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The attacker asked for $ 400 to unlock the company 's systems , but the victim refused and instead recovered its data via older backups .
 ( ransom: asked for,  The attacker: attacker, $ 400: price, systems: victim, company: 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: asked for,  The attacker: attacker, $ 400: price, systems: victim, company: victim) 