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For the second time in three years , the school district is the target of a ransomware attack — a particularly virulent computer malware that spreads from computer to computer , locking up access to network servers and turning documents into gibberish before offering " help " in the form of a request for payment to provide a " key " to unlock the files .
 computer malware: tool; the school district: 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:
 computer malware: tool; the school district: victim