What is COSService.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 COSService.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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COSService.exe file information

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

The process known as COMODO COSService or Comodo Online Storage Service or COMODO BackUp or Comodo COSService belongs to software COMODO Backup or COMODO Cloud or Comodo Online Storage Cloud by COMODO Security Solutions ( or Comodo Security Solutions (

Description: COSService.exe is not essential for the Windows OS and causes relatively few problems. The COSService.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 3,550,400 bytes (37% of all occurrences), 630,704 bytes and 4 more variants. 
The program has no visible window. The file is digitally signed. The COSService.exe file is not a Windows core file. COSService.exe is able to monitor applications. Therefore the technical security rating is 28% dangerous, however you should also read the user reviews.

Uninstalling this variant: It is possible to ask for help from Support or uninstall COMODO Common or COMODO BackUp software via Windows Control Panel/Add or Remove Programs (Windows XP) or Programs and Features (Windows 10/8/7).

Recommended: Identify COSService.exe related errors

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

part of Comodo BackUp which provides online backup for users data
  meetoo   (further information)

Summary: Average user rating of COSService.exe: based on 1 vote with 1 user comment. One user thinks COSService.exe is essential for Windows or an installed application.

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Best practices for resolving COSService issues

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

COSService.exe [all]