Should I block it?

No, this file is 100% safe to run.

Additional versions

6.3.9600.16384 (winblue_rtm.130821-1623)	1.84%
6.3.9600.16384 (winblue_rtm.130821-1623)	0.09%
6.3.9600.16384 (winblue_rtm.130821-1623)	2.62%
6.3.9431.0 (winmain_bluemp.130615-1214)	0.28%
6.3.9431.0 (winmain_bluemp.130615-1214)	0.05%
6.2.9200.16384 (win8_rtm.120725-1247)	2.02%
6.2.9200.16384 (win8_rtm.120725-1247)	8.56%
6.2.9200.16384 (win8_rtm.120725-1247)	5.47%
6.2.9200.16384 (win8_rtm.120725-1247)	0.37%
6.2.8400.0 (winmain_win8rc.120518-1423)	0.09%
6.2.8400.0 (winmain_win8rc.120518-1423)	0.09%
6.2.8250.0 (winmain_win8beta.120217-1520)	0.05%
6.2.8102.0 (winmain_win8m3.110823-1455)	0.09%
6.1.7600.16385 (win7_rtm.090713-1255)	5.80%
6.1.7600.16385 (win7_rtm.090713-1255)	40.94%
6.1.7600.16385 (win7_rtm.090713-1255)	19.46%
6.1.7600.16385 (win7_rtm.090713-1255)	3.73%
6.1.7600.16385 (win7_rtm.090713-1255)	0.05%
6.1.7600.16384 (win7_rtm.090710-1945)	0.05%
6.0.6001.18000 (longhorn_rtm.080118-1840)	6.07%
6.0.6001.18000 (longhorn_rtm.080118-1840)	0.05%
6.0.6001.18000 (longhorn_rtm.080118-1840)	1.43%
6.0.6001.18000 (longhorn_rtm.080118-1840)	0.55%
6.0.6000.16386 (vista_rtm.061101-2205)	0.09%
6.0.6000.16386 (vista_rtm.061101-2205)	0.18%

Relationships

tiworker.exe (Windows Modules Installer Worker by Microsoft)

PE file structure

Show functions

Import table

advapi32.dll

SetServiceStatus, RegCloseKey, RegOpenKeyExW, RegisterServiceCtrlHandlerExW, StartServiceCtrlDispatcherW, OpenProcessToken, RegOpenKeyW, RegCreateKeyExW, RegDeleteKeyW, CloseServiceHandle, InitiateShutdownW, LookupPrivilegeValueW, AdjustTokenPrivileges, ChangeServiceConfigW, QueryServiceConfigW, OpenSCManagerW, OpenServiceW, RegQueryValueExW, RegEnumValueW, TraceMessage, GetTraceEnableFlags, GetTraceEnableLevel, GetTraceLoggerHandle, RegisterTraceGuidsW, UnregisterTraceGuids, CreateRestrictedToken, ConvertStringSidToSidW, CreateProcessAsUserW, RegSetValueExW, FreeSid, CheckTokenMembership, AllocateAndInitializeSid, OpenThreadToken, ImpersonateSelf, RevertToSelf, I_ScRegisterPreshutdownRestart

kernel32.dll

LoadLibraryW, GetSystemDirectoryW, GetTickCount, QueryPerformanceCounter, CreateDirectoryW, ExpandEnvironmentStringsW, GetFullPathNameW, GetFileAttributesExW, GetProcAddress, GetFileAttributesW, GetVersionExW, lstrlenW, GetEnvironmentVariableW, GetSystemTime, MoveFileExW, GetWindowsDirectoryW, CreateProcessW, CreateFileW, SetFileTime, GetExitCodeProcess, FindFirstFileW, CompareFileTime, FindNextFileW, DeleteFileW, FindClose, OutputDebugStringA, UnhandledExceptionFilter, TerminateProcess, GetModuleHandleA, SetUnhandledExceptionFilter, InterlockedCompareExchange, Sleep, GetSystemTimeAsFileTime, GetCurrentProcessId, FreeLibrary, GetCurrentProcess, GetModuleFileNameW, InterlockedDecrement, InterlockedIncrement, LeaveCriticalSection, TryEnterCriticalSection, EnterCriticalSection, InitializeCriticalSection, lstrcmpW, ExitProcess, HeapSetInformation, CreateEventW, GetLastError, CreateThread, WaitForMultipleObjects, TerminateThread, WaitForSingleObject, GetExitCodeThread, CloseHandle, SetEvent, InterlockedExchange, GetCurrentThreadId, LocalFree, GetCurrentThread, GetTempPathW, DeleteCriticalSection, FileTimeToSystemTime, FileTimeToLocalFileTime

