425
“ On Monday , May 15 , a security researcher from Google posted an artifact on Twitter potentially pointing at a connection between the WannaCry ransomware attacks that recently hit thousands of organizations and private users around the world , and the malware attributed to the infamous Lazarus hacking group , responsible for a series of devastating attacks against government organizations , media and financial institutions , ” Kaspersky said .
 ( ransom: WannaCry ransomware attacks, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( ransom: WannaCry ransomware attacks, None) 