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The attackers , the researchers later determined , had used the tools to collect passwords of system administrators and for the remote administration of infected host machines .
 ( data breach: collect,  The attackers: attacker, passwords: compromised data, system administrators: victim, infected host machines: attack pattern) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( data breach: collect,  The attackers: attacker, passwords: compromised data, system administrators: victim, infected host machines: attack pattern) 