it has a glitchy user interface and problematic malware removal features. Hence, the pop-up which says concerning the Bisonal is simply an alert that Defender has spotted it. To remove it, you will likely need to make use of a separate anti-malware program.

Backdoor:Win32/Bisonal!MSR found

Microsoft Defender: “Backdoor:Win32/Bisonal!MSR”

The exact Backdoor:Win32/Bisonal!MSR virus is a very nasty thing. This malware is developed to be a sneaky intruder, which functions as a remote-access tool. When you provide someone else remote access willingly, it is OK, however, Bisonal will not ask you if you wish to provide it. After connecting to your system, criminals are able to do whatever they want – snatching your files, browsing your messages, gathering personal information, and so on. Backdoors usually carry an additional stealer – the virus that is developed to gather all possible data about you. However, a lot more common use of the backdoors is establishing the botnet. Then, the network of attacked systems can be put to use to perform DDoS attacks or to inflate the vote results on various sites.

Backdoor Summary:

NameBisonal Backdoor
DamageGain access to the operating system to perform various malicious actions.
SimilarVirtool Impacket, Agent Racoon Malware, Trojandownloader Swf Esaprof, Hacktool Impacketexec, Trojan Cobaltstrike, Worm Alcan, Msil Quasar, Cur Malware
Fix ToolSee If Your System Has Been Affected by Bisonal backdoor

Shortly about backdoors

Backdoors are viruses that can obtain both separated and built-in shapes. One time you can find that a legitimate program from a reputable company has a capability that enables someone to connect to your computer. Will it be someone from the developers or a 3rd party – nobody knows. But the scandal when this feature is spotted in a legitimate program is nearly impossible to miss. There is also gossip that there is a hardware-based backdoor in Intel CPUs1.

Is Backdoor:Win32/Bisonal!MSR dangerous?

As I have actually stated , non-harmful malware does not exist. And Backdoor:Win32/Bisonal!MSR is not an exclusion. This backdoor does not deal a many damage just after it introduces. However, it will likely be a really unpleasant surprise when an occasional forum or website in the Web will not let you in, because your IP-address is disallowed after the DDoS attack. However, even if it is not important for you – is it enjoyable in any way to realise that someone else can easily access your PC, read your conversations, open your files, and spectate what you do?

The spyware that is commonly present as a supplement to the Backdoor:Win32/Bisonal!MSR malware will likely be just one more argument to remove it as fast as you can. Nowadays, when users’ information is valued very high, it is too silly to provide the burglars such a possibility. Even worse if the spyware will somehow manage to take your banking information. Seeing zeros on your bank account is the most awful problem, in my opinion.

Remove Bisonal with Gridinsoft Anti-Malware

We have also been using this software on our systems ever since, and it has always been successful in detecting viruses. It has blocked the most common Backdoors as shown from our tests with the software, and we assure you that it can remove Bisonal as well as other malware hiding on your computer.

Gridinsoft Anti-Malware - Main Screen

To use Gridinsoft for remove malicious threats, follow the steps below:

1. Begin by downloading Gridinsoft Anti-Malware, accessible via the blue button below or directly from the official website

2.Once the Gridinsoft setup file (setup-gridinsoft-fix.exe) is downloaded, execute it by clicking on the file.


3.Follow the installation setup wizard's instructions diligently.

Gridinsoft Setup Wizard

4. Access the "Scan Tab" on the application's start screen and launch a comprehensive "Full Scan" to examine your entire computer. This inclusive scan encompasses the memory, startup items, the registry, services, drivers, and all files, ensuring that it detects malware hidden in all possible locations.

Scan for Bisonal Backdoors

Be patient, as the scan duration depends on the number of files and your computer's hardware capabilities. Use this time to relax or attend to other tasks.

5. Upon completion, Anti-Malware will present a detailed report containing all the detected malicious items and threats on your PC.

