What is CO_Mon?

CO_Mon.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if CO_Mon.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for CO_Mon drivers in need of updating

CO_Mon.sys file information

The process known as Behavior Blocker (version v2007.1 WDM driver (2007.1.1.99)) or CO_Mon belongs to software Norton Confidential Core or Behavior Blocker by Symantec (

Description: CO_Mon.sys is not essential for Windows and will often cause problems. CO_Mon.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 28,672 bytes (69% of all occurrences), 36,056 bytes or 34,304 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. The service has no detailed description. CO_Mon.sys is not a Windows system file. There is no information about the author of the file. The program is not active. Therefore the technical security rating is 20% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you run into problems with CO_Mon.sys, you can uninstall the program using the Control Panel ⇒ Uninstall a ProgramNorton Confidential Core.

Recommended: Identify CO_Mon.sys related errors

Important: Some malware disguises itself as CO_Mon.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the CO_Mon.sys 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

RootKit Hooked on Nt TerminateProcess, ZWTerminateProcess ; Syscall 257
  Toni   (further information)
Co_mon.sys is related to Symantec antiviral software.
  Eric Lhuillier   (further information)

Summary: Average user rating of CO_Mon.sys: based on 2 votes with 2 user comments. One user thinks it's probably harmless. One user thinks it's neither essential nor dangerous.

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Best practices for resolving CO_Mon issues

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

CO_Mon.sys [all]