RE: SQL Slammer Variant?

From: Wilson, Aaron J. (
Date: 04/01/03

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    From: "Wilson, Aaron J." <>
    Date: Tue, 1 Apr 2003 13:17:06 -0800 

    #1 applies to us, and is a great idea. It has stopped today, maybe there's
    some significance being April 1 =). But when if/when it picks back up we'll
    have a go at it.

    Thanks for the suggestion.


    -----Original Message-----
    From: crucible []
    Sent: Tuesday, April 01, 2003 4:53 AM
    Cc: Wilson, Aaron J.
    Subject: Re: SQL Slammer Variant?


    If you're pretty sure that the traffic is originating internally and is
    spoofed, here are a couple of things you could do:

    - If you have internal routers, add source address spoofing filters to
       each of their interfaces. You could turn on logging for matches based
       on that rule and at least narrow down which of your networks this is
       coming from. This is a good thing to have in any event. People on your
       internal network shouldn't be sending spoofed packets.

    - If you don't have internal routers and you've got just one big
       switched network, then the source MAC address of the spoofed packets
       should hopefully be in the packet captures of your IDS logs. Use this
       information in combination with your switch management tools to figure
       out where the traffic is coming from.


    crucible <>
    Excellent. The weather machine is nearly completed. What do you say to that
    broccoli? Stop mocking me! -- Stewie from Family Guy
    Wilson, Aaron J. wrote:
    > I am witnessing SQL Slammer IDS events on an internal sensor that 
    > aren't coming from one particular source.  In fact, every packet sent 
    > has a unique and random source IP as well as a unique and random 
    > destination IP.  The data in the packet matches the one shown at 
    >  We have UDP 1434 
    > blocked around the perimeter and believe this traffic to be 
    > originating from a system within the internal network.
    > The rate of packets at around 2-6 packets per minute isn't as high as 
    > the original SQL Slammer traffic I have been seeing (at thousands of 
    > packets per minute).  But this is going to be difficult to track down 
    > on a large network.  If it spreads, 2-6 packets per minute per 
    > infected host with thousands of internal systems...
    > The first spell was between 03/27/2003 1023 and 1100 PST.  It picked 
    > up again at 1431 PST on 3/28/2003 and hasn't stopped yet.
    > Thoughts?  Similar experiences?  Note to coworkers - if this is a 
    > practical joke on me it's a good one.
    > -Aaron
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