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For example , after gaining access to MySQL servers , attackers created a new database called PLEASE_READ and left a table inside it called WARNING that contained their ransom demands .
 ( ransom: their ransom demands,  left a table inside it called WARNING: attack pattern, created a new database called PLEASE_READ: attack pattern, attackers: attacker, gaining access to MySQL servers: 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: their ransom demands,  left a table inside it called WARNING: attack pattern, created a new database called PLEASE_READ: attack pattern, attackers: attacker, gaining access to MySQL servers: attack pattern) 