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Ransomware , a kind of malware which locks infected systems , encrypts files and demands a payment in return for decryption , can be debilitating for businesses .
 ( ransom: demands a payment,  encrypts files: attack pattern, locks infected systems: attack pattern, Ransomware: tool) 
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: demands a payment,  encrypts files: attack pattern, locks infected systems: attack pattern, Ransomware: tool) 