Re: [Full-Disclosure] MyDoom bios infection

[Juari Bosnikovich <juarib@m-net.arbornet.org>]

On Thu, 29 Jan 2004, Frank Knobbe wrote:

> On Thu, 2004-01-29 at 03:14, Ferris, Robin wrote:
> > >It was also unknown that the virus infects the BIOS of the computer it
> > >infects by injecting a 624bytes backdoor written in FORTH which will open
> > >port tcp when Mydoom will be executed AFTER febuary 12.
>
> Although code in BIOS could interact with your network card, it would
> require the correct driver routines for your particular card. Does the
> virus come with network card drivers for a variety of cards? No? Then
> BIOS code won't open a TCP port.

I had the same thought at first and conducted an experiment.

Using a clean Windows Server 2003 32 bit Edition on a machine with a
network adapter using the realtek 8139 chip I installed the virus and
setted the date to Febuary 11 11:50 and shutted it down after making sure
the virus has been successfully installed.

Most of you would agree with me if I would say that nothing happened when
I rebooted the machine but this is FAR from being what happened.

It appears that what I called sooner a BIOS BackDoor is more of a
Microsoft Windows exploit. When the infected machine boots for the SECOND
time AFTER febuary 12 it is injecting a malicious program in the Windows
installation that downloads a new version of Mydoom which will probably be
called Mydoom.c after it's discovery.

I understand the point of vue of unbeleivers but unfortunately it is very
CLEAR to me that they did not conduct their own research concerning this
VERY destructive virus.

As a reminder to the various persons which contacted me privately via
email and to whom I shared more information PLEASE keep it private.

                                        Juari Bosnikovich

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