Antivirus software doesn't check whether a file is digitally signed in Windows

Applies To
Windows 8.1 Enterprise Windows 8.1 Windows 8.1 Pro Windows RT 8.1 Windows Server 2012 R2 Datacenter Windows Server 2012 R2 Essentials Windows Server 2012 R2 Foundation Windows Server 2012 R2 Standard Windows 8 Enterprise Windows 8 Windows 8 Pro Windows 7 Service Pack 1 Windows 7 Enterprise Windows 7 Home Basic Windows 7 Home Premium Windows 7 Professional Windows 7 Starter Windows 7 Ultimate Windows Server 2008 R2 Service Pack 1 Windows Server 2008 R2 Enterprise Windows Server 2008 R2 Datacenter Windows Server 2008 R2 Foundation Windows Server 2008 R2 Standard Windows Server 2008 R2 for Itanium-Based Systems Windows Server 2008 R2 Web Edition

Symptoms

Consider the following scenario:

  • You have a computer that's running Windows 8.1, Windows Server 2012 R2, Windows 8, Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1.
  • You have antivirus software such as Kaspersky Antivirus software installed on the computer.
  • The antivirus software can check whether a file is digitally signed.
  • You receive a specifically crafted or damaged signed file through an email message, an Internet download, or by any other channel.

In this scenario, the antivirus program does not check whether the file is digitally signed, and then the program stops responding. After that, the computer is unprotected, and the antivirus software cannot be restarted, even manually.

Resolution

Hotfix information

A supported hotfix is available from Microsoft Support. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, go to the following Microsoft website:

http:⁠//support.microsoft.com/contactus/?ws=support Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must running one of the following operating systems:

  • Windows 8.1
  • Windows Server 2012 R2
  • Windows 8
  • Windows 7 SP1
  • Windows Server 2008 R2 SP1

For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.

File information

The English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows RT 8.1, Windows 8.1 and Windows Server 2012 R2 file information notes

Important Windows 8.1 hotfixes and Windows Server 2012 R2 hotfixes are included in the same packages. However, only "Windows 8.1" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 8.1" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version Product Milestone Service branch
    6.3.960 0.16 xxx Windows RT 8.1, Windows 8.1 and Windows Server 2012 R2 RTM GDR
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows RT 8.1, Windows 8.1 and Windows Server 2012 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For Windows RT 8.1

File name File version File size Date Time Platform
Wintrust.dll 6.3.9600.16425 227,760 10-Oct-2013 13:03 Not applicable

For all supported x86-based versions of Windows 8.1

File name File version File size Date Time Platform
Wintrust.dll 6.3.9600.16520 236,480 27-Jan-2014 22:11 x86

For all supported x64-based versions of Windows 8.1 and of Windows Server 2012 R2

File name File version File size Date Time Platform
Wintrust.dll 6.3.9600.16520 317,616 28-Jan-2014 00:17 x64

Windows 8 file information and notes

Important Windows 8 and Windows Server 2012 hotfixes are included in the same packages. However, only "Windows 8" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 8" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, milestone (RTM,SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    Version Product Milestone Service branch
    6.2.920 0.16 xxx Windows 8 RTM GDR
    6.2.920 0.20 xxx Windows 8 RTM LDR
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 8" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 8

File name File version File size Date Time Platform
Wintrust.dll 6.2.9200.16749 261,632 24-Oct-2013 04:06 x86
Wintrust.dll 6.2.9200.20859 265,728 23-Oct-2013 22:39 x86

For all supported x64-based versions of Windows 8

File name File version File size Date Time Platform
Wintrust.dll 6.2.9200.16749 337,408 24-Oct-2013 05:49 x64
Wintrust.dll 6.2.9200.20859 333,824 23-Oct-2013 22:33 x64
Wintrust.dll 6.2.9200.16749 261,632 24-Oct-2013 04:06 x86
Wintrust.dll 6.2.9200.20859 265,728 23-Oct-2013 22:39 x86

