944
The upstarts look unstoppable but might an obscure hacker called The Dark Overlord , previously connected to health sector data extortion , have spotted an important flaw in the model ?
 ( ransom: data extortion,  The Dark Overlord: attacker, health sector: victim) 
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:
 ( ransom: data extortion,  The Dark Overlord: attacker, health sector: victim) 