OllyDbg

逆向MFC編譯的程式


基本上,逆向MFC編譯的程式會比一般Win32 API程式來得困難,原因在於MFC封裝了Win32 API,而程式主體都是以訊息為溝通媒介,因此處理訊息的Callback副程式比較難找,因此,需要使用OllyDbg和IDA Pro一起定位,這樣就可以找出GUI元件對應的處理副程式位置,司徒使用Dingoo A320的Unbrick解說一下過程:

接著用OllyDbg載入

開啟Executable Modules頁面並且Double Click MFC42.DLL

位於MFC42.DLL領空

Ctrl + N開啟API清單並Double Click OnCmdMsg@CCmdTarget副程式(MFC主要處理訊息入口)

OnCmdMsg進入點

F2設定斷點

接著按F9執行

往下找到AfxFindMessageEntry

Shift + F2設定條件斷點,EBX就是訊息種類0x111 = WM_COMMAND

設定後的顏色

接著將進入點的中斷拿掉,不然會一直中斷

接著按F9並且在下圖按鈕上按一下

斷點位於AfxFindMessageEntry(WM_COMMAND)

按一下F8,接著就可以在EAX上看到該處理副程式的位置

接著開啟IDA Pro並載入Unbrick程式,跳到該位址

Message Structure

原定義

struct AFX_MSGMAP_ENTRY {
  int nMessage;
  int nCode;
  int NID;
  int nLastID;
  int* NSIG;
  void* PFN;
};

