It's nearly a plot line from the movies: World's largest oil producer gets hit by a cyber-attack that threatens to wipe away all data from its internal computers. But largely, this is the situation Saudi Aramco described today.

The Saudi Arabia-based, industry leader released a statement confirming that roughly 30,000 workstations were affected via cyber attack in mid-August. Details beyond that were scarce—Saudi Aramco said the virus "originated from external sources" and that its investigation into the matter was ongoing. There was no mention of whether this was related to this month's Shamoon attacks.

The company said it cleansed its workstations and resumed operations for its internal network today. They also added that oil exploration and production operations were unaffected because those networks were separate systems. Reuters attempted to reach out to the company further but saw its e-mails bounced back. The news outlet also noticed one of the company's sites taken down by attacks remained non-operational (aramco.com).

The mid-August attack on Saudi Aramco came during the same week when security researchers identified the Shamoon attacks mentioned above. Researchers saw those as a copycat to a malware known as Wiper, which reportedly attacked Iran's oil ministry in April. Researchers were reluctant to name targets of the Shamoon attacks at that time however.