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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 .
 victims: victim; KillDisk variant: tool; The cyber criminals: attacker; those victims: victim
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: ransom 
  Option: victim, attacker, payment method, attack pattern, damage amount, tool, time, price, place 
Text: {0} 
Answer:
 victims: victim; KillDisk variant: tool; The cyber criminals: attacker; those victims: victim