Hi Well, im having the same problem since 3 months now. I install the generic ROM to my galaxy y, root the phone and install some apps but after a week of installing everything I browse the files in my sd card and this weird files with symbols and odd file extensions appear in it. I have tried deleting them and some are deleted but others are left behind, although it says that they have been deleted and in minutes they have produced the same amount of strange file that there were in the beginning(Deleted both, in the Android File Manager and in the computer). Also completely formated my sd with various special softwares, and completely restored my android to factory state and installed the ROM again. Spoiler Also the strange files always appear in just one folder and don't spread to the others, although they infect the files in the folder, and in each occasion that I found them, they are in different folders. Help!!!