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Cyberthieves are increasingly targeting the malicious software , which locks all files on a targeted computer or network until the owner pays up , at smaller and arguably more vulnerable organizations .
 ( ransom: pays up,  locks all files on a targeted computer or network: attack pattern, Cyberthieves: attacker, the malicious software: victim, the owner: 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: pays up,  locks all files on a targeted computer or network: attack pattern, Cyberthieves: attacker, the malicious software: victim, the owner: victim) 