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Using " scareware " messages and posing as law enforcement , the scammers used the pop - ups to extort money in the form of iTunes gift cards from the victim , promising to unlock the browser for a sum of money .
 ( ransom: extort money,  the scammers: attacker, iTunes gift cards: payment method, the victim: victim, used the pop - ups: 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 money,  the scammers: attacker, iTunes gift cards: payment method, the victim: victim, used the pop - ups: attack pattern) 