Backdoor:MSIL/Chopper.M!dha — Virus Removal Guide

If you see the message reporting that the Backdoor:MSIL/Chopper.M!dha was identified on your computer, or in times when your computer system functions as well slow and also give you a lot of migraines, you definitely make up your mind to check it for Chopper as well as clean it in a proper method. Right now I will certainly inform to you exactly how to do it.
Wilbur Woodham
Wilbur Woodham
IT Security Expert

It is better to prevent, than repair and repent!

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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Chopper is a web shell approximately 4 kilobytes in size. This web shell is used by malicious Chinese actors, including advanced persistent threat (APT) groups, to remotely control web servers. Chopper backdoor has two parts, the client interface (an executable file) and the receiver host file on the compromised web server.

Backdoor Chopper has many commands and control features such as a password brute-force attack option, code obfuscation, file and database management, and a graphical user interface.

Chopper backdoor is an illegal tool to gain access to a server or computer bypassing the security mechanisms of the system.

Typically, attackers create a backdoors to gain access to the operating system to perform various actions. This can be stealing passwords and credit card numbers (aka spyware), installing ransomware, or cryptocurrency miners.

Chopper backdoor is often installed as part of an exploit. And in some cases, the backdoor enters the computer as a result of a previous attack.

Chopper is often difficult to detect, and detection methods vary greatly depending on the version of the malware. In some cases, antivirus software can detect a backdoor. In other cases, security professionals may need to use specialized tools to detect backdoors or use a protocol monitoring tool to inspect network packets.

Name Chopper Backdoor
Detection Backdoor:MSIL/Chopper.M!dha
Damage Gain access to the operating system to perform various malicious actions.
Similar Php C99shell, Zbot, Msil Pontoeb, Androme, Mozarkerv, Python Tortoishell, Cobaltstrike, Php Webshell
Fix Tool See If Your System Has Been Affected by Chopper backdoor

Does your antivirus regularly report about the “Chopper”?

If you have seen a message showing the “Backdoor:MSIL/Chopper.M!dha”, you have to hurry up and remove the threat. Virus is not omnipotent and immediate-action, it requires some time (and, possibly, system restarts) to do its dirty job. But the less time you give the Oneeva downloader to act – the less the chance that your computer will be full of viruses. Spectating the “Trojan:Script/Oneeva.a!ml” detection must be a trigger for you to scan your device with the security tool.

Backdoor:MSIL/Chopper.M!dha found

Microsoft Defender: “Backdoor:MSIL/Chopper.M!dha”

In other words, the message “Backdoor:MSIL/Chopper.M!dha Found” during the usual use of your computer does not suggest that the Chopper backdoor has completed its mission. Usually, Defender shows you that notification when it detects suspicious activity. And since that anti-malware tool is embedded in your system, it can detect the malicious activity on extremely early timings. But the removal of Backdoor:MSIL/Chopper.M!dha is not a thing you can conduct with Defender, because of its poorly designed removal mechanism. The threat can hold up in the system for up to several weeks, and only the usage of other antivirus tools will make your system clean. Exactly, that’s why I recommend you to use a third-party program, such as GridinSoft Anti-Malware.

How to scan for malware, spyware, ransomware, adware, and other threats.

The main sign of malware injection, which you can spectate on your device, is the general slowdown. Malware activity can consume a lot of hardware capacity, especially if we are talking about coin miners. You must not ignore these signs, because, as I have mentioned before, the efficiency of malware depends on the time you give it for actions. Forehanded detection of Backdoor:MSIL/Chopper.M!dha is also the way to prevent the appearance of additional viruses.

Regardless of the exact symptoms, you need to scan your device with the proper anti-malware software. Besides the aforementioned disadvantages, Microsoft Defender also has a problem with database updates. That antivirus tool cannot update its detections as other tools do. To apply the new databases, you need to install all past detection database updates, and get the newest ones, performing several reboots in the process. Because of such a long update cycle, Defender cannot provide the proper scanning functionality. GridinSoft Anti-Malware is able to detect the viruses at any moment, since its detection lists are updated every hour.

How to scan your PC for Backdoor:MSIL/Chopper.M!dha?

