McAfee: Cryptocurrency, Healthcare Attacks Increased in Late 2017. Cybercriminals focused more of their attention on cryptocurrency, especially Bitcoin, as well as healthcare facilities. The price of Bitcoin has fallen, but cybercrooks are still eyeing ways to take advantage of volatile cryptocurrency prices. McAfee researchers recorded eight new sample threats every second, an increase from four per second during previous periods. Overall, ransomware samples grew 59% over the last year, while new ransomware examples increased 35% in the fourth quarter.”]