PFN就是指到副程式位置

Message種類

enum WM_MESSAGES {
  WM_NULL = 0x0000,
  WM_CREATE = 0x0001,
  WM_DESTROY = 0x0002,
  WM_MOVE = 0x0003,
  WM_SIZE = 0x0005,
  WM_ACTIVATE = 0x0006,
  WM_SETFOCUS = 0x0007,
  WM_KILLFOCUS = 0x0008,
  WM_ENABLE = 0x000A,
  WM_SETREDRAW = 0x000B,
  WM_SETTEXT = 0x000C,
  WM_GETTEXT = 0x000D,
  WM_GETTEXTLENGTH = 0x000E,
  WM_PAINT = 0x000F,
  WM_CLOSE = 0x0010,
  WM_QUERYENDSESSION = 0x0011,
  WM_QUERYOPEN = 0x0013,
  WM_ENDSESSION = 0x0016,
  WM_QUIT = 0x0012,
  WM_ERASEBKGND = 0x0014,
  WM_SYSCOLORCHANGE = 0x0015,
  WM_SHOWWINDOW = 0x0018,
  WM_WININICHANGE = 0x001A,
  WM_SETTINGCHANGE = 0x001A,
  WM_DEVMODECHANGE = 0x001B,
  WM_ACTIVATEAPP = 0x001C,
  WM_FONTCHANGE = 0x001D,
  WM_TIMECHANGE = 0x001E,
  WM_CANCELMODE = 0x001F,
  WM_SETCURSOR = 0x0020,
  WM_MOUSEACTIVATE = 0x0021,
  WM_CHILDACTIVATE = 0x0022,
  WM_QUEUESYNC = 0x0023,
  WM_GETMINMAXINFO = 0x0024,
  WM_PAINTICON = 0x0026,
  WM_ICONERASEBKGND = 0x0027,
  WM_NEXTDLGCTL = 0x0028,
  WM_SPOOLERSTATUS = 0x002A,
  WM_DRAWITEM = 0x002B,
  WM_MEASUREITEM = 0x002C,
  WM_DELETEITEM = 0x002D,
  WM_VKEYTOITEM = 0x002E,
  WM_CHARTOITEM = 0x002F,
  WM_SETFONT = 0x0030,
  WM_GETFONT = 0x0031,
  WM_SETHOTKEY = 0x0032,
  WM_GETHOTKEY = 0x0033,
  WM_QUERYDRAGICON = 0x0037,
  WM_COMPAREITEM = 0x0039,
  WM_GETOBJECT = 0x003D,
  WM_COMPACTING = 0x0041,
  WM_COMMNOTIFY = 0x0044,
  WM_WINDOWPOSCHANGING = 0x0046,
  WM_WINDOWPOSCHANGED = 0x0047,
  WM_POWER = 0x0048,
  WM_COPYDATA = 0x004A,
  WM_CANCELJOURNAL = 0x004B,
  WM_NOTIFY = 0x004E,
  WM_INPUTLANGCHANGEREQUEST = 0x0050,
  WM_INPUTLANGCHANGE = 0x0051,
  WM_TCARD = 0x0052,
  WM_HELP = 0x0053,
  WM_USERCHANGED = 0x0054,
  WM_NOTIFYFORMAT = 0x0055,
  WM_CONTEXTMENU = 0x007B,
  WM_STYLECHANGING = 0x007C,
  WM_STYLECHANGED = 0x007D,
  WM_DISPLAYCHANGE = 0x007E,
  WM_GETICON = 0x007F,
  WM_SETICON = 0x0080,
  WM_NCCREATE = 0x0081,
  WM_NCDESTROY = 0x0082,
  WM_NCCALCSIZE = 0x0083,
  WM_NCHITTEST = 0x0084,
  WM_NCPAINT = 0x0085,
  WM_NCACTIVATE = 0x0086,
  WM_GETDLGCODE = 0x0087,
  WM_SYNCPAINT = 0x0088,
  WM_NCMOUSEMOVE = 0x00A0,
  WM_NCLBUTTONDOWN = 0x00A1,
  WM_NCLBUTTONUP = 0x00A2,
  WM_NCLBUTTONDBLCLK = 0x00A3,
  WM_NCRBUTTONDOWN = 0x00A4,
  WM_NCRBUTTONUP = 0x00A5,
  WM_NCRBUTTONDBLCLK = 0x00A6,
  WM_NCMBUTTONDOWN = 0x00A7,
  WM_NCMBUTTONUP = 0x00A8,
  WM_NCMBUTTONDBLCLK = 0x00A9,
  WM_NCXBUTTONDOWN = 0x00AB,
  WM_NCXBUTTONUP = 0x00AC,
  WM_NCXBUTTONDBLCLK = 0x00AD,
  WM_INPUT = 0x00FF,
  WM_KEYFIRST = 0x0100,
  WM_KEYDOWN = 0x0100,
  WM_KEYUP = 0x0101,
  WM_CHAR = 0x0102,
  WM_DEADCHAR = 0x0103,
  WM_SYSKEYDOWN = 0x0104,
  WM_SYSKEYUP = 0x0105,
  WM_SYSCHAR = 0x0106,
  WM_SYSDEADCHAR = 0x0107,
  WM_UNICHAR = 0x0109,
  WM_KEYLAST_NT501 = 0x0109,
  WM_KEYLAST_PRE501 = 0x0108,
  WM_IME_STARTCOMPOSITION = 0x010D,
  WM_IME_ENDCOMPOSITION = 0x010E,
  WM_IME_COMPOSITION = 0x010F,
  WM_IME_KEYLAST = 0x010F,
  WM_INITDIALOG = 0x0110,
  WM_COMMAND = 0x0111,
  WM_SYSCOMMAND = 0x0112,
  WM_TIMER = 0x0113,
  WM_HSCROLL = 0x0114,
  WM_VSCROLL = 0x0115,
