In a statement released on Sunday, world's largest oil producer Saudi Aramco confirmed that a cyber-attack hit the company on August 15, leaving as many as 30,000 of its workstations infected with malware.

Saudi Aramco said in its statement that the mid-August 30K workstation attack infected the company's internal computers, and threatened to obliterate all data from the systems.

The bigwig oil producer further added that the virus had "originated from external sources," and that it was still investigating into the cyber-attack, the responsibility of which has been claimed by a which calls itself the "Cutting Sword of Justice."

According to the Saudi Aramco statement, some of the isolated network systems which remained unaffected by the cyber-attack included enterprise systems used for hydrocarbon exploration and product, and the production facilities.

While confirming the attack, the company also revealed that the operations of its main internal computer networks had resumed, after the affected computers had been "cleaned and restored to service." It further added that the staff had also got back to work on August 25, after the Muslim Eid holidays;

Assuaging the attack-related concerns of the company's stakeholders, customers and partners, Saudi Aramco's CEO Khalid al-Falih said that the cyber-attack had not affected "our core businesses of oil and gas exploration, production and distribution from the wellhead to the distribution network," and added that these businesses were "functioning as reliably as ever."