My friend and colleague Stephen Cobb, for ESET, recently posted an article on Jackware: When connected cars meet ransomware. He says:
I define jackware as malicious software that seeks to take control of a device, the primary purpose of which is not data processing or digital communications. A car would be such a device. A lot of cars today do perform a lot of data processing and communicating, but their primary purpose is to get you from A to B. So think of jackware as a specialized form of ransomware. With regular ransomware, such as Locky and CryptoLocker, the malicious code encrypts documents on your computer and demands a ransom to unlock them. The goal of jackware is to lock up a car or other device until you pay up.
Fortunately, and I stress this: jackware is, as far as I know, still theoretical. It is not yet “in the wild”
So speculation, but informed speculation, a hot topic, and well-written (of course).