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The attackers then demand payment before returning control of the computers , often through money paid into bitcoin or other largely untraceable online currencies .
 The attackers: attacker; bitcoin: payment method; other largely untraceable online currencies: payment method; computers: 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:
 The attackers: attacker; bitcoin: payment method; other largely untraceable online currencies: payment method; computers: victim