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To pay the ransom , victims have to enter their credit card number directly in the ransom screen , a technique very different from how other ransomware operators like to work , which is via Bitcoin , Tor , or gift cards .
 ( ransom: pay the ransom,  victims: victim, credit card: payment method, Bitcoin: payment method, gift cards: payment method, Tor: payment method) 
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: pay the ransom,  victims: victim, credit card: payment method, Bitcoin: payment method, gift cards: payment method, Tor: payment method) 