Suspicious directory ".MySecurityData" in internal storage
Using the ls command, you can find out the owner (and group) of those directories. Following this with a ls on /data, and watching out for the same ownership, you should find only one hit, reveaing the package name of the corresponding app – which you then can use on the Google Play website to find the matching app (by placing the found package name after the id= part of the URL).

As access to the /data directory is restricted, the above commands must be executed with root privileges.