Check if all systems have the WannaCry related Hotfixes installed - Based upon several requests, I also published a small tool on GitHub https://github.com/jhochwald/who_needs_wannacry_patches

who_needs_wannacry_patches.ps1

#requires -Version 2.0 -Modules ActiveDirectory

<#
		.SYNOPSIS
		Check if all systems have the WannaCry related Hotfixes installed
	
		.DESCRIPTION
		Check if all systems have the WannaCry related Hotfixes installed.
		Checks given Computers, or all server systems found in the Active Directory (default)
	
		.PARAMETER ComputerList
		Name, or list of computers to check
	
		.EXAMPLE
		# Check if WindowsServer1 have all WannaCry related hotfixes installed
		PS C:\> .\who_needs_wannacry_patches.ps1 -ComputerList 'WindowsServer1'

		.EXAMPLE
		# Check if WindowsServer1 and WinDC01 have all WannaCry related hotfixes installed
		# In this example the Server WinDC01 is unreachable.
		PS C:\> .\who_needs_wannacry_patches.ps1 -ComputerList 'WindowsServer1','WinDC01'

		WARNING: WinDC01 is offline or unreachable.

		.EXAMPLE
		# Check all systems found in the Active Directory have all WannaCry related hotfixes installed
		# In this example the System ZRHW10VM01 is missing some of the WannaCry hotfixes
		PS C:\> .\who_needs_wannacry_patches.ps1

		WARNING: ZRHW10VM01 is missing WannaCry hotfix
	
		.NOTES
		Advice:
		You need to review and tweak the Filter in Line 76
		Please note, that the WannaCry problem doesn't apply to Windows 10 (Just in case you change the filter to clients)

		History:
		2017-05-15 - Add the following KB4015549, KB4015552, KB4015553, and KB4019264
		2017-05-15 - Another tweak to the Filter (Line 76) to avoid Windows 10 but covers all other Windows OSes
		2017-05-15 - The newer version contains a fixed KB List / Removed the Signature
		2017-05-12 - Inital Version WannaCry

		License:
		Public Domain

		General:
		The code is provided 'as is,' with all possible faults, defects or errors, and without warranty of any kind.

		.LINKS
		https://technet.microsoft.com/en-us/library/security/ms17-010.aspx
		https://hochwald.net/check-wannacry-related-hotfixes-installed/
#>
param
(
	[Parameter(ValueFromPipeline = $true,
			ValueFromPipelineByPropertyName = $true,
	Position = 1)]
	[string[]]
	$ComputerList
)

begin {
	# List of fixes we search for, in this case all fixes relates to WannaCry
	# Source List: https://technet.microsoft.com/en-us/library/security/ms17-010.aspx and feedback
	$hotfixes = 'KB4012212', 'KB4012213', 'KB4012214', 'KB4012215', 'KB4012216', 'KB4012217', 'KB4012598', 'KB4012606', 'KB4013198', 'KB4013429', 'KB4015217', 'KB4015438', 'KB4015549', 'KB4015550', 'KB4015551', 'KB4015552', 'KB4015553', 'KB4016635', 'KB4019215', 'KB4019216', 'KB4019264', 'KB4019472'
}

process {

	if (-not ($ComputerList))
	{
		try 
		{
			# Filter for all Windows Systems, ignore our Mac's an Windows 10
			$ComputerList = Get-ADComputer -Filter {
				(OperatingSystem  -Like 'Windows*') -and (OperatingSystem -notlike '*Windows 10*')
			} | Select-Object -ExpandProperty 'Name'
		}
		catch 
		{
			Write-Error -Message 'Unable to get the List of computers from the Active Directory' -ErrorAction Stop
		}
	}

