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In the WannaCry attack , users were given three days to make the payment before the fee increased , and seven days before the files would be lost forever .
 ( ransom: payment,  three days: time, seven days: time, the files would be lost forever: attack pattern, users: 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: payment,  three days: time, seven days: time, the files would be lost forever: attack pattern, users: victim) 