First, the EICAR file isn't a virus or by any stretch of the imagination
malicious. It simply displays a text string.

Secondly, while most mainstream AV companies do detect and flag it, mostly
for the benefit of people needing an installation check, they're not
actually required to do so, and it's unusual for other types of security
product to detect it.

In any case, the specification of the EICAR file is deliberately very
restricted. If you embed it in a larger file, it's no longer the EICAR test
file, and most products that detect the real thing will, by design,
disregard it unless they detect true malicious code within the larger file.

http://eicar.org/86-0-Intended-use.html
http://www.amtso.org/amtso-download-using-testfiles.html
http://go.eset.com/us/resources/white-papers/AVAR-EICAR-2010.pdf

--
David Harley CITP FBCS CISSP
Small Blue-Green World
ESET Senior Research Fellow

> -----Original Message-----
> From: listbounce (at) securityfocus (dot) com [email concealed]
> [mailto:listbounce (at) securityfocus (dot) com [email concealed]] On Behalf Of Dav Fisher
> Sent: 31 May 2012 23:55
> To: security-basics (at) securityfocus (dot) com [email concealed]
> Subject: Are Proxy Firewalls a Security Hole?
>
> 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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