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Once it had infiltrated the device , the malicious software demanded a ransom of $ 500 dollars to unlock the screen , which simulated a warning from the Department of Justice .
 ransom: demanded a ransom
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 ransom: demanded a ransom