Guwahati, April 15: The central and state intelligence agencies have begun their probe into a major cyber-attack in the field headquarters of state-owned Oil India Ltd (OIL) in eastern Assam’s Duliajan, officials said on Thursday.

The hacker has demanded $75,00,000 as ransom.

OIL’s Manager, Security, Sachin Kumar, who filed an FIR with the police on Tuesday night, complained that their server, network, and other related services were affected due to the cyber attack of ransomware on Sunday.

OIL spokesperson Tridiv Hazarika, however, said that exploration and production work of the company have not been affected due to the suspected cyber-attack.

“OIL is a public sector undertaking, and due to this ransomware cyber attack, OIL and the government exchequer have incurred huge financial loss as business through IT has been seriously affected,” Kumar mentioned in his FIR with the Police.

OIL is India’s second largest national ‘Navratna’ company after ONGC in terms of total proved plus probable oil and natural gas reserves.