TiWorker.exe and TrustedInstaller.exe not signed on Windows 8.1 Pro
I am running Windows 8.1 on a Surface Pro tablet, all up to date. All Microsoft files in the system are digitally signed except the following two files.
TrustedInstaller.exe, Version 6.3.9600.16384 dated 22-Aug-2013, size 98,816 bytes
TiWorker.exe, Version 6.3.9600.16384 dated 22-Aug-2013, size 190,464 bytes
Why would Microsoft not sign these files?
John
Hi,
I am not sure which way you use to check the digital signature of these files, but I get the signature of these files as below by using sigcheck tool:
Sigcheck v2.01
http://technet.microsoft.com/en-us/sysinternals/bb897441
E:\installer\Sigcheck>sigcheck -i C:\Windows\servicing\TrustedInstaller.exe
Sigcheck v2.01 - File version and signature viewer
Copyright (C) 2004-2013 Mark Russinovich
Sysinternals - www.sysinternals.com
c:\windows\servicing\TrustedInstaller.exe:
Verified: Signed
Catalog: C:\Windows\system32\CatRoot\{F750E6C3-38EE-11D1-85E5-00C
04FC295EE}\Package_8_for_KB2871777~31bf3856ad364e35~amd64~~6.2.1.3.cat
Signers:
Microsoft Windows
Status: Valid
Valid Usage: Code Signing, NT5 Crypto
Serial Number: 33 00 00 00 24 18 FC 0B 68 9E
73 99 D0 00 00 00 00 00 24
Thumbprint: 812705D0EDDCE07C8A1DCCD9DC6E50C5E3D19219
Algorithm: 1.2.840.113549.1.1.11
Valid from: 5:43 AM 6/18/2013
Valid to: 5:43 AM 9/18/2014
Microsoft Windows Production PCA 2011
Status: Valid
Valid Usage: All
Serial Number: 61 07 76 56 00 00 00 00 00 08
Thumbprint: 580A6F4CC4E4B669B9EBDC1B2B3E087B80D0678D
Algorithm: 1.2.840.113549.1.1.11
Valid from: 2:41 AM 10/20/2011
Valid to: 2:51 AM 10/20/2026
Microsoft Root Certificate Authority 2010
Status: Valid
Valid Usage: All
Serial Number: 28 CC 3A 25 BF BA 44 AC 44 9A
9B 58 6B 43 39 AA
Thumbprint: 3B1EFD3A66EA28B16697394703A72CA340A05BD5
Algorithm: 1.2.840.113549.1.1.11
Valid from: 5:57 AM 6/24/2010
Valid to: 6:04 AM 6/24/2035
Signing date: 7:29 AM 8/8/2013
Counter Signers:
Microsoft Time-Stamp Service
Status: Valid
Valid Usage: Timestamp Signing
Serial Number: 33 00 00 00 2C D7 29 77 3B 67
CC 1B C6 00 00 00 00 00 2C
Thumbprint: B23759FFE629396CFE7339AB4384EC36846A3A5A
Algorithm: 1.2.840.113549.1.1.11
Valid from: 4:13 AM 3/28/2013
Valid to: 4:13 AM 6/28/2014
Microsoft Time-Stamp PCA 2010
Status: Valid
Valid Usage: All
Serial Number: 61 09 81 2A 00 00 00 00 00 02
Thumbprint: 2AA752FE64C49ABE82913C463529CF10FF2F04EE
Algorithm: 1.2.840.113549.1.1.11
Valid from: 5:36 AM 7/2/2010
Valid to: 5:46 AM 7/2/2025
Microsoft Root Certificate Authority 2010
Status: Valid
Valid Usage: All
Serial Number: 28 CC 3A 25 BF BA 44 AC 44 9A
9B 58 6B 43 39 AA
Thumbprint: 3B1EFD3A66EA28B16697394703A72CA340A05BD5
Algorithm: 1.2.840.113549.1.1.11
Valid from: 5:57 AM 6/24/2010
Valid to: 6:04 AM 6/24/2035
Publisher: Microsoft Windows
Description: Windows Modules Installer
Product: Microsoft« Windows« Operating System
