I've had some strange PC problems over the last 6 weeks or so. Initially I thought it was a software problem, but now I'm beginning to think I've been infected. The problems appear to be related to https and secure connections, though the problems vary in severity / type.
The first sign was that Outlook constantly crashed. I traced this down to an Exchange connection (as opposed to pop3 accounts which worked fine). Then my VPN crashed on startup. Then my browser wouldn't serve https pages. They just gave me ERR_TIMED_OUT after 2 mins or so. (One example - my bank's http home page would load, but when I tried to login to online banking, that page wouldn't). More details here fwiw.
I ran MBAM, adwcleaner, SuperAntiSpyware, JRT and ESET online scanner. I didn't see anything particularly bad in there, but that appeared to fix the problem. Until a week later I began having trouble again. Just Outlook this time. Browser and VPN worked fine. Ran the tools again. All good. A week later VPN wouldn't work again and couldn't get https in the browser. But Outlook was OK.
This pattern has been repeated with variations again and again. The https browser problem varies - sometimes I can't get https pages at all, other times they're just very slow loading.
Today I thought I would try some more aggressive cleaning. I downloaded some tools I hadn't tried before like ComboFix and TDSSKiller - I thought I would try EVERYTHING. JRT seemed to run ok (although at the beginning it always gives me the message "cannot update, unable to ping"). When I tried to launch adwcleaner, it wouldn't run (just got the spinning circle forever). Same for rkill. I changed the name of the rkill.exe file to something random. That then ran. I tried the same trick with adwcleaner, but that didn't work.
It's driving me mad, going round in circles, and I'm a bit out of my depth. Would anybody be able to recommend a productive way forward?
Win 7 Professional with Service Pack 1
I just ran TDSSKiller - that has come up with 0 threats. I also noticed that I am no longer able to Set Default Programs / File Associations in Windows.
Edited by mhl, 13 April 2015 - 07:18 PM.