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This twisted tale starts in July 2016 , when security researcher Ryan Hanson discovered a flaw in RTF files that he could exploit to execute code on the underlying operating system .
 ( discover vulnerability: discovered,  a flaw: vulnerability, security researcher Ryan Hanson: discoverer, July 2016: time, exploit to execute code on the underlying operating system: capabilities) 
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: discovered,  a flaw: vulnerability, security researcher Ryan Hanson: discoverer, July 2016: time, exploit to execute code on the underlying operating system: capabilities) 