Macbook Pro running Yosemite 10.10.5, retina, early 2013 model
Processor speed 3Ghz
Context: I did a format/erase and clean OS X install (via internet recovery) on my Macbook 1 day ago and only restored music/pictures from a Time Machine backup, not any of the profiles, settings or applications as I definitely had some sort of malware/trojan/adware (login on a social networking site from a country I have not set foot in) on it and it would've most likely been lurking in one of those folders (this I was recommended by someone else).
Not thinking too much of it, I trashed it and didn't jot down any specific details (e.g. Chrome web store web link, or a screenshot of it). However, I tried searching for it in the web store by myself and I cannot find it. So now I'm worried that I have malware on my computer.
I haven't noticed anything obviously suspicious with my Chrome activity - I don't have redirects, pop ups or anything and there were no other extensions in my extensions list that I didn't install myself. However, I did have a couple of ERR_CONNECTION CLOSED messages and other similar ones last night.
Edit: I know that a couple of extensions come pre-installed in Chrome when you open it for the first time. I trashed those right away as I don't utilise any of them, and the extension I'm worried about was not in this original bundle when I opened Chrome for the first time. It appeared in my extensions list overnight. Would it still be legit in this case?
I did some scans; neither Avast or MalwareBytes for Mac found anything.
Now I'm not entirely sure what to do...
Edited by realityparty, 01 September 2015 - 10:40 PM.