Re: ISA Server detected a spoof attack
- From: "Eric Poole" <EPoole@xxxxxxxxxxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 14 Jan 2004 11:57:06 -0800
We had a lot of nachi when it first hit. This one doesn't seem to fit the same
pattern that we experienced. Plus, this one hits pretty regular on the half
hour. Nachi was more of random bursts. I also don't see this cisco box trying
to hit anything else (via our log/event correlation server).
_______________________________________________
Eric Poole
IS Security Analyst
Community Medical Centers
1140 "T" Street, Fresno, California 93721
559-459-6784 (phone) 559-459-2045 (fax)
-----Original Message-----
From: Jim Harrison [mailto:jim@xxxxxxxxxxxx]
Sent: Wednesday, January 14, 2004 11:37 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] Re: ISA Server detected a spoof attack
http://www.ISAserver.org
Also (send finger was faster than typing finger), that ICMP data signature is
typical of Nachi.
Whomever is sending it is infected...
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://www.microsoft.com/isaserver
http://isaserver.org/Jim_Harrison
http://isatools.org
Read the help, books and articles!
----- Original Message -----
From: "Eric Poole" <EPoole@xxxxxxxxxxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Wednesday, January 14, 2004 10:32
Subject: [isalist] ISA Server detected a spoof attack
http://www.ISAserver.org
I'm getting these about every half hour from our internal Cisco Works box
(172.16.10.168). The 2.9 address is the ISA external NIC
that is routed through our PIX. Any ideas?
"ISA Server detected a spoof attack from Internet Protocol (IP) address
172.16.10.168. A spoof attack occurs when an IP address that
is not reachable via the interface on which the packet was received. If logging
for dropped packets is set, you can view details in
the packet filter log."
Here's a sample from the packet filter log.
"1/13/2004, 20:43:17, 172.16.10.168, 172.16.2.9, ICMP, 8, 0, -, BLOCKED,
172.16.2.9, 45 00 00 3c 20 74 00 00 7f 01 b6 7b ac 10 0a a8
ac 10 02 09, 08 00 a1 b6 04 00 77 6e ad ad ad ad ad ad ad ad ad ..."
_______________________________________________
Eric Poole
IS Security Analyst
Community Medical Centers
1140 "T" Street, Fresno, California 93721
559-459-6784 (phone) 559-459-2045 (fax)
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