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Re: Network Segregation to prevent spread of malware
From: Jeffrey Walton <noloader () gmail com>
Date: Wed, 23 Jan 2013 08:49:14 -0500

On Wed, Jan 23, 2013 at 8:07 AM, Rob <synja () synfulvisions com> wrote:
Additionally, the services commonly used for worm propagation (RDP/TS, RPC, etc) are also used heavily for domain 
operations anyway.
The Worm Wars FTW (Sasser vs Netsky vs Bagle, etc)! They were
spreading, uninstalling other worms, and then patching the host to
keep the other worms out. And spreading using FTP, TFTP, SMB, etc.

That goodness the worms were patching hosts. The administrators were
doing a poor job and needed the help.


-----Original Message-----
From: Jerry Bell <jerry () riskologist com>
Sender: listbounce () securityfocus com
Date: Wed, 23 Jan 2013 07:07:25
To: tomright006 () gmail com<tomright006 () gmail com>
Cc: security-basics () securityfocus com<security-basics () securityfocus com>
Subject: Re: Network Segregation to prevent spread of malware

Hi Tom,

The answer is 'it depends', but probably no. If you are talking about a classic company network and dividing 
workstations into separate networks to prevent cross contamination, you have to consider the pivot points for most 
malware - email, file shares, etc, which can still allow malware to propagate between networks even if no traffic is 
allowed directly between them. Some kinds of malware, notably worms who propagate directly from one system to another 
via some kind of remotely exploitable vulnerability, would be contained by network segmentation, however those sorts 
of events are becoming increasingly rare (however when they do happen, they tend to be big events).


Sent from my iPhone

On Jan 22, 2013, at 5:33 PM, tomright006 () gmail com wrote:

Hello All,

I need few tips on Network Segregation to prevent spread of Malware. Can I avoid Malware spreading from one network 
segment to another just by segregating network with access list or firewalls?

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