Should I block it?

No, this file is 100% safe to run.

Additional versions

6.3.9600.16384 (winblue_rtm.130821-1623)	4.76%
6.3.9600.16384 (winblue_rtm.130821-1623)	0.11%
6.3.9431.0 (winmain_bluemp.130615-1214)	0.30%
6.3.9431.0 (winmain_bluemp.130615-1214)	0.03%
6.2.9200.16384 (win8_rtm.120725-1247)	2.67%
6.2.9200.16384 (win8_rtm.120725-1247)	12.52%
6.2.8400.0 (winmain_win8rc.120518-1423)	0.05%
6.2.8400.0 (winmain_win8rc.120518-1423)	0.05%
6.2.8250.0 (winmain_win8beta.120217-1520)	0.03%
6.2.8102.0 (winmain_win8m3.110823-1455)	0.05%
6.1.7600.16385 (win7_rtm.090713-1255)	18.39%
6.1.7600.16385 (win7_rtm.090713-1255)	32.98%
6.1.7600.16385 (win7_rtm.090713-1255)	0.03%
6.1.7600.16384 (win7_rtm.090710-1945)	0.03%
6.0.6000.16386 (vista_rtm.061101-2205)	5.71%
6.0.6000.16386 (vista_rtm.061101-2205)	0.84%
5.2.3790.3959 (srv03_sp2_rtm.070216-1710)	0.03%
5.2.3790.3959 (srv03_sp2_rtm.070216-1710)	0.05%
5.1.2600.5512 (xpsp.080413-2108)	14.12%
5.1.2600.5512 (xpsp.080413-2108)	0.95%
5.1.2600.5512 (xpsp.080413-2108)	0.68%
5.1.2600.5512 (xpsp.080413-2108)	0.08%
5.1.2600.5512 (xpsp.080413-2108)	0.65%
5.1.2600.5512 (xpsp.080413-2108)	0.03%
5.1.2600.5512 (xpsp.080413-2108)	0.03%
View more
5.1.2600.5512 (xpsp.080413-2108)	0.46%
5.1.2600.5512 (xpsp.080413-2108)	0.08%
5.1.2600.5512 (xpsp.080413-2108)	0.03%
5.1.2600.5512 (xpsp.080413-2108)	0.16%
5.1.2600.5512 (xpsp.080413-2108)	0.30%
5.1.2600.5512 (xpsp.080413-2108)	0.33%
5.1.2600.5512 (xpsp.080413-2108)	0.03%
5.1.2600.5512 (xpsp.080413-2108)	0.08%
5.1.2600.5512 (xpsp.080413-2108)	0.03%
5.1.2600.5512 (xpsp.080413-2108)	0.03%
5.1.2600.5512 (xpsp.080413-2108)	0.03%
5.1.2600.5512 (xpsp.080413-2108)	0.03%
5.1.2600.3311 (xpsp.080212-0003)	0.08%
5.1.2600.3300 (xpsp.080125-2027)	0.03%
5.1.2600.3244 (xpsp.071030-1534)	0.03%
5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)	2.86%
5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)	0.08%
5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)	0.03%
5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)	0.03%
5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)	0.03%
5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)	0.03%
5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)	0.03%
5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)	0.03%

Relationships

wshost.exe (COM Surrogate by Microsoft Corporation)

PE file structure

Show functions

Import table

api-ms-win-core-com-l1-1-0.dll

IIDFromString, CoInitializeEx, CoUninitialize

api-ms-win-core-com-l1-1-1.dll

IIDFromString, CoInitializeEx, CoUninitialize

api-ms-win-core-com-private-l1-1-0.dll

CoRegisterSurrogateEx

api-ms-win-core-errorhandling-l1-1-1.dll

UnhandledExceptionFilter, SetUnhandledExceptionFilter

api-ms-win-core-heap-l1-2-0.dll

HeapSetInformation

api-ms-win-core-interlocked-l1-2-0.dll

InterlockedExchange, InterlockedCompareExchange

api-ms-win-core-libraryloader-l1-1-1.dll

GetModuleHandleA

api-ms-win-core-processthreads-l1-1-1.dll

GetStartupInfoW, TerminateProcess, GetCurrentThreadId, GetCurrentProcessId, GetCurrentProcess

api-ms-win-core-processthreads-l1-1-2.dll

TerminateProcess, GetCurrentProcess, GetStartupInfoW, GetCurrentProcessId, GetCurrentThreadId

api-ms-win-core-profile-l1-1-0.dll

QueryPerformanceCounter

api-ms-win-core-synch-l1-2-0.dll

Sleep

api-ms-win-core-sysinfo-l1-2-0.dll

GetTickCount, GetSystemTimeAsFileTime

api-ms-win-core-sysinfo-l1-2-1.dll

GetTickCount, GetSystemTimeAsFileTime

kernel32.dll

TerminateProcess, GetCurrentProcess, HeapSetInformation, GetSystemTimeAsFileTime, GetCurrentProcessId, GetCurrentThreadId, GetTickCount, QueryPerformanceCounter, GetModuleHandleA, SetUnhandledExceptionFilter, GetStartupInfoW, InterlockedCompareExchange, Sleep, InterlockedExchange, UnhandledExceptionFilter, lstrlenA, GetVersionExW, SetEnvironmentVariableW, MultiByteToWideChar, GetStartupInfoA, lstrcmpiA

msvcrt.dll

DllMain

ntdll.dll

NtSetInformationProcess

ole32.dll

CoInitializeEx, CoRegisterSurrogateEx, CoUninitialize, CLSIDFromString

dllhost.exe

COM Surrogate by Microsoft Corporation (Signed)

