Saudi Arabia's oil giant, Saudi Aramco says its 30,000 workstation computers are restored after a virus hit the world's largest oil producer.
The company was forced to take down its website after the attack which struck on August 15.
According to a message currently on the front page of the company’s website, most of the damage has now been repaired.
A ‘hacktivist’ group named the Cutting Sword of Justice has claimed responsibility for the attack in an online forum, saying the company was the main source of income for the Saudi government.
The group accused the Saudi regime of "crimes and atrocities" in several countries, including Syria and Bahrain.
Saudi Arabia has sent troops into Bahrain to back the Persian Gulf state’s rulers against anti-regime protesters.
Riyadh is also supporting insurgents who are fighting against the Syrian government of President Bashar al-Assad.
Last week security experts reported that a virus called “Shamoon” has targeted companies in the energy industry.