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Hackers regularly break into systems and then bring them to a halt until the victims make ransom payments .
 ( ransom: ransom payments,  Hackers: attacker, the victims: victim, break into systems: attack pattern, bring them to a halt: attack pattern) 
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: ransom payments,  Hackers: attacker, the victims: victim, break into systems: attack pattern, bring them to a halt: attack pattern) 