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Colorado Department of Transportation employees spent a second day offline Thursday as security officials investigated the damage done by a ransomware virus that hijacked computer files and demanded payment in bitcoin for their safe return .
 in bitcoin: payment method; hijacked computer files: attack pattern; a ransomware virus: tool; Colorado Department of Transportation: victim; employees: victim; Thursday: time
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:
 in bitcoin: payment method; hijacked computer files: attack pattern; a ransomware virus: tool; Colorado Department of Transportation: victim; employees: victim; Thursday: time