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The hackers are using an alleged cache of stolen email accounts and passwords as leverage in an attempt to extort the world ’s most valuable company .
 ( ransom: extort,  the world ’s most valuable company: victim, using an alleged cache of stolen email accounts and passwords as leverage: attack pattern, The hackers: attacker) 
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: extort,  the world ’s most valuable company: victim, using an alleged cache of stolen email accounts and passwords as leverage: attack pattern, The hackers: attacker) 