Right off my knowledge of current enterprise sysadmin stuff it quite out of date.
Looking forward to learning :)What is RW? 
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My understanding it is a form of malware that encrypts your data 
and the only way to unlock it is to pay a ransom.The newer version attempts to extracts sensitive files prior to encryption,
so there will be a double threat.Not only is your data encrypted and unavailable, it is also in the hands of 
nefarious criminals who could publish the files or do something else 
evil with the files.Mitigation
--I dont know much about the extraction of files, I will leave that alone.Firewalls, endpoint protection, active analysis of data streams for unusual activities. 
I presume this is done and done correctly.Would backup save you?
..I am not sure of current practice, so this may be too old.A company should have a solid, maintained, well funded and staffed backup
strategy that is tested often to ensure it works.Then they have a backup system of the backup system off site entirely locked down.All files on fileservers are backup incrementally every 10 mins (or whatever)
as a continuous cycle.Fileservers databases, mailservers, another data silos are backup up in the same way.No end users PCs and extremely few in total have any access to the backup system.All PCs, servers, etc run premade images (is Ghost still a thing?).When shit hits the fan
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a)
Destroy all data from the past 30 mins / 1 hour, restore.b)
Destroy all data from the past 30 mins / 1 hour.
Reformat all computers, via standard images, 
restore backup.c)
Destroy all data from the past 30 mins / 1 hour.
Keep a set of pristine unused brand new computers in easy to reach storage. 
Format using images, restore data from before the files got encrypted,Unplug and junk existing PCs.-It seems to me that if a company has a well working backup strategy and executions then downtime for a ransomware attack can be timeboxed.   
If it needs done faster, then invest more into the system to make it happen.Maybe the reserve computers are already imaged as needed, and those images are
updated at the same time as the production PCs (end user for instance).Perhaps there are many datastores these days that are hard to backup?If that is the case, it might be a good reason not to use them?I am sure I am missing a lot and I look forward to learning moreIf the company has a solid, maintained, backup of files and data they can shut everything down, reformat the computers and servers, restore