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Re: Hacking to Xp box
From: Marco Monicelli <marco.monicelli () marcegaglia com>
Date: 06-Sep-2005 09:56:06 CEDT

First you create an user with a name which looks like the default Microsoft
support user. Here's an example:

net user SUPPORT_3569a74r h4x0r /add /active:yes /expires:never
/passwordchg:yes /passwordreq:yes

This will create a "not really suspect" user with passowrd set to "h4x0r",
in an active mode, never expires, can change the pass and required password
authentication.

net localgroup Administrators SUPPORT_3569a74r /add

This will add the just created h4x0r account to the local admin group. If
you own a Server you can even do it for the Domain Group.

Here's some reg tricks:

HKLM\SOFTWARE\Microsoft\Windows
NT\CurrentVersion\Winlogon\SpecialAccounts\UserList

Under this reg key you can create your h4x0r account and set the DWORD
value to "0". This will not show your account in the Login screen.Beside,
default folders will be created in the "Document and Settings" section.

HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Network

Here you create a DWORD value named "NoWorkgroupContents" setting it to
"1". This will hide the other workgroup's users.

There are other way to create an hidden user (see rootkits for win32
platform) but they use other technique rather than registry settings. API
and dll injection are their best friends in this case.

Just my 2 cents.

Marco


Hidden user in admin group? Could you let me know how you do this?


-----Original Message-----
From: Marco Monicelli <marco.monicelli () marcegaglia com>
To: Eduardo Suzuki <eduardo.ac.suzuki () gmail com>
CC: 'Juan B' <juanbabi () yahoo com>; pen-test () securityfocus com
<pen-test () securityfocus com>
Sent: Mon Sep 05 16:25:43 2005
Subject: RE: Hacking to Xp box

Good afternoon Eduardo/List (here's 15.14)

I think there was a misunderstanding in the firewall point:

juan is operating INSIDE the network and I thought he might want to show
the fact that, once an intruder gets in, he can bypass the OUTGOING packet
filter of the SP2 firewall. I didn't think he wanted to show how insecure
is SP2 firewall from the outside. Here explained the misunderstanding.

Regarding ICMP backdoors, this technique was first use by some skilled guy
3/4 years ago. Of course u needed "root" privilegies and was operated on
*nix boxes only. You could have install this ICMP backdoor instead of a
much more invasive rootkit. Nowadays I came across some ICMP backdoor for
Win32 platform. Never went deeper into this matter but I know it works
pretty good, if the firewall does not block ICMP packets.

As per the JPG problem, form what you say I assume you never tried it so I
suggest you to give a try. Download a good joiner, merge your favourite
auto-installing R.A.T. with a simple JPG and then run it. You'll see the
.exe will be runned and it will install itself. Better than 1000
theories....1 practice! ;)

HXdef is not the only rootkit for windows around. There are several ones
which are still undetected but of course not published. I've read some
comments on some underground forums but never had the chance to get my
hands on. Bytheway, rather than a rootkit, I would suggest for a windows
machine to simply add an hidden user to the admin group and do some other
"old fashioned" DOS trick, exploiting new DOS commands available in
Windows. If you want to see some nice/nasty BATCH file, just let me know.
;)

Curiosity engeneering rules. Believe me. ;)

Hope these lines can help anyone.




-----Original Message-----
From: Marco Monicelli [mailto:marco.monicelli () marcegaglia com]
Sent: Monday, September 05, 2005 6:24 AM
To: Eduardo Suzuki
Cc: 'Juan B'; pen-test () securityfocus com
Subject: RE: Hacking to Xp box
Importance: High

Dear Eduardo/list,

I didn't discuss the fact that a server is much more juicy to hit for an
hacker than the simple workstation, even if it is the CEO box. Once
stated
this, we can proceed with the next point.

First, SP2's firewall can by easily bypass as mostly firewalls with
injection techinque. Infact they normally tend to allow HTTP traffic for
example. If the firewall doesn't block ICMP, you can use some ICMP
backdoor
which replies to a special crafted packet ICMP ping with a reverse
connect
shell. If you get admin privilegies on that box, you can even think to
stop
the firewall service on that machine. If the RAW sockets limit is your
problem, you can easily ENABLE back the raw sockets with some right
command
lines (google is your best friend once again).

             Could you please point me any article/POC/tool that
demonstrates
this injection technique? AFAIK by default XP SP2 firewall blocks incoming
packets if they don't match an existing outbound session. Even if some port
is open, you need to find some vulnerability that could be exploited to run
arbitrary code.
             What do you mean by ICMP backdoor? Is it something related to
covert
channels? If so, you need to have admin privileges to be able to install
such a tool.

Regarding the JPG/GIF question, there are many joiner/merger on the net
which are not recognized by AV and they can hide an EXE file inside the
Picture. Once the guy opens the pic, then the EXE is excecuted hiddenly
and
secretly. I'm not taking into consideration the buffer overflow
vulnerability as it is now a bit too old to be exploited (expecially on a
fully patched machine). So the trick is just that a "not really expert"
guy
will prolly open a picture (curiosity helps hackers a lot) and get
infected
easily without exploiting any vulnerability. I call this "curiosity
engeneering".... ehehehhehe....

             I'm curious about it. When you open an image, you don't
execute it
(not in the same way as you execute a PE-format file). If you join the
executable with an image and keep it as an image, for the operating system
the added bytes are considered part of the image, not a code in machine
language.

