On 12th May 2017, many health services around the world suffered the attack of the “WannaCry” ransomware. This paper exposes the main consequences faced by them in the United States, Great Britain, Germany, Australia, New Zealand and Spain, and the possibilities according to the Spanish Criminal Code of prosecuting this kind of crimes, demonstrating that we must secure the internal excellence of each individual health service, promote the development of new, more technical articles in the mentioned legal text and, above all, strengthen the international cooperation in order to effectively prosecute these attacks.