Re: Odd windows ICMP... any ideas what this is?

[Ryan Yagatich <ryany () pantek com>]

        Although it may not be directly related, wasn't there some chat
server written some time ago that distributed its text through icmp?
        If so, Could this be a deviation of this maybe testing the
destination to see if it can accept such packets so that it could transmit
other data?


Thanks,
Ryan Yagatich

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On Mon, 9 Jun 2003, ted klugman wrote:

> Our IDS has been reporting some large ICMP packets on
> our internal network. Our internal network is a
> Windows2000 domain -- servers and clients.
>
> - Packet size is always 2090 bytes
> - Almost always sent from a client or member server to
> one of the two boxes running Active Directory
> - The ping payload itself is actually a JPEG of the
> Microsoft logo. This JPEG can actually be found inside
> userenv.dll.
>
> I googled for any details, and I see that others have
> run into this before. However, there were no answers,
> just questions. See these two links for identical
> packets:
>
> http://archives.neohapsis.com/archives/linux/debian/2002-q4/0658.html
>
> http://cert.uni-stuttgart.de/archive/debian/security/2002/11/msg00222.html
>
>
> Anyone else seen these? Any idea what's causing them?
> Is this 'normal' behavior on a W2K network?
>
> Other than the fact that they are relatively large
> ICMP packets, they don't appear to be malicious in any
> way. There is no other malicious traffic seen on our
> network.
>
> TIA.
>
> -TedK
>
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