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BitPaymer is a complex cocktail of malware that enters a targeted system through a Trojan horse , then lies dormant until it ’s noticed and authorized users attempt to remove it , at which point it locks up the system with a demand for a sum of money payable in bitcoin .
 ransom: a demand for a sum of money
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: a demand for a sum of money