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The White House has publicly blamed North Korea for a ransomware attack in May that locked more than 300,000 computers in 150 countries .
 North Korea: attacker; May: time; locked more than 300,000 computers in 150 countries: 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:
 North Korea: attacker; May: time; locked more than 300,000 computers in 150 countries: attack pattern