文章摘要
这篇文章是用C语言实现的一个恶意软件钩子函数，主要用于在Windows系统内拦截恶意软件调用，恢复被破坏的内存和对话框参数。文章通过定义了一系列宏和函数（如`MoveMemory`、`VirtualProtect`、`GetModuleHandleA`等），并利用对话框参数钩子（`MyDialogBoxParam`）在特定条件下调用`RecoverBytes`函数来恢复被破坏的内存区域。最终在钩子函数被激活时，通过`Crack`函数显示消息框“破解成功”。文章的核心目的是实现一个简单的恶意软件检测和恢复机制。
Option Explicit
Private Declare Sub MoveMemory Lib “kernel32” Alias “RtlMoveMemory” (Destination As Long, Source As Long, ByVal Length As Long)
Private Declare Function VirtualProtect Lib “kernel32” (lpAddress As Long, ByVal dwSize As Long, ByVal flNewProtect As Long, lpflOldProtect As Long) As Long
Private Declare Function GetModuleHandleA Lib “kernel32” (ByVal lpModuleName As String) As Long
Private Declare Function GetProcAddress Lib “kernel32” (ByVal hModule As Long, ByVal lpProcName As String) As Long
Private Declare Function DialogBoxParam Lib “user32” Alias “DialogBoxParamA” (ByVal hInstance As Long, ByVal pTemplateName As Long, ByVal hWndParent As Long, ByVal lpDialogFunc As Long, ByVal dwInitParam As Long) As Integer
Dim HookBytes(0 To 5) As Byte
Dim OriginBytes(0 To 5) As Byte
Dim pFunc As Long
Dim Flag As Boolean
Private Function GetPtr(ByVal Value As Long) As Long
GetPtr=Value
End Function
Public Sub RecoverBytes()
If Flag Then MoveMemory ByVal pFunc, ByVal VarPtr(OriginBytes(0)), 6
End Sub
Public Function Hook() As Boolean
Dim TmpBytes(0 To 5) As Byte
Dim p As Long
Dim OriginProtect As Long
Hook=False
pFunc=GetProcAddress(GetModuleHandleA(“user32.dll”), “DialogBoxParamA”)
If VirtualProtect(ByVal pFunc, 6, &H40, OriginProtect) <> 0 Then
MoveMemory ByVal VarPtr(TmpBytes(0)), ByVal pFunc, 6
If TmpBytes(0) <> &H68 Then
MoveMemory ByVal VarPtr(OriginBytes(0)), ByVal pFunc, 6
p=GetPtr(AddressOf MyDialogBoxParam)
HookBytes(0)=&H68
MoveMemory ByVal VarPtr(HookBytes(1)), ByVal VarPtr(p), 4
HookBytes(5)=&HC3
MoveMemory ByVal pFunc, ByVal VarPtr(HookBytes(0)), 6
Flag=True
Hook=True
End If
End If
End Function
Private Function MyDialogBoxParam(ByVal hInstance As Long, _
ByVal pTemplateName As Long, ByVal hWndParent As Long, _
ByVal lpDialogFunc As Long, ByVal dwInitParam As Long) As Integer
If pTemplateName=4070 Then
MyDialogBoxParam=1
Else
RecoverBytes
MyDialogBoxParam=DialogBoxParam(hInstance, pTemplateName, hWndParent, lpDialogFunc, dwInitParam)
Hook
End If
End Function
Sub Crack()
If Hook Then MsgBox “破解成功”
End Sub