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They demanded £ 1,000 initially in Bitcoins to decrypt the malicious software − and warned that failure to pay would render the files permanently inaccessible .
 ( ransom: demanded,  They: attacker, Bitcoins: payment method, £ 1,000: price, malicious software: tool) 
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: demanded,  They: attacker, Bitcoins: payment method, £ 1,000: price, malicious software: tool) 