Mantax Otax is a new Android malware combining ransomware and spyware capabilities that encrypts files on older Android devices, steals sensitive data including credentials and messages, and harasses victims through pop-ups and intimidation tactics. Indonesian operators distribute it via malicious APKs outside Google Play using phishing and social engineering, with the malware abusing Accessibility services to gain extensive device control and communicating with C2 infrastructure hosted on GitHub and Firebase.