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According to researchers at Symantec Security Response , tracking ransom transactions would have been much more difficult if not for a bug in code that was supposed to create an individual bitcoin wallet for each victim : #WannaCry has code to provide unique bitcoin address for each victim but defaults to hardcoded addresses as a result of race condition bug — Security Response ( @threatintel ) May 16 , 2017 Because the code failed , it defaulted over the three preset wallets .
 ( ransom: ransom,  create an individual bitcoin wallet: attack pattern, victim: victim) 
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: ransom,  create an individual bitcoin wallet: attack pattern, victim: victim) 