3750
According to a Booz Allen analysis , spear - phishing emails containing weaponized Microsoft Word , Excel , and PowerPoint files , exactly the type of files typically found on laptop computers , were sent to Ukraine electric utility employees as early as May 2014 .
 ( phishing: were sent to,  May 2014: time, Ukraine electric utility employees: victim, spear - phishing emails: tool) 
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:
 ( phishing: were sent to,  May 2014: time, Ukraine electric utility employees: victim, spear - phishing emails: tool) 