What is GCS.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 GCS.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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GCS.exe file information

Windows Task Manager with GCS
GCS.exe process in Windows Task Manager

The process known as Gnab Service belongs to software MEDIONbox by Empolis GmbH (

Description: GCS.exe is not essential for the Windows OS and causes relatively few problems. GCS.exe is located in a subfolder of "C:\Program Files". The file size on Windows 10/8/7/XP is 16,384 bytes. 
There is no description of the program. The program has no visible window. GCS.exe is not a Windows system file. The program listens for or sends data on open ports to a LAN or the Internet. GCS.exe appears to be a compressed file. Therefore the technical security rating is 55% dangerous.

Uninstalling this variant: In case of problems with GCS.exe, you can also completely remove MEDIONbox or Pixbox (Control Panel ⇒ Uninstall a Program) or look for help on the website.

Recommended: Identify GCS.exe related errors

If GCS.exe is located in a subfolder of the user's profile folder, the security rating is 36% dangerous. The file size is 243,569 bytes. The program has a visible window. There is no description of the program. The application is loaded during the Windows boot process (see Registry key: Run). The file is not a Windows core file.

Important: Some malware camouflages itself as GCS.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder, for example ADW_WEBPREFIX (detected by TrendMicro), and MemScan:Trojan.Generic.6626843 (detected by F-Secure). Therefore, you should check the GCS.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.


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Best practices for resolving GCS issues

A clean and tidy computer is the key requirement for avoiding problems with GCS. 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.

To help you analyze the GCS.exe process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

GCS.exe [all]