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Possible virus downloading large amounts of data in background


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#1 mattmizer

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Posted 07 January 2014 - 08:13 PM

The situation is as follows: I've got a computer that doesn't show particularly high CPU usage, but multiple instances of explorer.exe spawn and take up lots of memory, up to 2BG of ram each.

Based on looking at the network traffic for this computer on my router it looks like it's connecting to web sites and downloading video files, .mp4 and .flv files. I'm assuming these files are being stored in ram by explorer.exe somehow and this is whats using up all the ram.

 

Internet explorer doesn't seem to work, most of the time it simply doesn't load web pages, so it's probably part of the infection or infected by the same virus.

 

Also while multiple instances of explorer.exe are running GPU utilization goes up to 100% as reported by process explorer, I'm not really sure why that is happening.

 

Unfortunately I've already tried running Malwarebytes, combofix, Eset's online scanner, Kaspersky's online scanner andTrend Micro's online scanner earlier today. Combofix deleted a couple of files but that's it, nothing else is finding anything, the problem seems to still be there tho. It looks like dllhost.exe and svchost.exe are probably involved because even in safe mode while the computer isn't doing anything at all these services will spawn and sometimes despawn and will respawn each-other if killed.



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#2 mattmizer

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Posted 08 January 2014 - 01:54 AM

Well eventually after looking at the IPs that it was connecting to using Wireshark. One of the IPs was 31.128.104.126. Searching that resulted in a page suggesting it was associated with the TR/Gamarue.A.99 virus. Searching that indicated that Avira actually would have some success finding and removing it.

 

Despite the fact that no other antivirus scans found any of these things avira found the following.

 
TR/Gamarue.A.99
e2h[1].htm - html/iframe.arx2
cpc[1].htm - js/iframe.el.2
vsvusgvu.exe - tr/kuluoz.a.87
costcoform_overland_park.exe - tr/kuluoz.a.87 trojan

 

As well as a bootrecord virus boo/cidox.b.

Avira was able to remove all the other viruses and I was able to find instructions on this site to use Kaspersky's TDSSKiller to remove the boot record virus and was successful there. After that everthing was mostly better except IE was having problems loading some pages. A quick restore/repair of IE's default settings seems to have fixed that. I'll be keeping my eye on the computer for a while to make sure there's no weird memory or GPU utilization, and I'll never know what sort of stuff that virus was up to in the background using up to 4gb of RAM with explorer.exe but at least it seems to be gone.


Edited by mattmizer, 08 January 2014 - 01:55 AM.


#3 HelpBot

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Posted 12 January 2014 - 08:15 PM

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