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As noted by cybersecurity researchers at Forcepoint , the Jaff campaign sprung to life on May 11 , using the Necurs botnet to send millions of spam emails emails to targets across the globe in the space of just a few hours .
 using the Necurs botnet: 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: phishing 
  Option: victim, attacker, attack pattern, purpose, damage amount, tool, time, place, trusted entity 
Text: {0} 
Answer:
 using the Necurs botnet: attack pattern