In literally thousands of folders and subfolders, I have files called "test.txt", which are always exactly 48 bytes, looking like this:
2 NUL 8 T 2 DLE 0 B 2 NUL 8 H 2 NUL 0 P
Or in hex:
320D0A200D0A380D0A540D0A320D0A10 0D0A300D0A420D0A320D0A200D0A380D 0A480D0A320D0A200D0A300D0A500D0A
Sometimes the files in folders I am working in change, typically once a day. Only the numbers ever change, the letters (T, B, H, P) and the NULL and DLE characters always stay the same.
I've been having this for a while on multiple computers, but my colleagues don't. The files exclusively seem to appear in folders that are part of some software project, but not restricted to any particular programming language (Python, Java, C#), IDE (Eclipse, Unity) or versioning control system (Git, SVN).
Finally, I find this issue impossible to Google on, because every other coding example uses 'test.txt' and adding 'in every folder', 'appear' or other search terms don't seem to help one bit :) I'm very sure that I myself have never created any services that constantly monitor my file system and leave mysterious pieces of text all over the place.
So I'm pretty clueless about what could be creating these files, and mildly worried that it might be a sign of some piece of malware. Does anyone have a clue what is making these files on my computer? Is Windows, a virus scanner or any legit piece of software known to do this? Any suggestions to find out what process is modifying the files?