Listener Menu - SpecterOps Open Source

Main

help

The help command is used to view available commands for the Listener menu. Tab completion can be used at any time to provide the user a list of commands that can be selected. Merlin is equipped with a tab completion system that can be used to see what commands are available at any given time. Hit double tab to get a list of all available commands for the current menu context.

   COMMAND  |          DESCRIPTION           |            OPTIONS
+-----------+--------------------------------+--------------------------------+
  back      | Return to the main menu        |
  configure | Interact with and configure a  | configure <listener_name>
            | named listener to modify it    |
  delete    | Delete a named listener        | delete <listener_name>
  info      | Display all information about  | info <listener_name>
            | a listener                     |
  interact  | Interact with an agent         | interact <agent_id>
  list      | List all created listeners     |
  main      | Return to the main menu        |
  sessions  | List all agents session        |
            | information. Alias for MSF     |
            | users                          |
  start     | Start a named listener         | start <listener_name>
  stop      | Stop a named listener          | stop <listener_name>
  use       | Create a new listener by       | use
            | protocol type                  | [http,https,http2,http3,h2c]
  !         | Execute a command on the host  | !<command> <args>
            | operating system               |

back

The back command is used to move one level back. In this case the command will return the user to the main menu.

Merlin[listeners]» back
Merlin»

configure

The configure command is used to operate, or configure, a previously created listener.

Cycle through the available listeners using the tab key after the info command.

Merlin[listeners]» configure Default
Merlin[listeners][Default]»

delete

The delete command is used to delete a listener by its name. The user will be prompted for confirmation to prevent accidentally deleting a listener.

Cycle through the available listeners using the tab key after the delete command.

Merlin[listeners]» delete Default

Are you sure you want to delete the Default listener? [yes/NO]:
yes
Merlin[listeners]»
[+] deleted listener Default:0db5969e-2fa5-4f6d-8ec8-e07eaf4bf2c2
Merlin[listeners]»

info

The info command is used to display information about a previously created Listener. View the Listeners page for additional information on specific listener configurable options.

Cycle through the available listeners using the tab key after the info command.

Protocol: The communication protocol the listener will use
Name: The operator defined name for the listener
Port: The port that the listener will bind to
PSK: The Pre-Shared Key (PSK) that the listener will use for initial communication with an agent
URLS: The URLs that the listener will answer on for agent communications
X509Cert: The file path to the SSL/TLS x509 public certificate the listener will use
X509Key: The file path to the SSL/TLS x509 key file the listener will use
Description: The operator defined description of the listener
ID: A unique identifier for the instantiated listener
Interface: The network interface that the listener will bind to. Use 0.0.0.0 for ALL interfaces

Merlin[listeners]» info Default
+-------------+-----------------------------------------------------------------+
|    NAME     |                              VALUE                              |
+-------------+-----------------------------------------------------------------+
| Protocol    | HTTPS                                                           |
+-------------+-----------------------------------------------------------------+
| Name        | Default                                                         |
+-------------+-----------------------------------------------------------------+
| Port        | 443                                                             |
+-------------+-----------------------------------------------------------------+
| PSK         | merlin                                                          |
+-------------+-----------------------------------------------------------------+
| URLS        | /                                                               |
+-------------+-----------------------------------------------------------------+
| X509Cert    |                                                                 |
+-------------+-----------------------------------------------------------------+
| X509Key     |                                                                 |
+-------------+-----------------------------------------------------------------+
| Description | Default listener                                                |
+-------------+-----------------------------------------------------------------+
| ID          | aa020d5c-7c1a-4781-9d1d-e7c659d126f9                            |
+-------------+-----------------------------------------------------------------+
| Interface   | 127.0.0.1                                                       |
+-------------+-----------------------------------------------------------------+

interact

The interact command takes one argument, the agent ID, and is used to switch agents and interact with a different, specified agent.

Use the built-in tab completion to cycle through and select the agent to interact with.

Merlin[agent][c22c435f-f7c4-445b-bcd4-0d4e020645af]» interact d07edfda-e119-4be2-a20f-918ab701fa3c
Merlin[agent][d07edfda-e119-4be2-a20f-918ab701fa3c]»

list

The list command returns a list of all created listeners to include some configuration information and status.

