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Using Dropbox instead of a custom web server for collecting data is yet another sign that hackers are trying to stay hidden as long as possible .
 ( data breach: collecting data,  Using Dropbox: attack pattern, hackers: attacker) 
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: collecting data,  Using Dropbox: attack pattern, hackers: attacker) 