For all supported ARM-based versions of Windows 8

File name File version File size Date Time Platform
Wintrust.dll 6.2.9200.16749 221,184 24-Oct-2013 03:11 Not Applicable

Windows 7 and Windows Server 2008 R2 file information notes

Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version Product Milestone Service branch
    6.1.760 1.18xxx Windows 7 and Windows Server 2008 R2 SP1 GDR
    6.1.760 1.22xxx Windows 7 and Windows Server 2008 R2 SP1 LDR
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 7

File name File version File size Date Time Platform
Wintrust.dll 6.1.7601.18380 175,104 28-Jan-2014 02:07 x86
Wintrust.dll 6.1.7601.22583 175,104 28-Jan-2014 02:10 x86

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name File version File size Date Time Platform
Wintrust.dll 6.1.7601.18380 224,768 28-Jan-2014 02:32 x64
Wintrust.dll 6.1.7601.22583 224,768 28-Jan-2014 02:40 x64
Wintrust.dll 6.1.7601.18380 175,104 28-Jan-2014 02:07 x86
Wintrust.dll 6.1.7601.22583 175,104 28-Jan-2014 02:10 x86

For all supported IA-64-based versions of Windows Server 2008 R2

File name File version File size Date Time Platform
Wintrust.dll 6.1.7601.18380 500,736 28-Jan-2014 01:40 IA-64
Wintrust.dll 6.1.7601.22583 500,736 28-Jan-2014 01:56 IA-64
Wintrust.dll 6.1.7601.18380 175,104 28-Jan-2014 02:07 x86
Wintrust.dll 6.1.7601.22583 175,104 28-Jan-2014 02:10 x86

      

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Additional file information

Additional file information for Windows RT 8.1, Windows 8.1 and Windows Server 2012 R2

Additional files for Windows RT 8.1

File property Value
File name Arm_71ca390cd5623c018faf2f62cdbf6281_31bf3856ad364e35_6.3.9600.16519_none_9f8f8e8dccb2bc2b.manifest
File version Not applicable
File size 700
Date (UTC) 29-Jan-2014
Time (UTC) 06:37
Platform Not applicable
File name Arm_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.3.9600.16519_none_84a12556b56a4e71.manifest
File version Not applicable
File size 2,468
Date (UTC) 29-Jan-2014
Time (UTC) 06:37
Platform Not applicable
File name Update.mum
File version Not applicable
File size 2,000
Date (UTC) 29-Jan-2014
Time (UTC) 06:37
Platform Not applicable

Additional files for all supported x86-based versions of Windows 8.1

File property Value
File name Update.mum
File version Not applicable
File size 2,000
Date (UTC) 29-Jan-2014
Time (UTC) 06:14
Platform Not applicable
File name X86_e63f23b4ddfdb6dfb00d3b6867d5517c_31bf3856ad364e35_6.3.9600.16520_none_f017dcca61600c69.manifest
File version Not applicable
File size 700
Date (UTC) 29-Jan-2014
Time (UTC) 06:14
Platform Not applicable
File name X86_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.3.9600.16520_none_848ae078b57d678d.manifest
File version Not applicable
File size 2,465
Date (UTC) 27-Jan-2014
Time (UTC) 22:24
Platform Not applicable

Additional files for all supported x64-based versions of Windows 8.1 and of Windows Server 2012 R2