Merlin[listeners]» list

+---------+-----------+------+----------+---------+------------------+
|  NAME   | INTERFACE | PORT | PROTOCOL | STATUS  |   DESCRIPTION    |
+---------+-----------+------+----------+---------+------------------+
| Default | 127.0.0.1 | 443  |  HTTPS   | Running | Default listener |
|  HTTP3  | 127.0.0.1 | 443  |  HTTP3   | Running | Default listener |
|   H2C   | 127.0.0.1 |  80  |   H2C    | Running | Default listener |
+---------+-----------+------+----------+---------+------------------+

main

The main command returns to the main menu.

Merlin[listeners]» main
Merlin»

sessions

The sessions command is used to quickly list information about established agents from the main menu to include their status. The sessions command is available from any menu in the CLI.

AGENT GUID - A unique identifier for every running instance
TRANSPORT - The protocol the agent is communicating over
PLATFORM - The operating system and architecture the agent is running on
HOST - The hostname where the agent is running
USER - The username that hte agent is running as
PROCESS - The Agent’s process name followed by its Process ID (PID) in parenthesis
STATUS - The Agent’s communication status of either active, delayed, or dead
LAST CHECKIN - The amount of time that has passed since the agent last checked in
NOTE - A free-form text area for operators to record notes about a specific agent; tracked server-side only

Merlin» sessions

               AGENT GUID              |    TRANSPORT    |   PLATFORM    |      HOST       |        USER         |                 PROCESS                  | STATUS | LAST CHECKIN |      NOTE
+--------------------------------------+-----------------+---------------+-----------------+---------------------+------------------------------------------+--------+--------------+-----------------+
  d07edfda-e119-4be2-a20f-918ab701fa3c | HTTP/2 over TLS | linux/amd64   | ubuntu          | rastley             | main(200769)                             | Active | 0:00:08 ago  | Demo Agent Here

start

The start command is used to start a previously created and stopped Listener by its name.

Cycle through the available listeners using the tab key after the start command.

Merlin[listeners]» start Default
Merlin[listeners]»
[+] Restarted Default HTTPS listener on 127.0.0.1:443

[!] Insecure publicly distributed Merlin x.509 testing certificate in use for https server on 127.0.0.1:443
Additional details: https://github.com/Ne0nd0g/merlin/wiki/TLS-Certificates
Merlin[listeners]»

stop

The stop command is used to stop a previously created Listener by its name.

Cycle through the available listeners using the tab key after the stop command.

Merlin[listeners]» stop Default
Merlin[listeners]»
[+] Default listener was stopped
Merlin[listeners]»

use

The use command is leveraged to create a new listener. The use command expects the listener type, by protocol, to follow. Press enter to select a template for the listener type.

Cycle through the available listener types using the tab key after the use command.

View the Listeners page for additional information on specific listener configurable options.

Merlin[listeners]» use http3
Merlin[listeners][http3]»

!

Any command that begins with a ! (a.k.a bang or exclamation point) will be executed on host itself where the Merlin server is running. This is useful when you want simple information, such as your interface address, without having to open a new terminal.

Merlin» !ip a show ens32

[i] Executing system command...

[+] 2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:z3:ff:91 brd ff:ff:ff:ff:ff:ff
    inet 192.168.211.221/24 brd 192.168.211.255 scope global dynamic noprefixroute ens32
       valid_lft 1227sec preferred_lft 1227sec
    inet6 fe80::a71d:1f6a:a0d1:7985/64 scope link noprefixroute
       valid_lft forever preferred_lft forever

Merlin»

Instantiated

This menu is accessed by issuing the the interact command followed by the name of previously created (instantiated) Listener. The help command is used to view available commands for the instantiated Listener menu. Tab completion can be used at any time to provide the user a list of commands that can be selected.

Merlin[listeners]» configure Default
Merlin[listeners][Default]» help

  COMMAND |          DESCRIPTION           |        OPTIONS
+---------+--------------------------------+------------------------+
  back    | Return to the listeners menu   |
  delete  | Delete this listener           | delete <listener_name>
  info    | Display all configurable       |
          | information the current        |
          | listener                       |
  interact| Interact with an agent         | interact <agent_id>
  main    | Return to the main menu        |
  restart | Restart this listener          |
  sessions| List all agents session        |
          | information. Alias for MSF     |
          | users                          |
  set     | Set a configurable option      | set <option_name>
  show    | Display all configurable       |
          | information about a listener   |
  start   | Start this listener            |
  status  | Get the server's current       |
          | status                         |
  stop    | Stop the listener              |
  *       | Anything else will be execute  |
          | on the host operating system   |
Listener Help Menu

back

The back command is used to move one level back. In this case the command will return the user to the root Listener menu.

