. http://www.catonetworks.com/blog/how-to-stop-wannacrypt-infections-with-the-cato-cloud/
blog article
HOW TO STOP WANNACRYPT INFECTIONS WITH THE CATO CLOUD
The Cato Cloud should be configured to inspect WAN traffic, preventing WannaCrypt from spreading across the company in the event of an infection (Figure 5). This is done by blocking unnecessary SMB traffic between branches. In the case of an attack, users  should be limited to the local a site or, if necessary, a VPN, – not the entire WAN.

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