The WanaCrypt0r attacks begin in an organization through a phishing attack via a phishing email that includes a malicious link or PDF document. A successful phishing attack results in the WanaCrypt0r ransomware on the target system and an attempt to spread the WanaCrypt0r ransomware more broadly on the network using the SMB protocol to attack the EternalBlue vulnerability (CVE-2017-0144) on Microsoft Windows systems. This vulnerability was addressed by Microsoft in March 2017 with MS17-010. This vulnerability was publicly disclosed by the Shadow Brokers group in April 2017. Organizations that have applied MS17-010 are not at risk for the spread of WanaCrypt0r across the network. Because MS17-010 addresses a remotely exploitable vulnerability in a networking component and is now under active attack, we strongly urge making deployment of this security update a priority.

Following the world wide cyber attack, Palo Alto Networks research unit has published an articale on the prevetnion of the attack.

it can be found here:

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