File property Value
File name Amd64_1be3e5cdfa7a7adfc58a3afd05f509ad_31bf3856ad364e35_6.3.9600.16520_none_5a2630e540086f55.manifest
File version Not applicable
File size 704
Date (UTC) 29-Jan-2014
Time (UTC) 06:18
Platform Not applicable
File name Amd64_e63f23b4ddfdb6dfb00d3b6867d5517c_31bf3856ad364e35_6.3.9600.16520_none_4c36784e19bd7d9f.manifest
File version Not applicable
File size 702
Date (UTC) 29-Jan-2014
Time (UTC) 06:18
Platform Not applicable
File name Amd64_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.3.9600.16520_none_e0a97bfc6ddad8c3.manifest
File version Not applicable
File size 2,467
Date (UTC) 28-Jan-2014
Time (UTC) 00:41
Platform Not applicable
File name Update.mum
File version Not applicable
File size 3,108
Date (UTC) 29-Jan-2014
Time (UTC) 06:18
Platform Not applicable
File name X86_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.3.9600.16520_none_848ae078b57d678d.manifest
File version Not applicable
File size 2,465
Date (UTC) 27-Jan-2014
Time (UTC) 22:24
Platform Not applicable

        
      

Additional file information for Windows 8

Additional files for all supported x86-based versions of Windows 8

File name X86_39c71790c2707a04d52cc9a6d5b9e041_31bf3856ad364e35_6.2.9200.20860_none_0ae0d9cb4d9927c6.manifest
File version Not Applicable
File size 700
Date (UTC) 24-Oct-2013
Time (UTC) 11:50
SHA-1 hash Not Applicable
MD5 hash Not Applicable
File name X86_ebb933153ab3adae9e43d4020c5c8607_31bf3856ad364e35_6.2.9200.16749_none_9d6dcfabf4850a3a.manifest
File version Not Applicable
File size 700
Date (UTC) 24-Oct-2013
Time (UTC) 11:50
SHA-1 hash Not Applicable
MD5 hash Not Applicable
File name X86_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.2.9200.16749_none_ec898e606b52ad4f.manifest
File version Not Applicable
File size 2,465
Date (UTC) 24-Oct-2013
Time (UTC) 04:46
SHA-1 hash Not Applicable
MD5 hash Not Applicable
File name X86_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.2.9200.20860_none_ecf488b98488a0ec.manifest
File version Not Applicable
File size 2,465
Date (UTC) 23-Oct-2013
Time (UTC) 23:15
SHA-1 hash Not Applicable
MD5 hash Not Applicable

Additional files for all supported x64-based versions of Windows 8

File name Amd64_01b90f40f6170c631181079d3d102147_31bf3856ad364e35_6.2.9200.20860_none_1f50e59e695026b1.manifest
File version Not Applicable
File size 704
Date (UTC) 24-Oct-2013
Time (UTC) 11:51
SHA-1 hash Not Applicable
MD5 hash Not Applicable
File name Amd64_39c71790c2707a04d52cc9a6d5b9e041_31bf3856ad364e35_6.2.9200.20860_none_66ff754f05f698fc.manifest
File version Not Applicable
File size 702
Date (UTC) 24-Oct-2013
Time (UTC) 11:51
SHA-1 hash Not Applicable
MD5 hash Not Applicable
File name Amd64_60a7c4c9d0c0284c439c37a8da3a6224_31bf3856ad364e35_6.2.9200.16749_none_6e6ef32c8ded68d5.manifest
File version Not Applicable
File size 1,048
Date (UTC) 24-Oct-2013
Time (UTC) 11:51
SHA-1 hash Not Applicable
MD5 hash Not Applicable
File name Amd64_bdb5d470219681a2edf2576d162fc11b_31bf3856ad364e35_6.2.9200.16749_none_8dc5de723aec921a.manifest
File version Not Applicable
File size 704
Date (UTC) 24-Oct-2013
Time (UTC) 11:51
SHA-1 hash Not Applicable
MD5 hash Not Applicable
File name Amd64_c72ac5d319828c3e19abe6ca88a8adfb_31bf3856ad364e35_6.2.9200.20860_none_1b094121b67a9031.manifest
File version Not Applicable
File size 1,048
Date (UTC) 24-Oct-2013
Time (UTC) 11:51
SHA-1 hash Not Applicable
MD5 hash Not Applicable
File name Amd64_ebb933153ab3adae9e43d4020c5c8607_31bf3856ad364e35_6.2.9200.16749_none_f98c6b2face27b70.manifest
File version Not Applicable
File size 702
Date (UTC) 24-Oct-2013
Time (UTC) 11:51
SHA-1 hash Not Applicable
MD5 hash Not Applicable
File name Amd64_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.2.9200.16749_none_48a829e423b01e85.manifest
File version Not Applicable
File size 2,467
Date (UTC) 24-Oct-2013
Time (UTC) 07:04
SHA-1 hash Not Applicable
MD5 hash Not Applicable
File name Amd64_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.2.9200.20860_none_4913243d3ce61222.manifest
File version Not Applicable
File size 2,467
Date (UTC) 24-Oct-2013
Time (UTC) 01:46
SHA-1 hash Not Applicable
MD5 hash Not Applicable
File name X86_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.2.9200.16749_none_ec898e606b52ad4f.manifest
File version Not Applicable
File size 2,465
Date (UTC) 24-Oct-2013
Time (UTC) 04:46
SHA-1 hash Not Applicable
MD5 hash Not Applicable
File name X86_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.2.9200.20860_none_ecf488b98488a0ec.manifest
File version Not Applicable
File size 2,465
Date (UTC) 23-Oct-2013
Time (UTC) 23:15
SHA-1 hash Not Applicable
MD5 hash Not Applicable