Prod version: 6.2.9200.16384
File version: 6.2.9200.16384 (win8_rtm.120725-1247)
MachineType: 64-bit
E:\installer\Sigcheck>sigcheck -i C:\Windows\WinSxS\amd64_microsoft-windows-serv
icingstack_31bf3856ad364e35_6.2.9200.16683_none_62280e15510f8e79\tiworker.exe
Sigcheck v2.01 - File version and signature viewer
Copyright (C) 2004-2013 Mark Russinovich
Sysinternals - www.sysinternals.com
c:\windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_6.2.92
00.16683_none_62280e15510f8e79\TiWorker.exe:
Verified: Signed
Catalog: C:\Windows\system32\CatRoot\{F750E6C3-38EE-11D1-85E5-00C
04FC295EE}\Package_10_for_KB2871777~31bf3856ad364e35~amd64~~6.2.1.3.cat
Signers:
Microsoft Windows
Status: Valid
Valid Usage: Code Signing, NT5 Crypto
Serial Number: 33 00 00 00 24 18 FC 0B 68 9E
73 99 D0 00 00 00 00 00 24
Thumbprint: 812705D0EDDCE07C8A1DCCD9DC6E50C5E3D19219
Algorithm: 1.2.840.113549.1.1.11
Valid from: 5:43 AM 6/18/2013
Valid to: 5:43 AM 9/18/2014
Microsoft Windows Production PCA 2011
Status: Valid
Valid Usage: All
Serial Number: 61 07 76 56 00 00 00 00 00 08
Thumbprint: 580A6F4CC4E4B669B9EBDC1B2B3E087B80D0678D
Algorithm: 1.2.840.113549.1.1.11
Valid from: 2:41 AM 10/20/2011
Valid to: 2:51 AM 10/20/2026
Microsoft Root Certificate Authority 2010
Status: Valid
Valid Usage: All
Serial Number: 28 CC 3A 25 BF BA 44 AC 44 9A
9B 58 6B 43 39 AA
Thumbprint: 3B1EFD3A66EA28B16697394703A72CA340A05BD5
Algorithm: 1.2.840.113549.1.1.11
Valid from: 5:57 AM 6/24/2010
Valid to: 6:04 AM 6/24/2035
Signing date: 7:29 AM 8/8/2013
Counter Signers:
Microsoft Time-Stamp Service
Status: Valid
Valid Usage: Timestamp Signing
Serial Number: 33 00 00 00 29 97 4E 7C 82 CB
20 16 41 00 00 00 00 00 29
Thumbprint: 74C2D86CBB54F52C6B69BC0A127F427EF60A8B8A
Algorithm: 1.2.840.113549.1.1.11
Valid from: 4:13 AM 3/28/2013
Valid to: 4:13 AM 6/28/2014
Microsoft Time-Stamp PCA 2010
Status: Valid
Valid Usage: All
Serial Number: 61 09 81 2A 00 00 00 00 00 02
Thumbprint: 2AA752FE64C49ABE82913C463529CF10FF2F04EE
Algorithm: 1.2.840.113549.1.1.11
Valid from: 5:36 AM 7/2/2010
Valid to: 5:46 AM 7/2/2025
Microsoft Root Certificate Authority 2010
Status: Valid
Valid Usage: All
Serial Number: 28 CC 3A 25 BF BA 44 AC 44 9A
9B 58 6B 43 39 AA
Thumbprint: 3B1EFD3A66EA28B16697394703A72CA340A05BD5
Algorithm: 1.2.840.113549.1.1.11
Valid from: 5:57 AM 6/24/2010
Valid to: 6:04 AM 6/24/2035
Publisher: Microsoft Windows
Description: Windows Modules Installer Worker
Product: Microsoft« Windows« Operating System
Prod version: 6.2.9200.16613
File version: 6.2.9200.16613 (win8_gdr.130515-1513)
MachineType: 64-bit
If you just check the properties of these files, you may not see that signed tab. Please know that when a file is signed via a security catalog file, the Digital Signatures tab is not displayed.
Kate Li
TechNet Community Support
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