738
I 'm just surprised that online bank thieves took so long in joining spying contractors in abusing the global SS7 network , " Karsten Nohl , a cybersecurity researcher who has highlighted vulnerabilities in SS7 , told Motherboard in an email .
 discover vulnerability: has highlighted
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: has highlighted