Yeah this is a sign of malware on your android device. It can only be removed by two ways: Either you remove it on your phone(it must be rooted) or u connect your phone to a pc and enable hidden options. But i think its easier doing it on phone.
First, locate the apps on your android device and uninstal "Security Service". After that, swipe left to show the running processes, there you should find "Firewall service", click on it. Force stop and disable it.
On your phone, make sure you have either x-plore or Es File explorer installed. On either of the two, open the Tools menu and mark "show hidden files" then select Root explorer ( so as to grant root permission). select "grant/yes" when it shows a pop message. By now it should be showing all the folders on your sd
Now leave sd and open phone memory/device memory
On your device memory, click system>>priv-app. Inside this folder, the first 2 hidden files is your malware. Before deleting the files, try to install it so has to confirm you are not deleting the wrong files( one should be security service and the other should be firewall service). After deleting it, reboot your phone and its back to normal.
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