When faced with a "live" or "dead" listing of the target program, the reverse-engineer
is like a surgeon to whom the most intricate details of the physiology of his patient
must be known, if there is to be any chance of success. What follows below is the
equivalent of an anatomy primer for the reverse engineer: a summary of the Win32 PE file
header and format, and three examples of the source code of a PE executable: the first
a simple C++ program, the second a rudimentary Windows program written in assembly
language, and the third being a disassembly--via W32Dasm--of the C++ program. It is hoped
that by reviewing and comparing these the reverse-engineer will become familiar with
the fundamental structures and "organs" of his target, and thus be prepared to patch and
"heal" effectively any crippled programs that come his way.
"In the beginning", there were two types of executable files: .COM files (single-segment executables), and .EXE files (multiple-segment executables). COM files needed no file header as they were only a single segment in size, and thus were written directly into the first segment of memory available. EXE files, however, would often cover multiple segments; as a result, they contained a 64-byte file header which provided the OS with information about how many segments were needed and how they would be allocated.
The Windows OS was developed with the idea that executable files would rely on a core collection of OS functions (an "API"); as the programs were no longer handling things like keyboard input, mouse tracking, and screen output internally, and as they were expected to share memory with multiple other programs runninf simultaneously, they needed to provide more information to the OS in order to make communication with the OS both possible and efficient (whereas DOS programs often ignored the OS entirely). Thus came about the NE, LZ and now the PE file formats and their subsequent headers: the file format imposes structure on the executable file, and the file header diagrams that structure. Armed with a firm knowledge of the PE file header and format, one can make a surprising number of changes on a PE file with only a hex editor (hopefully one that parses the PE header, such as Hiew 5.66).
The PE file header begins with the MS-DOS MZ Header:
MZ Header WORD e_magic; // Magic number WORD e_cblp; // Bytes on last page of file WORD e_cp; // Pages in file WORD e_crlc; // Relocations WORD e_cparhdr; // Size of header in paragraphs WORD e_minalloc; // Minimum extra paragraphs needed WORD e_maxalloc; // Maximum extra paragraphs needed WORD e_ss; // Initial (relative) SS value WORD e_sp; // Initial SP value WORD e_csum; // Checksum WORD e_ip; // Initial IP value WORD e_cs; // Initial (relative) CS value WORD e_lfarlc; // File address of relocation table WORD e_ovno; // Overlay number WORD e_res[4]; // Reserved words WORD e_oemid; // OEM identifier (for e_oeminfo) WORD e_oeminfo; // OEM information; e_oemid specific WORD e_res2[10]; // Reserved words DWORD e_lfanew; // File address of new exe headerThis is followed by a "stub" program (such as winstub.exe) that executes if the program is run outside of Windows; usually this is a simple "This program require MS-Windows to run." message, but it can be cusomized by the programmer to say or do anything--in fact one could even write a DOS-mode version of the program that executes whenever the file is run in DOS, thus making it more portable (funny, no-one ever seems to take the time to do this). After the "stub" comes the signature 00004550 (which in a hex editor will appear Hex 50 45 00 00, ASCII "PE.."), then the PE file header:
PE File Header examples given are from Notepad.exe) WORD Machine Type ( 014C ); WORD Number of Sections ( 0006 ); DWORD Time/Date Stamp ( 2FF3548D ); DWORD Pointer To Symbol Table ( 00000000 ); DWORD Number Of Symbols ( 00000000 ); WORD Size Of Optional Header ( 00E0 ); WORD Characteristics ( 010E ); PE Optional Header WORD Magic ( 010B ); BYTE MajorLinkerVersion ( 02 ); BYTE MinorLinkerVersion ( 32 ); DWORD SizeOfCode ( 00003A00 ); DWORD SizeOfInitializedData ( 00004800 ); DWORD SizeOfUninitializedData ( 00000600 ); DWORD AddressOfEntryPoint ( 00001000 ); DWORD BaseOfCode ( 00001000 ); DWORD BaseOfData ( 00005000 ); ----NT Optional Fields (used only by Windows NT)---- DWORD ImageBase; DWORD SectionAlignment; DWORD FileAlignment; WORD MajorOperatingSystemVersion; WORD MinorOperatingSystemVersion; WORD MajorImageVersion; WORD MinorImageVersion; WORD MajorSubsystemVersion; WORD MinorSubsystemVersion; DWORD Reserved1; DWORD SizeOfImage; DWORD SizeOfHeaders; DWORD CheckSum; WORD Subsystem; WORD DllCharacteristics; DWORD SizeOfStackReserve; DWORD SizeOfStackCommit; DWORD SizeOfHeapReserve; DWORD SizeOfHeapCommit; DWORD LoaderFlags; DWORD NumberOfRvaAndSizes;Immediately after the PE File Header (remember to add the Header Size to the offset of the start of the header in order to jump over the 00 bytes filling in the NT optional fields) come the Section Headers:
Section Header BYTE Name[IMAGE_SIZEOF_SHORT_NAME]; DWORD PhysicalAddress; DWORD VirtualSize; DWORD VirtualAddress; DWORD SizeOfRawData; DWORD PointerToRawData; DWORD PointerToRelocations; DWORD PointerToLinenumbers; WORD NumberOfRelocations; WORD NumberOfLinenumbers; DWORD Characteristics;Note that there is one Section Header per section; thus, according to the PE Header for Notepad.exe, there will be 06 Section Headers. Each section contains its name in ASCII (e.g. ".text") and a pointer to its location; the headers are 40 bytes apiece and there is no "padding" between them. The sections that are commonly present in an executable are:
Note that not all of these sections need be present. When searching for a specific section, it is possible to bypass the PE header entirely and start parsing the section headers by searching for the section name in the ASCII window of a hex editor.
