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Instead of paying the ransom demand , the KeepKey team managed to stall the attacker for two more hours , during which time they regained access to all but one account , the company 's Twitter profile .
 ( ransom: paying the ransom demand,  the KeepKey team: victim, the attacker: attacker) 
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: paying the ransom demand,  the KeepKey team: victim, the attacker: attacker) 