what is this directory in android 5.0 Using SD Maid, I was looking around with file explorer and came across this directory in the efs folder, and I have no clue what it is, if its malicious or not. Its the only directory in the efs folder with a name that isnt clearly defined. (like modem, data etc) I tried Googling the directory and file names but got nothing.
Device info: USC Samsung Galaxy S5 (SM-G900R4, Qualcomm, codename klte); rooted and slightly customized using hidden menu settings; software up to date.
This is how it appears in SD Maid:

/efs/U0BwJ04kmkmm-Bg7zUZgoEY7pn8_/zm0WY41Y7rpx3kcVTTDWeh8VFRU_  (size: 1.05kb, date 1/1/14)
/efs/U0BwJ04kmkmm-Bg7zUZgoEY7pn8_/qen2gEqW2A+OTD0KpoESJiYnrk_  (size:1.05kb, date 1/1/14)

I don't know, if anyone that has seen it before.
Samsung devices' EFS partition

It is a place that the device stores important data like WiFi and Bluetooth MAC addresses and your IMEI number (nv_data.bin).



What is EFS?


The EFS refers to a folder called EFS which can store information
like meid, imei, serial number, config, diag settings and radio
settings, etc in an encrypted format at the file system level stores.
So it is very neccessary for us to backup EFS before flashing ROMs.


How will you lose the EFS folder?


As far as I known, you always lose your EFS by mistaken operations.
For example, flash ROMs or wipe data using an uncorrect method. Even
wrong power on &amp; off ways like taking out the battery to force
shutdown as starting could corrupt your EFS, too. Rooting and
flashing ROMs usually have no influence on EFS data, but you know
everything can happen in the real word. There are some ways you can
check whether your EFS folder is lost: inputting *#06# on dialler,
going to settings/about phone/status or checking mac address.


What results if you lose the EFS folder?


The loss of the EFS folder may bring about an incredible disaster on
your device such as no imei information, base band unknown, no radios
and so on which mean your device will no longer be recognized by your
carrier.


How to back up the EFS folder?


There are too many tools you can use to back up the EFS folder. All
of them work in a similar way, so we will just introduce one tool
called Custom Recovery here. Everything has risks. we are not
responsible for  the following method. Please act with caution!
Bofore backing up the EFS folder you need make sure your Andriod
device is rooted. Then, install Custom Recovery on your device. Open
the Custom Recovery, select the Backup option, and go on select the
paritions containing EFS, then "Swipe to Back Up" to begin the backup
process.


Source