Re: virus got past mcafee viruscan 8.7

[Shreyas Zare <shreyas () technitium com>]

Hi Anand,

Antivirus will detect viruses only that it knows, so it wont
detect/block any executable unless it has a matching signature for it.
New malware is found in hundreds everyday, so the AV company itself
may not have a sample of the virus you got. Also, AV themselves are
s/w written by someone, and are bound to have bugs. Such bugs can be
exploited to bypass AV detection mechanisms. In your case, the malware
is doing some action to bypass the Mcafee filter which looks like a
bug being exploited.

Regards,

On Wed, May 6, 2009 at 5:19 AM, Anand Narine <anand.narine () gmail com> wrote:
> Hi all
> Our client workstations all have Mcafee antivirus installed, but a
> virus infected on particular pc
> and has been sending out spam by making outbound connections on port 25.
> Mcafee viruscan 8.7 blocks programs from making outbound connections
> on port 25 by
> default so how did the virus get past ? I verified that the mcafee was
> working since I could
> not telnet to any mail server on the internet via port 25.



-- 
("Computers have a strange habit of doing what you say, not what you
mean." - SANS Top 25 Most Dangerous Programming Errors)

Shreyas Zare
Co-Founder, Technitium
eMail: shreyas () technitium com

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