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That ’s just what happened to guests at a luxury hotel in Austria when they were left stranded outside of their rooms after a ransomware attack that overrode electronic key systems .
 ( ransom: a ransomware attack,  overrode electronic key systems: attack pattern, a luxury hotel: attacker, guests: victim, Austria: place, they: 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: a ransomware attack,  overrode electronic key systems: attack pattern, a luxury hotel: attacker, guests: victim, Austria: place, they: victim) 