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Details leaked by City of Atlanta employees during the ransomware attack , including screenshots of the demand message posted on city computers , indicated that Samsam - based malware was used .
 Samsam - based malware was used: attack pattern; the demand message: tool; city computers: victim
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:
 Samsam - based malware was used: attack pattern; the demand message: tool; city computers: victim