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In a ransomware attack , hackers place malware on a computer — or system of computers — that restricts access , and then demand payment to undo it .
 hackers: attacker; place malware on a computer: 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:
 hackers: attacker; place malware on a computer: attack pattern