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The situation is the latest example of cyber criminals deploying a form of software known as ransomware , which freezes up files on a computer network until someone enters a decryption code to unlock them .
 cyber criminals: attacker; ransomware: tool; freezes up files on a computer network: 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:
 cyber criminals: attacker; ransomware: tool; freezes up files on a computer network: attack pattern