Backdoor.Autoupder - Removal

There are two ways to remove Backdoor.Autoupder

Use the Removal Tool
This is the easiest way to do this and is the recommend method. Symantec Security Response has provided a tool to remove infections of Backdoor.Autoupder. The tool is available here.

Manual removal
This should be used only if the tool does not work or if you cannot obtain it.

Here is an overview of the steps that are required to remove Backdoor.Autoupder (detailed instructions follow):

• Disable System Restore (Windows Me/XP only)
• Configure Windows to show all files
• Delete temporary files and empty the Recycle Bin
• Restart the computer in Safe mode
• Delete files that are detected as Backdoor.Autoupder
• Remove the values and keys that the Backdoor.Autoupder added to the registry

NOTE: Virus definitions dated prior to April 23, 2002, may detect this as Backdoor.Trojan or Downloader.Trojan.


To disable System Restore (Windows Me/XP only):
Windows Me and Windows XP users should temporarily turn off System Restore. This feature, which is enabled by default, is used by Windows Me/XP to restore files on your computer in case they become damaged. When a computer is infected with a virus, worm, or Trojan, it is possible that the virus, worm, or Trojan could be backed up by System Restore. By default, Windows prevents System Restore from being modified by outside programs. As a result, there is the possibility that you could accidentally restore an infected file, or that on-line scanners would detect the threat in that location. For instructions on how to turn off System Restore, read your Windows documentation or one of the following articles:

• How to disable or enable Windows Me System Restore.
• How to disable or enable Windows XP System Restore.

For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article Anti-Virus Tools Cannot Clean Infected Files in the _Restore Folder, Article ID: Q263455.

NOTE: Do not reenable System Restore until the removal is finished and you have restarted the computer in normal mode

To configure Windows to show all files:

1. Start Windows Explorer.
2. Click the View menu (Windows 95/98/NT) or the Tools menu (Windows Me/2000/XP), and then click Options or "Folder options."
3. Click the View tab.
4. Uncheck "Hide file extensions for known file types."
5. Do one of the following:
   • Windows 95/NT: Click "Show all files."
   • Windows 98: In the Advanced settings box, under the "Hidden files" folder, click Show all files.
   • Windows Me/2000/XP: Uncheck "Hide protected operating system files," and under the "Hidden files" folder, click "Show hidden files and folders."
6. Click Yes if you see a Warning dialog box.
7. Click Apply, and then click OK.

To delete temporary files and empty the Recycle Bin:

1. Double-click the My Computer icon on the Windows desktop.
2. Click once anywhere in the Address bar to select all the text.
   
   
   
   
3. Type %temp% and then press Enter:
   
   
   
4. The \Temp folder for the currently logged-on user appears.
5. Click Edit, and then click Select All. Press Delete, and click Yes if you are asked to confirm the deletion.
6. Close the My Computer window.
7. On the Windows desktop, right-click the Recycle Bin, and then click Empty Recycle Bin.

To delete files that are detected as Backdoor.Autoupder:

1. Obtain the most recent virus definitions. There are two ways to do this:
   • Run LiveUpdate. LiveUpdate is the easiest way to obtain virus definitions. These virus definitions have undergone full quality assurance testing by Symantec Security Response and are posted to the LiveUpdate servers one time each week (usually Wednesdays) unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, look at the Virus Definitions (LiveUpdate) line at the top of this write-up.
   • Download the definitions using the Intelligent Updater. Intelligent Updater virus definitions have undergone full quality assurance testing by Symantec Security Response. They are posted on U.S. business days (Monday through Friday). They must be downloaded from the Symantec Security Response Web site and installed manually. To determine whether definitions for this threat are available by the Intelligent Updater, look at the Virus Definitions (Intelligent Updater) line at the top of this write-up.
     
     Intelligent Updater virus definitions are available here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.
     
2. Restart the computer in Safe mode. All Windows 32-bit operating systems except Windows NT can be restarted in Safe mode. Read the document for your version of Windows.
   • How to start Windows XP in Safe mode.
   • How to start Windows 2000 in Safe mode.
   • How to restart Windows 9x or Windows Me in Safe mode.
3. Start Norton AntiVirus (NAV), and make sure that NAV is configured to scan all files.
   • NAV Consumer products: Read the document How to configure Norton AntiVirus to scan all files.
   • NAV Enterprise products: Read the document How to verify a Symantec Corporate antivirus product is set to scan All Files.
4. Run a full system scan.
5. Delete all files that are detected as Backdoor.Autoupder, Backdoor.Trojan, or Downloader.Trojan.
6. Use Windows Explorer to navigate into the Downloaded Program Files folder which is located in your Windows directory. If an ActiveX control named IO Class is found, delete this file.

To remove the values and keys that Backdoor.Autoupder added to the registry:

CAUTION: Symantec strongly recommends that you back up the registry before you make any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify only the keys that are specified. Read the document How to make a backup of the Windows registry for instructions

1. Click Start, and click Run. The Run dialog box appears.
2. Type regedit and then click OK. The Registry Editor opens.
3. Navigate to the following key:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
   Windows\CurrentVersion\Run
   
4. In the right pane, delete any of the following values that exist:
   
   SysScan C:\WINDOWS\bvt.exe
   ausvc C:\WINDOWS\ausvc.exe
   ABsr C:\WINDOWS\absr.exe
   mnsvc C:\WINDOWS\mnsvc.exe
   
5. Navigate to the following key:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\CLASSES\CLSID
   
6. Delete any of the following subkeys that exist:
   
   {6541B981-2E27-46B1-A2CC-8264A75B74FE}
   {868B015F-3515-44DB-B0AD-182CD058985E}
   {9A05FE9B-5B52-4D13-A77D-FA7C38557A8E}
   {BAE85C97-2CD4-45C3-A1ED-E4CEF7C6AA52}
   {C76BE992-2BC3-41A4-8B87-A8C01FE419A7}
   {F53C844A-D9C8-4E92-B923-C05B46C4A7E3}
   {FBE091E5-DF43-4FFB-AECC-7E3A3BC7B0D9}
   
   
7. Navigate to the following key:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\CLASSES\AppID
   
8. Delete the following registry subkey if it exists:
   
   {8B034058-08B0-4CB3-B2E8-60238B4967F2}
   
9. Navigate to the following key:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\CLASSES\TypeLib
   
10. Delete the following registry subkey if it exists:
    
    {6D8B1B74-4AB8-473B-B479-253FA1936802}
    
11. Click Registry, and click Exit.

Restart the computer and run a full system scan. Reenable System Restore if running Windows Me/XP.

Technical Details