Most antivirus programs identify sysmon.exe as malware—for example Kaspersky identifies it as Trojan.MSIL.Inject.cznv or Backdoor.Win32.Androm.haue, and Microsoft identifies it as Trojan:Win32/Skeeyah.A!bit or Backdoor:MSIL/Bladabindi!bit.
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The process known as TeamSpeak (version 3 Client) or Ph8tnbTaR or ForceOp or Ezoric1 or soffice
appears to belong to software TeamSpeak (version 3 Client) or BoxedApp Packer or Ph8tnbTaR or EnergyStudied or The Document Foundation or Ezoric1
by TeamSpeak Systems GmbH or LibreOffice or Virtualization Technologies or NiCRZKNef or Admin.
Description: Sysmon.exe is not essential for Windows and will often cause problems. Sysmon.exe is located in a subfolder of "C:\Program Files".
Known file sizes on Windows 10/8/7/XP are 532,480 bytes (11% of all occurrences), 372,736 bytes and 15 more variants.
Sysmon.exe is not a Windows system file. The program is not visible. Sysmon.exe is a file with no information about its developer. The process is loaded during the Windows boot process (see Registry key: RunOnce, Run, MACHINE\Run, Winlogon\Shell). Sysmon.exe is able to manipulate other programs and record keyboard and mouse inputs. Therefore the technical security rating is 81% dangerous, however you should also read the user reviews.
Recommended: Identify sysmon.exe related errors
If sysmon.exe is located in the C:\Windows folder, the security rating is 74% dangerous. The file size is 6,656 bytes. The file is located in the Windows folder, but it is not a Windows core file. The program is not visible. The application starts upon Windows startup (see Registry key: RunOnce, Run, MACHINE\Run, Winlogon\Shell). The software listens for or sends data on open ports to a LAN or the Internet. It is not a Windows core file. sysmon.exe appears to be a compressed file.
If sysmon.exe is located in the C:\Windows\System32 folder, the security rating is 36% dangerous. The file size is 38,400 bytes. Sysmon.exe is not a Windows core file. The process has no file description. The process starts when Windows starts (see Registry key: RunOnce, Run, MACHINE\Run, Winlogon\Shell). The program has a visible window. sysmon.exe appears to be a compressed file.
External information from Paul Collins:
There are different files with the same name:
Important: You should check the sysmon.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.
The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active sysmon process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the sysmon.exe on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.
A clean and tidy computer is the key requirement for avoiding PC trouble. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon 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 DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.