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"All communications to and from the CMA CGM Group are secure, including emails, transmitted files and electronic data interchanges. All our agencies as well as our back-office are now fully operational," the shipping company said in a statement.

The French shipping group's sites are live again with CMA CGM having fully regained control of its online systems after initially being hit by the cyberattack on September 28.

The ransomware attack on the Marseille-based carrier means that the four largest container shipping firms, Maersk, MSC, Cosco, CMA CGM, have all suffered a cyberattack over the last three years.

Sea-Intelligence consultant Lars Jensen pointed out on LinkedIn that "there should be no carriers out there, large or small, who has any doubt that the threat is real."

Mr Jensen believes shipping companies must strengthen their cyber defences and have a solid contingency plan in case of an attack, drawing a parallel between the proactive measures needed on cyberattacks and those on fire incidents, reports UK's Container News.

"Reduce the risk of the fire happening at all. If a fire breaks out, ensure the design of the vessel hinders the spread. Have a fire-fighting plan that is clear and well-rehearsed," he said.