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The demand was a significant increase on the ransomware ’s initial request for just less than $ 400 in Bitcoin when the malware was launched in the Ukraine last Tuesday before rapidly spreading through computer networks worldwide .
 ( ransom: initial request,  $ 400: price, in Bitcoin: payment method, the Ukraine: attacker, the malware: tool, last Tuesday: time, ransomware: 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: initial request,  $ 400: price, in Bitcoin: payment method, the Ukraine: attacker, the malware: tool, last Tuesday: time, ransomware: tool) 