Backdoor:PHP/C99shell.T — Virus Removal Guide

If you see the message reporting that the Backdoor:PHP/C99shell.T was located on your computer, or in times when your computer system functions as well slowly and also give you a lot of migraines, you certainly make up your mind to check it for C99shell and also clean it in a correct method. Today I will certainly explain to you how to do it.
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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.
C99shell 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.

C99shell 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.

C99shell 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 C99shell Backdoor
Detection Backdoor:PHP/C99shell.T
Damage Gain access to the operating system to perform various malicious actions.
Similar Msil Pontoeb, Androme, Mozarkerv, Python Tortoishell, Cobaltstrike, Php Webshell, Php Brobot, Veden
Fix Tool See If Your System Has Been Affected by C99shell backdoor

Kinds of viruses that were well-spread 10 years ago are no longer the resource of the trouble. Presently, the problem is extra noticeable in the areas of blackmail or spyware. The obstacle of repairing these issues requires different softwares and also different methods.

Does your antivirus regularly report about the “C99shell”?

If you have seen a message indicating the “Backdoor:PHP/C99shell.T found”, after that it’s an item of good information! The infection “Backdoor:PHP/C99shell.T” was discovered as well as, most likely, erased. Such messages do not mean that there was an actually active C99shell on your tool. You can have simply downloaded a documents which contained Backdoor:PHP/C99shell.T, so your anti-virus software immediately erased it before it was launched and triggered the difficulties. Alternatively, the malicious manuscript on the infected internet site could have been found as well as stopped prior to triggering any kind of troubles.

Backdoor:PHP/C99shell.T found

Microsoft Defender: “Backdoor:PHP/C99shell.T”

Simply put, the message “Backdoor:PHP/C99shell.T Found” throughout the common use your computer system does not indicate that the C99shell has actually completed its objective. If you see such a message then it could be the evidence of you visiting the contaminated web page or filling the harmful file. Try to prevent it in the future, however don’t fret too much. Trying out opening the antivirus program and checking the Backdoor:PHP/C99shell.T detection log file. This will offer you even more details about what the precise C99shell was found and what was specifically done by your antivirus software program with it. Naturally, if you’re not confident sufficient, describe the manual scan– at any rate, this will certainly be helpful.

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

If your computer works in an extremely lagging way, the website open in an odd way, or if you see ads in places you’ve never anticipated, it’s feasible that your computer obtained contaminated as well as the virus is now active. Spyware will track all your activities or redirect your search or web page to the locations you do not wish to visit. Adware might infect your browser as well as even the entire Windows OS, whereas the ransomware will certainly attempt to obstruct your system and also demand a tremendous ransom money quantity for your very own data.

Regardless of the kind of trouble with your PC, the very first step is to check it with Gridinsoft Anti-Malware. This is the best app to identify as well as cure your PC. Nonetheless, it’s not a basic antivirus software. Its objective is to deal with modern threats. Right now it is the only application on the market that can just cleanse the PC from spyware as well as other infections that aren’t also detected by routine antivirus software programs. Download, set up, as well as run Gridinsoft Anti-Malware, then check your computer. It will guide you through the system cleanup procedure. You do not need to purchase a permit to cleanse your PC, the initial license gives you 6 days of a completely totally free trial. Nevertheless, if you want to protect on your own from irreversible threats, you most likely require to consider buying the certificate. In this manner we can assure that your computer will no longer be contaminated with infections.

How to scan your PC for Backdoor:PHP/C99shell.T?

To examine your computer for C99shell and also to get rid of all discovered malware, you need an antivirus. The existing versions of Windows include Microsoft Defender — the built-in antivirus by Microsoft. Microsoft Defender is typically rather excellent, nonetheless, it’s not the only point you need to get. In our opinion, the best antivirus remedy is to make use of Microsoft Defender in the mix with Gridinsoft.

In this manner, you might get facility protection versus a variety of malware. To look for pc virus in Microsoft Defender, open it and start a new scan. It will completely examine your computer for pc virus. And also, naturally, Microsoft Defender works in the background by default. The tandem of Microsoft Defender and also Gridinsoft will establish you free of the majority of the malware you could ever come across. On a regular basis set up checks may likewise secure your computer in the future.

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

Safe mode

If you have Backdoor:PHP/C99shell.T kind that can rarely be removed, you may need to consider scanning for malware past the common Windows functionality. For this objective, you need to start Windows in Safe Mode, therefore protecting against the system from loading auto-startup items, perhaps including malware. Start Microsoft Defender checkup and after that scan with Gridinsoft in Safe Mode. This will certainly aid you to find the viruses that can’t be tracked in the routine mode.

Use Gridinsoft to remove C99shell and other junkware.

GridinSoft Anti-Malware

It’s not sufficient to just use the antivirus for the safety of your device. You need to have much more detailed antivirus service. Not all malware can be found by standard antivirus scanners that primarily look for virus-type risks. Your system may contain “trash”, for example, toolbars, internet browser plugins, shady internet search engines, bitcoin-miners, as well as various other types of unwanted programs used for generating income on your lack of experience. Be cautious while downloading apps on the internet to stop your gadget from being filled with unwanted toolbars and also various other junk data.

However, if your system has actually currently obtained a specific unwanted application, you will certainly make your mind to erase it. The majority of the antivirus programs are do not care about PUAs (potentially unwanted applications). To get rid of such programs, I suggest acquiring Gridinsoft Anti-Malware. If you use it regularly for scanning your PC, it will certainly aid you to remove malware that was missed by your antivirus program.

Frequently Asked Questions

🤔 How Do I Know My Windows 10 PC Has Backdoor:PHP/C99shell.T?


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:PHP/C99shell.T infection, please download the GridinSoft Anti-Malware that I recommended. Also, you can always ask me in the comments for getting help.

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Wilbur Woodham
How to Remove Backdoor:PHP/C99shell.T Malware

Name: Backdoor:PHP/C99shell.T

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