When I installed the SSD I also installed Samsung Magician.
After a few weeks up popped a notice re. a new version. I decided to try it (going from v4.* to v5.1). Of course, the new, super-dooper interface is crap - nowhere near as flexible or useful as the old one - so I uninstalled it and re-installed v4.
Since then, it won't start unless it has access to the web, seems to do things even though I can't see any process and does long uploads. There seems to be no other sign or detectable presence of malware.
Has anyone else had anything like this? It's a useful utility but is being too intrusive.