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The research team at Check Point found that one of the pre-installed malwares was Slocker , a mobile ransomware , that uses the Advanced Encryption Standard ( AES ) encryption algorithm to encrypt all files on the device and demand ransom in return for their decryption key .
 ( ransom: demand ransom,  the device: victim, encrypt all files: attack pattern, uses the Advanced Encryption Standard ( AES ) encryption algorithm: attack pattern, Slocker: tool, mobile ransomware: tool, pre-installed malwares: 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: demand ransom,  the device: victim, encrypt all files: attack pattern, uses the Advanced Encryption Standard ( AES ) encryption algorithm: attack pattern, Slocker: tool, mobile ransomware: tool, pre-installed malwares: tool) 