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The attackers , the Lookout researchers said , purchased a large number of domains in an attempt to " catch users that are seeking controversial content on the internet and coerce them into paying a ransom to them . "
 ( ransom: paying a ransom,  them: attacker, users: victim, The attackers: attacker) 
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: paying a ransom,  them: attacker, users: victim, The attackers: attacker) 