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What is MsMpEng.exe?

Part of Microsoft Malware Protection by Microsoft

What is it?

MsMpEng.exe is the back-end of Microsoft Security Essentials. It is important to remember that this process is actually used by both Windows Defender and MSE. When you install Microsoft Security Essentials, then Windows Defender is automatically turned off and Microsoft Security Essentials uses this process. This is the main process that runs the program and takes quite some system memory. If you end this process then Microsoft Security Essentials will be disabled and an alert will be shown aski

What if I disable Microsoft Malware Protection?

If you disable Microsoft Security Essentials, then Windows Defender will be enabled and will start using this process. So in a way both Windows Defender and Microsoft Security Essentials use this single process.
Description of msmpeng.exe from Microsoft
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 spyware from your computer. Windows Defender features Real-Time Protection, a monitoring system that recommends actions against spyware when it's detected, minimizes interruptions, and helps you stay productive.
Download Boost (100% FREE) Speed up Microsoft Malware Protection and optimize your PC.

How does msmpeng.exe run?

Service - MsMpEng.exe runs as a background Windows service called 'WinDefend' (Служба Защитника Windows). This service runs as the SYSTEM account with extensive privileges on the local computer, and acts as the computer on the network. Служба Защитника Windows runs as a program that can be started by the Service Controller and that obeys the service control protocol. This type of service runs in a process by itself.


What is the community is seeing?What is the community is doing?
About 0.2% of all Boost users have the msmpeng.exe process running.Of the 0.2% of msmpeng.exe users, 25.0% have disabled it.
How resource intensive is MsMpEng.exe?
Comparison based on the average resource utilization across all programs.
0.00514% CPU51358.0%
Average CPU utilization across all programs is 0.00001%.
81.8 MB RAM379.9%
Average private memory utilization across all programs is 21.53 MB.
          369 /min16.4%
Average I/O read and write operations for all programs is 2,253 per minute.
57 context switches/sec57.0%
Average context switches for all programs is 100 per second.
Typical file (disk image) location:
C:\Program Files\microsoft security essentials\msmpeng.exe

Are there other versions of Microsoft Malware Protection?

What else is related?

What Windows OS versions does this run on?

Windows 7 Home Premium (6.1.7601.65536)
Windows 7 Professional (6.1.7601.65536)
Windows 7 Ultimate (6.1.7601.65536)

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: MsMpEng.exe
Publisher: Microsoft Corporation (verified)
Name: Microsoft Malware Protection
Description: AntiMalware Service Executable
Version: 4.5.0216.0
Size: 23.25 KB
Original file name: MsMpEng.exe

Digital certificate

Certificate authority: Microsoft Corporation
Effective date: 10/22/2008
Expiration date: 1/22/2010

Resource utilization

CPU utilization averages
Total CPU: 0.0177294445%
Privileged CPU: 0.0125936433%
User CPU: 0.00513580120240%
Privileged CPU time: 984679147.47 ms
Privileged CPU time /min: 81 ms
CPU cycle count: 897,797,619
CPU cycle count /min: 138,843,438
Context switches /sec: 57
Memory utilization averages
Committed memory: 265.23 MB
Peak committed memory: 590.82 MB
Paged memory: 81.8 MB
Peak paged memory: 398.78 MB
Paged system memory: 309.48 KB
Non-paged system memory: 53.98 KB
Working set memory: 52.15 MB
Peak working set memory: 372.2 MB
Min working set memory: 36.57 MB
Private memory: 81.8 MB
Page faults: 14,334,333
Page faults /min: 8,346
Process I/O averages
Total read operations: 2,870,707
Read operations /min: 363
Total read transfer: 426.06 MB
Read transfer /min: 14.85 MB
Total write operations: 777,233
Write operations /min: 6
Total write transfer: 489.34 MB
Write transfer /min: 103.07 KB
Total other operations: 11,419,684
Other operations /min: 8,720
Total other transfer: 226.46 MB
Other Transfer /min: 106.57 KB
Handle count average: 512
Thread count average: 29
Thread resource averages

Process details

Runs as (owner): System
Integrety level: System
Windows platform: 64-bit
Runs as a service: Yes
Parent Process
Child Process
Process Commands
"C:\Program Files\Microsoft Security Client\MsMpEng.exe"
"C:\Program Files\Microsoft Security Client\MsMpEng.exe"

Service details

Name: Служба Защитника Windows
Service name: WinDefend
Service type: Win32OwnProcess
Description: “Позволяет пользователям защититься от вредоносных и иных потенциально нежелательных программ”

Image hashes

MD5: 89f2aedc2788696702141ab82c3e7866
SHA-1: c894455b32298caff66eef7cceff2c89f0db3448

PE image details

Subsystem: Windows GUI
Langauge*: Microsoft Visual C++
File entropy: 6.37260
File packed: No
Import Table
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