I have a Galaxy Note (N7000) device running stock Android 4.1.2. I was browsing the internal storage and noticed a directory named ".MySecurityData", which contains one single directory "dont_remove", which contains multiple directories whose name consists of hexadecimal characters of length 32 (presumably MD5 hashes). All those 3rd level directories contain three directories - ".image", ".thumb", and ".video". A search through find command reveals that all the directories are empty containing no files.

Fact that the parent directory is hidden, directories have suspicious and obfuscated names, and a web search returns no results for ".MySecurityData" has raised concerns of some malicious activity.

Can anyone identify the application that may have created these directories? I'm a paranoid person and usually shy away from installing apps, and double check the ones that I'm installing.

There is also a SQLite3 file inside "dont_remove" (name is again in hexadecimal characters of length 15). A SQLite3 .dump on this file results in following:

PRAGMA foreign_keys=OFF;
CREATE TABLE android_metadata (locale TEXT);
INSERT INTO "android_metadata" VALUES('en_GB');
CREATE TABLE medias (_id INTEGER PRIMARY KEY,album TEXT, from_path TEXT, dest_path TEXT,thumb_path TEXT,file_name TEXT,file_type TEXT,file_ext TEXT,timestamp LONG,rotation INTEGER DEFAULT 0);


After a grep through dumpstate logs in /data/log, I noticed that the SQLite3 file was being accessed by com.domobile.applock. I've emailed the developer asking for more information.


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.

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After a grep through dumpstate logs in /data/log, I noticed that the SQLite3 file was being accessed by com.domobile.applock.

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AppLock is a legitimate app, considering that you opted to install it. It allows the device owner to assign a password to any app, settings area, or even Google Play thereby making it possible (for example) to lend the device to a young child without having to worry about the youth accessing those apps, settings or store. The app works as defined. I would therefore not consider the directories as suspicious, if they indeed are owned by AppLock as a previous post clarified.

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