The world’s third largest container line said on Monday that it was dealing with a cyber attack impacting peripheral servers, excluding its logistics arm, CEVA Logistics.

“As soon as the security breach was detected, external access to applications was interrupted to prevent the malware from spreading,” CMA CGM said.

Related: MSC confirms malware attack caused website outage

“Our teams are fully mobilized and access to our information systems is gradually resuming. The CMA CGM network remains available to the Group’s customers for all booking and operation requests.”

According to social media posts the cyber attack is in the form of ransomware, although the exact nature of the attack remains unknown.

“An investigation is underway, conducted by our internal experts and by independent experts,” the company said.

Earlier this year fellow container line MSC was hit by a malware attack, which took down all its customer facing systems, while logistics company Toll Group has been subject to two cyber attacks this year. IN 2017 Maersk Line was hit globally by the NotPetya malware attack.