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Link11 , who tracked those attacks , claimed the group used a DDoS botnet built with the Mirai IoT malware and asked for 5 Bitcoin ( $ 6,000 ) to stop attacks .
 ( ransom: asked for,  5 Bitcoin: price, $ 6,000: price, used a DDoS botnet built with the Mirai IoT malware: attack pattern, the group: attacker) 
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: asked for,  5 Bitcoin: price, $ 6,000: price, used a DDoS botnet built with the Mirai IoT malware: attack pattern, the group: attacker) 