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Mere days after thousands of MongoDB databases were hit by ransomware attacks , cybercriminals have set their sights on ElasticSearch servers , according to reports .
 ( ransom: were hit by ransomware attacks,  MongoDB databases: victim, cybercriminals: attacker, ElasticSearch servers: victim) 
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: were hit by ransomware attacks,  MongoDB databases: victim, cybercriminals: attacker, ElasticSearch servers: victim) 