Executable code section: .text
This section contains the program code as well as the "fixup" jump table. There is no format to the .text section saving that imposed upon the binary code itself.
Data sections: .bss, .rdata, .data
There are three types of data sections: .bss, which contains uninitialized data (including all variables declared as static); .rata, which contains read-only data (such as strings, and constants); and .data, which contains global variables for the program. These sections have no real structure.
The .rsrc section contains all of the resources for the application. The first 16 bytes of the .rsrc section contain the Resource Directory Header:
Resource Directory DWORD Characteristics; DWORD TimeDateStamp; WORD MajorVersion; WORD MinorVersion; WORD NumberOfNamedEntries; WORD NumberOfIdEntries;Which is immediately followed by the number of Directory Entries specified in NumberOfNamedEntries + NumberOfIdEntries:
Resource Directory Entry DWORD Name; DWORD OffsetToData;The Name of a Directory Entry determines the type of the resource (as defined in winuser.h), while the Offset points either to another Resource Directory Entry (the usual structure is 1 Resource Directory containing the Resource type pointing to 1 Resource Directory (or subdirectory) containing the Resource ID # and pointing to the Resource Data Entry), or to a Resource Data Entry:
Resource Data Entry DWORD OffsetToData; DWORD Size; DWORD CodePage; DWORD Reserved;The Resource Data Entry contains the size and offset of the actual resource data, which will be a list of unicode strings for a String Table, a binary image for a bitmap, or a list of values and strings for a dialog box. Information on the format of the binary resource content can be found in Micro$oft's Win32 Binary Resource Formats document.
The .edata section contains the exported data and functions for an application or library (.DLL). The section begins with the Export Directory:
Export Directory DWORD Characteristics; DWORD TimeDateStamp; WORD MajorVersion; WORD MinorVersion; DWORD Name; DWORD Base; DWORD NumberOfFunctions; DWORD NumberOfNames; DWORD *AddressOfFunctions; DWORD *AddressOfNames; WORD *AddressOfNameOrdinals;The last three fields contain pointers to a list of exported function entry points, a null-seperated list of function names, and a list of ordinal values for the functions. Note that these pointers assume the program is loaded; to find the lists within the file, one has to subtract the Section Header Virtual Address from the AddressOf... field, then add the PointerToRawData address to the result.
This section contains the list of functions imported into the program. It begins with the Import Directory:
Import Directory DWORD dwRVAFunctionNameList; DWORD dwUseless1; DWORD dwUseless2; DWORD dwRVAModuleName; DWORD dwRVAFunctionAddressList;The last two fields are repeated for each application or library that the program imports from; the order is a little strange as one may notice in a hexeditor: the name of the first function imported from a module is given, then the module name is given, then any remaining functions imported from that module are given. The list of imports repeats until there is a null entry.
Debug information section: .debug
This section contains the debug information for the program, if the compiler was set to provide this. It begins with a Debug Directory:
Debug Directory DWORD Characteristics; DWORD TimeDateStamp; WORD MajorVersion; WORD MinorVersion; DWORD Type; DWORD SizeOfData; DWORD AddressOfRawData; DWORD PointerToRawData;The different types of debug information are defined in winuser.h; any further structure imposed on each type of debug information is defined there as well.