Merlin[listeners][Default]» back
Merlin[listeners]»

delete

The delete command is used to delete the Listener you are currently interacting with, indicated in the square brackets in the Merlin prompt. The user will be prompted for confirmation to prevent accidentally deleting a listener.

Merlin[listeners][Default]» delete

Are you sure you want to delete the Default listener? [yes/NO]:
yes
Merlin[listeners]»

info

The info command is used to display information about the Listener you are currently interacting with, indicated in the square brackets in the Merlin prompt. View the Listeners page for additional information on specific listener configurable options.

Merlin[listeners][Default]» info
+-------------+--------------------------------------+
|    NAME     |                VALUE                 |
+-------------+--------------------------------------+
| Name        | Default                              |
+-------------+--------------------------------------+
| ID          | 2e3025e8-6e8e-4fe1-b69c-5d248e34068c |
+-------------+--------------------------------------+
| Interface   | 127.0.0.1                            |
+-------------+--------------------------------------+
| Port        | 443                                  |
+-------------+--------------------------------------+
| Protocol    | HTTPS                                |
+-------------+--------------------------------------+
| PSK         | merlin                               |
+-------------+--------------------------------------+
| URLS        | /                                    |
+-------------+--------------------------------------+
| X509Cert    |                                      |
+-------------+--------------------------------------+
| X509Key     |                                      |
+-------------+--------------------------------------+
| Description | Default listener                     |
+-------------+--------------------------------------+
| Status      | Running                              |
+-------------+--------------------------------------+
Merlin[listeners][Default]»

interact

See the interact section

main

The main command returns to the Main menu

Merlin[listeners][Default]» main
Merlin»

restart

The restart command stops the current listener and then immediately starts it. This is useful to apply configuration changes made with the set command.

Merlin[listeners][Default]» restart

    [-] Certificate was not found at:
    Creating in-memory x.509 certificate used for this session only
    Merlin[listeners][Default]»
    [+] Default listener was successfully restarted
    Merlin[listeners][Default]»

sessions

See the sessions section

set

The set command is used to set the value of a configurable option for the Listener you are currently interacting with. Use the show command to see a list of configurable options.

Cycle through the available configurable options for the current Listener using the tab key after the set command.

View the Listeners page for additional information on specific listener configurable options.

Merlin[listeners][Default]» set Name AcmeHTTPS
Merlin[listeners][Default]»
[+] set Name to: AcmeHTTPS
Merlin[listeners][Default]» set Description Main listener for Acme hacks
Merlin[listeners][Default]»
[+] set Description to: Main listener for Acme hacks
Merlin[listeners][Default]»
Merlin[listeners][Default]» info
+-------------+--------------------------------------+
|    NAME     |                VALUE                 |
+-------------+--------------------------------------+
| Port        | 443                                  |
+-------------+--------------------------------------+
| URLS        | /                                    |
+-------------+--------------------------------------+
| X509Key     |                                      |
+-------------+--------------------------------------+
| Description | Main listener for Acme hacks         |
+-------------+--------------------------------------+
| Name        | AcmeHTTPS                            |
+-------------+--------------------------------------+
| ID          | 2e3025e8-6e8e-4fe1-b69c-5d248e34068c |
+-------------+--------------------------------------+
| Interface   | 127.0.0.1                            |
+-------------+--------------------------------------+
| Protocol    | HTTPS                                |
+-------------+--------------------------------------+
| PSK         | merlin                               |
+-------------+--------------------------------------+
| X509Cert    |                                      |
+-------------+--------------------------------------+
| Status      | Running                              |
+-------------+--------------------------------------+
Merlin[listeners][Default]»

show

The show command is used to show a table of all configurable options. View the Listeners page for additional information on specific listener configurable options.

