W32/Nemsi-B

Please follow the instructions for removing infected executable files.

Windows NT/2000/XP/2003

In Windows NT/2000/XP/2003 you will also need to edit the following registry entry. The removal of this entry is optional in Windows 95/98/Me. 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 entry:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
ccExecute
<path to bootcfg1.exe>

and delete it if it exists.

Close the registry editor.

W32/Nemsi-B is a virus for the Windows platform.

W32/Nemsi-B tries to infect Windows executable files. Most files can be disinfected, except when the virus corrupts the file during a failed infection.

On the 29th day of the month, according to the computer's clock, the virus will attempt to delete the following files:

C:\boot.ini
C:\config.sys
C:\autoexec.sys
C:\io.sys
C:\msdos.sys
C:\ntdetect.sys W32/Nemsi-B is a virus for the Windows platform.

W32/Nemsi-B tries to infect Windows executable files. Most files can be disinfected, except when the virus corrupts the file during a failed infection.

On the 29th day of the month, according to the computer's clock, the virus will attempt to delete the following files:

C:\boot.ini
C:\config.sys
C:\autoexec.sys
C:\io.sys
C:\msdos.sys
C:\ntdetect.sys

W32/Nemsi-B copies itself to the Windows folder as "bootcfg1.exe" and creates the following registry entry in order to run automatically on computer login:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
ccExecute
<path to bootcfg1.exe>