Mostonet Anti-Malware is a completely free and ad-free anti-virus App for Android.
It is based on the fork of LibreAV, whose source code can be examined here: https://github.com/projectmatris/antimalwareapp
Mostonet Anti-Malware uses two scanning techniques.
A classic, based on static viral signatures and an advanced one based on the open-source TensorFlow framework trained to analyze the permissions that an App requires and their use.
The virus signature database is internal to the App and is updated together with the scanning engine at each App update.
No data is transferred or installed on the user's device.
The entire scanning phase takes place locally by exploiting the power of the device.