WordFence sent the following alert today:
A massive global ransomware attack on machines running the Windows operating system is underway and spreading quickly. We have published a public service announcement that gives you a high level overview of the attack along with advice on how to protect yourself.
Please be vigilant when opening attachments from unknown senders or unexpected attachments.
One of our clients fell victim to a ransomware attack in April.
In this case, Microsoft has been aware of the vulnerability since March 2017, when it published a Security Bulletin covering the potential risk. According to the Spanish newspaper El Mundo, early indicators seem to point to the attack originating in China, but more information is needed.