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Kettell Video Productions was targeted by tech scammers who infected its IT systems with viruses before demanding £ 1,000 in online currency Bitcoins or the files would be permanently deleted .
 £ 1,000: price; in online currency Bitcoins: payment method; infected its IT systems with viruses: attack pattern; Kettell Video Productions: victim; tech scammers: attacker
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:
 £ 1,000: price; in online currency Bitcoins: payment method; infected its IT systems with viruses: attack pattern; Kettell Video Productions: victim; tech scammers: attacker