What is gcasServ.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 gcasServ.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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GcasServ.exe file information

The process known as Microsoft AntiSpyware Service belongs to software Microsoft AntiSpyware (Beta (version 1)) or Microsoft AntiSpyware by Microsoft ( or GIANT Company Software inc (

Description: GcasServ.exe is not essential for the Windows OS and causes relatively few problems. GcasServ.exe is located in a subfolder of "C:\Program Files"—e.g. C:\Program Files\Microsoft AntiSpyware\. Known file sizes on Windows 10/8/7/XP are 473,928 bytes (70% of all occurrences), 473,920 bytes, 24,076 bytes or 446,464 bytes. 
GcasServ.exe is not a Windows system file. The file has a digital signature. The process starts when Windows starts (see Registry key: MACHINE\Run). You can uninstall this program in the Control Panel. The program has a visible window. GcasServ.exe is able to monitor applications. Therefore the technical security rating is 7% dangerous; however you should also read the user reviews.

Uninstalling this variant: You can safely remove the program using the uninstall program of Microsoft AntiSpyware or GIANT AntiSpyware (Control Panel ⇒ Uninstall a Program).

Recommended: Identify gcasServ.exe related errors

If gcasServ.exe is located in the C:\Windows folder, the security rating is 80% dangerous. The file size is 20,992 bytes. There is no file information. The program is not visible. The file is an unknown file in the Windows folder. The application starts when Windows starts (see Registry key: MACHINE\Run). The gcasServ.exe file is not a Windows system file.

External information from Paul Collins:

Important: Some malware camouflages itself as gcasServ.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the gcasServ.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

Giant AntiSpyware/Microsoft AntiSpyware
  George Belton  
It's part of microsoft's antispyware program
  The Proff   (further information)
looks like it is part of microsoft's new product - giant anti spyware
  yo mama  
microsoft antispyware
It's the Microsoft AntiSpyware program wich uses the Giant AntiSpyware Service. I think Microsoft bought Giant and that's why they started this new service.
  ED   (further information)
Appeared when Microsoft AntiSpyware was installed
MS Anti-Spyware Beta 1
Microsoft Anti Spyware Module
  R Swipe  
Microsoft AntiSpyware (Beta 1)
  Steen Sepstrup   (further information)
this file is linked with MS AntiSpyware program
Monitoring service for Windows AntiSpyware (Beta)
this is an antispyware program the experance i have had with this program is good
  Richard   (further information)
MS spyware detector - harmless
With this file loaded at startup I could not launch MS Exployer. I removed it and MS Exployer functioned OK.
  C. Davidson  
MS Antispy catching more in it's Beta than any other program has!
  Sean A. Turvey U.E.   (further information)
the file is part of microsofts anti spyware package, the reason it may have stop ms explorer, is because its system agents
part of the new Microsoft"s anti Spyware
Microsoft Anti Spyware
Should not be removed or disabled, needed for MS Anti-spyware
  Elric Ward  
MS Anti Spyware beta. Uses lots of system resources - may be worth unloading manually if you're running resource hungry apps like newer games ets...

Rating chart

Summary: Average user rating of gcasServ.exe: based on 27 votes with 20 user comments. 25 users think gcasServ.exe is essential for Windows or an installed application. One user thinks it's probably harmless. One user thinks gcasServ.exe is dangerous and recommends removing it. 2 users don't grade gcasServ.exe ("not sure about it").

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Best practices for resolving gcasServ issues

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

gcasServ.exe [all]