Re: [Snort-users] MS-SQL Worm propagation -false positive

On Thu, 8 Jan 2004, Natalie Keller wrote:
> Over a 5 minute interval Snort captured more than 500 scans with the
> classic signature for MS-SQL Worm propagation.
> The originating ip belonged to a laptop running XP with all up-to-date
> connected to the network over VPN 3-DES tunnel. The laptop was brought
> to IT for cleaning. The laptop was found to be up-to-date with all
> patches/service packs. The drive was scanned with Norton Anti-virus with
> all current signatures and came up clean. The laptop has been back on
> the network for 2 days with no further incidents. This would appear to
> be a false positive. Is there any other steps that could have been taken
> to track down and account for the original cause for this incident?
> Suggestions welcome.

Are you sure that the originating IP wasn't spoofed with the laptops IP
address?

If you have the alerts logged in pcap format and your snort sensor was
connected to the same network segment as the offending machine, use
tcpdump -e to find the MAC-address of the source. Then find the machine
with this MAC address, that's the infected one.

/Martin



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