W32/Forbot-DD

Category: Viruses and Spyware
Type: Win32 worm
Prevalence: Small Number of Reports

Download Download our free Virus Removal Tool - Find and remove threats your antivirus missed

W32/Forbot-DD 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 msc32.exe and creates the following registry entries:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
NvCplScan
msc32.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce\
NvCplScan
msc32.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
NvCplScan
msc32.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
NvCplScan
msc32.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce\
NvCplScan
msc32.exe

W32/Forbot-DD also creates its own service named "MSCPLSCAN", with the display name "NvCplScan".

Once installed, W32/Forbot-DD 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) and through backdoors left open by the Troj/Optix Trojans.