629
SLocker encrypts images , documents , and videos , as well as blocks access to the device before demanding payment to unlock the phone and its contents .
 ( ransom: demanding payment,  blocks access to the device: attack pattern, SLocker encrypts images , documents , and videos: attack pattern, the phone: 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: demanding payment,  blocks access to the device: attack pattern, SLocker encrypts images , documents , and videos: attack pattern, the phone: victim) 