Ransomware DoubleLocker is a new Android ransomware that uses Android accessibility services. It can change devices PIN to prevent users from accessing the device and also it encrypts all the files in the device. Given its banking malware roots, it may well be turned into what could be called ransom-bankers. Given the accessibility permissions, it obtains admin rights and the set up a default home application without user’s knowledge. The only possible option is to do a factory reset to clean the infection and there is no way to recover the data.”]
Source: https://gbhackers.com/android-ransomware-doublelocker/