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" Ransomware " is a specific type of malicious software that infects computers and locks or encrypts their content , demanding a ransom to return the machines to their original state .
 ( ransom: demanding a ransom,  Ransomware: tool, the machines: victim, locks or encrypts their content: attack pattern, infects computers: 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: demanding a ransom,  Ransomware: tool, the machines: victim, locks or encrypts their content: attack pattern, infects computers: attack pattern) 