What is oasrv.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 oasrv.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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Oasrv.exe file information

Windows Task Manager with oasrv
Oasrv.exe process in Windows Task Manager

The process known as Online Armor Component belongs to software Online Armor Firewall or Emsisoft Online Armor or Online Armor Security Suite or Online Armor or Online Armor Personal Firewall by Tall Emu ( or Emsisoft GmbH or Emsi Software GmbH (

Description: Oasrv.exe is not essential for the Windows OS and causes relatively few problems. The oasrv.exe file is located in a subfolder of "C:\Program Files" or sometimes in a subfolder of the user's profile folder. Known file sizes on Windows 10/8/7/XP are 4,457,688 bytes (19% of all occurrences), 3,142,344 bytes and 26 more variants. 
The program has no visible window. The oasrv.exe file is not a Windows core file. It can change the behavior of other programs or manipulate other programs. Oasrv.exe is digitally signed. Oasrv.exe is able to connect to the Internet, record keyboard and mouse inputs, monitor applications and manipulate other programs. Therefore the technical security rating is 57% dangerous, however you should also read the user reviews.

Uninstalling this variant: You can uninstall the program Online Armor, update it, or ask Customer Support for help. Go to to update it, go to for support, or go to Online Armor in Windows Control Panel (Software or Programs section) to uninstall it.

Recommended: Identify oasrv.exe related errors

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

I think it is a service installed by Online Armor firewall
  Pranesh Bhargava  
part of well-known firewall Emsisoft Online Armor Firewall
  meetoo   (further information)
It is giving me error messages!!!
free firewall

Summary: Average user rating of oasrv.exe: based on 2 votes with 4 user comments. 2 users think oasrv.exe is essential for Windows or an installed application. 2 users don't grade oasrv.exe ("not sure about it").

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Best practices for resolving oasrv issues

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

oasrv.exe [all]