RE: RE: ICMP PING CyberKit 2.2 Windows

["Mike Feetham" <mike.feetham () percepta-crm com>]

Between Monday and Tuesday we saw over 10,000 hits on our Class C.  Between
yesterday and today that number dropped to about 3,000.  Today, we're not
seeing any.  My only guess is that our ISPs are blocking them (Allstream,
and Worldcom).  Has anyone else seen this behaviour?


-----Original Message-----
From: snort-users-admin () lists sourceforge net
[mailto:snort-users-admin () lists sourceforge net] On Behalf Of Eric Greenberg
Sent: Wednesday, August 20, 2003 9:46 AM
To: nelsbels () cableone net; 'Stevo'; snort-users () lists sourceforge net
Subject: RE: [Snort-users] RE: ICMP PING CyberKit 2.2 Windows

We noted this on Monday and the pings have been increasing at a very high
rate. It is concerning. We have disabled ping (and ICMP for that matter) on
all the servers where practical. You can do this in the firewall (easiest
solution) or from within the operating system (e.g. the Linux kernel,
recompile)

Regards,

Eric Greenberg
Chief Technical Officer
NetFrameworks, Inc.
http://www.NetFrameworks.com

-----Original Message-----
From: snort-users-admin () lists sourceforge net
[mailto:snort-users-admin () lists sourceforge net] On Behalf Of
nelsbels () cableone net
Sent: Tuesday, August 19, 2003 11:08 PM
To: 'Stevo'; snort-users () lists sourceforge net
Subject: [Snort-users] RE: ICMP PING CyberKit 2.2 Windows


Check this out: (This is from incidents.org)

Over the last few hours, sensors detected a remarkable increase in ICMP
traffic. At this point, we assume that the traffic is linked to the 'Nachi'
worm:http://vil.nai.com/vil/content/v_100559.htm The worm is also known as
'Welchia' (
http://securityresponse.symantec.com/avcenter/venc/data/w32.welchia.worm.htm
l )

While the investigation is still in progress, we did identify so far the
following characteristics:

- some of the traffic is spoofed
- the data content is all '170' (0xAA)
- ICMP echo requests (type 8, code 0)

Source-Target correlation fingerprints ICMP
Data:http://isc.sans.org/images/icmpfp.png
all Data:http://isc.sans.org/images/allfp.png
port 135:http://isc.sans.org/images/port135fp.png

Sample Packet
(target IP obfuscated)

0x0000   4500 005c 2dc8 0000 7901 66a6 4349 919e        E..\-...y.f.CI..
0x0010   xxxx xxxx 0800 3318 0200 6d92 aaaa aaaa        ......3...m.....
0x0020   aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa        ................
0x0030   aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa        ................
0x0040   aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa        ................
0x0050   aaaa aaaa aaaa aaaa aaaa aaaa                  ............

Snort identifies these packets as "ICMP PING CyberKit 2.2 Windows".


> So what's the deal with the 72000 odd ICMP PING CyberKit 2.2 Windows 
> alerts I've got in the past few days??  It's frickin crazy...  I've 
> read the posts on here, but what is actually causing this and is there 
> anything I can do
at
> my perimeter to stop these ICMP messages hitting my network?? It's just 
> annoying and I don't want to remove the rule that picks up on the ICMP 
> PING CyberKit 2.2 Windows!!

> Ideas??



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