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Among the first large organizations to be impacted by WannaCry is The National Health Service in the UK , which has publicly confirmed that it was attacked by the Wan na Decryptor .
 ( ransom: was attacked,  it: victim, Wan na Decryptor: tool, the first large organizations: victim, WannaCry: tool, The National Health Service: victim, the UK: place) 
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: was attacked,  it: victim, Wan na Decryptor: tool, the first large organizations: victim, WannaCry: tool, The National Health Service: victim, the UK: place) 