msvcrt.dll

DllMain

ntdll.dll

NtQuerySystemInformation

ole32.dll

CoDisconnectContext, CoRevokeClassObject, CoSuspendClassObjects, CoCreateInstance, CoRegisterClassObject, CoInitializeSecurity, CoInitializeEx, CoGetMalloc, CoUninitialize, CoResumeClassObjects, CoRevertToSelf, CoImpersonateClient, CoGetCallContext, CoGetClassObject, CoGetInterfaceAndReleaseStream, CoMarshalInterThreadInterfaceInStream, CoTaskMemFree

user32.dll

GetSystemMetrics

trustedinstaller.exe

Windows Modules Installer by Microsoft

Remove trustedinstaller.exe

Version:	6.0.6001.18000 (longhorn_rtm.080118-1840)
MD5:	ac6ff1df22ed90bad6417ee5a4c6e2f0
SHA1:	2c2fd7cb41f892977880a386da2ce017eb74721d
SHA256:	b5114e2df7c1e994ea53b08f761dd5c84e1ee57b574c6adad103bec464887a4c

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

What is trustedinstaller.exe?

The Windows Modules Installer (trusted Installer) enables installation, modification, and removal of Windows updates and optional components.

Overview

trustedinstaller.exe runs as a service under the name Instalador de Módulos do Windows (TrustedInstaller) with extensive SYSTEM privileges (full administrator access). and is compiled as a 32 bit program.

Details

File name:	trustedinstaller.exe
Publisher:	Microsoft Corporation
Product name:	Windows Modules Installer
Description:	Microsoft® Windows® Operating System
Typical file path:	C:\windows\servicing\trustedinstaller.exe
Original name:	TrustedInstaller.exe.mui
File version:	6.0.6001.18000 (longhorn_rtm.080118-1840)
Product version:	6.0.6001.18000
Size:	41.5 KB (42,496 bytes)
Digital DNA
PE subsystem:	Windows GUI
Entropy:	6.353177
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)

'TrustedInstaller'

Resource utilization

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

Averages

CPU
Total CPU:	2.10841742%	0.028634%
Kernel CPU:	1.04157265%	0.013761%
User CPU:	1.06684477%	0.014873%
Kernel CPU time:	577 ms/min	100,923,805ms/min
Memory
Private memory:	31.14 MB	21.59 MB
Private (maximum):	34.57 MB
Private (minimum):	34.57 MB
Non-paged memory:	31.14 MB	21.59 MB
Virtual memory:	117.92 MB	140.96 MB
Virtual memory (peak):	122.86 MB	169.69 MB
Working set:	34.57 MB	18.61 MB
Working set (peak):	53.25 MB	37.95 MB
Resource allocations
Threads:	7	12
Handles:	243	600

Process properties

Platform:	32-bit
Command line:	C:\windows\servicing\trustedinstaller.exe
Owner:	SYSTEM
Windows Service
Service name:	TrustedInstaller
Display name:	Instalador de Módulos do Windows
Description:	“Proporciona instalação, modificação e remoção de atualizações e de componentes opcionais do Windows. Se esse serviço for desativado, a instalação e desinstalação de atualizações do Windows podem falhar no computador.”
Type:	Win32OwnProcess

Distribution by Windows OS

OS version	distribution
Windows 7 Home Premium	34.50%
Windows 8.1	17.50%
Windows 7 Ultimate	13.50%
Windows 8.1 Pro	7.50%
Windows 7 Professional	6.00%
Windows 8	3.50%
Windows 8.1 Single Language	3.50%
Windows 8 Pro	3.50%
Windows 8.1 Pro with Media Center	2.50%
Windows 8 Single Language	2.50%
Windows 7 Home Basic	2.00%
Windows 8 Enterprise N	1.00%
Windows 8.1 N	0.50%
Windows Seven Black Edition	0.50%
Windows 8.1 Enterprise Evaluation	0.50%
Windows Vista Home Premium	0.50%
Windows 8 Enterprise	0.50%

Distribution by country

United States installs about 43.72% of Windows Modules Installer.

Distribution by PC manufacturer

PC Manufacturer	distribution
ASUS	19.85%
Dell	17.56%
Hewlett-Packard	17.18%
Acer	12.98%
Toshiba	11.45%
Lenovo	8.40%
Sony	5.34%
Intel	3.05%
Samsung	1.53%
GIGABYTE	1.53%
Alienware	1.15%

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