Backdoor:JS/C99shell — Virus Removal Guide

Written by Wilbur Woodham
If you see the message reporting that the Backdoor:JS/C99shell was identified on your Windows PC, or in times when your computer works as well slow and offer you a huge amount of headaches, you definitely comprise your mind to scan it for C99 shell and clean it in a proper procedure. Today I will certainly inform to you exactly how to do it.
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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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C99 shell is uploaded to a compromised web application to provide an interface for allowing the attacker to issue commands on the server as the account under which PHP is running. The c99 shell allows an attacker to browse the filesystem, upload, view, and edit files.
C99 shell 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.

C99 shell 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.

C99 shell 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 C99 shell Backdoor
Detection Backdoor:JS/C99shell
Damage Gain access to the operating system to perform various malicious actions.
Similar Elfrit, Cycbot, Cinasquel, Mosucker, Wabot, Msil Chopper, Kelihos, Php C99shell
Fix Tool See If Your System Has Been Affected by C99 shell backdoor

Sorts of viruses that were well-spread 10 years ago are no longer the source of the issue. Currently, the problem is extra obvious in the areas of blackmail or spyware. The difficulty of fixing these problems requires different solutions and different techniques.

Does your antivirus regularly report about the “C99 shell”?

If you have seen a message indicating the “Backdoor:JS/C99shell found”, after that it’s a piece of great news! The malware “Backdoor:JS/C99shell” was detected and, probably, erased. Such messages do not imply that there was a really active C99 shell on your tool. You might have simply downloaded a documents which contained Backdoor:JS/C99shell, so your antivirus software program instantly erased it prior to it was introduced and also created the problems. Alternatively, the malicious script on the infected site can have been discovered and avoided prior to causing any kind of problems.

Backdoor:JS/C99shell found

Microsoft Defender: “Backdoor:JS/C99shell”

To put it simply, the message “Backdoor:JS/C99shell Found” during the common use of your computer does not mean that the C99 shell has completed its goal. If you see such a message then maybe the evidence of you checking out the infected page or loading the malicious documents. Try to avoid it in the future, yet do not panic excessive. Try out opening up the antivirus program and also checking the Backdoor:JS/C99shell detection log documents. This will give you even more details concerning what the precise C99 shell was detected and what was especially done by your anti-virus software application with it. Naturally, if you’re not positive sufficient, refer to the hand-operated scan– anyway, this will be practical.

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

If your system operates in an extremely slow way, the web pages open in an odd fashion, or if you see advertisements in places you’ve never ever expected, it’s possible that your computer got contaminated and the infection is currently active. Spyware will certainly track all your tasks or redirect your search or web page to the places you don’t want to go to. Adware might contaminate your internet browser as well as even the entire Windows OS, whereas the ransomware will attempt to obstruct your PC as well as require an incredible ransom money quantity for your very own data.

Regardless of the kind of the problem with your PC, the initial step is to check it with Gridinsoft Anti-Malware. This is the best tool to spot as well as cure your computer. Nevertheless, it’s not a simple antivirus software program. Its mission is to combat modern risks. Today it is the only product on the market that can just clean up the PC from spyware as well as other viruses that aren’t even found by normal antivirus programs. Download, install, and run Gridinsoft Anti-Malware, then check your computer. It will certainly direct you with the system cleanup process. You do not have to purchase a license to cleanse your PC, the preliminary permit offers you 6 days of a totally complimentary trial. Nevertheless, if you wish to protect on your own from long-term threats, you probably need to consider buying the certificate. In this manner we can assure that your computer will certainly no more be infected with infections.

How to scan your PC for Backdoor:JS/C99shell?

To examine your device for C99 shell as well as to get rid of all spotted malware, you want to have an antivirus. The current variations of Windows include Microsoft Defender — the integrated antivirus by Microsoft. Microsoft Defender is typically quite good, nonetheless, it’s not the only point you want to have. In our viewpoint, the very best antivirus option is to use Microsoft Defender in combo with Gridinsoft.

In this manner, you might get facility defense against the range of malware. To look for infections in Microsoft Defender, open it and also begin a new check. It will completely check your system for trojans. And also, certainly, Microsoft Defender works in the background by default. The tandem of Microsoft Defender and Gridinsoft will certainly set you free of most of the malware you may ever come across. On a regular basis arranged checks might likewise safeguard your computer in the future.

Use Safe Mode to fix the most complex Backdoor:JS/C99shell issues.

Safe mode

If you have Backdoor:JS/C99shell type that can barely be removed, you could require to take into consideration scanning for malware beyond the common Windows functionality. For this purpose, you need to start Windows in Safe Mode, thus stopping the system from loading auto-startup items, perhaps consisting of malware. Start Microsoft Defender examination and afterward scan with Gridinsoft in Safe Mode. This will assist you discover the infections that can’t be tracked in the routine mode.

Use Gridinsoft to remove C99 shell and other junkware.

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It’s not sufficient to just use the antivirus for the safety of your computer. You need to have an extra detailed antivirus solution. Not all malware can be detected by regular antivirus scanners that primarily try to find virus-type dangers. Your computer might have lots of “junk”, for instance, toolbars, browser plugins, shady internet search engines, bitcoin-miners, and various other sorts of unwanted software used for earning money on your lack of experience. Be cautious while downloading and install software online to stop your tool from being loaded with unwanted toolbars and various other junk data.

Nevertheless, if your system has currently obtained a certain unwanted application, you will certainly make your mind to remove it. Most of the antivirus programs are do not care regarding PUAs (potentially unwanted applications). To get rid of such software, I suggest acquiring Gridinsoft Anti-Malware. If you use it regularly for scanning your system, it will help you to get rid of malware that was missed by your antivirus software.

Frequently Asked Questions

🤔 How Do I Know My Windows 10 PC Has Backdoor:JS/C99shell?


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:JS/C99shell infection, 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:JS/C99shell Malware

Name: Backdoor:JS/C99shell

Description: If you have seen a message showing the “Backdoor:JS/C99shell found”, then it’s an item of excellent information! The pc virus C99 shell was detected and, most likely, erased. Such messages do not mean that there was a truly active C99 shell on your gadget. You could have simply downloaded and install a data that contained Backdoor:JS/C99shell, 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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