RE: Virus/trojan tunnel out from behind firewall?

["M.Verba" <M.Verba () verizon net>]

Interesting... I  have been reading and following up on this discussion. I
seemed to have received this below email. I did not open it, as it was from
a person with a hotmail.com address. In addition, the link provided I did
not open - as it seems to be a link created  using the geocities domain.

Is this a hoax?

-----Original Message-----
From: Mike Shaw [mailto:mshaw () wwisp com]
Sent: Monday, February 25, 2002 6:31 PM
To: Rich Puhek; David Carmean
Cc: incidents () securityfocus com
Subject: Re: Virus/trojan tunnel out from behind firewall?


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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> --- Begin Message ---
>
>
> From: <cyber_flash () hotmail com>
>
> Date: Mon, 25 Feb 2002 15:16:40 -0500
>
>
>
> Description:
> ---------------
> In Macromedia Flash 5 it is possible to save the main 
> timeline variables of a movie to a file using the 
> undocumented fscommand "save".
>
> This windows 9X demo
>
> http://www.geocities.com/cyber_flash5/
>
> initializes the timeline variable with a trojan script 
> using Flash's own built-in actionscript which will be 
> saved in a file called "trojan.bat" located in the Start 
> Up folder path: C:\\WINDOWS\\Start 
> Menu\\Programs\\StartUp\\
>
> On the next reboot the batch file is run, creating a 
> harmless "trojan.exe" (fire flames graphic display) 
> program which is executed!
>
> This works only from Windows projectors (not in a 
> browser) and mainly affects website authors.
>
> Exploit?
> ----------
> fscommand("save",path\\filename)
>
> This function is not documented nor supported by 
> macromedia but is still present in their latest updated 
> flash player!?
>
> Solution:
> -----------
> Macromedia will quite probably remove the "save" 
> fscommand call in the near future and until then, 
> always be careful when opening unknown email 
> attachments etc.,...
>
> Macromedia has been notified of this potential threat.
>
> Thanks. 
>
>
> --- End Message ---
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