What is oasclnt.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 oasclnt.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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Oasclnt.exe file information

Windows Task Manager with oasclnt
Oasclnt.exe process in Windows Task Manager

The process known as McAfee VirusScan OAS Client belongs to software McAfee VirusScan or McAfee VirusScan OAS Client or McAfee VirusScan API by McAfee (

Description: Oasclnt.exe is not essential for the Windows OS and causes relatively few problems. Oasclnt.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 53,248 bytes (92% of all occurrences) or 116,272 bytes. 
It is not a Windows system file. The program is not visible. The software starts when Windows starts (see Registry key: MACHINE\Run). Oasclnt.exe is able to hide itself. Therefore the technical security rating is 48% dangerous, however you should also read the user reviews.

Recommended: Identify oasclnt.exe related errors

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

McAfee virus scan client service
McAfee virus scan client service - don't close it
oasclnt.exe is a process belonging to McAfee Internet Security Suite which protects your computer against Internet-bound threats such as spyware and trojans which can be distributed through e-mail or attack directly to the computer allowing unauthorized access to your computer. This program is important for the stable and secure running of your computer and should not be terminated.
  Ron H.  
That it blows the donkeys load
  Sgt Cocksucker  
MCafee file
  AS!F J3e asif_nice1  
McAfee anti virus process
    (further information)
I use windows 2000 and i noticed that i cant open the internet explorer browser from the desktop or open a new window from a link on the internet unless i get rid of this process by first going to the task manager and taking of the explorer process and the taking this process off. Then i go to new process and type in explorer. That brings back the desktop
mcaffe virus software sucks, but if you insist on using them do NOT disable this program.
  Mike Chambers  

Rating chart

Summary: Average user rating of oasclnt.exe: based on 14 votes with 8 user comments. 12 users think oasclnt.exe is essential for Windows or an installed application. One user thinks it's probably harmless. One user thinks it's neither essential nor dangerous.

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Best practices for resolving oasclnt issues

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

oasclnt.exe [all]