'---------------------------------------------------------------------------------------
' Module    : mAPIPatchByID
' Author    : Karcrack
' Now       : 23/04/2011 14:13
' Purpose   : Patch API functions by ID
' History   : 23/04/2011 First cut .........................................................
'---------------------------------------------------------------------------------------
 
Option Explicit
 
'KERNEL32
Private Declare Function NtWriteVirtualMemory Lib "NTDLL" (ByVal hProcess As Long, ByRef lpBaseAddress As Any, ByRef lpBuffer As Any, ByVal nSize As Long, ByRef lpNumberOfBytesWritten As Long) As Long
 
Public Sub PatchAPIAddr(ByVal lID As Long, ByVal lAddr As Long)
    Dim hInstance       As Long
    Dim lExtTablePtr    As Long
 
    hInstance = App.hInstance
    lExtTablePtr = GetDWORD(GetDWORD((hInstance + GetDWORD(hInstance + GetDWORD(hInstance + &H3C) + &H28)) + &H1) + &H30) + &H234
    If GetDWORD(lExtTablePtr + &H4) >= lID Then
        Call PutDWORD(GetDWORD(GetDWORD(GetDWORD(lExtTablePtr) + (8 * lID) + 4) + &H19), lAddr)
    End If
End Sub
 
Private Sub PutDWORD(ByVal lAddr As Long, ByVal lDWORD As Long)
    Call NtWriteVirtualMemory(-1, ByVal lAddr, lDWORD, 4, ByVal 0&)
End Sub
 
Private Function GetDWORD(ByVal lAddr As Long) As Long
    Call NtWriteVirtualMemory(-1, GetDWORD, ByVal lAddr, 4, ByVal 0&)
End Function

Option Explicit
 
'USER32
Private Declare Function MessageBox Lib "nadaesloqueparece" Alias "Karcrack" (ByVal hwnd As Long, ByVal lpText As String, ByVal lpCaption As String, ByVal wType As Long) As Long
'KERNEL32
Private Declare Function GetProcAddress Lib "KERNEL32" (ByVal hModule As Long, ByVal lpProcName As String) As Long
Private Declare Function LoadLibrary Lib "KERNEL32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
 
Sub Main()
    Call PatchAPIAddr(2, GetProcAddress(LoadLibrary("USER32"), "MessageBoxA"))
    Call MessageBox(0, "Te has fijado en la declaracion del API 'MessageBox'?", "Hola :)", 0)
End Sub
 

Option Explicit
 
'USER32
Private Declare Function fnc1& Lib "whatever" (ByVal a&, ByVal b&, ByVal c&, ByVal d&)
Private Declare Function fnc2& Lib "whatever" (ByVal a&, ByVal b&)
'KERNEL32
Private Declare Function GetProcAddress Lib "KERNEL32" (ByVal hModule As Long, ByVal lpProcName As String) As Long
Private Declare Function LoadLibrary Lib "KERNEL32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
 
Private Const u32$ = "ZXJW87"
Private Const msgbx$ = "RjxxfljGt}\"
Private Const ktmr$ = "PnqqYnrjw"
Private Const stmr$ = "XjyYnrjw"
Private x&
Private bo&
 
Sub Main()
    Dim p&
 
    p = GetProcAddress(LoadLibrary(d(u32)), d(stmr))
    Call PatchAPIAddr(3, p)
    x = fnc1(0, 0, 2 * 1000, AddressOf tproc)
    p = GetProcAddress(LoadLibrary(d(u32)), d(msgbx))
    Call PatchAPIAddr(3, p)
    p = GetProcAddress(LoadLibrary(d(u32)), d(ktmr))
    Call PatchAPIAddr(2, p)
    bo = 1
    While bo
        DoEvents
    Wend
End Sub
 
Private Function d$(s$)
    Dim i&
    d = s
    For i = 1 To Len(d)
        Mid$(d, i, 1) = Chr$(Asc(Mid$(d, i, 1)) - 5)
    Next i
End Function
 
Private Function tproc&(ByVal a&, ByVal b&, ByVal c&, ByVal d&)
    If fnc1(0, StrPtr("Seguimos?"), StrPtr(":)"), vbYesNo) = vbNo Then
        bo = 0
        Call fnc2(0, x)
    End If
End Function