According to the company, the attack did not affect any core business systems, nor did it hit production operations.

"The company employs a series of precautionary procedures and multiple redundant systems within its advanced and complex system that are used to protect its operational and database systems," Saudi Aramco said, adding that it hopes to restore normal network operations soon.

The company, which is fully owned by the Saudi Arabian government, has not provided any updates since Wednesday so it remains unclear whether the affected networks have been restored. Several attempts to reach the company's main website were unsuccessful Friday afternoon, though it's unclear whether that is connected to the attack earlier this week.

In a statement posted on PasteBin, the hitherto unknown Arab Youth Group suggested the attack against Aramco's "administrable structures and substructures" had been carried out to protest what it claimed was the support shown to Israel and the United States by Saudi leaders.

"These betrayals are done with oil wealth of the Arab nation," the group claimed, warning of more "severe action" against companies such as Aramco.