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Cyber security researchers on Monday pointed to code in a " ransomware " attack that could indicate a link to North Korea .
 North Korea: place; Monday: 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:
 North Korea: place; Monday: time