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The malicious programs encrypt the infected computers ’ files , and users can only open them after paying the perpetrators money to obtain a special key to unlock them .
 the perpetrators: attacker; encrypt the infected computers ’ files: attack pattern; users: victim; The malicious programs: tool
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:
 the perpetrators: attacker; encrypt the infected computers ’ files: attack pattern; users: victim; The malicious programs: tool