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Computer immediately deletes ComboFix


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6 replies to this topic

#1 Smedlow

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Posted 01 March 2009 - 10:33 PM

The computer I am working on was infected with Internet Antivirus Pro, iamfamous.dll (Trojan.Agent),gaopdxewmyqvpa.sys (Trojan.Agent),gaopdxppexrmql.dll (Trojan.Agent), Win32/VMalum.ENIQ,coolplay (Trojan.DNSChanger). These were found and removed by running a series of tools including Etrust Antivirus, Malwarebytes Anti Malware, Spybot Search and Destroy, Ad Aware, SD Fix, SuperAntispyware, Smitfraud, and RootRepealer.

These were all used in Safe Mode or not as per the recommendations for the specific tool. gaopdxewmyqvpa.sys (Trojan.Agent) and gaopdxppexrmql.dll (Trojan.Agent) continued to show up on several of the tools even after their noted removal.

I tried to download ComboFix to the computer but as soon as it was downloaded, it would be immediately deleted. Even a zip file containing it would be immediately deleted. I finally archived it with a WinRar and it would not be deleted, but when removed from the archive, it disappeared.

My last solution was to restart the computer in Safe Mode and try installing ComboFix which I did successfully. I ran the program and when it completed, the offending Trojans were gone and haven't shown up on a scan with any of the above tools since.

The computer is running normally with the exception that ComboFix is still being preventing from existing on the computer outside of Safe Mode. It seems that something in the explorer shell immediately deletes it similar to the way window prevents you from changing any of its protected files due to the File Protect feature that prevents changing important OS files.

ComboFix doesn't have any need to be on the computer at present, but something is obviously not quite right. Is this a policies issue? Any suggestions.

Thanks in advance.

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#2 garmanma

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Posted 02 March 2009 - 09:48 PM

To remove Combofix
  • Click on your Start Menu, then Run....
  • Now type combofix /u in the runbox and click OK. Notice the space between the "x" and "/".
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  • When shown the disclaimer, Select "2"
This will remove files/folders assoicated with combofix and uninstall it.
Mark
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#3 Smedlow

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Posted 03 March 2009 - 04:06 PM

Maybe I haven't been clear. I don't have any trouble removing ComboFix. The problem is that with window running in normal mode, the ComboFix install file will not exist on the computer. It is immediately and automatically deleted as soon as it is downloaded or un-archived. I suppose it could still be a virus, or maybe a policy issue. It appears to me that the designer of some malware created a mechanism to keep the tool that would remove it off the computer, i.e. ComboFix is deleted before it can be used. I was successful running it in Safe Mode. The problem is in Normal Mode.
Thanks

#4 DaChew

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Posted 03 March 2009 - 04:12 PM

Please download ATF Cleaner by Atribune & save it to your desktop.
  • Double-click ATF-Cleaner.exe to run the program.
  • Under Main "Select Files to Delete" choose: Select All.
  • Click the Empty Selected button.
  • If you use Firefox browser click Firefox at the top and choose: Select All
  • Click the Empty Selected button.
    If you would like to keep your saved passwords, please click No at the prompt.
  • If you use Opera browser click Opera at the top and choose: Select All
  • Click the Empty Selected button.
    If you would like to keep your saved passwords, please click No at the prompt.
  • Click Exit on the Main menu to close the program.
Note: On Vista, "Windows Temp" is disabled. To empty "Windows Temp" ATF-Cleaner must be "Run as an Administrator".

