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Cyber researchers have tied the vulnerability exploited by Petya to the one used by WannaCry — a weakness discovered by the NSA years ago that the agency turned into a hacking tool dubbed EternalBlue .
 discover vulnerability: discovered
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:
 discover vulnerability: discovered