W32/Forbot-BJ

Please follow the instructions for removing worms.

W32/Forbot-BJ is a network worm with backdoor functionality.

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

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run = windowsupdate.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce\
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run = windowsupdate.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run = windowsupdate.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run = windowsupdate.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce\
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run = windowsupdate.exe

W32/Forbot-BJ also creates its own service named "MSPatch".

Once installed, W32/Forbot-BJ 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:

flood a remote host (by either ping or HTTP)
start a SOCKS4 proxy server
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 machines affected by the LSASS vulnerability (see MS04-011).