'Ransomware' in the browser
It seems our ransomware friends have decided to go on an easier path. Instead of having to infect machines they now just hijack the browser. This is done via advertisements. Where you would normally get an exploit kit to drop the ransomware on the machine it is now just a website. It does not load an exploit kit, no malware just a webpage.
Edit: It was pointed out to me that this is ‘Browlock’ as described here by F-Secure: http://www.f-secure.com/weblog/archives/00002590.html