Ransomware seems to be the trend in the world of cyber attacks. The WannaCry outbreak happened in May 2017; it spread to over 150 countries and infected more than 230,000 computers in just one day. The NotPetya attack too affected over 100 countries and devastated networks in large numbers. The CRYSIS ransomware, which first appeared in 2016, resurfaced in 2017 and did brisk business extorting money from victims, especially in Australia and New Zealand. The Jigsaw ransomware comes with a ransom note that carries an image of the iconic character from the movie ‘Saw'”]
Source: https://hackercombat.com/the-most-infamous-ransomware-attacks-of-2017/