Security Incidents mailing list archives

RE: strange windows behaviour.


From: Harlan Carvey <keydet89 () yahoo com>
Date: Thu, 9 Oct 2003 15:28:45 -0700 (PDT)

Paul,
 
There's been a lot of discussion about this amongst
av professionals.
There's really no advantage to scanning streams
because they are
"inert".  In order for the trojan to do anything, it
has to "come out of
hiding" as it were, and when it does, av on access
scanning will detect
it **if it's a known trojan**.  While it's in the
stream it's merely in storage, not being used.

Can you elaborate on "has to come out of hiding"? 
I've repeatedly demonstrated how an executable can be
written to an ADS and launched directly from that
location, without having to be copied to another
location, such as a temp file.  The same is true on
Win2K systems and above with VB and JavaScript files.

Thanks for anything you can provide.

Harlan

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