Merlin[listeners][Default]» show
+-------------+--------------------------------------+
|    NAME     |                VALUE                 |
+-------------+--------------------------------------+
| PSK         | merlin                               |
+-------------+--------------------------------------+
| Name        | AcmeHTTPS                            |
+-------------+--------------------------------------+
| X509Cert    |                                      |
+-------------+--------------------------------------+
| X509Key     |                                      |
+-------------+--------------------------------------+
| Description | Main listener for Acme hacks         |
+-------------+--------------------------------------+
| ID          | 2e3025e8-6e8e-4fe1-b69c-5d248e34068c |
+-------------+--------------------------------------+
| Interface   | 127.0.0.1                            |
+-------------+--------------------------------------+
| Port        | 443                                  |
+-------------+--------------------------------------+
| Protocol    | HTTPS                                |
+-------------+--------------------------------------+
| URLS        | /                                    |
+-------------+--------------------------------------+
| Status      | Running                              |
+-------------+--------------------------------------+
Merlin[listeners][Default]»

start

The start command is used to start the current Listener you are interacting with, indicated in the square brackets in the Merlin prompt.

Merlin[listeners][Default]» start

[-] Certificate was not found at:
Creating in-memory x.509 certificate used for this session only
Merlin[listeners][Default]»
[+] Restarted Default HTTPS listener on 127.0.0.1:443
Merlin[listeners][Default]»

status

The status command is used to quickly determine if the Listener’s server you are currently interacting with is running or stopped.

Merlin[listeners][Default]» status
Merlin[listeners][Default]»
Running
Merlin[listeners][Default]»

stop

The stop command is used to stop the current Listener you are interacting with, indicated in the square brackets in the Merlin prompt.

Merlin[listeners][Default]» stop
Merlin[listeners][Default]»
[+] Default listener was stopped
Merlin[listeners][Default]»

!

Merlin» !ip a show ens32

[i] Executing system command...

[+] 2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:z3:ff:91 brd ff:ff:ff:ff:ff:ff
    inet 192.168.211.221/24 brd 192.168.211.255 scope global dynamic noprefixroute ens32
       valid_lft 1227sec preferred_lft 1227sec
    inet6 fe80::a71d:1f6a:a0d1:7985/64 scope link noprefixroute
       valid_lft forever preferred_lft forever

Merlin»

Template

The Listener Template menu is accessed by issuing the use command followed by a valid listener type from the Listener Main menu. The help command is used to view available commands for the Listener menu. Tab completion can be used at any time to provide the user a list of commands that can be selected. View the Listeners page for additional information on specific listener configurable options.

Merlin[listeners]» use https
Merlin[listeners][https]» help

      COMMAND |          DESCRIPTION           |      OPTIONS
    +---------+--------------------------------+-------------------+
      back    | Return to the listeners menu   |
      execute | Create and start the listener  |
              | (alias)                        |
      info    | Display all configurable       |
              | information about a listener   |
      interact| Interact with an agent         | interact <agent_id>
      main    | Return to the main menu        |
      run     | Create and start the listener  |
              | (alias)                        |
      sessions| List all agents session        |
              | information. Alias for MSF     |
              | users                          |
      set     | Set a configurable option      | set <option_name>
      show    | Display all configurable       |
              | information about a listener   |
      start   | Create and start the listener  |
      *       | Anything else will be execute  |
              | on the host operating system   |
    Listener Setup Help Menu

back

The back command is used to move one level back. In this case the command will return the user to the root Listener menu.

Merlin[listeners][https]» back
Merlin[listeners]»

execute

The execute command is used to create and start the Listener from the configured template options. This is an alias for the start command.

Merlin[listeners]» use https
Merlin[listeners][https]» execute

[!] Insecure publicly distributed Merlin x.509 testing certificate in use for https server on 127.0.0.1:443
Additional details: https://github.com/Ne0nd0g/merlin/wiki/TLS-Certificates

[+] Default listener was created with an ID of: f6826564-000a-4edf-94b2-b79ee7d892a5

[+] Started HTTPS listener on 127.0.0.1:443
Merlin[listeners][Default]»

info

The info command is used to display the Listener template configurable options and their current value. View the Listeners page for additional information on specific listener configurable options.