Additional files for all supported ARM-based versions of Windows 8

File name Arm_f3857e63cc7e6d0f5eb722235ce39e26_31bf3856ad364e35_6.2.9200.16749_none_ebff436683a0b3fc.manifest
File version Not Applicable
File size 700
Date (UTC) 24-Oct-2013
Time (UTC) 11:49
SHA-1 hash Not Applicable
MD5 hash Not Applicable
File name Arm_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.2.9200.16749_none_ec8c00b86b4fcc15.manifest
File version Not Applicable
File size 2,465
Date (UTC) 24-Oct-2013
Time (UTC) 06:39
SHA-1 hash Not Applicable
MD5 hash Not Applicable

        
      

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7

File property Value
File name Update.mum
File version Not applicable
File size 2,138
Date (UTC) 28-Jan-2014
Time (UTC) 07:10
Platform Not applicable
File name X86_231d569c2514accadf3d265e26ea1023_31bf3856ad364e35_6.1.7601.22583_none_ab0d57423308f63c.manifest
File version Not applicable
File size 700
Date (UTC) 28-Jan-2014
Time (UTC) 07:10
Platform Not applicable
File name X86_8cc8ccda27105cd7abbeaa93434c8b26_31bf3856ad364e35_6.1.7601.18380_none_0eb0162fa282296c.manifest
File version Not applicable
File size 700
Date (UTC) 28-Jan-2014
Time (UTC) 07:10
Platform Not applicable
File name X86_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.1.7601.18380_none_f165d880f88f7b9c.manifest
File version Not applicable
File size 2,426
Date (UTC) 28-Jan-2014
Time (UTC) 02:35
Platform Not applicable
File name X86_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.1.7601.22583_none_f1f2781011aa6492.manifest
File version Not applicable
File size 2,426
Date (UTC) 28-Jan-2014
Time (UTC) 02:39
Platform Not applicable

