3719
Specifically , researchers found an Android version of X-Agent , a piece of malware known to be used by Fancy Bear , embedded in an app developed by artillery officer Yaroslav Sherstuk to help military personnel reduce the time to fire D - 30 howitzers .
 discover vulnerability: found
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: found