	# Loop over the List of computers
	foreach($computer in $ComputerList) 
	{
		if(-not(Test-Connection -ComputerName $computer -Count 1 -Quiet)) 
		{
			Write-Verbose "$computer is possibly offline or unreachable (Try anyway)."
		}

		try 
		{
			$hotfix = Get-HotFix -ComputerName $computer | 
			Where-Object -FilterScript {
				$hotfixes -contains $_.HotfixID
			} | 
			Select-Object -ExpandProperty 'HotFixID'

			if($hotfix) 
			{
				Write-Verbose -Message "$computer has hotfix $hotfix installed"
			}
			else 
			{
				Write-Warning -Message "$computer is missing WannaCry hotfix"
				continue
			}
		}
		catch 
		{
			Write-Warning -Message "Unable to get Hostfix Info from $computer"
			continue
		}
	}
}

<#
		I removed the signature to make it easier for others to adopt it (e.g. Tweak or changes)
		If you need a signed version, just drop me a line and I can sign one for you.

		NOTE: If you change something, upload it as Gist to GitHub and send me the link.

		And yes, I'll sign the script for free! Why not? (Before you ask!)
#>

Thanks for this.

There is also a (freeware) version as a UI based tool available on Github.

There are a few known issues:

• Test-Connection mark some systems as down, even if they are not!
• The Array (Line 46) doesn't work on all systems. Some OS Versions do not need all of them

I will pushlisuh an updated Version (with a bit more testing an logic) soon.

There is also a (freeware) version as a UI based tool available on Github.

New Version:

• The newer version contains a fixed KB List
• Check will run, even if the Test-Connection failed. Some had issues with that!
• Removed the Signature

There is also a (freeware) version as a UI based tool available on Github.

I removed the signature to make it easier for others to adopt it (e.g. Tweak or changes)
If you need a signed version, just drop me a line and I can sign one for you. (yep, for free!)
NOTE: If you change something, upload it as Gist to GitHub and send me the link.

There is also a (freeware) version as a UI based tool available on Github.

Update to Filter:

• Another tweak to the Filter (Line 75) to avoid Windows 10 but covers all other Windows OSes

There is also a (freeware) version as a UI based tool available on Github.

KB List update:

• Add the following KB4015549, KB4015552, KB4015553, and KB4019264

Write-Verbose -Message "$computer has hotfix $hotfix installed" doesn't seem to be working. It just skips the list of systems.

There is also a (freeware) version as a UI based tool available on Github.

to prevent further questions:
if you see something like this: WARNING: Unable to get Hostfix Info from HOSTNAME, please check that remote administration is enabled for the host that you use to run the script!

There is also a (freeware) version as a UI based tool available on Github.

@mondynet did you turn on verbose mode?
if not, just replace Write-Verbose -Message "$computer has hotfix $hotfix installed" with Write-output "$computer has hotfix $hotfix installed"

you will see something like this:
FRA3PWDC01 has hotfix KB4019472 installed
Example from an Windows 2016 based host.

It worked!

Enabled it via administrator Powershell prompt > Enable-PSRemoting

@mondynet good :)

There is also a (freeware) version as a UI based tool available on Github.

Here is a bit more information (After some comments and questions that arrived within the last hours)...

There are a few requirements:

• The PowerShell must be elevated (Run as Administrator)
• The RSAT Tools must be installed. Install it via Server Manager (Server) or Download (Client). Just Google for "Windows RSAT"
• The Computer that should run the scan needs to be Domain joined (If you want to use the Active Directory feature)
• The permissions needs to fit! The User needs to have permission in the Active Directory
• Remote PowerShell must be enabled: $null = (Enable-PSRemoting -Force) (Execute this on the REMOTE systems)

Optional:

• The remote system should allow Remote Management (Check the ‘Windows Remote Management’ Rule)

The last two points could be established manually or via an GPO Rule. You might want to remove these after the scan.

Sorry that I forgot to mention these requirements! But all of them are set on all of my systems and on the customer systems that I use frequently. We apply these settings with a base image and via DSC. So that was kind of normal for me :-)

Thanks to all for the feedback!

There is also a (freeware) version as a UI based tool available on Github.