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File property Value
File name Amd64_0e4c0a4461db77abeb0c3069dc0e847c_31bf3856ad364e35_6.1.7601.22583_none_1ef6a8d275894f71.manifest
File version Not applicable
File size 1,048
Date (UTC) 28-Jan-2014
Time (UTC) 07:10
Platform Not applicable
File name Amd64_1c10e39c997fcac54e396e9655b06710_31bf3856ad364e35_6.1.7601.18380_none_00713d8267ec2339.manifest
File version Not applicable
File size 704
Date (UTC) 28-Jan-2014
Time (UTC) 07:10
Platform Not applicable
File name Amd64_231d569c2514accadf3d265e26ea1023_31bf3856ad364e35_6.1.7601.22583_none_072bf2c5eb666772.manifest
File version Not applicable
File size 702
Date (UTC) 28-Jan-2014
Time (UTC) 07:10
Platform Not applicable
File name Amd64_8cc8ccda27105cd7abbeaa93434c8b26_31bf3856ad364e35_6.1.7601.18380_none_6aceb1b35adf9aa2.manifest
File version Not applicable
File size 702
Date (UTC) 28-Jan-2014
Time (UTC) 07:10
Platform Not applicable
File name Amd64_a332ca0bae39b983d63480fd3e3d7e6a_31bf3856ad364e35_6.1.7601.18380_none_219a950070f28dc2.manifest
File version Not applicable
File size 1,048
Date (UTC) 28-Jan-2014
Time (UTC) 07:10
Platform Not applicable
File name Amd64_f63c52dc5507f032451a29d3c8c52954_31bf3856ad364e35_6.1.7601.22583_none_6c3d99b78631c742.manifest
File version Not applicable
File size 704
Date (UTC) 28-Jan-2014
Time (UTC) 07:10
Platform Not applicable
File name Amd64_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.1.7601.18380_none_4d847404b0ececd2.manifest
File version Not applicable
File size 2,428
Date (UTC) 28-Jan-2014
Time (UTC) 03:02
Platform Not applicable
File name Amd64_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.1.7601.22583_none_4e111393ca07d5c8.manifest
File version Not applicable
File size 2,428
Date (UTC) 28-Jan-2014
Time (UTC) 03:09
Platform Not applicable
File name Update.mum
File version Not applicable
File size 2,774
Date (UTC) 28-Jan-2014
Time (UTC) 07:10
Platform Not applicable
File name X86_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.1.7601.18380_none_f165d880f88f7b9c.manifest
File version Not applicable
File size 2,426
Date (UTC) 28-Jan-2014
Time (UTC) 02:35
Platform Not applicable
File name X86_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.1.7601.22583_none_f1f2781011aa6492.manifest
File version Not applicable
File size 2,426
Date (UTC) 28-Jan-2014
Time (UTC) 02:39
Platform Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File property Value
File name Ia64_551a091ba826b95f6e4fd3d62813096a_31bf3856ad364e35_6.1.7601.18380_none_abaac436592bca13.manifest
File version Not applicable
File size 1,046
Date (UTC) 28-Jan-2014
Time (UTC) 07:10
Platform Not applicable
File name Ia64_d952294fb9a83f37ad3e69b72e7af5e2_31bf3856ad364e35_6.1.7601.22583_none_840b0dfc138df1c8.manifest
File version Not applicable
File size 1,046
Date (UTC) 28-Jan-2014
Time (UTC) 07:10
Platform Not applicable
File name Ia64_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.1.7601.18380_none_f1677c76f88d8498.manifest
File version Not applicable
File size 2,427
Date (UTC) 28-Jan-2014
Time (UTC) 02:22
Platform Not applicable
File name Ia64_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.1.7601.22583_none_f1f41c0611a86d8e.manifest
File version Not applicable
File size 2,427
Date (UTC) 28-Jan-2014
Time (UTC) 02:27
Platform Not applicable
File name Update.mum
File version Not applicable
File size 1,447
Date (UTC) 28-Jan-2014
Time (UTC) 07:10
Platform Not applicable
File name X86_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.1.7601.18380_none_f165d880f88f7b9c.manifest
File version Not applicable
File size 2,426
Date (UTC) 28-Jan-2014
Time (UTC) 02:35
Platform Not applicable
File name X86_microsoft-windows-wintrust-dll_31bf3856ad364e35_6.1.7601.22583_none_f1f2781011aa6492.manifest
File version Not applicable
File size 2,426
Date (UTC) 28-Jan-2014
Time (UTC) 02:39
Platform Not applicable

      

References

Learn about the terminology Microsoft uses to describe software updates.

Third-party information disclaimer

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.