Recognizing Malware

Hello everybody

lately I'm experiencing obtrusive advertising popups, so after searching in my downloaded app list and found nothing, I installed "360 security" and found some apks that are listed as malware.

These apks are actually quite suspicious, so I froze them waiting for an accurate research.
In fact after searching the internet I haven't found nothing so I suspect these apks are malware

Battery control (com.sys.battery.control)
Live wallpaper (com.gl.live.wallpaper)
System Certificate (com.android.system.certificate) [I'm not sure about this one so I haven't frozen it yet]
music provider (com.android.music.helper)

The thing these apks have in common is that they all have the same icon.

I haven't installed anithing outside google Play store, so the causes are two IMO:

1. they have been installed as system apps via an app downloaded via play store
2. browsing the web via firefox

if this is true there's a bad security issue that needs to be fixed.

I use an Xperia L, android 4.2.2 stock rom, rooted