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A group of financially motivated hackers is targeting networks and systems of North American companies , threatening to leak the stolen information and cripple the company by disrupting their networks if they do n’t pay a hefty ransom .
 ( ransom: pay a hefty ransom,  hackers: attacker, networks: victim, systems: victim, North American companies: victim, threatening to leak the stolen information: attack pattern, company: victim, disrupting their networks: 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: pay a hefty ransom,  hackers: attacker, networks: victim, systems: victim, North American companies: victim, threatening to leak the stolen information: attack pattern, company: victim, disrupting their networks: attack pattern) 