The Bisonal was Found

6. Select all the identified items from the report and confidently click the "Clean Now" button. This action will safely remove the malicious files from your computer, transferring them to the secure quarantine zone of the anti-malware program to prevent any further harmful actions.

The Bisonal has been removed

8. If prompted, restart your computer to finalize the full system scan procedure. This step is crucial to ensure thorough removal of any remaining threats. After the restart, Gridinsoft Anti-Malware will open and display a message confirming the completion of the scan.

Remember Gridinsoft offers a 6-day free trial. This means you can take advantage of the trial period at no cost to experience the full benefits of the software and prevent any future malware infections on your system. Embrace this opportunity to fortify your computer's security without any financial commitment.

Trojan Killer for “Bisonal” removal on locked PC

In situations where it becomes impossible to download antivirus applications directly onto the infected computer due to malware blocking access to websites, an alternative solution is to utilize the Trojan Killer application.

Trojan Killer - Main View

There is a really little number of security tools that are able to be set up on the USB drives, and antiviruses that can do so in most cases require to obtain quite an expensive license. For this instance, I can recommend you to use another solution of GridinSoft - Trojan Killer Portable. It has a 14-days cost-free trial mode that offers the entire features of the paid version. This term will definitely be 100% enough to wipe malware out.

Trojan Killer is a valuable tool in your cybersecurity arsenal, helping you to effectively remove malware from infected computers. Now, we will walk you through the process of using Trojan Killer from a USB flash drive to scan and remove malware on an infected PC. Remember, always obtain permission to scan and remove malware from a computer that you do not own.

Step 1: Download & Install Trojan Killer on a Clean Computer:

1. Go to the official GridinSoft website ( and download Trojan Killer to a computer that is not infected.

Download Trojan Killer

2. Insert a USB flash drive into this computer.

3. Install Trojan Killer to the "removable drive" following the on-screen instructions.

Install Trojan Killer to Removable Drive

4. Once the installation is complete, launch Trojan Killer.

Step 2: Update Signature Databases:

5. After launching Trojan Killer, ensure that your computer is connected to the Internet.

6. Click "Update" icon to download the latest signature databases, which will ensure the tool can detect the most recent threats.

Click Update Button

Step 3: Scan the Infected PC:

7. Safely eject the USB flash drive from the clean computer.

8. Boot the infected computer to the Safe Mode.

9. Insert the USB flash drive.

10. Run tk.exe

11. Once the program is open, click on "Full Scan" to begin the malware scanning process.

Searching Bisonal Virus

Step 4: Remove Found Threats:

12. After the scan is complete, Trojan Killer will display a list of detected threats.

Searching Bisonal Finished

13. Click on "Cure PC!" to remove the identified malware from the infected PC.

14. Follow any additional on-screen prompts to complete the removal process.

Restart needed

Step 5: Restart Your Computer:

15. Once the threats are removed, click on "Restart PC" to reboot your computer.

16. Remove the USB flash drive from the infected computer.

Congratulations on effectively removing Bisonal and the concealed threats from your computer! You can now have peace of mind, knowing that they won't resurface again. Thanks to Gridinsoft's capabilities and commitment to cybersecurity, your system is now protected.

What is Backdoor:Win32/Bisonal!MSR Virus?

Name: Backdoor:Win32/Bisonal!MSR

Description: If you have seen a message showing the “Backdoor:Win32/Bisonal!MSR found”, it seems that your system is in trouble. The Bisonal virus was detected, but to remove it, you need to use a security tool. Windows Defender, which has shown you this message, has detected the malware. However, Defender is not a reliable thing - it is prone to malfunction when it comes to malware removal. Getting the Backdoor:Win32/Bisonal!MSR malware on your PC is an unpleasant thing, and removing it as soon as possible must be your primary task.

Operating System: Windows

Application Category: Backdoor

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  1. Gossip about the backdoor in Intel processors on Reddit.

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About the author

Wilbur Woodham

I was a technical writer from early in my career, and consider IT Security one of my foundational skills. I’m sharing my experience here, and I hope you find it useful.

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