You are probably looking for one of these Samsung packages:
: Under normal conditions, this is a background process and does not have a user interface. You will typically only see it in a list of installed packages (under "Show system apps") or in system "dumpsys" reports. com.sec.facatfunction
: The name typically refers to "Factory AT Function," which is used by Samsung for automated internal testing and factory-level diagnostic commands (AT commands) [3, 4]. You are probably looking for one of these
: It is a legitimate, safe Samsung system service. It is not malware or spyware. Android Internals: A Confectioner's Cookbook Usage in "Reports" 4]. : It is a legitimate
adb shell dumpsys package <package_name>