Article ID: 903251
Article Last Modified on 12/12/2006
APPLIES TO
- Microsoft Windows Server 2003, Web Edition
- Microsoft Windows Server 2003, Standard Edition (32-bit x86)
- Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
- Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
- Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
- Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems
- Microsoft Windows XP Tablet PC Edition
- Microsoft Windows XP Professional
- Microsoft Windows XP Media Center Edition 2002
- Microsoft Windows XP Home Edition
- Microsoft Windows XP Professional for Itanium-based systems
- Microsoft Windows 2000 Server
- Microsoft Windows 2000 Datacenter Server
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Professional Edition
Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows registry
SYMPTOMS
You may experience one or more of the following symptoms on a Microsoft Windows Server 2003-based, Microsoft Windows XP-based, or Microsoft Windows 2000-based computer:
- The computer automatically restarts.
After you log on, you receive the following error message:
To see what the error report contains, click click here. When you click the click here link at the bottom of the message box, you will see error signature information that is similar to one of the following data samples.
Data sample 1BCCode : 00000050 BCP1 : f8655000 BCP2 : 00000001 BCP3 : fc7cc465 BCP4 : 00000000 OSVer : 5_1_2600 SP : 0_0 Product : 256_1
Data sample 2
BCCode : 0000008e BCP1 : c0000005 BCP2 : 00000120 BCP3 : fd28eaa4 BCP4 : 00000000 OSVer : 5_1_2600 SP : 0_0 Product : 256_1
- You receive one of the following "Stop" error messages.
Message 1Message 2
- Error messages that are similar to the following are logged in the System event log:
Notes
- The symptoms of a Stop error vary according to your computer's system failure options.
For more information about how to configure system failure options, click the following article number to view the article in the Microsoft Knowledge Base:307973 How to configure system failure and recovery options in Windows
- The four parameters that are inside the parentheses of the Stop error message vary according to the computer's configuration.
CAUSE
This problem may occur if the computer is infected with a variant of the HaxDoor virus.
The HaxDoor virus creates a hidden process. Additionally, the virus hides files and registry keys. The executable file name of the HaxDoor virus may vary, but the file name is frequently Mszx23.exe. Many variants of this virus put a driver that is named Vdmt16.sys or Vdnt32.sys on the computer. This driver is used to hide the virus process. The HaxDoor virus variants can restore these files if you delete them.
RESOLUTION
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
To solve this problem, follow these steps:
- Print the following Microsoft Knowledge Base article. Use the article as a guide to this procedure.
307654 How to install and use the Recovery Console in Windows XP
- Click Start, click Run, type regedit, and then click OK.
- Locate the following registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogin\Notify - Locate and delete any entries in the registry subkey that reference "drct16" or "draw32".
For example, you may see entries that are similar to the following:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\drct16HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\draw32 - Insert the Windows XP installation CD, and then restart the computer from the CD.
- At the Welcome to Setup screen, press R (repair) to start the Windows Recovery Console.
- Select the number that corresponds to the Windows installation that you want to repair. This number is typically 1.
- If prompted, type the administrator password. If an administrator password does not exist, press ENTER.
- At the command prompt, move to the C:\Windows\System32 folder. For example, type cd C:\Windows\System32.
Use the ren (rename) command to rename the following files as shown. Remember to press ENTER after each command. If you see a "File not found" message, move to the next file in the list.
ren 1.a3d 1.a3d.bad ren cm.dll cm.dll.bad ren cz.dll cz.dll.bad ren draw32.dll draw32.dll.bad ren drct16.dll drct16.dll.bad ren dt163.dt dt163.dt.bad ren fltr.a3d fltr.a3d.bad ren hm.sys hm.sys.bad ren hz.dll hz.dll.bad ren hz.sys hz.sys.bad ren i.a3d i.a3d.bad ren in.a3d in.a3d.bad ren klo5.sys klo5.sys.bad ren klogini.dll klogini.dll.bad ren memlow.sys memlow.sys.bad ren mszx23.exe mszx23.exe.bad ren p2.ini p2.ini.bad ren ps.a3d ps.a3d.bad ren redir.a3d redir.a3d.bad ren tnfl.a3d tnfl.a3d.bad ren vdmt16.sys vdmt16.sys.bad ren vdnt32.sys vdnt32.sys.bad ren w32tm.exe w32tm.exe.bad ren WD.SYS WD.SYS.bad ren winlow.sys winlow.sys.bad ren wmx.a3d wmx.a3d.bad ren wz.dll wz.dll.bad ren wz.sys wz.sys.bad
If you want to delete these files when you are finished, type del *.bad.- Remove the Windows XP installation CD, and then type Exit to restart the computer.
- When the computer restarts, click Start, click Run, type regedit, and then click OK.
- Locate and delete the following registry subkeys and any entries that may be present under each subkey. If any registry subkeys from this list are not present, move to the next subkey in the list.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\vdmt16
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\vdnt32
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\winlow
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\memlow
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\vdmt16
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\vdnt32
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\winlow
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\memlow
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ENUM\ROOT\LEGACY_VDMT16
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ENUM\ROOT\LEGACY_VDNT32
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ENUM\ROOT\LEGACY_WINLOW
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ENUM\ROOT\LEGACY_MEMLOW - Locate and delete any entries that contain the Mszx23.exe file name under the following registry subkeys:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunServices
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices - Quit Registry Editor.
- Make sure that your antivirus and anti-spyware programs are updated with the latest definitions, and then perform a complete system scan.
The following malware has been identified by antivirus vendors.
| Symantec: | Backdoor.Haxdoor.D |
| Trend Micro: | BKDR_HAXDOOR.BC, BKDR_HAXDOOR.BN, BKDR_HAXDOOR.BA, BKDR_HAXDOOR.AL |
| PandaLabs: | HAXDOOR.AW |
| F-Secure: | Backdoor.Win32.Haxdoor, Backdoor.Win32.Haxdoor.al |
| Sophos: | Troj/Haxdoor-AF, Troj/Haxdoor-CN, Troj/Haxdoor-AE |
| Kaspersky Lab: | Backdoor.Win32.Haxdoor.bg |
| McAfee: | BackDoor-BAC |
Additional query words: steal username password credentials vdmt16 vdnt32 memlow winlow trojan downloader
Keywords: kbvirus kbprb kbtshoot kberrmsg KB903251
