Hello, I am glad to be using this forum with all the experts around . I hope you can shed some light on my situation.
I don't want to waste your time so let me make this as quick as possible.
09-01-2017 (2 days ago) I clicked various suspicious links someone had posted on a forum.
I then closed down the tabs of those links but I did not close Firefox down.
Around 2-3 minutes after closing the tabs my Firefox changed its theme to default (from black to the usual white or bluish whatever). I had made no such changes nor been notified, it just happened out of the blue.
My thinking: maybe it was just a Firefox software update, as odd as it is, so I checked my Firefox version: 55.0.3 (32bit).
This Firefox version was supposed to have dropped around 25th of August, so surely it cannot explain this weird phenomenon?
Did any of you receive a Firefox update on the 1st of September?
I then immediately put my trusty but crappy Comodo Firewall 10 to suspicious mode, and as usual it went NUTS by giving me popups from every benign system process and software installed, because Comodo is a trusty pile of C.
Anyway, I was forced to shutdown my PC via holding the start button on the box in until it turned off, and start in safe mode. As much as I did not want to restart my PC because it could worsen an infection, Comodo forced me to do it (thanks!). Comodo had simply spazzed out so much that I had no chance of starting it, it even blocked explorer.exe (because the screen was black on the start).
I finally resolved the trusty Comodo Firewall crap situation after spending many hours in the late morning without sleep.
I tried checking network activity with Comodo and found nothing suspicious. I did a file scan and found no new unrecognized files.
I tried Hitmanpro 3.5 which is my second-in-line in case of an infection, but it detected nothing. I tried all scan options it has.
I ran gmer.exe but it detected all the false positives in the known universe as malware so I shrugged it off for a while.
I ran malwarebytes antivirus and malwarebytes anti-rootkit scans to no avail.
I then installed Avast and did a full system scan but again to no avail, no results. Now Avast is blocking gmer.exe from running (downloaded from official site) even if I turn off Avast's "protection" modules. Gee, thanks, might just be what I need in such a dire situation!
Here's the bottom line: the machine is pretty much asymptomatic, but I know there's an infection. I am not stupid, I know I clicked a sketchy link and the activity that followed makes it obvious.