W32/Brontok-N

Please follow the instructions for removing worms.

W32/Brontok-N is a worm for the Windows platform.

When first run W32/Brontok-N copies itself to:

<User>\Local Settings\Application Data\br4941on.exe
<User>\Local Settings\Application Data\csrss.exe
<User>\Local Settings\Application Data\inetinfo.exe
<User>\Local Settings\Application Data\lsass.exe
<User>\Local Settings\Application Data\services.exe
<User>\Local Settings\Application Data\smss.exe
<User>\Local Settings\Application Data\svchost.exe
<Windows>\ShellNew\bbm-urnmmgfc.exe
<Windows>\sembako-cfzjmmg.exe
<System>\cmd-bro-mmx.exe

and creates the following files:

<User>\Local Settings\Application Data\BronMes.ini
<System>\sistem.sys

The following registry entries are created to run br4941on.exe and bbm-urnmmgfc.exe on startup:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Tok-Cirrhatus-1959
<User>\Local Settings\Application Data\br4941on.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Bron-Spizaetus-cfgmmnru
<Windows>\ShellNew\bbm-urnmmgfc.exe

The following registry entry is changed to run sembako-cfzjmmg.exe on startup:

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Shell
Explorer.exe "<Windows>\sembako-cfzjmmg.exe"

(the default value for this registry entry is "Explorer.exe" which causes the Microsoft file <Windows>\Explorer.exe to be run on startup).

The following registry entry is set, disabling the registry editor (regedit):

HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System
DisableRegistryTools
1

Registry entries are set as follows:

HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
NoFolderOptions
1

HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System
DisableCMD
0

HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
Hidden
0

HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
HideFileExt
1

HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
ShowSuperHidden
0