Organizers of the 2018 Winter Olympics in Pyeongchang, South Korea confirmed on Sunday that hackers targeted the event's opening ceremony.
But, they didn't disclose who was behind the cyber attack.
Now, researchers from Cisco's Talos Intelligence Group believe they've discovered a piece of malware, referred to as the 'Olympic Destroyer,' that may have been used in the attack.
Additionally, researchers from cyber security firms CrowdStrike and FireEye confirmed similar findings in statements to Reuters.
Before the opening ceremony began, the official Pyeongchang website went down, which meant customers were unable to print tickets or access other information.
The attack also left the Olympic stadium without WiFi, while internet and television were disrupted in the press center.
The website wasn't brought back online until 12 hours after servers had been hit.
'We know the cause of the problem but that kind of issues occurs frequently during the Games,' Pyeongchang organizing committee spokesman Sung Baik-you told Reuters.