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Earlier this month it was widely reported that Walt Disney ’s CEO Bob Iger had been contacted by hackers who were threatening to release one of the studio ’s movies onto the internet unless a ransom was paid .
 ( ransom: a ransom was paid,  hackers: attacker, threatening to release one of the studio ’s movies: attack pattern, Walt Disney: victim, CEO Bob Iger: 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: a ransom was paid,  hackers: attacker, threatening to release one of the studio ’s movies: attack pattern, Walt Disney: victim, CEO Bob Iger: victim) 