Remove dllhost.exe

Version:	5.1.2600.5512 (xpsp.080413-2108)
MD5:	0dad93bb0fecf5016ae3c06cbb0a873b
SHA1:	1072be61175e9790cc5f2b5607ddb061000fce7d
SHA256:	533a56f0e660c26d4fc027287521c20f12a180e1026638552509f6c36fe6d987

This is a Windows system installed file with Windows File Protection (WFP) enabled.

What is dllhost.exe?

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.

Overview

dllhost.exe runs as a service under the name Aplikacja systemowa modelu COM+ (COMSysApp) within the local user context. The file is digitally signed by Microsoft Corporation. This version is installed on Windows XP and is compiled as a 32 bit program.

Details

File name:	dllhost.exe
Publisher:	Microsoft Corporation
Product name:	COM Surrogate
Description:	Microsoft® Windows® Operating System
Typical file path:	C:\Windows\System32\dllhost.exe
File version:	5.1.2600.5512 (xpsp.080413-2108)
Product version:	5.1.2600.5512
Size:	5 KB (5,120 bytes)
Certificate
Issued to:	Microsoft Corporation
Authority (CA):	Microsoft Corporation
Expiration date:	Tuesday, July 9, 2013
Digital DNA
PE subsystem:	Windows GUI
Entropy:	4.980855
File packed:	No
Code language:	Microsoft Visual C++
.NET CLR:	No

More details

Behaviors

Services

Runs under 'SYSTEM\CurrentControlSet\Services' by the Service Controller (services.exe)

'COMSysApp' (Aplikacja systemowa modelu COM+)
'PrlVssProvider'
Symantec SymSnap VSS Provider
'COMSysApp'

Resource utilization

(Note: statistics below are averages based on a minimum sample size of 200 unique participants)

Averages

CPU
Total CPU:	0.03217928%	0.028634%
Kernel CPU:	0.02505387%	0.013761%
User CPU:	0.00712541%	0.014873%
Kernel CPU time:	21,875 ms/min	100,923,805ms/min
Memory
Private memory:	2.65 MB	21.59 MB
Private (maximum):	4.28 MB
Private (minimum):	716 KB
Non-paged memory:	2.65 MB	21.59 MB
Virtual memory:	37.62 MB	140.96 MB
Virtual memory (peak):	39.12 MB	169.69 MB
Working set:	1.38 MB	18.61 MB
Working set (peak):	4.28 MB	37.95 MB
Resource allocations
Threads:	4	12
Handles:	122	600
GUI GDI count:	9	103
GUI USER count:	1	49

Process properties

Integrety level:	Undefined
Platform:	32-bit
Command line:	C:\Windows\System32\dllhost.exe /processiC:{b366debe-645b-43a5-b865-ddd82c345492}
Owner:	User
Windows Service
Service name:	COMSysApp
Display name:	Aplikacja systemowa modelu COM+
Description:	“Administra la configuración y el seguimiento de los componentes del Modelo de objetos componentes (COM+). Si se detiene el servicio, la mayoría de los componentes COM+ no funcionarán correctamente. Si se deshabilita este servicio, no se podrá iniciar ningún servicio que dependa específicamente de él.”
Type:	Win32OwnProcess
Parent process:	svchost.exe (Generic Host Process for Win32 Services by Microsoft)

Distribution by Windows OS

OS version	distribution
Windows 7 Home Premium	34.00%
Windows 8.1	19.00%
Windows 8.1 Pro	10.00%
Windows 7 Ultimate	9.50%
Windows 8.1 Single Language	7.00%
Windows 7 Professional	5.00%
Windows 8 Single Language	3.50%
Windows 8	3.00%
Windows 8 Pro	3.00%
Windows 8.1 Pro with Media Center	2.00%
Windows Seven Black Edition	1.00%
Windows Vista Home Premium	1.00%
Windows 8.1 N	0.50%
Windows 8 Enterprise N	0.50%
Windows 7 Home Basic	0.50%
Windows 8.1 Enterprise Evaluation	0.50%

Distribution by country

United States installs about 50.51% of COM Surrogate.

Distribution by PC manufacturer

PC Manufacturer	distribution
Dell	23.17%
Hewlett-Packard	17.37%
ASUS	13.90%
Acer	11.20%
Toshiba	10.04%
Lenovo	10.04%
Sony	7.72%
Alienware	2.70%
Intel	1.54%
Samsung	1.16%
GIGABYTE	1.16%

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