I've frequently visited this site to read up on solutions when I've had to fix problems for people, but I've never had to post before.
Yesterday I received an email from a free-to-play game company (cryptic Studios for Star Trek Online) stating that they had blocked an attempt to access my account (due to different I.P. address like what SteamGuard does). I looked up the I.P. address and it turned out the be Chinese. Due to this I quickly logged on and changed my password. However I haven't touched this game in months (probably since last November if I had to guess), so I'm rather surprised about such a message now. I don't care about the game account at all, I just want to keep the rest of my data safe.
My immediate reaction was that it was due to malware, so I ran Adwkiller, TDSSkiller, full MSE scan and full MBAM scan. The only one that turned up anything was MBAM which turned up one half downloaded PUP installer in Chromes temporary files (sort f thing that happens if one mis-clicks on a link and then clicks cancel when the 'Choose download location' window pops up. So there was no installed malware that could be detected by any of these decent pieces of kit. As I was thinking about it afterwards, I realised that I can't believe that it could be a keylogger or anything as I haven't used the games in so long, nothing was detected by the AVs and I must have typed several hundred megabytes of text since then.
To be safe I changed my important email passwords and linked the game account to an email account that contains nothing other than spam I don't want on useful accounts. I concluded that as there's nothing obvious I can see wrong with my computer that the problem must be at the company's end or somewhere in between the two. What are your thoughts on this?
Bonus question: I've been using MSE as my main AV for years now and the only malware I've ever had was a browser hijack via the hosts file (due to my own stupidity). I always keep an up to date copy of MBAM ready to run, if I detect a problem on mine or someone else's machine. Should I be using a different AV, possibly better than MSE?