With the release of the new Question-Defense online NTLM, MD5 and MD4
cracker I decide to write a quick how to on grabbing the hash’s from a
windows system. In order for this to work you need at least one username
and logon of a user with admin privileges. I may in the future write a
article on how to escalate your privileges from a user to a admin, but
for the sake of this article will assume you know at least one admin
user log on.
The tool I am going to use is called fgdump and is available here
. The are other tools called
PWDump which achieve the same result but I really like fgdump so I use
it for all my hash dumping needs. My target is going to be a Windows
2003 server, but this will work on XP, Vista and Windows 7.
The tool can just be run on the local machine with no
arguments at all and will dump the hash’s to a log file:
Now this is pretty easy but what if you do not have physical access
to the server?
We can use fgdump remotely which is the way I generally use it.
Lets run a quick scan of our target and make sure its up with
the proper ports open for the connection:
Ok so we see if our server target is up.
I use a great many command line windows tool so I try to keep them
all in the C:/tools directory and add it to the path. I also like to
have my cygwin binaries in the path so I can have UNIX like commands in
my windows terminal. Check
this article
if you are interested in doing that.
So lets run our tool. Its pretty much the same we just need
to add a few arguments:
-
-h the ip of the host
-
-u the username
-
-p the password
Once we hit enter and execute the fgdump.exe it will notify
us if the command completed successfully or not:
As you can see we had a successful dump. This will be saved in a log
file in pwdump format on the machine we ran the tool from.
Lets see what that looks like:
Now this is the part where most people get confused. Windows actually
uses two kinds of hashing algorithms. The first is called LM which is
old and obsolete and is actually turned of by default in Windows Vista
and Windows 7. The second one is called NTLM which is the one we are
currently interested in.
So at this point you are probably wondering what part of that
gibberish is the actual NTLM hash.
Lets open it in notepad so we can get a better look:
So lets break down the fields:
Alex:1004:F5D023D8475D3F6E144E2E8ADEF09EFD:6E6212F9FAC92682C51BB68DDC4819D7:::
|
The fields are separated by colons. So the first field is clearly the
username, the second field is the user id, the third field is the LM
hash. On systems with LM disabled like Windows 7, this will be blank.
The final field is the NTLM hash we are interested in. I have
highlighted the correct section of the hash in the picture in order to
be really clear on the subject.
Once you have the hash, just copy it to you clipboard and
open up our
online cracker
and select a option and let Question-Defense’s
servers do the hard work for you:
Once your job has been completed the results will be emailed to you.
And not one ounce of CPU power on your local machine used. We also offer
special rates for companies who are interested in auditing large lists
of passwords to make sure their users are practicing secure password
policies.
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