RES: HTTP based trojans

Good question! It's just what I want to know, but it seems that my question did not raise a discussion.

People has been using HTTP based trojans for some years, but only after the Sensepost Black Hat presentation about Setiri it has become a major point of discussion.

I didn't see nobody sharing ideas about detecting (or even blocking) this stuff. I can imagine a couple of Snort rules to try to detect it, based on filenames and paths, like cmd.exe, \winnt, etc, but it would find a lot of false positives and wouldn´t be effective on cases using SSL. So, perhaps the point is on HIDS; But how can we detect the abnormal behaviour if the trojan is getting out through a IE window? Which adverse effects there will be if we block the use of invisible IE windows?

Regards,

Augusto

-----Mensagem original-----
De: s.wun [mailto:s.wun@thales-is.com.hk] Enviada em: quarta-feira, 6 de novembro de 2002 0:27 Para: AQBARROS@BKB.com.br; focus-ids@securityfocus.com Assunto: Re: HTTP based trojans

Hi,

What other open-source tool do you use to detect this attack?

Do you need help?

In addition to our free technical library, Pantek provides professional IT services to companies who utilize Open Source software: Learn more about Pantek's Technical Support offerings Place an order for 24/7/365 Technical Support here Learn more about Pantek, who we are, and what we do Chat with a Live Operator Related securityfocus.com Links bugtraq certification focus-bsd focus-ids focus-ih focus-linux focus-ms focus-sun focus-unix-other focus-virus forensics incidents libnet linux-secnews ms-secnews pen-test secpapers secprog sectools secureshell security-basics securityjobs sf-news vuln-dev webappsec Request more information about Pantek

Sam.
----- Original Message -----
From: <AQBARROS@BKB.com.br>
To: <focus-ids@securityfocus.com>
Sent: Thursday, October 31, 2002 8:46 PM Subject: HTTP based trojans

> As I saw on the last messages about detecting trojans through flow-based
> analysis, I thought if someone already made anything to detect trojans
that
> use Internet Explorer controls to communicate with the client, even on
> networks that allow only proxied (even authenticated) http connections.
Did
> anyone try to do such kind of thing?
>
> Regards,
>
>
> Augusto.
Received on Wed Nov 6 19:43:53 2002