A few days ago my Google account was hacked. Well, someone in Sri Lanka was trying to access it, so I assume at least minimum penetration was achieved. Since that date, I have been seeing a notification flash across my tablet's status bar, but nothing shows in the menu. This flash is occasionally accompanied by a "ring" notification sound, though I do not have that tone set for anything (that I can find).
I have tried running Lookout and Avast to see if there is anything obviously wrong, but they keep coming up "No malicious files". I also tried to go through my running apps to see if anything looked out of place, but it all looked normal to me. I'm at a loss as to what to do next. Any suggestions?