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Re: Exploiting a Worm
From: Marco Monicelli <marco.monicelli () marcegaglia com>
Date: 15-Sep-2005 08:47:12 CEDT

Well, if I'm not wrong, the proper client will send the proper string to
the proper open port and this will results in a prompt shell.

The fact that it doesn't behave like a normal Agobot could mean that it is
a variant and that would explain the fact that it has not been recognize by
the AV (I suppose you have an AV software on that NT machine).

I would try to search on the pc some of the files of Agobot and in case you
find anything....do a backup of sensible data and format the computer.
Always the best cleaning solution according to me.

Just my 2 cents

Marco




Hi list,

I'm pentesting a client's network and I have found a Windows NT4 machine
with ports 620 and 621 TCP ports open.

When I netcat this port, it returns garbage binary strings. When I connect
to port 113 (auth), it replies with random USERIDs.

According to what I have found, this behaviour would mean the presence of
the Agobot worm.

A full TCP scan revealed the following result:

(The 29960 ports scanned but not shown below are in state: closed)
PORT      STATE    SERVICE
21/tcp    open     ftp
25/tcp    open     smtp
80/tcp    filtered http
113/tcp   open     auth
135/tcp   filtered msrpc
137/tcp   filtered netbios-ns
139/tcp   filtered netbios-ssn
443/tcp   open     https
445/tcp   filtered microsoft-ds
465/tcp   open     smtps
554/tcp   open     rtsp
621/tcp   open     unknown
622/tcp   open     unknown
1028/tcp  open     unknown
1031/tcp  open     iad2
1036/tcp  open     unknown
1720/tcp  filtered H.323/Q.931
1755/tcp  open     wms
4600/tcp  open     unknown
5400/tcp  filtered pcduo-old
5403/tcp  filtered unknown
5554/tcp  filtered unknown
5800/tcp  open     vnc-http
5900/tcp  open     vnc
6999/tcp  filtered unknown
8080/tcp  open     http-proxy
9996/tcp  filtered unknown
10028/tcp filtered unknown
10806/tcp filtered unknown
12278/tcp filtered unknown
14561/tcp filtered unknown
16215/tcp filtered unknown
17076/tcp filtered unknown
18420/tcp filtered unknown
18519/tcp filtered unknown
19464/tcp filtered unknown
20738/tcp filtered unknown
25717/tcp filtered unknown
25950/tcp filtered unknown
28974/tcp filtered unknown

I have checked the open ports and no-one seems to be the worm ftp server or

something useful related to the worm. Some ports allow input but don't
reply
anything...

Does anyone knows a way to exploit this worm to get access to the system?

Thanks in advance,
Ian

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