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Re: Strange response from network
From: Martin Mačok <martin.macok () underground cz>
Date: Thu, 16 Sep 2004 11:51:32 +0200

On Wed, Sep 15, 2004 at 02:36:14PM +0400, Shashank Rai wrote:

2) Nmap fails to identify the OS but identifies the service as
"Microsoft Distributed Transaction Server".

You mean "Microsoft Distributed Transaction Coordinator" ?

What kind of response do you get, when you connect to the port with
netcat and type "GET / HTTP/1.0<enter><enter>" ?

It is probably matching one of ^...\0..$ or ^ERROR\n$ patterns...

hping2 -S -V -n -c 1 -p 2443 -t 7 TARGET_IP
using eth0, addr: MY_IP, MTU: 1500
S set, 40 headers + 0 data bytes

len=46 ip=TARGET_IP ttl=249 id=40109 tos=0 iplen=40
sport=2443 flags=RA seq=0 win=0 rtt=6.3 ms
seq=80210401 ack=1098187429 sum=ec0b urp=0

This packet seems to be generated on Linux 2.0/2.2 (win=0, ttl=255,
ack!=0). Try p0f for TCP OS fingerprinting.

hping2 -S -V -n -c 1 -p 2443 -t 8 TARGET_IP
using eth0, addr: MY_IP, MTU: 1500
S set, 40 headers + 0 data bytes

len=46 ip=TARGET_IP ttl=122 id=16401 tos=0 iplen=44
sport=2443 flags=SA seq=0 win=16384 rtt=6.1 ms
seq=416937317 ack=1244107777 sum=61fe urp=0

This packet looks like a packet from MS Windows 2000.

b) is it possible to determine the IP of the 7th HOP.

You could try fingerprinting IP blocks around it, good luck :-)
Try elicit ICMP error messages from the device too.

You could also try getting that info from the node (router? cisco?) in
front of it (SNMP? NTP?).

Martin Mačok
IT Security Consultant

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