WannaCry Virus

less than 1 minute read


Last week, a new worm was unleashed that was hitting many organizations that had certain ports exposed to the internet. This is a guide to avoid this attack:

To Resolve:

1. The main fix: Block 139/445 at firewall, patch all servers

2. More detailed:

Check if SMB1 is enabled (2012 and above):

Get-SmbServerConfiguration | Select EnableSMB1Protocol

2008 R2 and below:

Get-ItemProperty -path “HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters” SMB1

If you want to fix it on an individual machine (2012 and above):

Set-SmbServerConfiguration -enableSMB1Protocol $false -confirm:$false

Fixing an individual system on 2008 R2 and below:

Set-ItemProperty -path “HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters” SMB1 -Type DWORD -Value 0 -Force

3. If you want to fix it network wide – GPO to disable it (works for all OSes):

Computer Configuration\Preferences\Windows Settings\Registry:

Action: Update


Key Path: SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters

Value name: SMB1

Value Type: REG_DWORD

Value Data: 0 (hexadecimal)

4. Things this will break if you implement these fixes: Mainly scan-to-folder functions on MFP’s/ check Reddit for others