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They advised those whose networks have been effectively shut down by the ransomware attack not to make the payment demanded , the equivalent of $ 300 , paid in the digital currency bitcoin .
 ( ransom: ransomware attack,  networks: victim, shut down: attack pattern) 
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: ransomware attack,  networks: victim, shut down: attack pattern) 