I think that ransomware attacks are just a drop in the ocean of bitcoin; the recent attacks have little to nothing to do with the price boost we experienced recently.
I would be more prone to consider the growing interest into the crypto currencies of more people from all around the world as the main cause of the spike we witnessed.
I agree. But what kind of "growing interest" is there in cryptocurrencies? Real interest for utility and usage that will benefit ordinary people like us or interest in making a lot of money, doing speculation and getting rich quick?
It's probably a combination of interests, I hear that Bitcoin is actually getting pretty popular in Japan for it's use as a currency, so I don't think it's all speculation.
But if you see a sudden price spike of 500 dollars in a day, that's most definitely fueled by pure speculation.
I wonder what the price will do if Australia regulates Bitcoin.