Penetration Testing mailing list archives
RE: Hacking to Xp box
From: <Steve.Cummings () barclayscapital com>
Date: Tue, 6 Sep 2005 09:16:15 +0100
Ok cool, as I thought But this doesn't really make the user invisible more hides the tracks, and an admin with knowledge of their environment (small ) would be able to spot this in the admin group But sort of agree that this makes the user less visible but would disagree that they are invisible Regards Steve Cummings -----Original Message----- From: Marco Monicelli [mailto:marco.monicelli () marcegaglia com] Sent: 06 September 2005 10:56 To: Cummings, Steve: IT (LDN) Cc: pen-test () securityfocus com Subject: Re: Hacking to Xp box Importance: High 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 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
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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 ------------------------------------------------------------------------ ------- ------------------------------------------------------------------------ For more information about Barclays Capital, please visit our web site at http://www.barcap.com. Internet communications are not secure and therefore the Barclays Group does not accept legal responsibility for the contents of this message. Although the Barclays Group operates anti-virus programmes, it does not accept responsibility for any damage whatsoever that is caused by viruses being passed. Any views or opinions presented are solely those of the author and do not necessarily represent those of the Barclays Group. Replies to this email may be monitored by the Barclays Group for operational or business reasons. ------------------------------------------------------------------------ ------------------------------------------------------------------------------ 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 -------------------------------------------------------------------------------
Current thread:
- RE: Hacking to Xp box, (continued)
- RE: Hacking to Xp box Josh perrymon (Sep 02)
- RE: Hacking to Xp box John Forristel (SunGard-Chico) (Sep 02)
- RE: Hacking to Xp box Eduardo Suzuki (Sep 03)
- RE: Hacking to Xp box Marco Monicelli (Sep 05)
- RE: Hacking to Xp box chad (Sep 03)
- RE: Hacking to Xp box Eduardo Suzuki (Sep 05)
- RE: Hacking to Xp box Marco Monicelli (Sep 05)
- RE: Hacking to Xp box McKinley, Jackson (Sep 05)
- Re: Hacking to Xp box Kelly Scroggins (Sep 06)
- Re: Hacking to Xp box Marco Monicelli (Sep 07)
- RE: Hacking to Xp box Steve.Cummings (Sep 06)
- RE: Hacking to Xp box Enrique A. Sanchez Montellano (Sep 06)
- Re: Hacking to Xp box Susan Bradley, CPA aka Ebitz - SBS Rocks [MVP] (Sep 06)
- Re: Hacking to Xp box Marco Monicelli (Sep 06)
- Re: Hacking to Xp box Marco Monicelli (Sep 06)