Should I block it?

No, this file is 100% safe to run.

VersionsAdditional versions

6.1.7600.16385 (win7_rtm.090713-1255) 22.81%
6.1.7600.16385 (win7_rtm.090713-1255) 34.05%
6.1.7600.16384 (win7_rtm.090710-1945) 0.07%
4.5.0218.0 2.22%
4.5.0216.0 1.70%
4.4.0304.0 1.18%
4.4.0207.0 0.07%
4.3.9600.16384 (winblue_rtm.130821-1623) 1.50%
4.3.9600.16384 (winblue_rtm.130821-1623) 0.07%
4.3.9431.0 (winmain_bluemp.130615-1214) 0.33%
4.3.9431.0 (winmain_bluemp.130615-1214) 0.07%
4.3.0219.0 2.55%
4.3.0216.0 0.98%
4.3.0215.0 1.18%
4.3.0215.0 0.39%
4.3.0215.0 0.85%
4.2.0223.0 4.97%
4.2.0223.0 4.97%
4.2.0223.0 0.39%
4.2.0223.0 4.05%
4.2.0216.0 0.20%
4.1.0522.0 9.15%
4.0.9200.16384 (win8_rtm.120725-1247) 1.18%
4.0.9200.16384 (win8_rtm.120725-1247) 3.27%
4.0.8400.0 (winmain_win8rc.120518-1423) 0.07%
View more



IOfficeAntiVirus Module by Microsoft Corporation (Signed)

Remove MpOAV.dll
Version:   4.2.0223.0
MD5:   41c34f15be216ac2233694376ca0ff9e
SHA1:   2fa2761084c0cab467960ac401ba012f7d3a7e66
SHA256:   95679dee109c39e18ce4cfdf4d9f583d964b41758ad628507b8e4969f3f82905
This is a Windows system installed file with Windows File Protection (WFP) enabled.

What is MpOAV.dll?

Microsoft Malware Protection is part of Microsoft Security Essentials suite of anti-virus products including Windows Defender and Microsoft Malware Protection. It intagrates with Microsoft Office 2007/2010 as an anti-virus plugin which is designed to scan downloaded files and document attachments for malware and takes actions if a virus or trojan is discovered. WIth Windows Vista, Microsoft Malware Protection Anti-Virus plugin was automatically installed.

About MpOAV.dll (from Microsoft Corporation)

Windows Defender is software that helps protect your computer against pop-ups, slow performance, and security threats caused by spyware and other unwanted software by detecting and removing known spyw


File name:mpoav.dll
Publisher:Microsoft Corporation
Product name:IOfficeAntiVirus Module
Description:Microsoft® Windows® Operating System
Typical file path:C:\Program Files\windows defender\mpoav.dll
File version:4.2.0223.0
Size:76.98 KB (78,824 bytes)
Issued to:Microsoft Corporation
Authority (CA):Microsoft Corporation
Expiration date:Monday, March 4, 2013
Digital DNA
File packed:No
More details


The following programs will install this file
Microsoft Corporation
8% remove
Microsoft Security Essentials is an antivirus software product that provides protection against different types of malware such as computer viruses, spyware, rootkits and Trojan horses. It runs on Windows XP, Windows Vista and Windows 7, but not on Windows 8, which has a built-in AV component. Built upon the same virus definitions and scanning engine as other Microsoft antivirus products, MSE provides real-time protection, constantly mo...
Microsoft Corporation
1% remove
The Microsoft Security Essentials Prerelease program allows users to run the latest & greatest versions of Security Essentials before they are publicy available.
Microsoft Corporation
1% remove
Microsoft Forefront is a family of line-of-business security software that are designed to help protect computer networks, network servers (such as Microsoft Exchange Server and Microsoft SharePoint Server) and individual devices.
Microsoft Corporation
5% remove
Security and management have traditionally existed as two separate disciplines, yet both play a central role in keeping your users safe and productive. Microsoft System Center 2012 Endpoint Protection (previously known as Forefront Endpoint Protection) allows you to consolidate desktop security and management in a single solution. Built on System Center 2012 Configuration Manager, System Center 2012 Endpoint Protection provides a sin...
Microsoft Corporation
1% remove
Manage PCs and multiple types of mobile devices in one unified solution, either through the cloud or by extending your existing on-premises infrastructure. Whether using corporate or employee-owned devices, Windows Intune helps provide a security-enhanced environment with comprehensive update and policy management. Use Windows Intune to give employees access to the resources and applications they need on the devices they choose without ...


IOffice antivirus plugins
  • {2781761E-28E1-4109-99FE-B9D127C57AFE}
  • {2781761E-28E0-4109-99FE-B9D127C57AFE}
Approved shell extensions
Located in the registry at 'SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved'
  • 'Windows Defender IOfficeAntiVirus implementation' with CLSID {2781761E-28E0-4109-99FE-B9D127C57AFE}

Windows OS versionsDistribution by Windows OS

OS versiondistribution
Windows 7 Home Premium 42.50%
Windows 7 Ultimate 19.50%
Windows 8.1 12.00%
Windows 7 Professional 8.50%
Windows 8.1 Pro 5.00%
Windows 8.1 Single Language 2.50%
Windows 7 Home Basic 2.00%
Windows 8 Pro 1.50%
Windows 8.1 Pro with Media Center 1.50%
Windows Vista Home Premium 1.00%
Microsoft Windows XP 1.00%
Windows 8 Enterprise N 0.50%
Windows 8.1 Enterprise Evaluation 0.50%
Windows 8 Single Language 0.50%
Windows 7 Starter 0.50%
Windows 8.1 Enterprise 0.50%
Windows 8.1 Pro Preview 0.50%

Distribution by countryDistribution by country

United States installs about 49.00% of IOfficeAntiVirus Module.

OEM distributionDistribution by PC manufacturer

PC Manufacturerdistribution
ASUS 21.14%
Dell 20.33%
Hewlett-Packard 17.89%
Acer 14.63%
Toshiba 9.76%
Lenovo 5.69%
Sony 4.07%
Samsung 1.22%
Alienware 0.81%
Intel 0.81%
Compaq 0.81%
Sahara 0.41%
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