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In one situation , a user paid a ransom to their attackers , but their attackers could not decipher the files encrypted by their own Trojan.Encoder ( Cryptolocker ) , and advised the user to seek help … from Doctor Web 's technical support service , " the webpage reads .
 their attackers: attacker; a user: 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:
 their attackers: attacker; a user: victim