Oasis2Service appears to be installed by Sony with its Vaio messenger program. It apparently allows Sony to send you hints and tips on using your laptop. When I uninstalled the program, the Oasis2Service was removed as well.
Here is the description of the program and a link to Sonys site on it.
VAIO Messenger is a software utility that provides hints and tips about using your VAIO® computer. It also offers optional accessories that are compatible with your computer and available for purchase.
VAIO Messenger can be uninstalled through the operating system and can only be reinstalled by performing a C: Drive recovery or a full system recovery.