How to Apply the Windows Update that Patches the EternalBlue SMB Exploit

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The first step in protecting any computer against WannaCry, Uiwix and other ransomware campaigns is to apply the critical patch that Microsoft released in March 2017 (Microsoft Security Bulletin MS17-010).

Step 1: Check this list to see if your system is exposed

This is the list of Windows software which need the update in order to close the vulnerabilities in SMBv1 and SMBv2:

  • Microsoft Windows Vista SP2
  • Microsoft Windows Server 2008 SP2 and R2 SP1
  • Microsoft Windows 7
  • Microsoft Windows 10
  • Microsoft Windows 8.1
  • Microsoft Windows RT 8.1
  • Microsoft Windows Server 2012 și R2
  • Microsoft Windows Server 2016
  • Microsoft Windows XP
  • Microsoft Windows Server 2003.

Step 2: Download and install the update

In order to counteract the limit the widespread threat that WannaCry and Uiwix are posing, Microsoft released new Security Updates packages so that all systems will be protected against the exploit, including unsupported systems, such as Windows XP or Windows Vista.

We’ve chosen to illustrate each step by using the update for Windows 7, since it’s the operating system with the highest number of users at the moment.

  1. Go to the Microsoft Security bulletin where you’ll find links to all the links for the security update packages.
  2. Scroll down to the operating system that you are using. In our example, it was Windows 7 64bits.
  3. Click on the package you need. In our example, we used Windows 7 for x64-based Systems Service Pack 1 (4012215) Monthly Rollup. Make sure it’s the Monthly Rollup link that you choose!
  4. windows patch guide wannacry ransomware step (1)

  5.  A new window will open. Select the update for the windows version that you have and press Download.
  6. windows patch guide wannacry ransomware step (2)

  7. Click on the link that will appear after you press the Download button:
  8. windows patch guide wannacry ransomware step (3)

  9. After the download is complete, run it as you would run any other setup.
  10. It will ask you if you want to install the Windows software update. Press Yes and this will initialize the installation setup:
  11. windows patch guide wannacry ransomware step (4)

    windows patch guide wannacry ransomware step (5)

  12. At the end of the installation it will ask you to restart the computer. Restart it.
  13. To check if the installation was successful, you can go to Control Panel > Windows Updates > View update History (on the left side) and see if the Security Update for Windows is installed. It should have the current date in the Date Installed column.

windows patch guide wannacry ransomware step (6)


If the update has already been applied or installed, then you will receive a message informing you about it.

windows patch guide wannacry ransomware step (7)

Also, make sure you follow the security alerts for WannaCry ransomware attacks and the Uiwix ransomware threat. We will keep these alerts updated at all times.

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About Heimdal Security
We protect users and companies from cyber-criminal actions, by keeping confidential information and intellectual property safe. We build products focused on proactive cyber security and we dedicate a big part of our efforts to cyber security education for everyone.
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