This file is a harmful and undesirable program. Probably virus. It's recommended to delete it.
What is SOS.exe Windows startup process
File name: SOS.exe
Program name: SOS
Description: PHILIS VIRUS
Information added by: ssss89s at 25 December 2008
Hint: If sos.exe file is a virus or trojan, we recommend to use a antivirus software or registry cleaner.