Shamoon was used in the most damaging cyber attacks in history against Saudi Aramco and RasGas Co Ltd and destroyed data on more than 30,000 systems. Shamoon, also known as Disttrack, works by disabling systems by overwriting key computer files, making it impossible for computers to start up. The latest attack against Saipem reportedly crippled more than 300 of its servers and about 100 personal computers out of a total of roughly 4,000 machines. The company confirmed that it had already backed up the affected computers so there no possibility of data being lost in the cyber attack.
Source: https://thehackernews.com/2018/12/shamoon-malware-attack.html