Mediterranean Shipping Co (MSC) continues to keep its website offline for a fourth day as the boxship giant confronts a possible malware attack.

The Geneva-based owner of 471 vessels experienced an outage late Thursday night local time at one of its headquarter's data centres, prompting a shutdown of its outward-facing website as a precaution against a cyber attack.

The company has confirmed through continual posts on its Twitter feed that customers can still make bookings through its Intrra online platform and phone calls to its offices.