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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 .
 They: attacker; Bitcoins: payment method; £ 1,000: price; malicious software: tool
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: ransom 
  Option: victim, attacker, payment method, attack pattern, damage amount, tool, time, price, place 
Text: {0} 
Answer:
 They: attacker; Bitcoins: payment method; £ 1,000: price; malicious software: tool