Please download Malwarebytes Anti-Malware (v1.34) and save it to your desktop.
alternate download link 1
alternate download link 2
If you have a previous version of MBAM, remove it via Add/Remove Programs and download a fresh copy.
  • Make sure you are connected to the Internet.
  • Double-click on mbam-setup.exe to install the application.
  • When the installation begins, follow the prompts and do not make any changes to default settings.
  • When installation has finished, make sure you leave both of these checked:
    • Update Malwarebytes' Anti-Malware
    • Launch Malwarebytes' Anti-Malware
  • Then click Finish.
MBAM will automatically start and you will be asked to update the program before performing a scan.
  • If an update is found, the program will automatically update itself.
  • Press the OK button to close that box and continue.
  • If you encounter any problems while downloading the updates, manually download them from here and just double-click on mbam-rules.exe to install. Alternatively, you can update through MBAM's interface from a clean computer, copy the definitions (rules.ref) located in C:\Documents and Settings\All Users\Application Data\Malwarebytes\Malwarebytes' Anti-Malware from that system to a usb stick or CD and then copy it to the infected machine.
On the Scanner tab:
  • Make sure the "Perform Quick Scan" option is selected.
  • Then click on the Scan button.
  • If asked to select the drives to scan, leave all the drives selected and click on the Start Scan button.
  • The scan will begin and "Scan in progress" will show at the top. It may take some time to complete so please be patient.
  • When the scan is finished, a message box will say "The scan completed successfully. Click 'Show Results' to display all objects found".
  • Click OK to close the message box and continue with the removal process.
Back at the main Scanner screen:
  • Click on the Show Results button to see a list of any malware that was found.
  • Make sure that everything is checked, and click Remove Selected.
  • When removal is completed, a log report will open in Notepad.
  • The log is automatically saved and can be viewed by clicking the Logs tab in MBAM.
  • Copy and paste the contents of that report in your next reply and exit MBAM.
Note: If MBAM encounters a file that is difficult to remove, you may be asked to reboot your computer so it can proceed with the disinfection process. Regardless if prompted to restart the computer or not, please do so immediately. Failure to reboot normally (not into safe mode) will prevent MBAM from removing all the malware. MBAM may "make changes to your registry" as part of its disinfection routine. If using other security programs that detect registry changes (ie Spybot's Teatimer), they may interfere or alert you after scanning with MBAM. Please temporarily disable such programs or permit them to allow the changes.

http://www.bleepingcomputer.com/forums/t/114351/how-to-temporarily-disable-your-anti-virus-firewall-and-anti-malware-programs/
Chewy

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#5 Smedlow

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Posted 04 March 2009 - 12:51 AM

Before you posted, I ran Spybot Search and Destroy and a number of registry keys with gaopdxewmyqvpa.sys in them were deleted. The actual files were not found.

I ran ATF-Cleaner as you suggested and followed it up with updated Malwarebytes Anti Malware which found no malware. I once again tried to download ComboFix and as soon as it completes, it is immediately deleted. I never even get to see the completed file.

More suggestions? Thanks.

Edited by Smedlow, 04 March 2009 - 12:52 AM.


#6 DaChew

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Posted 04 March 2009 - 01:04 AM

That would seem to indicate this is a very serious infection, we are not trying to help you to get combofix to run

Would you try to go thru the steps to prepare for the HJT forum, there you can receive the needed advise by trained experts to deal with an infection like this.

http://www.bleepingcomputer.com/forums/f/22/virus-trojan-spyware-and-malware-removal-logs/

If you cannot produce a log maybe we can offer some suggestions
Chewy

No. Try not. Do... or do not. There is no try.

#7 Orange Blossom

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Posted 04 March 2009 - 06:43 PM

Hello Smedlow,

Now that you have a log posted here: http://www.bleepingcomputer.com/forums/t/208249/gaopdxewmyqvpasys-and-others/ you should NOT make further changes to your computer (install/uninstall programs, use special fix tools, delete files, edit the registry, etc) unless advised by a HJT Team member, nor should you continue to ask for help elsewhere. Doing so can result in system changes which may not show in the log you already posted. Further, any modifications you make on your own may cause confusion for the helper assisting you and could complicate the malware removal process which would extend the time it takes to clean your computer.

From this point on the HJT Team should be the only members that you take advice from, until they have verified your log as clean.

Please be patient. It may take a while to get a response because the HJT Team members are EXTREMELY busy working logs posted before yours. They are volunteers who will help you out as soon as possible. Once you have made your post and are waiting, please DO NOT make another reply until it has been responded to by a member of the HJT Team. Generally the staff checks the forum for postings that have 0 replies as this makes it easier for them to identify those who have not been helped. If you post another response there will be 1 reply. A team member, looking for a new log to work may assume another HJT Team member is already assisting you and not open the thread to respond.

If after 5 days you still have received no response, then post a link to your HJT log in the thread titled "Haven't Had A Reply In Five Days?".

To avoid confusion, I am closing this topic. Good luck with your log.

Orange Blossom :thumbsup:
Help us help you. If HelpBot replies, you MUST follow step 1 in its reply so we know you need help.

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