RE: Hacking to Xp box

From: Enrique A. Sanchez Montellano (enrique.sanchez_at_hypersec.co.uk)
Date: 09/05/05

  • Next message: misiu: "Re: hping and firewall testing"
    Date: Mon, 05 Sep 2005 16:12:14 -0500
    To: pen-test@securityfocus.com
    
    

    Err just to make a nice change, you dont habve to be root to use ICMP raw
    sockets even to sniff them =) traed it and it Works userland

    Enrique A. Sanchez Montellano
    Feelance Consultant
    http://www.hypersec.co.uk

    -----Mensaje original-----
    De: Marco Monicelli [mailto:marco.monicelli@marcegaglia.com]
    Enviado el: Lunes, 05 de Septiembre de 2005 10:26 a.m.
    Para: Eduardo Suzuki
    CC: 'Juan B'; pen-test@securityfocus.com
    Asunto: RE: Hacking to Xp box
    Importancia: Alta

    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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    Audit your website security with Acunetix Web Vulnerability Scanner: 
    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
    vulnerabilities 
    to SQL injection, Cross site scripting and other web attacks before hackers
    do! 
    Download Trial at:
    http://www.securityfocus.com/sponsor/pen-test_050831
    ----------------------------------------------------------------------------
    ---
    ------------------------------------------------------------------------------
    Audit your website security with Acunetix Web Vulnerability Scanner: 
    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 vulnerabilities 
    to SQL injection, Cross site scripting and other web attacks before hackers do! 
    Download Trial at:
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  • Next message: misiu: "Re: hping and firewall testing"

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