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The WannaCry ransomware attacks targeted and affected users in various countries across the globe by encrypting data files on infected computers and demanding users pay a $ 300 USD ransom in bitcoin to decrypt their files .
 ( ransom: WannaCry ransomware attacks,  users: victim, encrypting data files: attack pattern, computers: victim) 
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: WannaCry ransomware attacks,  users: victim, encrypting data files: attack pattern, computers: victim) 