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Do I Have a Virus?


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#1 alorac

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Posted 19 May 2010 - 10:43 AM

Avast!, an antivirus program, reports that the file C_28594Z.dll in c:\windows32 contains a virus, but cannot remove it. Microsoft Security Essentials, when scanning that same file, finds no problem. I tried to remove or rename the file, but failed because it is a system file, which is hidden, and read only. I am running Windows XP SP3.

What do you suggest I do? How do I determine what the file is and whether or not it contains a virus? How can I remove it or rename it?

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#2 boopme

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Posted 19 May 2010 - 11:22 AM

We should double check it before we take action.

Lets' upload this file for a second opinion on what it actually is..

Please make sure that you can view all hidden files. Instructions on how to do this can be found here:
How to see hidden files in Windows

Please click this link-->Jotti

When the jotti page has finished loading, click the Browse button and navigate to the following file and click Submit.
suspect.file

Please post back the results of the scan in your next post.

If Jotti is busy, try the same at Virustotal: http://www.virustotal.com/


NOTE:
For submission to a specific anti-virus vendor see Submitting Virus Samples: How to Submit a Virus.


Next run MBAM (MalwareBytes):

Please download Malwarebytes Anti-Malware (v1.46) and save it to your desktop.alternate download link 1
alternate download link 2
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. Temporarily disable such programs or permit them to allow the changes.
  • 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 definition updates, manually download them from here and just double-click on mbam-rules.exe to install.
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. Be sure to post the complete log to include the top portion which shows MBAM's database version and your operating system.
  • Exit MBAM when done.
Note: If MBAM encounters a file that is difficult to remove, you will be asked to reboot your computer so MBAM can proceed with the disinfection process. If asked to restart the computer, please do so immediately. Failure to reboot normally (not into safe mode) will prevent MBAM from removing all the malware.
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#3 alorac

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Posted 20 May 2010 - 07:43 AM

Thanks for your reply.

Jotti's says file is empty. 0 bytes.
Virustotal says the same.
My computer says the file is 100KB.

What do I do now? I would like to try removing or renaming the file if I could figure out how to do so. The file is hidden, system, read only. I tried to change the attributes in a dos window but failed.

#4 boopme

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Posted 20 May 2010 - 09:10 AM

OK< please run MBAM and see if it removes it.

If it survives we can use MBAM's FileAssassin feature.

Open MBAM again.Click the More Tools tab and then the Run Tool button
Now browse to the file(s) we want to remove using the drop down box next to Look in: at the top.
Locate the file(s), click Open.
You will be prompted with a message warning: This file will be permanently deleted. Are you sure you want to continue?. Click Yes.
If removal did not require a reboot, you will receive a message indicating the file was deleted successfully, however, I recommend you reboot anyway.

Caution: Be careful what you delete. FileAssassin is a powerful program, designed to move highly persistent files. Using it incorrectly could lead to disastrous problems with your operating system.


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