"Trend Micro Ransomware Screen Unlocker is a free tool for removing "lock screen" ransomware, malware which pops up when your computer starts and won't allow you to access the rest of your PC..." http://www.pcadvisor.co.uk/download/security/trend-micro-ransomware-screen-unlocker-2001016-3330963/ Trend Micro Ransomware Screen Unlocker for USB http://www.pcadvisor.co.uk/download...nsomware-screen-unlocker-usb-2001017-3330964/
http://www.thewindowsclub.com/trend-micro-ransomware-screen-unlocker-tool http://www.ghacks.net/2016/08/21/trend-micro-ransomware-screen-unlocker-tool/
@Hiltihome lock screen ransomware makes a comeback dated from march this year, and (you must like this one) "cat loving ransomeware" from august this year
Forgot to mention, that I meant Windows screen lockers, while "cat loving ransomware" is for Android. Also the linked article says: "Trend Micro stats from earlier this year found that crypto-ransomware variants accounted for 100% of UK enterprise infections in February and 99% in January, for example." So where does the comeback happen? On Android phones? Yes, it happens now and then...
The article is from March, so it mentions stats of jan and feb. I am not telling you are wrong, just pointed to article because you said you had not seen them in the wild for at least a year.