Re: TALPA - a threat model? well sorta.

[7v5w7go9ub0o]

(this was posted in linux.kernel, before I realized there was a 
linux.kernel.malware.    Hope it helps your discussion)

(FYI. Dazuko may have trailblazed some of the issues now under
discussion re: libmalware.so. It has worked well for me. It used to be
an LKM, it is now a source patch. It is used in a number of commercial
products)


<http://dazuko.dnsalias.org/wiki/index.php/Main_Page>

"A Virtual Device Driver to Allow Online File Access Control

A common interface is needed, which allows userland applications to
perform online file access control. Dazuko aims to provide that interface."

FWIW, I'm not associated with Dazuko or Antivir; I've been happily using
Dazuko with AntiVir for a year or so.

1. AntiVir includes numerous Linux signatures as well as Windows. So I
scan both 'ix downloads, as well as the process of compiling new software.

2. Other AntiMalwares are using Dazuko, though many are scanning for
Windows malware only.

3. The AntiVir/Dazuko combination with full heuristics has blocked
access to clearly dangerous JS scripts in my browser cache.

4. IMHO, what is needed is a Dazuko or libmalware/Integrity database
link. If an md5 of an executable or script is new or has changed, access
is blocked 'til a response to a popup is given. Access can be blocked;
one-time allowed; or permanently allowed, in which case the md5 is updated.

Hope This Helps.

<next msg>


Andi Kleen wrote:
> 7v5w7go9ub0o <7v5w7go9ub0o@xxxxxxxxx> writes:
>
>> (FYI. Dazuko may have trailblazed some of the issues now under
>> discussion re: libmalware.so. It has worked well for me.
>
> Against what exactly did it protect you? Please give a concrete example.
>
> -Andi
>

1. This came in a few minutes ago:

Aug 13 14:56:31 tux antivir[6381]: AntiVir ALERT: [EML/FakeLink.F]
/jail/tbird/root/.thunderbird/0r2957kg.default/Mail/L
ocal Folders/Junk.XXX <<< Contains detection pattern of EML/FakeLink.F
in EML form

2. I have not retained the logs of "suspicious scripts" in my browser,
but have come across perhaps 4 blocked scripts within the last month.
Admittedly at dodgy sites.

XSS attacks are platform independent, and are a significant concern.


Please note that when I say it has worked well for me, I am not saying
that it has saved my bacon! :-)

1. I am referring to the mechanics of having the Kernel/userland app
stop processing when it finds a malware signature or heuristic detection.

2. Am also referring to the totally manageable (IMHO) overhead.

I've mentioned my experience with Dazuko/antivir only because it may be
useful to the ongoing discussion about the nature of libmalware.so.

3. I am frankly waiting for a bug to get into my upstream distribution
chain - through a hijacking or some wonderful DNS prank - at which point
I ..hope.. a signature or heuristic will block my root-enabled make install.

4. Again, my hope for libmalware.so/dazuko is a realtime
integrity-management link.

<end posts>

HTH

p.s. The question has developed, should this monitor root activities. 
IMHO, the answer is a definite YES!  We are most vulnerable during 
software updating; AntiMailware signatures may stop the compilation or 
installation of a Trojan - by root.






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