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One week ago a global cyberattack dubbed “ unprecedented ” by Europol began infecting an estimated 200,000 of the world ’s computers , starting a seven - day countdown to the destruction of data if victims did not pay a ransom .
 ( ransom: a global cyberattack,  One week ago: time) 
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: a global cyberattack,  One week ago: time) 