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If users clicked OK , the malicious app locked the device and displayed the following message : You need to pay for us , otherwise we will sell portion of your personal information on black market every 30 minutes .
 ( ransom: displayed,  locked the device: attack pattern, message: tool, the malicious app: tool) 
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: displayed,  locked the device: attack pattern, message: tool, the malicious app: tool) 