1084
Usually , these types of groups launch DDoS attacks and then send emails to their victims requesting for payments to stop the attacks .
 ( ransom: requesting for payments,  groups: attacker, launch DDoS attacks: attack pattern, their victims: 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: requesting for payments,  groups: attacker, launch DDoS attacks: attack pattern, their victims: victim) 