[Edit] Apologies for spelling mistake in my post title. I don't think I can edit that...
Windows 7 Home Premium Service Pack 1, Automatic Updates (so I presume the system is up to date) running Avast Free antivirus (fully updated with latest definitions)
Hello - I hope someone might be able to help me. Several weeks ago I downloaded and installed what I thought was a legitimate program for driving a new digital microscope that I use for my work. I'm usually a very cautious browser, and only download from legitimate sites, but this time it looks like I goofed. The installer made the usual offers of adware, which I declined, but then went ahead and installed a bunch anyway. The immediate symptoms were attempted browser hijacks (some successful, some blocked by Avast). I cleaned up what I could manually (including uninstalling the digital microscope program), but there was at least one adware program that would not fully uninstall through add/remove programs. Over the next week or so I looked up what to do about it, and eventually ran through the malware removal guide listed here: https://www.reddit.com/r/techsupport/comments/33evdi/suggested_reading_official_malware_removal_guide/. The tools found a bunch of things (all apparently adware, nothing nasty) and removed them. After three cycles through the malware tools, everything was coming up clean (no reported threats/infections).
However, since that time, I get periodic Avast "threat detected" warnings (this happens at least every time I wake my computer up, and at intervals between 30 min and several hours thereafter). These only happen on one computer - other computers I have running Avast don't do this. Avast appears to be blocking attempts by my computer to connect to a range of websites. Example text from one such warning reads:
The websites and exact URL are different each time, but the common theme is that they appear to be trying to download a .dll file.
Examples of the last few URLs are:
The tools I have used to date (all run as administrator, and in roughly the order run) are:
Avast full system scans, and boot-time scans
MalwareBytes Anti Malware
Junkware Removal Tool
Hitman Pro (trial version - no threats found so I did not need to start a 30 day trial)
The latter found a bunch of tracking cookies and flagged one .exe file as suspicious. That .exe file is in my downloads folder, and as it turns out is part of the installer package for the original digital microscope program that I believe started this whole problem in the first place (which I still have in my 'Downloads' folder if anyone needs to look at it). However, Hitman Pro did not find any threats, [Edit] and all the other malware tools come up clean.
So - to sum up - I downloaded and installed a dodgy file and either that file, or the installer, infected me with a bunch of adware. I successfully removed apparently everything, all malware and junkware and antivirus tools are coming up clean, but I am STILL getting Avast warnings about attempts by my computer to contact dodgy websites to download a .dll. It looks like I still have stealthy infection somewhere on my system but I don't know what or where. Can anyone help me with what I should do next?
Edited by Dancing_Bear, 20 June 2015 - 01:27 AM.