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However , as the world returned to the office on Monday , those payments have been rapidly mounting , based on tracking data for the three Bitcoin wallets tied by researchers to the malware .
 ( ransom: payments,  Monday: time, Bitcoin wallets: payment method, malware: 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: payments,  Monday: time, Bitcoin wallets: payment method, malware: tool) 