With an expansive list of malicious apps being discovered as making their way into the Google Play store, many users are quickly learning that trust is a dynamic state. So to help with any apps that get identified as being harmful to you and your device, the following is a recommended free protection.
First, make sure you’re downloading all apps from trusted sources like the Google Play Store. Google Play Protect, which scans all apps for malware before and after you install them, is automatically enabled on your device. To see more about Play Protect:
- Open your device’s Google Play Store app
- Tap Menu
> Play Protect icon
> Play Protect icon 
For more information, visit the Help Center.
Source: https://www.android.com/play-protect/