RE: Nachi
- From: "Greg Mulholland" <gmulholland@xxxxxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Thu, 20 Nov 2003 14:50:23 -0800
Phil
There is a command. I remember using it for just this reason. I know it
is a tail.exe because its on my system, but I cant for the life of me
remember where it came from. I thought it may have been part of the
pstools suite from sysinternals but its not.
I will try and dig it out and let you know.
Greg Mulholland
gmulholland@xxxxxxxxxxxxxxx
http://www.isaserver.org <http://www.isaserver.org/>
http://isatools.org <http://isatools.org/>
http://www.google.com <http://www.google.com/>
________________________________
From: Phill Hardstaff [mailto:phillh@xxxxxxx]
Sent: Thursday, November 20, 2003 3:58 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Nachi
http://www.ISAserver.org
Jim, yep, I can confirm that
http://support.microsoft.com/default.aspx?scid=283213 works great. But
don't do the first one :) Also, once you have done this you can see in
the logs very quickly which host the attack is coming from, just wish
Windows had a tail command, I tried Wintail but it goes to 100% CPU,
anyone know anything that works well, so you could watch the tail end of
the packet log and see straight way what is happening, like 100 denies
for ICMP from one internal host in under 1 second = Nachi (most likely).
Cheers
Phill
-----Original Message-----
From: Jim Harrison [mailto:jim@xxxxxxxxxxxx]
Sent: Thursday, 20 November 2003 2:33 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Nachi
http://www.ISAserver.org
Ok, kids; quicherbichin' or I'll turn this alias around and no one will
get any McDonalds tonight..!
Actually, you're both right:
1. DoS is exactly that; misuse a perfectly valid traffic profile to
prevent use of the server; Nachi is built to do this and it succeeds in
grand fashion because ISa is trying to process the traffic.
2. ISA has one big flaw that Nachi, Blaster and other viruses / worms
have taken advantage of; it considers the internal network as fully
trusted. This has been rethought for the future release, but it can't
be changed for ISA2000.
What's the right answer?
Try this to help your ISA withstand the jackasses that can't keep their
laptops clean:
http://support.microsoft.com/default.aspx?scid=283213
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
---
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Checked by AVG anti-virus system (http://www.grisoft.com).
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