An Omen of Things to Come

An omen of things to come to your Macintosh. Recommended reading for all members. 
http://www.macworld.com/article/3040987/security/apple-shuts-down-first-ever-ransomware-attack-against-mac-users.html

In order to protect your computer and its information, I suggest:
1 - Always have at least 1 up to date backup!
2 - Install all Apple updates and use no older system than Yosemite!
3 - Before clicking links and downloading and installing, ask yourself whether that is really what you want, and do you trust the place where it came from. 
4 - To scan your Mac occasionally for "Malware" - free Malwarebytes for Macintosh 
https://www.malwarebytes.org/antimalware/mac/
5 - To protect while using your Mac, scanning web, email and more - free Sophos home edition:
https://secure2.sophos.com/en-us/products/free-tools/sophos-antivirus-for-mac-home-edition-legacy/free-download.aspx