State-giant Saudi Arabian Oil Co., known as Saudi Aramco, said Sunday it has restored all of its main internal network services after they were hit earlier this month by a virus that affected about 30,000 workstations.

The virus, which originated from external sources, forced the world's largest oil producer to isolate all its electronic systems from outside access, but left the company's operations unaffected.

The workstations have since been cleaned and restored to service and, as a precaution, remote Internet access to online resources was restricted, Aramco said in a statement.

The company said that its primary enterprise systems of hydrocarbon exploration and production were unaffected as they operate on isolated network systems.

Production plants were also fully operational as these control systems are also isolated.

The disruption is suspected to be the result of a virus that had infected personal workstations without affecting the primary servers and components of Saudi Aramco's network.

But the company continues to investigate the causes of the incident and those responsible for it.

Saudi Aramco produced an average of 9.1 million barrels of oil a day last year.

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