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Infamous Necurs botnet seen sending spam emails containing new ransomware to millions of potential victims in just a few hours .
 Necurs botnet: attack pattern; spam emails containing new ransomware: attack pattern; victims: victim; a few hours: 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: phishing 
  Option: victim, attacker, attack pattern, purpose, damage amount, tool, time, place, trusted entity 
Text: {0} 
Answer:
 Necurs botnet: attack pattern; spam emails containing new ransomware: attack pattern; victims: victim; a few hours: time