424
Kaspersky Lab , a cybersecurity and antivirus provider in Moscow , said in a statement that a security researcher at Google found an “ artifact ” on Twitter potentially linking the WannaCry ransomware attacks that hit organizations and individuals in several dozen countries and the Lazarus hacking group which was responsible for several devastating cyberattacks on government organizations , media firms and financial institutions in recent years .
 ( 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) 