542
Cybersecurity experts say the hackers behind the " WannaCry " ransomware , who demanded $ 300 payments to decrypt files locked by the malware , used a vulnerability that came from U.S. government documents leaked online .
 ransom: demanded
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