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The ransomware attack targeting global hospitals , governments and telecoms using a leaked National Security Agency ( NSA ) exploit may be the result of a " targeted attack gone horribly wrong " , according to a team of well - regarded security researchers .
 ( ransom: ransomware attack,  hospitals: victim, governments: victim, telecoms: victim, using a leaked National Security Agency ( NSA ) exploit: attack pattern) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( ransom: ransomware attack,  hospitals: victim, governments: victim, telecoms: victim, using a leaked National Security Agency ( NSA ) exploit: attack pattern) 