3089
Researchers say a piece of ransomware disguised as a battery app made its way into the Play store .
 ( phishing: disguised as,  a battery app: trusted entity, the Play store: trusted entity, ransomware: 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:
 ( phishing: disguised as,  a battery app: trusted entity, the Play store: trusted entity, ransomware: tool) 