According to Wordfence, one of the front line protectors of all things WordPress, there is a massive ransomware attack ongoing affecting Windows computers and their related networks.
Called WanaCryptor, it functions similar to other ransomware in locking down files on an infected system unless the victim makes a payment. Ransomware infects machines though inadvertent clicks on malware links in bogus or phishing emails that pose as legitimate communications.
According to Microsoft, a fix for this vulnerability was released on March 14th for all affected versions of Windows.
US CERT has also published a blog post on this and sent out warning emails to let systems admins and user know of the threat.
Gizmodo is updating this page with information on the current threat and information on how its spreading.
More details here from Wordfence and US CERT website…
https://www.us-cert.gov/ncas/current-activity/2017/05/12/Multiple-Ransomware-Infections-Reported