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What is dllhost.exe?

Part of COM Surrogate by Microsoft

What is it?

The COM Surrogate is a fancy name for Sacrificial process for a COM object that is run outside of the process that requested it. Explorer uses the COM Surrogate when extracting thumbnails, for example. If you go to a folder with thumbnails enabled, Explorer will fire off a COM Surrogate and use it to compute the thumbnails for the documents in the folder. It does this because Explorer has learned not to trust thumbnail extractors; they have a poor track record for stability.
(dllhost.exe is a system file that is installed with Windows)
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How does dllhost.exe run?

Service - dllhost.exe runs as a background Windows service called 'COMSysApp' (Aplikacja systemowa modelu COM+). This is a system service that is installed with the Windows operating system and protected with Window's File Protection.


What is the community is seeing?What is the community is doing?
About 0.1% of all Boost users have the dllhost.exe process running.Of the 0.1% of dllhost.exe users, less than 1% have disabled it.
How resource intensive is dllhost.exe?
Comparison based on the average resource utilization across all programs.
0.02747% CPU274662.5%
Average CPU utilization across all programs is 0.00001%.
          3.82 MB RAM17.8%
Average private memory utilization across all programs is 21.53 MB.
 12 /min0.5%
Average I/O read and write operations for all programs is 2,253 per minute.
         4 GDI objects2.7%
Average number of GUI GDI and USER objects for all programs is 150.
     7 context switches/sec7.0%
Average context switches for all programs is 100 per second.
Typical file (disk image) location:

Are there other versions of COM Surrogate?

What else is related?

What Windows OS versions does this run on?

Microsoft Windows XP (5.1.2600.196608)

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: dllhost.exe
Publisher: Microsoft Corporation (verified)
Name: COM Surrogate
Description: Microsoft® Windows® Operating System
Version: 5.1.2600.5512 (xpsp.080413-2108)
Product version: 5.1.2600.5512
Size: 5 KB
Original file name: dllhost.exe
Windows file protection: Yes

Digital certificate

Certificate authority: Microsoft Corporation
Expiration date: 7/9/2013

Resource utilization

CPU utilization averages
Total CPU: 0.0454132916%
Privileged CPU: 0.0179470418%
User CPU: 0.02746624982237%
Privileged CPU time: 296875 ms
Privileged CPU time /min: 777 ms
Context switches /sec: 7
Memory utilization averages
Committed memory: 47.46 MB
Peak committed memory: 49.08 MB
Paged memory: 3.82 MB
Peak paged memory: 4.04 MB
Paged system memory: 45.15 KB
Non-paged system memory: 6.09 KB
Working set memory: 5.29 MB
Peak working set memory: 9.09 MB
Min working set memory: 5.12 MB
Private memory: 3.82 MB
Page faults: 2,575
Page faults /min: 7
Process I/O averages
Total read operations: 4,288
Read operations /min: 11
Total read transfer: 2.64 MB
Read transfer /min: 7.06 KB
Total write operations: 57
Write operations /min: 1
Total write transfer: 146.15 KB
Write transfer /min: 391 Bytes
Total other operations: 1,434
Other operations /min: 4
Total other transfer: 21.93 KB
Other Transfer /min: 59 Bytes
GUI Object Averages
GDI objects: 4
USER objects: 1
Handle count average: 288
Thread count average: 18

Process details

Runs as (owner): User
Integrety level: Undefined
Windows platform: 32-bit
Runs as a service: Yes
Parent Process
Process Command
C:\WINDOWS\system32\dllhost.exe /ProcessiC:{02D4B3F1-FD88-11D1-960D-00805FC79235}

Service details

Name: Aplikacja systemowa modelu COM+
Service name: COMSysApp
Service type: Win32OwnProcess
Description: “Zarządza konfiguracją i śledzeniem składników opartych na modelu Component Object Model (COM)+. Jeżeli usługa zostanie zatrzymana, większość składników opartych na modelu COM+ nie będzie działać właściwie. Jeżeli usługa ta zostanie wyłączona, wszystkie usługi od niej zależne nie będą mogły zostać uruchomione.”

Image hashes

MD5: edd19f93679c098429160c8866e8b1c2
SHA-1: 3121681dd1529b0ff71e8621bbd1d6fc3c231f72

PE image details

Subsystem: Windows GUI
Langauge*: Microsoft Visual C++
File entropy: 4.98085
File packed: No
Import Table
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