I think rather than a sign of something sinister this sounds fairly simple.
For example, corrupted and crosslinked files. You say it contained old
emails, well maybe this PC was used as a workstation and was upgraded with
NT4 server but somehow the corrupted files were crosslinked and ended up in
autoexec.bat
I use to see this with DOS based PCs.

Chris Norris
----- Original Message -----
From: "Matthew S Barnes" <btc1alltel.net>
To: "Incidents" <incidentssecurityfocus.com>
Cc: "Chris Barnes" <cbarnesbfinity.net>
Sent: Saturday, September 14, 2002 4:53 PM
Subject: Huge Autoexec.bat

> Hi all we were working on a system the other day at a client's who called
us
> in to fix a downed domain controller, his system was blue screening and so
> we got there and started poking around the system, we noticed something
> weird and wanted to ask if anyone had seen it before. I hadnt ever ...
> His autoexec.bat was huuge 26 megabytes to be exact. Now this computer was
> running nt 4 sp6a and also a ton of other stuff but none of the stuff in
> autoexec.bat as far as i could see was anything related to his systems, i
> told him he was probably hacked and that he needed to really treat this
like
> it was a crime scene and try to save all the data so we could reconstruct
> later, well he said he didnt care(no wonder he was hacked ) and told me to
> not waste time on it he wouldnt pay me to investigate he would only pay me
> to fix it. I did save some of the files I thought were suspicious and was
> hoping someone, anyone could point me in a direction to find out what
would
> make this autoexec.bat so big? is there any known exploits that do this
type
> of thing? I appreciate all you help
>
> The autoexec.bat file was full of script's and code and also some old
emails
> of his from years ago and we never got time to go thru the whole thing
just
> enuff to make me think it was a total compromise of his system.....
>
> Sincerely
>
> Matthew S Barnes
>
> ---
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> Barnes Technical Consulting 2002
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>
>
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