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It seems that the hackers belong to one of the many bug bounty hunting groups that are finding flaws in systems of big companies in exchange for money .
 ( discover vulnerability: are finding,  the many bug bounty hunting groups: discoverer, flaws: vulnerability, systems: vulnerable system, big companies: vulnerable system owner, the hackers: 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: are finding,  the many bug bounty hunting groups: discoverer, flaws: vulnerability, systems: vulnerable system, big companies: vulnerable system owner, the hackers: discoverer) 