What is CNTAoSMgr.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 CNTAoSMgr.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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CNTAoSMgr.exe file information

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

The process known as Trend Micro OfficeScan Client Plug-in Service Manager or Trend Micro OfficeScan Add-on Service Client Management Service belongs to software Trend Micro OfficeScan Client or Trend Micro Trend Micro Plug-in Manager or Trend Micro Plug-in Manager by Trend Micro (

Description: CNTAoSMgr.exe is not essential for the Windows OS and causes relatively few problems. CNTAoSMgr.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 435,584 bytes (41% of all occurrences), 415,352 bytes and 4 more variants. 
The program has no visible window. It is a Verisign signed file. The file has a digital signature. The file is not a Windows system file. CNTAoSMgr.exe is able to monitor applications. Therefore the technical security rating is 20% dangerous; however you should also read the user reviews.

Uninstalling this variant: You have the option to uninstall Trend Micro OfficeScan Client or Trend Micro Client/Server from your computer using the Control Panel applet Uninstall a Program or consult's Customer Service for advice.

Recommended: Identify CNTAoSMgr.exe related errors

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

this is process trend micro (antivirus)
  Simba - RUS  
cntaosmgr.exe is a Trend Micro OfficeScan Add-on Service Client Management Service developed by Trend Micro Inc.
Needs CPU-Usage!

Summary: Average user rating of CNTAoSMgr.exe: based on 2 votes with 3 user comments. 2 users think it's probably harmless. One user is not sure about it.

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Best practices for resolving CNTAoSMgr issues

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

CNTAoSMgr.exe [all]