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More : LG Smart TV Screen Bricked After Android Ransomware Infection Now , unsecured MongoDB databases are being hijacked by a hacker , who is not only wiping out these databases but also storing copies of them and asking for a ransom of 0.2 bitcoins ( roughly US$ 211 ) from admins in exchange of the lost data .
 ( ransom: asking for a ransom,  0.2 bitcoins: price, US$ 211: price, hacker: attacker, are being hijacked: attack pattern, Now: time, MongoDB databases: victim, storing copies: attack pattern, wiping out these databases: 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: asking for a ransom,  0.2 bitcoins: price, US$ 211: price, hacker: attacker, are being hijacked: attack pattern, Now: time, MongoDB databases: victim, storing copies: attack pattern, wiping out these databases: attack pattern) 