HXDEF is correctly a rootkit which means you first have to get admin
rights
on the target box. I've suggested that in order to mention rootkits which
can be useful to an hacker, once he got admin privilegies. Did you ever
see
this file "hxdef defeating modern detectors.rar"? It is a movie which
shows
how it is NOT detected by most of the rootkit's hunters. But maybe that
movie is not updated and you're right (I couldn't test it unfortunately).

             Give RootkitRevealer a try. :-) You'll see that it finds hxdef
without any problem. It even tells you what string hxdef is hiding and
where
its executable is. By default the executable reads its configuration from a
file with the same name, so you can easily find it. Then you can "clean"
the
configuration file (because it can be scrambled by filling it with extra
characters in some of the sections) and see what it's hiding on the
infected
machine.
             Another way to detect hxdef is by comparing the file list of
the
infected machine in two different ways. First you get the file list
locally,
then you get it remotely (using an administrative share, for example).
Hxdef
isn't able to hide its files if you list them through a network. So you can
find the hidden files by comparing the two lists. If you see a pattern (for
example, remotely you can see files that match "tohide*"), then you can be
almost sure this is the string hxdef is using to hide its evidence.
             After you find out the string you can do a little test. Create
a
directory that starts with the string, then see if it's listed using "dir".
Even when it's hidden you can enter into it without any problem.


Anyway, the main point to show the CEO the insecurity of the box is to
get
ADMIN privilegies over there. Then you can choose the game you wanna play
on that computer.

I'm opened to any further suggestion, tnx for yours Eduardo.

             Thanks for your opinion as well, Marco!

Cheers

Marco






             Hi, Marco!

             IMO, I think it's harder to attack a workstation compared to
a
server through a network, since servers must have some open port in
listening state. On a workstation the user is the weakest point most of
the
time, while on a server there are many other parts to take into account.
If
there is a firewall in place (for example, the one that comes with XP
SP2),
which attacks are possible through a network? AFAIK just a few. Windows
XP
restricts most of the attacks that use anonymous connections. Service
Pack
2
restricts even more. If you are a domain admin, there are many
possibilities, but that's not the case here.
             What do you mean by "executing a jpg or a gif file"? I know
there
are buffer overflow vulnerabilities that can be exploited when opening an
image, but it's not a trivial attack. I'm not sure (because I didn't try
it), but I think it's even harder to do it when you need to merge an
executable into an image using a joiner. I'd like to know what you think
about it.
             Regarding the hxdef rootkit, you can find it out by using
RootKitRevealer from SysInternals. It's available at
http://www.sysinternals.com/Utilities/RootkitRevealer.html. BTW, hxdef
isn't
considered an attack tool. It's used after you successfully got access to
a
computer, when you want to hide files, open ports and so on.
             Just my $0.02.
             Regards,

             Eduardo Suzuki
             esuzuki_br () pop com br
             Eduardo.AC.Suzuki () gmail com

"The essential is invisible to the eyes."

-----Original Message-----
From: Marco Monicelli [mailto:marco.monicelli () marcegaglia com]
Sent: Friday, September 02, 2005 6:12 AM
To: Juan B
Cc: pen-test () securityfocus com
Subject: Re: Hacking to Xp box
Importance: High

Ciao juan!

If the CEO box is fully patched and FW is enabled, then your mission is a
little bit more difficult to accomplish. Besides, there are thousands of
recent exploits for windows which you can try. For example, did you try
the
Universal exploit for the Plug and Play vulnerability? It is published
everywhere. You can try with more recent exploits than the DCOM exploit
which is at least 3 years old.

If you want to try with the trojan, I would suggest you to google for
Bifrost, which is a Remote Administration Tool (you can call it trojan if
you prefer) that is completely UNDETECTED by any AV (at the moment it is
still 100% undetected). You can pack it inside any file (exe, jpg,
gif....)
and it will be executed silently and hiddenly. Moreover, Bifrost can
bypass
firewalls injecting itself into Explorer.exe process. Another good
UNDETECTED tool is hxdef rootkit.

Arp poisoning could do the job but why not trying to steal the SAM file
and
to crack it? You can do that remotely if the machine has the ports you
mentioned opened. I bet you know some tool to steal the SAM and to crack
it. I love SAMDUMP for example. ;)

Last but not least, you can try with a Denial of Service to show your CEO
how easily a kid can prevent you from working with a simple DoS.

Why not sniffing the network? There are many undetected sniffers around
the
Web.

Just my 2 cents ;)

Marco






Hi Guys

Please give me a hend here.

Im trying to penetrate the CEO box to show him why we
need better security in our company, he told me to
show me how it can be done. he has xp pro sp 2
with all the pathches installed and FW enbled but I
cant ! I tried to use metasploit with the ms rpc dcom
exploit but it didnt worked. nessus found port 135 139
2000 and ntp are opened and also he can read some smb
shares and also outputed that this host doesnt disgard
SYN packets that have the FIN flag set. and port 2000
(callback is open).
what I can try more to  break this box? any ideas? I
know I
allways can try to arp poison his arp table and pass
all the machines traffic throw my laptop to capture
some passwords but this is enough. or send him a
trojan but we have a good anti virus protection  .


Does some of you have Ideas ?

Thanks a lot !

Juan



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Hackers are concentrating their efforts on attacking applications on your
website. Up to 75% of cyber attacks are launched on shopping carts, forms,
login pages, dynamic content etc. Firewalls, SSL and locked-down servers
are
futile against web application hacking. Check your website for
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website. Up to 75% of cyber attacks are launched on shopping carts, forms, 
login pages, dynamic content etc. Firewalls, SSL and locked-down servers are 
futile against web application hacking. Check your website for vulnerabilities 
to SQL injection, Cross site scripting and other web attacks before hackers do! 
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