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Although Microsoft in March made available a patch for the Windows flaw that EternalBlue exploited , Petya uses other techniques to infect systems , said Jeff Greene , Symantec government affairs director .
 ( patch vulnerability: made available,  EternalBlue exploited: issues addressed, the Windows flaw: vulnerability, a patch: patch, March: time, Microsoft: releaser) 
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:
 ( patch vulnerability: made available,  EternalBlue exploited: issues addressed, the Windows flaw: vulnerability, a patch: patch, March: time, Microsoft: releaser) 