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Am I infected? Ad-Aware shows a "Win32Backdoor.Small" infection (sometimes)


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#1 tobias.armstrong

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Posted 30 July 2009 - 10:48 PM

I can't tell if I am actually infected with anything. Can anyone help?

I run Norton 360 Premier Edition, and every couple of weeks run Ad-Aware and Spybot Search and Destroy.

Computer seemed a little on the slow side, so I ran an Ad-Aware scan - "full scan" not "smart scan"... It came up with a "Win32Backdoor.Small" infection. I let Ad-Aware perform the suggested actions to resolve - I rerun the scan and the same infection shows up. I also ran Spybot, as well as a full Norton scan - neither showed any problem. If I run a "smart scan" in Ad-Aware, it shows no problems.

Not sure if I actually have a problem, and if so how long I have had it - normally I run "smart scans" and not "full scans" in Ad-Aware...

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#2 quietman7

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Posted 31 July 2009 - 06:15 AM

mvps.org is no longer recommending Spybot S&D or Ad-Aware due to poor testing results. See here - (scroll down and read under Freeware Antispyware Products)

Further, most people don't understand Spybot's TeaTimer or how to use it and that feature can cause more problems than it's worth. TeaTimer monitors changes to certain critical keys in Windows registry but does not indicate if the change is normal or a modification made by a malware infection. The user must have an understanding of the registry and how TeaTimer works in order to make informed decisions to allow or deny the detected changes. Additionally, TeaTimer may conflict with other security tools which do a much better job of protecting your computer and even prevent disinfection of malware by those tools.

More effective alternatives are Malwarebytes Anti-Malware and SUPERAntiSpyware Free.

Please download Malwarebytes Anti-Malware (v1.39) 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.

-- If Malwarebytes Anti-Malware results in any error messages, please refer to Fixes for common problems and Error Codes. Some issues with errors can be related to malware infection but others are not.
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#3 tobias.armstrong

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Posted 08 August 2009 - 09:03 AM

Thank you so much for your reply! Sorry to be long in getting responding - I was out of the mix for a bit...

I will be removing Spybot and Ad-Aware from the mix, and substituting for the two programs you list above!!

I installed and ran MBAM as instructed above with no problems. It did find some malware, and seems to have been able to remove it. I ran a second scan after the removal and it came up clean.

Thanks again for your help!!!

Below is the MBAM log showing the malware:

Malwarebytes' Anti-Malware 1.40
Database version: 2577
Windows 5.1.2600 Service Pack 3

8/8/2009 1:52:45 AM
mbam-log-2009-08-08 (01-52-45).txt

Scan type: Quick Scan
Objects scanned: 95226
Time elapsed: 3 minute(s), 56 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 5
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 1
Files Infected: 2

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
HKEY_CLASSES_ROOT\Interface\{0d1dbfee-0c43-4223-8b3e-a56fb3c5c87d} (Trojan.FakeAlert) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\AppID\{0d1dbfee-0c43-4223-8b3e-a56fb3c5c87d} (Trojan.FakeAlert) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{546d0bb7-6894-48d2-89eb-dfabf5e4ec7d} (Spyware.Banker) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\AppID\QWProtect.dll (Rogue.AntiVirus1) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\AV1 (Trojan.Agent) -> Quarantined and deleted successfully.

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
C:\Program Files\GbPluggin (Trojan.Agent) -> Quarantined and deleted successfully.

Files Infected:
C:\Program Files\GbPluggin\gbiehdst.dll (Trojan.Agent) -> Quarantined and deleted successfully.
C:\Program Files\GbPluggin\svchost (Trojan.Agent) -> Quarantined and deleted successfully.

#4 quietman7

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Posted 08 August 2009 - 02:37 PM

How is your computer running now? Are there any more reports/alerts, signs of infection or issues with your browser?
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#5 tobias.armstrong

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Posted 08 August 2009 - 03:27 PM

It seems to be running faster!! No ssues that I have seen so far...

#6 quietman7

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Posted 08 August 2009 - 03:45 PM

If there are no more problems or signs of infection, you should Create a New Restore Point to prevent possible reinfection from an old one. Some of the malware you picked up could have been backed up, renamed and saved in System Restore. Since this is a protected directory your tools cannot access to delete these files, they sometimes can reinfect your system if you accidentally use an old restore point. Setting a new restore point AFTER cleaning your system will help prevent this and enable your computer to "roll-back" to a clean working state.

The easiest and safest way to do this is:
  • Go to Start > Programs > Accessories > System Tools and click "System Restore".
  • Choose the radio button marked "Create a Restore Point" on the first screen then click "Next". Give the R.P. a name, then click "Create". The new point will be stamped with the current date and time. Keep a log of this so you can find it easily should you need to use System Restore.
  • Then use Disk Cleanup to remove all but the most recently created Restore Point.
  • Go to Start > Run and type: Cleanmgr
  • Click "Ok". Disk Cleanup will scan your files for several minutes, then open.
  • Click the "More Options" tab, then click the "Clean up" button under System Restore.
  • Click Ok. You will be prompted with "Are you sure you want to delete all but the most recent restore point?"
  • Click Yes, then click Ok.
  • Click Yes again when prompted with "Are you sure you want to perform these actions?"
  • Disk Cleanup will remove the files and close automatically.
Vista users can refer to these links: Create a New Restore Point in Vista and Disk Cleanup in Vista.
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