⭕SCR

SCR files are screensaver files used by Windows for energy saving purposes. Screensavers are programs that execute after a configurable time of user inactivity and consists of Portable Executable(PE) files with a .scr file extension. The Windows screensaver application scrnsave.scr is located in C:\Windows\System32 , and C;\Windoww\sysWOW64\ on 64-bit Windows systems. The screensaver settings are stored in the Registry (HKCU:\Control Panel\Desktop\) and can also be manipulated for persistence.

This techniques is useful for persistence as well.

see screensaver hijack section.

SCR extensions are also executables on a Windows machine we can go a bit more farther and try to make this more credible program to execute.

simply create a PE payload and change the extension from .exe to .scr