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What is mpoav.dll?

Part of Windows Defender by Microsoft

What is it?

IOfficeAntiVirus Module scans for malware when opening a file. 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.

What if I disable Windows Defender?

If this is disabled then Microsoft Malware Protection will not be able to protect Microsoft Office from malware and other viruses. Keeping this enabled is recommended.
Description of mpoav.dll from Microsoft
Windows Defender is a free program that helps you stay productive by protecting your computer against pop-ups, slow performance and security threats caused by spyware and other potentially unwanted software. Windows Defender provides real-time protection for your home or small business PC that guards against viruses, spyware, and other malicious software. Windows Defender is a free* download from Microsoft that is simple to install, easy to use, and is automatically updated to protect your PC with the latest technology. Microsoft Security Essentials runs quietly and efficiently in the background so that you are free to use your Windows-based PC the way you want—without interruptions or long computer wait times. Windows Defender is able to detect and remove more threats posed by spyware and other potentially unwanted software. Real Time Protection has also been enhanced to better monitor key points in the operating system for changes.
(mpoav.dll is a system file that is installed with Windows)
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How is mpoav.dll loaded?

Approved shell extension - mpoav.dll has a CLSID (globally unique identifier) of {2781761E-28E0-4109-99FE-B9D127C57AFE} with and identifier of Windows Defender IOfficeAntiVirus implementation. When the system detects that the user is downloading an external program that runs as part of the Windows user interface, the system searches for a digital certificate or requests that the user approve the action. If you enable this policy, Windows only starts approved programs.
IOffice antivirus plugin - mpoav.dll has a CLSID (globally unique identifier) of {2781761E-28E0-4109-99FE-B9D127C57AFE} with and identifier of CLSID\{2781761E-28E0-4109-99FE-B9D127C57AFE}\Implemented Categories\{56FFCC30-D398-11D0-B2AE-00A0C908FA49}. This used by an antivirus scanner to interact with a Microsoft Office application to active an antivirus scan of a file such as a Word or Excel document of embedded attachments.


What is the community is seeing?What is the community is doing?
About 0.1% of all Boost users have the mpoav.dll file.Of the 0.1% of mpoav.dll users, less than 1% have disabled it.
Typical file (disk image) location:
C:\Program Files\windows defender\mpoav.dll

What else is related?

What Windows OS versions does this run on?

Windows Vista (TM) Home Premium (6.0.6002.131072)
Windows Vista (TM) Ultimate (6.0.6002.131072)
Windows Vista™ Home Premium (6.0.6002.131072)

About Microsoft Corporation

Microsoft, founded in 1975 by Bill Gates and Paul Allen, is a veteran software company, best known for its Microsoft Windows operating system and the Microsoft More...
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File details

File name: mpoav.dll
Publisher: Microsoft Corporation (verified)
Name: Windows Defender
Description: IOfficeAntiVirus Module
Version: 1.1.1600.0
Size: 111.55 KB
Original file name: MpOAV.dll
Windows file protection: Yes

Digital certificate

Approved shell extension details

CLSID: {2781761E-28E0-4109-99FE-B9D127C57AFE}
Command: Windows Defender IOfficeAntiVirus implementation

IOffice antivirus plugin details

CLSID: {2781761E-28E0-4109-99FE-B9D127C57AFE}
Command: CLSID\{2781761E-28E0-4109-99FE-B9D127C57AFE}\Implemented Categories\{56FFCC30-D398-11D0-B2AE-00A0C908FA49}

Image hashes

MD5: e19e5469ed3a3d98b4ef0ceb048eeab6
SHA-1: 1ffd0a88e4d79e206ab1d41ba76d69b0fa8ec9f1
SHA-256: beb7ec4aeeabf8c3f2b94a6a8736665cf2c5053e41465b54e4a7c3d853cc8df3

PE image details

CLR assembly: Yes
Langauge*: Microsoft Visual C# / Basic .NET
File packed: No
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