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" The cyber criminals behind this KillDisk variant can not supply their victims with the decryption keys to recover their files , despite those victims paying the extremely large sum demanded by this ransomware , " the ESET researchers said .
 ( ransom: paying,  victims: victim, KillDisk variant: tool, The cyber criminals: attacker, those victims: 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: paying,  victims: victim, KillDisk variant: tool, The cyber criminals: attacker, those victims: victim) 