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Hijacked svchost.exe, hijacked Firefox, previous Antivir Solution Pro infection

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#1 Walley


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Posted 27 August 2010 - 09:23 PM


About a month ago I managed to pick up an Antivir Solution Pro infection (fake scanner). This ensued with all the usual symptoms of a locked connection etc.

I eventually managed to remove this with a couple of manual steps (removing relevant registry entries and files) and a scan with Malwarebytes' Anti-Malware.

Things seemed smooth sailing for a while, but I noticed my internet connection occasionally seemed quite slow, and that Firefox was occasionally opening tabs to random locations - shopping addresses, advertising, etc. On occasion I've had attempts to open Google links also lead to such addresses.

Becoming suspicious in terms of the connection performance I installed NetLimiter to get a bit of a view on whether anything was hogging it up.

What I ended up discovering was that there was an instance of C:\Windows\System32\svchost.exe connecting to an external IP with a lot of outbound traffic - enough to completely bog down my connection. Below's a screenshot of the view of that in NetLimiter (shows the outbound address and the high traffic can be seen in the main window).

Posted Image

Of recent I've also had similar outbound connections with such high traffic through services.exe, and firefox.exe. For the time being blocking the specific connections via NetLimiter allows me to hold them down for one session, but it's very hands on as they continue to crop up. Also of note is that they always seem to be to the same IP range of 178.x.x.x and 204.x.x.x.

I've done a number of scans with various software, namely Malwarebytes' Anti-Malware, SUPERAntiSpyware, Avira, and Spybot. On occasion they each found a small number of infections and removed them, presenting clean scans afterwards. However the main symptoms here of outbound connections and a Hijacked Firefox continued.

Today I ended up running TDSSkiller (after finding TDSS fits the symptoms), which found one infection, listed as 'Win32.Rootkit.TDSS.tl3'. I had it remove this, which it seemed to do successfully - on a new scan nothing was detected, and since that I haven't been having any pop ups in Firefox - *yet*. I'll make an edit if that changes.

However the problem of outbound connections to shady places with high traffic continues.

How do I proceed :thumbsup:?

Thanks for your time in advance

Edited by Walley, 27 August 2010 - 09:26 PM.

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