Haroon Meer wrote:
Hi..
About 2 years ago, we demo'd Setiri, a win32 trojan that tunneled data off
networks through the use of Invisible Internet Explorer instances. This
allowed us to avoid sticky issues like authentication / etc and worked nicely
against personal firewalls configured to allow out IE traffic.
Despite the noise it generated back then, very little has been done to
combat the problem. So we threw together a few lines of C# and tacked on a
gratuitous .pdf (for good measure) for an angle we believe can go a long way
towards mitigating the threat..
In short : an invisible browser is not the same as a visible one, and
personal firewalls (that do outbound application control) should not treat
them the same. Application-level access control systems should be able to
detect whether an application is running visible or not.
The short paper : http://www.sensepost.com/garage_portal.html /
http://www.sensepost.com/restricted/casper.pdf
The badly written C# : http://www.sensepost.com/garage_portal.html /
http://www.sensepost.com/restricted/casper.zip
As usual, please mail questions/comments/flames to research@sensepost.com /
haroon@sensepost.com
/MH
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Haroon Meer MH
SensePost Information Security +27 83786 6637
PGP : http://www.sensepost.com/pgp/haroon.txt haroon@sensepost.com
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With all the spyware crap that is on computers that are easy targets, and some
that aren't, why would making it invisible make a difference at all? Hell,
just open the window in front of the user take up the whole screen, pop-up
about 30-50 other windows slowly and/or based on the CPU speed in another
process and upload the data through the first one while the user is distracted
by the others. IE would be an easy target for this kind of distraction,
mozilla would probably be just as easy...
[This mail has been send from http://www.rootshell.be.]
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