What is op_mon.exe?

The genuine op_mon.exe file is a software component of Agnitum Outpost by Agnitum.
Op_mon.exe is a process which provides system tray access for the Outpost range of security applications such as Outpost Anti-virus, Outpost Firewall and the Outpost Security Suite. This is not an essential Windows file and can be removed if known to cause problems. Agnitum is a Russian company founded in St. Petersburg in February 1999. Agnitum develops security solutions for personal computers to protect consumers against viruses, spam, spyware, hackers, trojans and various other cyber threats.

op_mon stands for Outpost Monitor

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 op_mon.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.

Click to Run a Free Scan for op_mon.exe related errors

Op_mon.exe file information

Windows Task Manager with op_mon
Op_mon.exe process in Windows Task Manager

The process known as Outpost User Interface belongs to software Agnitum Outpost or Outpost Firewall (version 2009) or Outpost Security Suite by Agnitum (

Description: Op_mon.exe is not essential for the Windows OS and causes relatively few problems. Op_mon.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 1,207,128 bytes (10% of all occurrences), 2,374,464 bytes and 21 more variants. 
The program has a visible window. It is not a Windows system file. The process is loaded during the Windows boot process (see Registry key: MACHINE\Run). Op_mon.exe is a Verisign signed file. It is digitally signed. Op_mon.exe is able to record keyboard and mouse inputs and monitor applications. Therefore the technical security rating is 7% dangerous; however you should also read the user reviews.

Uninstalling this variant: The software vendor offers the option to do the following:
  1) uninstall the associated program (Start > Control Panel > Uninstall a Program > Outpost Firewall Pro or Agnitum Outpost Firewall Pro)
  2) turn to the software developer, Agnitum, for advice.

Recommended: Identify op_mon.exe related errors

If op_mon.exe is located in a subfolder of C:\, the security rating is 22% dangerous. The file size is 4,732,792 bytes. The program has no visible window. The op_mon.exe file is a Verisign signed file. The op_mon.exe file is certified by a trustworthy company. The file is not a Windows core file. Op_mon.exe is able to record keyboard and mouse inputs and monitor applications.

Uninstalling this variant: The software vendor offers the option to uninstall the associated program (Start > Control Panel > Uninstall a Program > Fraps).

Important: Some malware camouflages itself as op_mon.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the op_mon.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 Outpost firewall, Outpost security suite and Outpost firewall
  krecekvnocnikosili   (further information)
Outpost, Firewall
part of Outpost firewall, Outpost security suite and Outpost antivirus
  radce   (further information)
part of Outpost security suite
  qwert   (further information)
"op_mon.exe" ist Teil meiner Lavasoft Firewall, also nicht zwingend nur von der Outpost Firewall!
  Hotte666   (further information)

Summary: Average user rating of op_mon.exe: based on 5 votes with 5 user comments. 4 users think op_mon.exe is essential for Windows or an installed application. One user thinks it's probably harmless.

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Best practices for resolving op_mon issues

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

op_mon.exe [all]