OilRig is an Iranian-linked cyber espionage group that has been active since 2015, and this group is known for its sophisticated spear-phishing campaigns and advanced infiltration techniques.  This group conducts a multitude of cyber attacks against various sectors, and among them, the most executed ones are intelligence gathering, surveillance, and high-profile cyberattacks. Besides this, cybersecurity researchers at Cyble recently identified that OilRig hackers have been actively attacking Middle Eastern entities and organizations related to Iranian interests.  The group continually evolves its tools to evade detection and has expanded its operations to include disruptive attacks like ransomware and data-wiping.

Source: GBHackers