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Six months of relative quiet around exploit kits recently changed when a public proof - of - concept attack disclosed by a Texas startup was integrated into the Sundown Exploit Kit .
 ( discover vulnerability: disclosed,  proof - of - concept attack: vulnerability, Texas startup: discoverer, Sundown Exploit Kit: vulnerability) 
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: disclosed,  proof - of - concept attack: vulnerability, Texas startup: discoverer, Sundown Exploit Kit: vulnerability) 