Re: Virus/trojan tunnel out from behind firewall?

[Mike Shaw <mshaw () wwisp com>]

Sounds like "shell shoveling".  With the source code to Netcat, a decent 
coder could make a shell shovelling program easily.  Then 'glue' it to the 
elf-bowling du-jour and fakemail to your favorite target.  This will bypass 
many if not the majority of FW configs.

If you wanted to get real jiggy, you could make it connect to an IRC server 
and wait for commands to 'shovel' on cue.  OR, periodically check an HTTP 
discussion group waiting for the key-phrase.   Call it ''manchurian 
1.0"....*sigh* if I only had the time.

-Mike

At 10:22 PM 2/24/2002 -0600, Rich Puhek wrote:
> David Carmean wrote:
> >
> > Greetings.  New to the list; have looked through a few months of
> > the archives and hadn't seen this come up:
> >
> > Have there been any cases of a trojan/virus/etc tunnelling out from
> > behind a firewall and thus providing an attacker a way into the
> > "chewy center"?
>
> Do you mean a trojan/virus that actively establishes a tunnel through
> SSH, etc to an outside machine as a method of bypassing a stateful
> firewall?
>
> Or do you just mean that a trojan/virus/etc has provided an opening
> despite the firewall?
>
> I'd also consider the gray areas in between, like worms/trojans that
> transfer into (passwds, etc) back through SMTP, HTTP, or IRC.
>
> --Rich
>
>
> _________________________________________________________
>
> Rich Puhek
> ETN Systems Inc.
> _________________________________________________________
>
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