This video is a brief demonstration of the threat phishing emails pose to end-users. In this instance, emails were spoofed to appear as if they were coming from Microsoft, instructing the user to download and open an attachment, which is actually CTB-Locker, a ransomware variant. (NOTE: This video does NOT contain audio.)
You can read the full blog post about this phishing attack here:
You can watch this video also at the source.