This week the CIA revealed that they belive it was Russia behind the NotPetya attacks that hit in June 2017. They used an attack vector know as a “Watering Hole”. This method infects a website in which they know their targets will be visiting.
In the case of NotPetya the website was a Ukrainian site that deployed updates for tax and accounting software. One the malware had been deployed it appeared to be a ransomware attack. But unlike WannaCry , NotPetya wiped and erased all information on the infected system. This means the attacker where not after money. It was a disruptive nuance attack that could have potently erased a large amount of sensitive data.
There has been increasing tension between Russia and Ukraine and considering that Russia has increased it level of aggression in recent months it comes as no surprise that they have begun lunching cyber attacks on this scale.