Trojan

Remove Csrss.exe Тrojan


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This page aims to help you remove Csrss.exe. Our removal instructions work for every version of Windows.

Csrss.exe is an important Windows process that must be running at all times in order for the system to function properly. The name stands for Client/Server Run-Time Subsystem, and if this process is killed, you are likely to get a BSOD (Blue Screen of Death) crash.

 Csrss.exe Trojan is a collective name given to Trojan Horses that try to disguise themselves as the csrss.exe file or to integrate themselves with the csrss.exe process in order to avoid getting detected. It is important to be able to distinguish between the legitimate Windows csrss.exe process and a potential csrss.exe Trojan, otherwise you may end up crashing your system or, alternatively, allowing some malicious piece of software to operate in the computer undisturbed.

Signs there is a hidden Csrss.exe Trojan

The csrss.exe system file should be located in the C:\Windows\System32 folder, and it is the only place in your computer where such a file should be present. If there is a file named csrss.exe elsewhere in the machine, then it is probably malware and needs to be removed.

 The quickest way to check if there is a Csrss.exe Trojan in your computer is to check the file location of the csrss.exe process from your Task Manager.

csrss.exe Trojan

Checking the Task Manager for a csrss.exe Trojan process.

What you’d need to do is open the Task Manager, and go to its Processes tab. Find the csrss.exe process, right click on it, and select the Open File Location button. If the next thing you see is the System32 folder, then it’s all good. However, if the file location is different, it means you are most likely have a csrss.exe on your hands. Also, if there are more than one csrss.exe processes in the Task Manager, one of them is probably fake and is coming from a malware in your computer. To check which one is which, go to their Folder locations as explained above.

Note: Finding a fake csrss.exe file, stopping its process, and deleting it may not be enough to deal with the related Trojan, because the malware may have also made alterations in the Registry Editor, and may have files in other locations. This is why we advise you to use the detailed removal guide we have here, and/or the anti-malware program linked in it in order to make sure your PC is secure.

Hoaxes related to Csrss.exe

In some cases, scammers or developers of junkware may try to mislead you into thinking that the legit csrss.exe process in your system is a csrss.exe Trojan. This could be just as dangerous as having an actual Trojan, because messing with this process may lead to severe consequences in the computer.

 If, for example, an online prompt, or some newly-installed app from an unknown developer tells you that the csrss.exe process in your computer is malware, ignore this warning and do not touch the process. The only time you should kill this process, and delete the file related to it is if a reliable antivirus or anti-malware tool tells you to do that, or if you have followed our instructions, and have concluded that the process and its file aren’t coming from Windows. In case you try our guide, but have any doubts with regard to the nature of csrss.exe, be sure to contact us in the comments, and tell us about it before you go on to delete anything.

SUMMARY:

Name csrss.exe
Type Trojan
Danger Level High (Trojans are often used as a backdoor for Ransomware)
Symptoms Two or more csrss.exe processes in the Task Manager (there should only be one), and/or csrss.exe file in a folder other than System32. Also, any unusual system activity or behavior could be an additional sign of the presence of a Trojan.
Distribution Method Any malware-distribution method you could think of – spam letters with questionable attachments, misleading links, fake updates, pirated software, clickbait buttons, and more.
Detection Tool

Remove Csrss.exe Trojan

If you have a Windows virus, continue with the guide below.

If you have a Mac virus, please use our How to remove Ads on Mac guide.

If you have an Android virus, please use our Android Malware Removal guide.

If you have an iPhone virus, please use our iPhone Virus Removal guide


Step1

Some of the steps will likely require you to exit the page. Bookmark it for later reference.

Reboot in Safe Mode (use this guide if you don’t know how to do it).

Step2

WARNING! READ CAREFULLY BEFORE PROCEEDING!

Press CTRL + SHIFT + ESC at the same time and go to the Processes Tab. Try to determine which processes are dangerous. 

malware-start-taskbar

Right click on each of them and select Open File Location. Then scan the files with our free online virus scanner:

Drag and Drop Files Here to Scan
Maximum file size: 128MB.

This scanner is free and will always remain free for our website's users. You can find its full-page version at: https://howtoremove.guide/online-virus-scanner/




Scan Results


Virus Scanner Result
ClamAV
AVG AV
Maldet


After you open their folder, end the processes that are infected, then delete their folders. 

Note: If you are sure something is part of the infection – delete it, even if the scanner doesn’t flag it. No anti-virus program can detect all infections. 

Step3

Hold together the Start Key and R. Type appwiz.cpl –> OK.

appwiz

You are now in the Control Panel. Look for suspicious entries. Uninstall it/them. If you see a screen like this when you click Uninstall, choose NO:

virus-removal1

Step4

Type msconfig in the search field and hit enter. A window will pop-up:

msconfig_opt

Startup —> Uncheck entries that have “Unknown” as Manufacturer or otherwise look suspicious.

  • Remember this step – if you have reason to believe a bigger threat (like ransomware) is on your PC, check everything here.

Hold the Start Key and R –  copy + paste the following and click OK:

notepad %windir%/system32/Drivers/etc/hosts

A new file will open. If you are hacked, there will be a bunch of other IPs connected to you at the bottom. Look at the image below:

hosts_opt (1)

If there are suspicious IPs below “Localhost” – write to us in the comments.

Step5

Type Regedit in the windows search field and press Enter.

Once inside, press CTRL and F together and type the virus’s Name. Right click and delete any entries you find with a similar name. If they don’t show up this way, go manually to these directories and delete/uninstall them:

  • HKEY_CURRENT_USER—-Software—–Random Directory. It could be any one of them – ask us if you can’t discern which ones are malicious.
    HKEY_CURRENT_USER—-Software—Microsoft—-Windows—CurrentVersion—Run– Random
    HKEY_CURRENT_USER—-Software—Microsoft—Internet Explorer—-Main—- Random

If the guide doesn’t help, download the anti-virus program we recommended or try our free online virus scanner. Also, you can always ask us in the comments for help!


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