Yesterday I installed a fresh antivirus after my subscription on the last ran out. The version I had up to yesterday (though the subscription had been expired for 5 days) was McAfee Livesafe. The version I'm now on is McAfee Total Protection. I'm not sure if it makes a difference but it seems like I should mention.
It ran a scan and flagged up two things as JTISuspect!/131076. Both were files that had been on my computer for a while, third-party plugins for a fractal creation program called Apophysis, which I have been using without issue for a number of months. I downloaded these particular plugins last month, from a popular user in the fractal community on Deviantart. I've had a look at the comments on the link, and one other user reported their AV flagging a virus in the folder.
I also have Malwarebytes (the free version), and have run a number of scans with both that program and the older version of McAfee. Neither flagged up anything. Yesterday however, just before I uninstalled the older version of McAfee, I noticed it had removed 2 trojans in the last month. However I couldn't find where to get more information on it.
I scanned the folder where these plugins originally came from. Oddly, McAfee did not, at the first general scan, flag up anything in this folder, but when I scanned it this time, it removed all but one of the .dll files.
I ran a full scan with Malwarebytes, and nothing else has been flagged up. I also ran a full scan with McAfee, and it found nothing at all.
As to potential malware delivery methods I know of, I use an adblocker (ublock origin) and keep my browser (chrome) up to date, as well as my OS (Windows 8.1) and I don't download things from sources I don't trust, nor open attachments in spam emails. I had downloaded plugins from the same source with no issue. That said, I use Sky Go, which I need to use Internet Explorer for, as Chrome and Firefox are not supported. Up until yesterday (when I worked out how to change it), the homepage was the BT homepage, which has ads, so if an ad server was compromised I may have got something from there. Other than that, I don't know how I can have got any malware.
Is this a false positive, or something to be concerned about? Where should I go from here?
I'd be truly grateful for any advice. Thanks!