Sounds like you need to tune your sfportscan preprocessor.
http://www.snort.org/docs/snort_htmanuals/htmanual_2.4/rc1/node11.html#SECTION00317000000000000000
Refer to above link for help. Also be sure and subscribe to the
Snort-Users list at:
http://www.snort.org/community/lists.html
Joel
On 5/16/06, Isidro Catalán Ramos <icatalan@amigophone.es> wrote:
Hi list,
We have Snort 2.4.4 and in the logs appear a lot of Port Scan traffic of
this type:
(portscan) TCP Portsweep
(portscan) ICMP Sweep
(portscan) UDP Portsweep
(portscan) Open Port
And the payload of this alerts is like the above:
Payload (ASCII):
Priority Count: 5.Co
nnection Count: 4.IP
Count: 14.Scanned I
P Range: 192.168.1.9
:65.54.171.28.Port/
Proto Count: 8.Port/
Proto Range: 80:3410
.
This alerts come from a lot of our network computers but they seems to
be clean of spyware, worms, etc...
We need to know if this is a false posivite or we have a problem in our
LAN.
Tanks!
--
Isidro Catalán Ramos
Administrador de sistemas
-----------------------
Amigophone S.L.
[ www.amigophone.es ]
-----------------------
Telf: +34 933 661 007
Fax: +34 933 661 012
icatalan@amigophone.es
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--
--Joel
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