W32/Forbot-DH

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\RunOnce\
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\RunOnce\

and remove any reference to any file you deleted.

Close the registry editor.

W32/Forbot-DH is an IRC backdoor and network worm for the Windows platform.

Once installed, W32/Forbot-DH connects to a preconfigured IRC server and joins a channel from which an attacker can issue further commands. These commands can cause the infected machine to perform any of the following actions:

start an HTTP server
start an FTP server
portscan randomly-chosen IP addresses
execute arbitrary commands
steal information such as passwords and product keys
upload/download files

The worm can spread to unpatched computers affected by the LSASS vulnerability (see MS04-011), through backdoors left open by the Troj/Optix family of Trojans and to poorly protected network shares. W32/Forbot-DH is an IRC backdoor and network worm for the Windows platform.

In order to run automatically when Windows starts up the worm moves itself to the Windows system folder as scvvhost.exe and creates the following registry entries:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Microsoft Windows Update
scvvhost.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce\
Microsoft Windows Update
scvvhost.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Microsoft Windows Update
scvvhost.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
Microsoft Windows Update
scvvhost.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce\
Microsoft Windows Update
scvvhost.exe

W32/Forbot-DH also creates its own service named "Microsoft Update", with the display name "Microsoft Windows Update".