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For instance , we have discussed before how an individual hacker or hacking group known as The Dark Overlord has targeted investment banks – stealing internal documents and bringing them to the public ’s attention in an attempt to extort more money .
 ( ransom: extort more money,  The Dark Overlord: attacker, investment banks: victim, bringing them to the public ’s attention: attack pattern, stealing internal documents: 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: extort more money,  The Dark Overlord: attacker, investment banks: victim, bringing them to the public ’s attention: attack pattern, stealing internal documents: attack pattern) 