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In a typical ransomware attack , an attacker compromises a computer via malware or Trojan and encrypts local data that can only be unlocked with an encryption key obtained for a price .
 an attacker: attacker; compromises a computer via malware or Trojan: attack pattern; encrypts local data: attack pattern
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:
 an attacker: attacker; compromises a computer via malware or Trojan: attack pattern; encrypts local data: attack pattern