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PGA of America computers were infected this week with a strain of malicious software that locked down critical files and demanded cryptocurrency for their return .
 locked down critical files: attack pattern; computers: victim; malicious software: tool; this week: time; PGA: victim; America: place
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:
 locked down critical files: attack pattern; computers: victim; malicious software: tool; this week: time; PGA: victim; America: place