Everyday before sleep, I usually turn off wifi,bluetooth,all unwanted application. And I used task manager to kill unwanted program running and go to Task managers and free up the RAM. Usually when I awake on the morning, I have similar battery power left before I goes to sleep. BUT today morning, my device battery all drained up completely, and I charge up the battery and check what causing the excessive power usage. I go to Setting>About device>battery usage. I notice Android system using 35% power over night. And I check which application running on the background and I see all these things list running over night and it scares me to hell. Included packages: Perso Security storage DRM content EncryptApp PopupuiReceiver Software update VPN Services Error Status bar Bluetooth Test Settings com.sec.android.app.Icdtest Factory Test Settings storage com.samsung.InputEventapp WlanTest Account and sync settings Setup Wizard Task manger MTP Application Service mode Android system License settings Google Backup Transport wssyncmlnps All these thing causing my android system used so much power over night today. And I was scary as hell what might cause these testing. Did I get a virus/malware? I didnt install any weird app the previous day. Today I charged back 100% power started the device, half hour idle time, android system goes down to normally 5% power usage. Seems normal for now, but I duno what causing all the testing running overnight? Help appreciated.