Merlin[listeners]» use https
Merlin[listeners][https]» info
+-------------+------------------+
|    NAME     |      VALUE       |
+-------------+------------------+
| PSK         | merlin           |
+-------------+------------------+
| Interface   | 127.0.0.1        |
+-------------+------------------+
| Port        | 443              |
+-------------+------------------+
| URLS        | /                |
+-------------+------------------+
| X509Cert    |                  |
+-------------+------------------+
| X509Key     |                  |
+-------------+------------------+
| Name        | Default          |
+-------------+------------------+
| Description | Default listener |
+-------------+------------------+
| Protocol    | https            |
+-------------+------------------+
Merlin[listeners][https]»

interact

See the interact section

main

The main command returns to the Main menu

Merlin[listeners][https]» main
Merlin»

run

The run command is used to create and start the Listener from the configured template options. This is an alias for the start command.

Merlin[listeners]» use https
Merlin[listeners][https]» run

[!] Insecure publicly distributed Merlin x.509 testing certificate in use for https server on 127.0.0.1:443
Additional details: https://github.com/Ne0nd0g/merlin/wiki/TLS-Certificates

[+] Default listener was created with an ID of: 632db67c-7045-462f-bf09-aea90272aed5
Merlin[listeners][Default]»
[+] Started HTTPS listener on 127.0.0.1:443
Merlin[listeners][Default]»

sessions

See the sessions section

set

The set command is used to set the value of a configurable option for the Listener you are currently interacting with. Use the show command to see a list of configurable options.

Cycle through the available configurable options for the current Listener using the tab key after the set command.

View the Listeners page for additional information on specific listener configurable options.

Merlin[listeners]» use https
Merlin[listeners][https]» set Name Merlin Demo Listener
[+] set Name to: Merlin Demo Listener
Merlin[listeners][https]»

show

The show command is used to display the Listener template configurable options and their current value. View the Listeners page for additional information on specific listener configurable options.

Merlin[listeners][https]» show
+-------------+-----------------------------------------------------------------+
|    NAME     |                              VALUE                              |
+-------------+-----------------------------------------------------------------+
| URLS        | /                                                               |
+-------------+-----------------------------------------------------------------+
| X509Cert    | /home/joe/go/src/github.com/Ne0nd0g/merlin/data/x509/server.crt |
+-------------+-----------------------------------------------------------------+
| Protocol    | https                                                           |
+-------------+-----------------------------------------------------------------+
| Interface   | 127.0.0.1                                                       |
+-------------+-----------------------------------------------------------------+
| Port        | 443                                                             |
+-------------+-----------------------------------------------------------------+
| PSK         | merlin                                                          |
+-------------+-----------------------------------------------------------------+
| X509Key     | /home/joe/go/src/github.com/Ne0nd0g/merlin/data/x509/server.key |
+-------------+-----------------------------------------------------------------+
| Name        | Merlin Demo Listener                                            |
+-------------+-----------------------------------------------------------------+
| Description | Default listener                                                |
+-------------+-----------------------------------------------------------------+
Merlin[listeners][https]»

start

The start command is used to create and start the Listener from the configured template options.

Merlin[listeners]» use https
Merlin[listeners][https]» start

[+] Default listener was created with an ID of: 20b337ba-01d4-44eb-9ebd-cdebf156967e

[+] Started HTTPS listener on 127.0.0.1:443

[!] Insecure publicly distributed Merlin x.509 testing certificate in use for https server on 127.0.0.1:443
Additional details: https://github.com/Ne0nd0g/merlin/wiki/TLS-Certificates
Merlin[listeners][Default]»

!

Merlin» !ip a show ens32

[i] Executing system command...

[+] 2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:z3:ff:91 brd ff:ff:ff:ff:ff:ff
    inet 192.168.211.221/24 brd 192.168.211.255 scope global dynamic noprefixroute ens32
       valid_lft 1227sec preferred_lft 1227sec
    inet6 fe80::a71d:1f6a:a0d1:7985/64 scope link noprefixroute
       valid_lft forever preferred_lft forever

Merlin»

​Main

​help

​back

​configure

​delete

​info

​interact

​list

​main

​sessions

​start

​stop

​use

​!

​Instantiated

​back

​delete

​info

​interact

​main

​restart

​sessions

​set

​show

​start

​status

​stop

​!

​Template

​back

​execute

​info

​interact

​main

​run

​sessions

​set

​show

​start

​!

Main

help

back

configure

delete

info

interact

list

main

sessions

start

stop

use

!

Instantiated

back

delete

info

interact

main

restart

sessions

set

show

start

status

stop

!

Template

back

execute

info

interact

main

run

sessions

set

show

start

!