3742
Once users activated the file attached in the email , their files were encrypted and had to pay the distributor a certain ransom to decrypt these files .
 ( ransom: had to pay,  their files were encrypted: attack pattern, the distributor: attacker, users: victim) 
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: had to pay,  their files were encrypted: attack pattern, the distributor: attacker, users: victim) 