Disappearing autoexec.nt

[JULO]

My OS is XP. When I boot, there is no AUTOEXEC.NT in the
System32 folder or elsewhere. I use expand to restore this
from the setup CD and it remains in the system whatever
applications I run. It is still there just before I shut
down. When I reboot, it has gone again. This happens even
if I use MSCONFIG to prevent all startup and services from
running when I boot. Where else should I look to find what
is deleting AUTOEXEC.NT? Apart from Windows Update, I have
not installed or downloaded any applications recently.

 

[Rock]

My OS is XP. When I boot, there is no AUTOEXEC.NT in the
System32 folder or elsewhere. I use expand to restore this
from the setup CD and it remains in the system whatever
applications I run. It is still there just before I shut
down. When I reboot, it has gone again. This happens even
if I use MSCONFIG to prevent all startup and services from
running when I boot. Where else should I look to find what
is deleting AUTOEXEC.NT? Apart from Windows Update, I have
not installed or downloaded any applications recently.

There is a trojan causing this behavior by installing a file
windupdater.exe and creating registry entries for that file.

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