[Unable to remove "android/trojan.ztorg.a" this trojan]

I solved (I think) a similar problem a couple of days ago on a 4.2.2 Android Jellybean low budget rooted phone. I followed a procedure similar to the one found here: http://forum.xda-developers.com/general/general/fix-monkey-test-time-service-virus-t3194907

 

and I removed the following files

/system/xbin/.gap

/system/xbin/.gap.a

 

/system/app/.gma.apk

/system/app/.gmp.apk

/system/app/.gmtgp.apk

 

/system/bin/.gap

 

/etc/install-recovery.sh (a file install_recovery.sh wasn't related to the virus)

The names of the Viruses in the case I describe were: TimeService, SecurityService and FirewallService

 

Your tablet has Kitkat 4.4.2. The phone had 4.2.2.

 

If your tablet is rooted and you install (from PlayStore) Root Browser from JRummyApps, Busybox Installer from JrummyApps and Terminal Emulator from Jack Palevich

you may be able to remove (for example)  system/priv-app/.gma.apk with the following commands in Terminal Emulator

 

adb shell

su

mount -o remount,rw /system

cd /system/priv-app

chattr -iaA /system/priv-app/.gma.apk

rm /system/priv-app/.gma.apk

See also the link on xda-developers.

I have no relationship with Malwarebytes. Ask for a second opinion before doing anything of those I describe because there are dangers from human errors.