Using the GridinSoft Anti-Malware, you can get rid of that virus in several clicks. However, malware creators have their own methods of counteraction. A lot of modern viruses are able to block the launching of installation files of popular anti-malware tools. GridinSoft’s program is among those tools. To prevent the virus launching, you need to reboot your system into the Safe Mode with Networking. Such a setting allows the usage of networking, but blocks the launching of all third-party software. The virus will not be able to launch and block the antivirus installation.

Use Safe Mode to fix the most complex Backdoor:MSIL/Chopper.M!dha issues.

To launch your system in Safe Mode with Networking, open the Start menu. In that menu, press the Power icon, hold “Shift” button and choose the Restart option.

Reboot into troubleshooting

You will see the Troubleshooting mode screen. In that Windows mode, system allows you to choose the system recovery options. Follow the instructions you see below.

Safe mode

After pressing the Safe Mode button, your computer will automatically restart into that mode. After these steps, you can perform the virus removal without any doubts.

Use Gridinsoft to remove Chopper and other junkware.

  • Download GridinSoft Anti-Malware by pressing the button above. Install it to proceed the malware removal. Right after the installation program will offer you to start the Standard scan.
  • GSAM during the scan process

  • Standard scan takes 3-6 minutes. It checks the disk where the system keeps its files. The majority of viruses place their files on that disk.
  • Scan results

  • After the scan is over, you can choose the action for each detected malicious item. For all dangerous viruses the default action is “Delete”. Press “Apply” to remove the viruses from your computer.
  • GSAM - After Cleaning

Frequently Asked Questions

🤔 How Do I Know My Windows 10 PC Has Backdoor:MSIL/Chopper.M!dha?


There are many ways to tell if your Windows 10 computer has been infected. Some of the warning signs include:

  • Computer is very slow.
  • Applications take too long to start.
  • Computer keeps crashing.
  • Your friends receive spam messages from you on social media.
  • You see a new extension that you did not install on your Chrome browser.
  • Internet connection is slower than usual.
  • Your computer fan starts up even when your computer is on idle.
  • You are now seeing a lot of pop-up ads.
  • You receive antivirus notifications.

Take note that the symptoms above could also arise from other technical reasons. However, just to be on the safe side, we suggest that you proactively check whether you do have malicious software on your computer. One way to do that is by running a malware scanner.

🤔 How to scan my PC with Microsoft Defender?


Most of the time, Microsoft Defender will neutralize threats before they ever become a problem. If this is the case, you can see past threat reports in the Windows Security app.

  1. Open Windows Settings. The easiest way is to click the start button and then the gear icon. Alternately, you can press the Windows key + i on your keyboard.
  2. Click on Update & Security
  3. From here, you can see if your PC has any updates available under the Windows Update tab. This is also where you will see definition updates for Windows Defender if they are available.
  4. Select Windows Security and then click the button at the top of the page labeled Open Windows Security.

    Windows Security

  5. Select Virus & threat protection.
  6. Select Scan options to get started.

    Windows Security Scan options

  7. Select the radio button (the small circle) next to Windows Defender Offline scan Keep in mind, this option will take around 15 minutes if not more and will require your PC to restart. Be sure to save any work before proceeding.
  8. Click Scan now

If you want to save some time or your start menu isn’t working correctly, you can use Windows key + R on your keyboard to open the Run dialog box and type “windowsdefender” and then pressing enter.

From the Virus & protection page, you can see some stats from recent scans, including the latest type of scan and if any threats were found. If there were threats, you can select the Protection history link to see recent activity.

If the guide doesn’t help you to remove Backdoor:MSIL/Chopper.M!dha virus, please download the GridinSoft Anti-Malware that I recommended. Also, you can always ask me in the comments for getting help. Good luck!

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Wilbur Woodham
How to Remove Backdoor:MSIL/Chopper.M!dha Malware

Name: Backdoor:MSIL/Chopper.M!dha

Description: If you have seen a message showing the “Backdoor:MSIL/Chopper.M!dha found”, then it’s an item of excellent information! The pc virus Chopper was detected and, most likely, erased. Such messages do not mean that there was a truly active Chopper on your gadget. You could have simply downloaded and install a data that contained Backdoor:MSIL/Chopper.M!dha, so Microsoft Defender automatically removed it before it was released and created the troubles. Conversely, the destructive script on the infected internet site can have been discovered as well as prevented prior to triggering any kind of issues.

Operating System: Windows

Application Category: Backdoor

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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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