Dav,

The 68 chars of EICAR virus-test signature must not be combined with
any other larger test file.
It may optionally be appended by any combination of whitespace
characters (not exceeding 128 chars in length) and use only allowed
whitespace chars such as: space character, tab, LF, CR, CTRL-Z.

The reason why most proxy firewall do not perform deep inspection for
larger file (more than X MB of size) because commonly virus (or
dropper) will have much smaller size to infect the victim effectively.
It may later download the real payload of virus once successfully
exploit the victim host and stay persistent.

Kind regards,
SJ Alex Taidri

On Fri, Jun 1, 2012 at 6:54 AM, Dav Fisher <dfisher3202 (at) gmail (dot) com [email concealed]> wrote:
>
> Given that people are sending larger and larger files, proxy firewalls
> seem to be limited since they can't inspect files after a certain
> point and the 'stream', 'flow', 'express' AV options of many of the
> proxy firewall vendors inspect only a portion of the large file. I've
> been able to put the Eicar virus in different locations of a large
> test file and successfully get the file through the firewall.
>
> So, are proxy firewalls a security hole?

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