1387
Two months after this campaign , towards the end of March , FireEye says it detected the zero - day again , but this time used by a group of cyber-criminals spreading LatentBot , a sophisticated backdoor trojan , usually found in enterprise environments and used for economic espionage campaigns .
 ( discover vulnerability: detected,  the zero - day: vulnerability, FireEye: discoverer) 
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:
 ( discover vulnerability: detected,  the zero - day: vulnerability, FireEye: discoverer) 