The Maritime Executive has a decent article detailing cyber threats to ships while underway:

In 2017, I.H.S. Fairplay conducted a maritime cyber security survey, to which 284 people responded. 34 percent of them said that their company had experienced a cyber attack in the previous 12 months. Of those attacks, the majority were ransomware and phishing incidents; exactly the same sort of incidents affecting companies everywhere, and not at all specific to the maritime world.

The good news is that only 30 percent of those responding to the survey had no appointed information security manager or department, meaning that the majority of companies have a resource able to respond and mitigate any attack.

However, the survey did reveal that there are still a lot of employees who have not received cyber awareness training of any kind, which means the shipping industry must try harder, for its own security.

Additionally, only 66 percent of those questioned said that their company had an IT security policy, which is a serious cause for concern; IT security cannot be approached on an ad hoc, incident by incident basis. It’s the security equivalent of plugging holes in a hull with cardboard.

To underline that, 47 percent of those questioned believed that their organization’s biggest cyber vulnerability was the staff. Hardly a glowing endorsement but, if you don’t train your staff to be aware of threats, it’s not surprising.

Cyber security absolutely starts with awareness training. If the employees have no clue about cyber security, nor is there a company culture to take it serious, then the organizations is almost guaranteed they will be breached, even by amateur hackers, much less the more sophisticated types.