Journalists examined crew lists of more than 2,000 vessels that have been sanctioned by the United States and the European Union, as well as those included on the list maintained by Ukraine's Main Intelligence Directorate.
The Ukrainian Ministry of Defence blames Russia for the attack, saying that the country is intentionally conducting information operations against Ukraine.
French newspaper Le Figaro reports that offshore services provider Bourbon became the target of a cyber attack that greatly affected its company-wide computer network late last week.
In a brief public statement issued Monday, Italian subsea engineering and oil services firm Saipem announced that it had detected an attack on its regional server systems in the Middle East.
