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Specifically , as of December 2014 , the information security team understood that the attacker had exfiltrated copies of user database backup files containing the personal data of Yahoo users but it is unclear whether and to what extent such evidence of exfiltration was effectively communicated and understood outside the information security team .
 the attacker: attacker; December 2014: time; copies of user database backup files: compromised data; the personal data: compromised data; Yahoo users: 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: data breach 
  Option: victim, attacker, attack pattern, purpose, damage amount, tool, time, place, number of victim, compromised data, number of data 
Text: {0} 
Answer:
 the attacker: attacker; December 2014: time; copies of user database backup files: compromised data; the personal data: compromised data; Yahoo users: victim