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The hacking tool spreads silently between computers , shutting them down by encrypting data and then demanding a ransom of US$ 300 to unlock them .
 ransom: demanding 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: demanding a ransom