W32/Sdbot-CB

Please follow the instructions for removing worms.

Check your administrator passwords and review network security.

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\
Windows Update Process = wmiprvsc.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Windows Update Process = wmiprvsc.exe

and delete them if they exist.

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

HKU\[code number]\Software\Microsoft\Windows\
CurrentVersion\Run\Windows Update Process = wmiprvsc.exe

and delete it if it exists.

Close the registry editor.

W32/Sdbot-CB is an IRC backdoor Trojan and network worm.

W32/Sdbot-CB spreads to other computers on the local network protected by
weak passwords.

When first run W32/Sdbot-CB copies itself to the Windows System folder as
wmiprvsc.exe and creates the following registry entries, so that wmiprvsc.exe
is run automatically each time Windows is started:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Windows Update Process = wmiprvsc.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Windows Update Process = wmiprvsc.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
Windows Update Process = wmiprvsc.exe

Each time the Trojan runs it attempts to connect to a remote IRC server and
join a specific channel. The Trojan then runs continuously in the background
listening on the channel for commands to execute.