full-disclosure - Re: Weird traffic

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Date: Wed, 25 Feb 2009 12:50:25 -0500
From: julio sanchez <pete.sanches@...il.com>
To: B Null <bnull@...enseindepth.com>, full-disclosure@...ts.grok.org.uk
Subject: Re: Weird traffic

No IDS alert yet.
What alerted us was the constant ARP loop scan on various vista sp1 box
while we was monitoring the network
I'll send a pcap in one hour or twoThanks
2009/2/25 B Null <bnull@...enseindepth.com>

> Can you provide a pcap with the suspect traffic isolated?  Also, what
> alerted you to the odd behavior?  Did the traffic flag an IDS alert?
>
> bNull
>
> On Wed, Feb 25, 2009 at 9:27 AM, julio sanchez <pete.sanches@...il.com>wrote:
>
>> Hi,
>>
>> We're experiencing some weird arp traffic on our network, some box scan
>> constantly the subnets with loop "who-has" request
>> All the box are all windows vista sp1 fully patched.
>> We did format all the  supect box, and isolate them on a vlan, to
>> reinstall vista, updates, kaspersky, then we put it back on the network, and
>> still some ramdom freshly formated box scanning the network.
>> We find out that Vista will do an arp scan when it search for a network
>> printer, but it does this once.
>> The problem we have is an almost permanent arp scan on various boxs.
>> We know that some worm was hitting some network around the world with the
>> smb vulnerability, but all of our boxs are fully updated.
>> Have you experienced something like this before, or it seems to be legit
>> traffic ?
>> Can this be a worm or something related ?
>>
>> Thanks in advance
>>
>> Pete
>>
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>

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