What is syshost.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the syshost.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Syshost.exe file information

The process known as H4vvexkjPWvs or syshost32 appears to belong to software O6RVlg2gH by SetuU2zySxT1HGiA or Guidance Software (

Description: Syshost.exe is not essential for Windows and will often cause problems. The file syshost.exe is located in a subfolder of C:\Windows. Known file sizes on Windows 10/8/7/XP are 288,768 bytes (10% of all occurrences), 152,576 bytes and 59 more variants. 
There is no file information. The syshost.exe file is not a Windows core file. The syshost.exe file is located in the Windows folder, but it is not a Windows core file. The program is not visible. Therefore the technical security rating is 79% dangerous, however you should also read the user reviews.

Recommended: Identify syshost.exe related errors

External information from Paul Collins:
There are different files with the same name:

Important: Some malware also uses the file name syshost.exe, for example TROJ_GEN.RCBCDHH (detected by TrendMicro), and VirTool:Win32/Obfuscator.XX or TrojanDropper:Win32/Necurs.gen!A (detected by Microsoft). Therefore, you should check the syshost.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

came with formatsys.exe, serbw.exe and msmbw.exe in a file transferred through msn messenger
  stuart parkinson  
remote spy server
It's part of Lunasoft's Parents Firends Administrator
  Stan   (further information)
My AntiVirus says trojan found every time i restart my computer and i remove it every time
it is also found in systems installer folder,im sure it is a spyware type which is dangerous
  mangesh bhidkar  
eve if it is not a system operated ,it do not stop , making it a very STRONG virus. making my computer huge slow & disabling my firewall!
variant virus Win32/Rootkit.Kryptik.ZI Troyano. C:\WINDOWS\Installer\{1C3D9A9F-0E26-E924-CD05-E757ACD7781B}\syshost.exe Disabling my firewall
It can host your files on the malware creator's server

Rating chart

Summary: Average user rating of syshost.exe: based on 14 votes with 8 user comments. 2 users think syshost.exe is essential for Windows or an installed application. One user thinks it's neither essential nor dangerous. 2 users suspect danger. 9 users think syshost.exe is dangerous and recommend removing it. One user is not sure about it.

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Best practices for resolving syshost issues

A clean and tidy computer is the key requirement for avoiding problems with syshost. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the syshost.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

syshost.exe [all]