Summary
Microsoft has released a Microsoft security advisory about this issue for IT professionals. The security advisory contains additional security-related information. To learn more about the vulnerability, see https://technet.microsoft.com/security/advisory/3074162
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Important
- All future security and non-security updates for Windows 8.1 and Windows Server 2012 R2 require update 2919355 to be installed. We recommend that you install update 2919355 on your Windows 8.1-based or Windows Server 2012 R2-based computer so that you receive future updates.
- If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.
For more information about the Malicious Software Removal Tool (MSRT), click the following article number to view the article in the Microsoft Knowledge Base:
890830 The Microsoft Windows Malicious Software Removal Tool helps remove specific, prevalent malicious software from computers that are running supported versions of Windows
How to obtain and install the update
Method 1: Windows Update
This update is available through Windows Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to turn on automatic updating, see
Get security updates automatically.
Method 2: Microsoft Download Center
You can obtain the stand-alone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update. Click the following link to download the file for all Windows versions:
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File hash information
| File name | SHA1 hash | SHA256 hash |
|---|---|---|
| Windows-KB890830-V5.26.exe | 2731AD858C623A9772244B0838ED7F3F212A6B9D | 05B6F1BF69760E73AC5FB760D217B8F484F20C9209667AD2CC01D0850528042F |
| Windows-KB890830-x64-V5.26.exe | 580E9F53164AE0852F5414DADFB22A6C2B03C911 | 9C12D0F141C8142AA3EF5E6D06AE4D608B4F1354A533C36559D0F72D354A7C7D |
File information
The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.
For all supported x64-based systems
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Mrt.exe | 5.26.11603.0 | 130,666,664 | 02-Jul-2015 | 04:00 | x64 |
| Mrtstub.exe | 5.26.11603.0 | 93,920 | 02-Jul-2015 | 03:46 | x64 |
For all supported x86-based systems
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Mrt.exe | 5.26.11603.0 | 127,403,696 | 02-Jul-2015 | 03:51 | x86 |
| Mrtstub.exe | 5.26.11603.0 | 89,816 | 02-Jul-2015 | 03:49 | x86 |
How to obtain help and support for this security update
Help for installing updates: Support for Microsoft Update
Security solutions for IT professionals: TechNet Security Troubleshooting and Support
Help for protecting your Windows-based computer from viruses and malware: Virus Solution and Security Center
Local support according to your country: International Support