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TR/Dropper.Gen trojan infection


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#1 redbird14

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Posted 01 December 2009 - 01:48 PM

I have contracted a TR/Dropper.Gen infection. I've attached dds.scr & RootRepeal logs as well as what feedback I get from my copy of Avira Antivir Personal.

Symptoms noted so far are:

- Every 5-6 minutes, Avira pops up a warning (see AVrprt2.png attached). The svchost.exe file referenced (AVrprt.png) is gone when I open the folder referenced. I've been deleting the folders. The name of the folder changes with every instance, but its always 4 characters with a .tmp extension.
- Google/Bing searches are redirected.
- Every nth page I open in my browser (Firefox) is accompanied by a 2nd tab opening directed to some ad. Firefox's WOT add-on consistently shows red for these pages. I'm not sure what 'n' is. It seems to be about every 6th or 7th page I open. 'Open' can be in a new tab or just going to a new page in an existing tab. WOT (Web of Trust) is a Firefox add-on that rates websites for safety/content. Green is good, red is bad.

I have run Malwarebytes both complete & quick scans; Avira's complete scan and SuperAntiSpyware's complete scan. All have come up clean.

Any guidance anyone can provide will be much appreciated!!

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#2 redbird14

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Posted 02 December 2009 - 08:16 AM

Additional Symptoms/Partial Fix

I mentioned that this trojan triggers Avira every 5-6 minutes by inserting a svchost.exe file into a folder, the name of which varies with each insertion. These folders reside in C:/Windows/Temp on my primary/system drive. The Temp sub-folder is not native. The trojan creates it. In addition to the folders, the Temp sub-folder contained about a dozen .tmp files labeled JETnnnn where nnnn is an apparently random 4 digit number. I was unable to delete these through normal means. However, through Process Explorer, I was able to get rid of them and then the entire Temp sub-folder. This stopped the trojan triggering Avira but did not stop the search engine redirection nor the opening of random pages in Firefox. Also, on a reboot, the Temp folder and the JETxxxx.tmp files reappeared. So on a reboot, I open up Process Explorer & get rid of them. This stops Avira from popping up every 5-6 minutes but nothing else.

I also searched my registry (using RegAlyzer, from the same folks who put SpyBot together) looking for any keys that were added from a week before this all started happening and I could find nothing. What keys it came up with were legitimate. I'm guessing the trojan can set any date it wants prior to the date it installed itself and given that, I don't know what to search for.

So the trojan is hiding out somewhere but I can't figure out where.

#3 redbird14

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Posted 02 December 2009 - 11:26 PM

Another clue possibly.

The trojan may be hiding out somewhere in one of the components (.dll, .exe) of my tuner card/pvr. I have a Hauppauge tuner card & use their software to schedule & record with. The TEMP file mentioned in my previous post & the JETnnnn.tmp files are not only created at boot-up time but also when a scheduled recording launches. As with other instances, I can use Process Explorer to get rid of them. I didn't grab enough details of what exact process the .tmp files were associated with - I was too focused on getting rid of the JET files - but tomorrow, when the next scheduled recording launches, I will.

I'm reluctant to uninstall & reinstall the Hauppauge drivers & software. Their uninstall routine is flawed and subsequently the re-install process more often than not fails. It can take an entire weekend just to install one of their upgrades. But if this is what is needed to get rid of the trojan, I will do that. But I'd like to know that there's a good probability that will solve the trojan problem before attempting an uninstall/reinstall of the Hauppauge package.

I'm probably nitpicking but the 'nnnn' in the JETnnnn designator represents a hex # not a digit/decimal # as I previously indicated.

#4 Elise

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Posted 14 December 2009 - 04:21 PM

Hello ,
And :( to the Bleeping Computer Malware Removal Forum
. My name is Elise and I'll be glad to help you with your computer problems.


I will be working on your malware issues, this may or may not solve other issues you may have with your machine.

Please note that whatever repairs we make, are for fixing your computer problems only and by no means should be used on another computer.

You may want to keep the link to this topic in your favorites. Alternatively, you can click the button at the top bar of this topic and Track this Topic, where you can choose email notifications. The topics you are tracking are shown here.
-----------------------------------------------------------
If you have since resolved the original problem you were having, we would appreciate you letting us know. If not please perform the following steps below so we can have a look at the current condition of your machine.

If you have not done so, include a clear description of the problems you're having, along with any steps you may have performed so far.

If you have already posted a DDS log, please do so again, as your situation may have changed.
Use the 'Add Reply' and add the new log to this thread.

We need to see some information about what is happening in your machine. Please perform the following scan:
  • Download DDS by sUBs from one of the following links. Save it to your desktop.
  • Double click on the DDS icon, allow it to run.
  • A small box will open, with an explanation about the tool. No input is needed, the scan is running.
  • Notepad will open with the results.
  • Follow the instructions that pop up for posting the results. Post both logs (no need to zip attach.txt).
  • Close the program window, and delete the program from your desktop.
Please note: You may have to disable any script protection running if the scan fails to run. After downloading the tool, disconnect from the internet and disable all antivirus protection. Run the scan, enable your A/V and reconnect to the internet.

Information on A/V control HERE


Please download GMER from one of the following locations and save it to your desktop:
  • Main Mirror
    This version will download a randomly named file (Recommended)
  • Zipped Mirror
    This version will download a zip file you will need to extract first. If you use this mirror, please extract the zip file to your desktop.
  • Disconnect from the Internet and close all running programs.
  • Temporarily disable any real-time active protection so your security programs will not conflict with gmer's driver.
  • Double-click on the randomly named GMER file (i.e. n7gmo46c.exe) and allow the gmer.sys driver to load if asked.
  • Note: If you downloaded the zipped version, extract the file to its own folder such as C:\gmer and then double-click on gmer.exe.

    Posted Image
  • GMER will open to the Rootkit/Malware tab and perform an automatic quick scan when first run. (do not use the computer while the scan is in progress)
  • If you receive a WARNING!!! about rootkit activity and are asked to fully scan your system...click NO.
  • Now click the Scan button. If you see a rootkit warning window, click OK.
  • When the scan is finished, click the Save... button to save the scan results to your Desktop. Save the file as gmer.log.
  • Click the Copy button and paste the results into your next reply.
  • Exit GMER and re-enable all active protection when done.
-- If you encounter any problems, try running GMER in Safe Mode.

-------------------------------------------------------------
Please be patient and I'd be grateful if you would note the following
  • The cleaning process is not instant. DDS logs can take some time to research, so please be patient with me. I know that you need your computer working as quickly as possible, and I will work hard to help see that happen.
  • Please reply using the Add/Reply button in the lower right hand corner of your screen. Do not start a new topic.
  • The logs that you post should be pasted directly into the reply. Only attach them if requested or if they do not fit into the post.
  • Unfortunately, if I do not hear back from you within 5 days, I will be forced to close your topic. If you still need help after I have closed your topic, send me or a moderator a personal message with the address of the thread or feel free to create a new one.
In the meantime please, do NOT install any new programs or update anything unless told to do so while we are fixing your problem

If you still need help, please include the following in your next reply
  • A detailed description of your problems
  • A new DDS log (don't forget attach.txt)
  • GMER log


Please give me some time to review your logs and take the steps necessary with you to get your machine back in working order clean and free of malware.

Thanks and again sorry for the delay
.

regards, Elise


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#5 Elise

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Posted 19 December 2009 - 03:36 AM

Due to lack of feedback, this topic is now closed.

If you are the original topic starter and you need this topic to be re-opened, please send me a PM.

Everyone else, please start a new topic.

regards, Elise


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