Re: Extracting NT password hashes from registry export file

["Joe Brown" <joe_brown () senet-int com>]

The problem I've come across with this is that since the IUSR_machinename
account is the anonymous web user, I don't have permissions to copy
c:\winnt\repair\sam._ c:\inetpub\wwwroot\sam._  Any ideas???

Joe

----- Original Message -----
From: <pmawson () deloitte co nz>
To: <pen-test () securityfocus com>
Sent: Wednesday, October 31, 2001 4:23 PM
Subject: RE: Extracting NT password hashes from registry export file


> David
>
> One problem you have is even administrator doesn't have access to the sam
> and security hives in the registry.
> Only the system account has access to these.
> As a result it is unlikely that the registry export contains these hives.
> There may be passwords cached in other areas, I don't know, someone else
may
> be able to answer that one.
>
> If you can run regedit /e then you should be able to run
> echo "I am the first line of cmdasp.asp" >>cmdasp.asp
>
> Use this technique to get cmdasp.asp up to the server.
>
> You can then use cmdasp.asp to run rdisk /s- (back up the registry to the
> repair directory)
> Run copy c:\winnt\repair\sam._ c:\inetpub\wwwroot\sam._
> Use your browser to download the file  http://www.taget.com/sam._
> Run it through lophtcrack and you're done.
>
>
> Phill
>
>
> -----Original Message-----
> From: David Watson [mailto:david.watson () ioko365 com]
> Sent: Thursday, 1 November 2001 4:59 a.m.
> To: pen-test () securityfocus com
> Subject: Extracting NT password hashes from registry export file
>
>
> Hi,
>
> Hopefully someone will have come across this problem before and will be
> able to offer some advice to save me some unnecessary pain. I`m trying to
> find a method to quickly and easily extract the NT password hashes from a
> registry export text file (ie regedit /e reg.txt) of a Win2K server.
>
> I have no file upload capability to the server in question, so I cannot
use
> interactive methods such as pwdump/samdump to export the NT password
hashes
> from memory (or pwdump3 with DLL injection for syskey protected hashes).
> However, I have been able to export a copy of registry as local
> administrator and download this data locally. Short of opening the ASCII
> export in a hex editor, locating the correct password hash starting
off-set
> location in [HKEY_LOCAL_MACHINE\SAM\SAM\Domains\Account\Users\000001F4]
and
> manually extracting the first 16 bytes for the LMHash and the next 16
bytes
> for the NTHash from the "V"=hex: record for each account (which will be
> skeyed on further obfuscated via DES encryption with the user's RID as the
> key I believe), I can`t find any tool or current technique to do this more
> easily.
>
> Has anyone ever tried to do this before, or come across/written a tool
> capable of reading an entire export file and extracting all the necessary
> data? Is there a better way to approach this problem that I might have
> missed? The source code for pwdump has a method to handle the
> de-obfuscation of the hashes but i`m surprised that I cannot find any
> previous papers or tools that attempt this process.
>
> As an aside, in the past on NT4 I would have updated the Windows repair
> directory using rdisk and extracted the hashes from the SAM. This only
> appears to be possible now in Win2K and above when using the GUI as
command
> line rdisk support was apparently dropped recently (MS Q231777). Has
anyone
> found a method of up refreshing the repair directory from the command line
> in Win2K yet?
>
> Any advice appreciated, i`m happy to summarise my findings and post them
> here for others.
>
> Thanks,
>
> David
>
>
>
> --
> David Watson                    Voice:  +44 1904 438000
> Technical Manager               Fax:    +44 1904 435450
> ioko365                 Email:  david.watson () ioko365 com
>
>
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