W32/Sdbot-WC

Please follow the instructions for removing worms.

You will also need to edit the following registry entries, if they are present. Please read the warning about editing the registry.

At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.

Before you edit the registry, you should make a backup. On the 'Registry' menu, click 'Export Registry File'. In the 'Export range' panel, click 'All', then save your registry as Backup.

Locate the HKEY_LOCAL_MACHINE entries:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices

and remove any reference to any file you deleted.

Each user has a registry area named HKEY_USERS\[code number indicating user]\. For each user locate the entries:

HKU\[code number]\Software\Microsoft\Windows\
CurrentVersion\Run\

HKU\[code number]\Software\Microsoft\Windows\
CurrentVersion\RunServices\

and remove any reference to any file you deleted.

Close the registry editor.

W32/Sdbot-WC is a network worm with backdoor Trojan functionality for the Windows platform.

When first run, W32/Sdbot-WC copies itself to the Windows system folder as sdkcore.exe and creates the following registry entries in order to run each time a user logs on:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
SDK Core Component
sdkcore.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
SDK Core Component
sdkcore.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
SDK Core Component
sdkcore.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
SDK Core Component
sdkcore.exe

The worm spreads through network shares protected by weak passwords, MS-SQL servers and through various operating system vulnerabilities.

W32/Sdbot-WC connects to a predetermined IRC channel and awaits further commands from remote users. The backdoor component of W32/Sdbot-WC can be instructed to perform the following functions:

scan networks for vulnerabilities
download/execute arbitrary files
start an ftp server

Patches for the vulnerabilities exploited by W32/Sdbot-WC can be obtained from Microsoft at:

http://www.microsoft.com/technet/security/bulletin/MS02-039.mspx
http://www.microsoft.com/technet/security/bulletin/MS04-011.mspx
http://www.microsoft.com/technet/security/bulletin/MS04-012.mspx

W32/Sdbot-WC also drops a file to the current folder as msdirectx.sys. The dropped file is detected by Sophos as Troj/Furoot-A.