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Attacks with this ransomware strain were first spotted last Monday , August 13 , according to independent security researcher MalwareHunter , who first tweeted about this new threat .
 this ransomware strain: tool; last Monday , August 13: 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:
 this ransomware strain: tool; last Monday , August 13: time