  WM_INITMENU = 0x0116,
  WM_INITMENUPOPUP = 0x0117,
  WM_MENUSELECT = 0x011F,
  WM_MENUCHAR = 0x0120,
  WM_ENTERIDLE = 0x0121,
  WM_MENURBUTTONUP = 0x0122,
  WM_MENUDRAG = 0x0123,
  WM_MENUGETOBJECT = 0x0124,
  WM_UNINITMENUPOPUP = 0x0125,
  WM_MENUCOMMAND = 0x0126,
  WM_CHANGEUISTATE = 0x0127,
  WM_UPDATEUISTATE = 0x0128,
  WM_QUERYUISTATE = 0x0129,
  WM_CTLCOLORMSGBOX = 0x0132,
  WM_CTLCOLOREDIT = 0x0133,
  WM_CTLCOLORLISTBOX = 0x0134,
  WM_CTLCOLORBTN = 0x0135,
  WM_CTLCOLORDLG = 0x0136,
  WM_CTLCOLORSCROLLBAR = 0x0137,
  WM_CTLCOLORSTATIC = 0x0138,
  WM_MOUSEFIRST = 0x0200,
  WM_MOUSEMOVE = 0x0200,
  WM_LBUTTONDOWN = 0x0201,
  WM_LBUTTONUP = 0x0202,
  WM_LBUTTONDBLCLK = 0x0203,
  WM_RBUTTONDOWN = 0x0204,
  WM_RBUTTONUP = 0x0205,
  WM_RBUTTONDBLCLK = 0x0206,
  WM_MBUTTONDOWN = 0x0207,
  WM_MBUTTONUP = 0x0208,
  WM_MBUTTONDBLCLK = 0x0209,
  WM_MOUSEWHEEL = 0x020A,
  WM_XBUTTONDOWN = 0x020B,
  WM_XBUTTONUP = 0x020C,
  WM_XBUTTONDBLCLK = 0x020D,
  WM_MOUSELAST_5 = 0x020D,
  WM_MOUSELAST_4 = 0x020A,
  WM_MOUSELAST_PRE_4 = 0x0209,
  WM_PARENTNOTIFY = 0x0210,
  WM_ENTERMENULOOP = 0x0211,
  WM_EXITMENULOOP = 0x0212,
  WM_NEXTMENU = 0x0213,
  WM_SIZING = 0x0214,
  WM_CAPTURECHANGED = 0x0215,
  WM_MOVING = 0x0216,
  WM_POWERBROADCAST = 0x0218,
  WM_DEVICECHANGE = 0x0219,
  WM_MDICREATE = 0x0220,
  WM_MDIDESTROY = 0x0221,
  WM_MDIACTIVATE = 0x0222,
  WM_MDIRESTORE = 0x0223,
  WM_MDINEXT = 0x0224,
  WM_MDIMAXIMIZE = 0x0225,
  WM_MDITILE = 0x0226,
  WM_MDICASCADE = 0x0227,
  WM_MDIICONARRANGE = 0x0228,
  WM_MDIGETACTIVE = 0x0229,
  WM_MDISETMENU = 0x0230,
  WM_ENTERSIZEMOVE = 0x0231,
  WM_EXITSIZEMOVE = 0x0232,
  WM_DROPFILES = 0x0233,
  WM_MDIREFRESHMENU = 0x0234,
  WM_IME_SETCONTEXT = 0x0281,
  WM_IME_NOTIFY = 0x0282,
  WM_IME_CONTROL = 0x0283,
  WM_IME_COMPOSITIONFULL = 0x0284,
  WM_IME_SELECT = 0x0285,
  WM_IME_CHAR = 0x0286,
  WM_IME_REQUEST = 0x0288,
  WM_IME_KEYDOWN = 0x0290,
  WM_IME_KEYUP = 0x0291,
  WM_MOUSEHOVER = 0x02A1,
  WM_MOUSELEAVE = 0x02A3,
  WM_NCMOUSEHOVER = 0x02A0,
  WM_NCMOUSELEAVE = 0x02A2,
  WM_WTSSESSION_CHANGE = 0x02B1,
  WM_TABLET_FIRST = 0x02c0,
  WM_TABLET_LAST = 0x02df,
  WM_CUT = 0x0300,
  WM_COPY = 0x0301,
  WM_PASTE = 0x0302,
  WM_CLEAR = 0x0303,
  WM_UNDO = 0x0304,
  WM_RENDERFORMAT = 0x0305,
  WM_RENDERALLFORMATS = 0x0306,
  WM_DESTROYCLIPBOARD = 0x0307,
  WM_DRAWCLIPBOARD = 0x0308,
  WM_PAINTCLIPBOARD = 0x0309,
  WM_VSCROLLCLIPBOARD = 0x030A,
  WM_SIZECLIPBOARD = 0x030B,
  WM_ASKCBFORMATNAME = 0x030C,
  WM_CHANGECBCHAIN = 0x030D,
  WM_HSCROLLCLIPBOARD = 0x030E,
  WM_QUERYNEWPALETTE = 0x030F,
  WM_PALETTEISCHANGING = 0x0310,
  WM_PALETTECHANGED = 0x0311,
  WM_HOTKEY = 0x0312,
  WM_PRINT = 0x0317,
  WM_PRINTCLIENT = 0x0318,
  WM_APPCOMMAND = 0x0319,
  WM_THEMECHANGED = 0x031A,
  WM_HANDHELDFIRST = 0x0358,
  WM_HANDHELDLAST = 0x035F,
  WM_AFXFIRST = 0x0360,
  WM_AFXLAST = 0x037F,
  WM_PENWINFIRST = 0x0380,
  WM_PENWINLAST = 0x038F,
  WM_APP = 0x8000,
  WM_USER = 0x0400};


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