This post is more of a how-to prevent randomsware post.
Our business network uses all Windows 10 computers. However, our sales force has very limited knowledge of how computers work and will tend to install software without thinking about it. They do have access to some folders on our server to store manufacturing prints, etc. In the past we tried to combat viruses with anti-virus software and offsite file backup services. I am the IT person at this company, and to be honest I am somewhat amateur with business networks, but I try.
One day a salesman called me in to ask about files not being able to open and of course one of these ransom notes. I barely read the note and didn't bother with completing it as I knew what had to be done.
I wiped the entire server and restored the backup to a prior date. Then I went to all the Windows computers and locked them down from installing any software by revoking the users privileges and creating a new standard user group on the domain. Since then I have had a few employees ask if they could install some BS software, and I would just let them know that they don't need to be doing things like that on our company computers.
I'm pretty sure we are now 90% protected from ransomware. The only possibility would be if I somehow would get it in the future, but we can always do a system restore thanks to our offsite file backup service.
The only way you could be a victim of ransomware is if you don't have an offsite file backup system. So please, do some research and purchase one. You will be thankful in the future should such a thing happen to you or your company.