Modifying the PE File Header
Since the PE Header gives the starting address and size of each of its various sections (and, as in the case of the .rsrc section, the size of the actual data), it is a simple enough if tedious matter to modify the contents of the PE Header beyond its original size by adjusting the offset fields of each section following that which was modified. To add additional code one must extend the .text section and repair every section thereafter; to add or modify resources one must modify each subdirectory of the .rsrc section and repair every section that comes afterwards (this is how BRW and Resource Studio work). It would make sense, then, when changing any section to move its Virtual Address to the end of the PE file, and extend the section before it to cover the resultant gap which should, of course, be padded with 00 bytes. Note that this is somewhat dicey, especially with the .text and .idata sections, and it increases the size of the executable quite a bit...however it is the quickets and easiest method in some cases, as only two sections need to be repaired (one padded & extended, the other "moved" one modified in every "offset to..." field). An alternative, if the added information is to be data referenced directly by the program (and this may make it desireable to place executable code in the data directories, then refer to it by offset from within the program and insert it into the executable), is to append the data to the last section and extend that section to cover the data.
What follows is a typical C++ "hello world" program, snagged from the source code of some book or another on Windows 95 programming. It contains the essential components of any Windows 95 application, notably:
// winhello.asm *** displays an idiotic "Hello World!" message in an otherwise empty window. #define IDM_NEW 1 #define IDM_OPEN 2 #define IDM_SAVE 3 #define IDM_SAVEAS 4 #define IDM_PRINT 5 #define IDM_EXIT 6 #define IDM_CUT 10 #define IDM_COPY 11 #define IDM_PASTE 12 #define IDM_ABOUT 20 #include#include #include #include "hello3.h" HMODULE ghModule; LRESULT CALLBACK WndProc(HWND, UINT, UINT, LONG); BOOL CALLBACK AboutDlgProc(HWND, UINT, UINT, LONG); int APIENTRY WinMain(HMODULE hModule, HINSTANCE hNull, PSTR pszCmdLine, int nCmdShow) { WNDCLASS wc; MSG msg; HWND hWnd; wc.style = CS_HREDRAW | CS_VREDRAW; wc.lpfnWndProc = (WNDPROC)WndProc; wc.cbClsExtra = 0; wc.cbWndExtra = 0; wc.hInstance = hModule; wc.hIcon = LoadIcon(NULL, IDI_APPLICATION); wc.hCursor = LoadCursor(NULL, IDC_ARROW); wc.hbrBackground = GetStockObject(WHITE_BRUSH); wc.lpszMenuName = "Hello3Menu"; wc.lpszClassName = "Hello3"; RegisterClass(&wc); ghModule = hModule; hWnd = CreateWindow("Hello3", "HELLO3", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hModule, NULL); ShowWindow(hWnd, nCmdShow); UpdateWindow(hWnd); while ( GetMessage(&msg, NULL, 0, 0) ) { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam; } LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, UINT wParam, LONG lParam) { OPENFILENAME ofn; PRINTDLG pd; HDC hDC; PAINTSTRUCT ps; RECT rect; char szTitle[20]; switch(uMsg) { case WM_COMMAND: switch(LOWORD(wParam)) { case IDM_NEW: strcpy(szTitle, "New"); break; case IDM_OPEN: memset(&ofn, 0, sizeof(OPENFILENAME)); ofn.lStructSize = sizeof(OPENFILENAME); ofn.hwndOwner = hWnd; ofn.lpstrFilter = "All Files\0*.*\0"; GetOpenFileName(&ofn); return 0; case IDM_SAVE: strcpy(szTitle, "Save"); break; case IDM_SAVEAS: memset(&ofn, 0, sizeof(OPENFILENAME)); ofn.lStructSize = sizeof(OPENFILENAME); ofn.hwndOwner = hWnd; ofn.lpstrFilter = "All Files\0*.*\0"; GetSaveFileName(&ofn); return 0; case IDM_PRINT: memset(&pd, 0, sizeof(PRINTDLG)); pd.lStructSize = sizeof(PRINTDLG); pd.hwndOwner = hWnd; PrintDlg(&pd); return 0; case IDM_EXIT: SendMessage(hWnd, WM_CLOSE, 0, 0L); return 0; case IDM_CUT: strcpy(szTitle, "Cut"); break; case IDM_COPY: strcpy(szTitle, "Copy"); break; case IDM_PASTE: // grayed break; case IDM_ABOUT: DialogBox(ghModule, "AboutBox", hWnd, AboutDlgProc); return 0; } MessageBox(hWnd, "Not Implemented", szTitle, MB_ICONINFORMATION | MB_OK); return 0; case WM_PAINT: hDC = BeginPaint(hWnd, &ps); GetClientRect(hWnd, &rect); DrawText(hDC, "Hello, World!", -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER); EndPaint(hWnd, &ps); return 0; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hWnd, uMsg, wParam, lParam); } BOOL CALLBACK AboutDlgProc(HWND hDlg, UINT uMsg, UINT wParam, LONG lParam) { switch(uMsg) { case WM_INITDIALOG: return TRUE; case WM_COMMAND: switch(LOWORD(wParam)) { case IDOK: case IDCANCEL: EndDialog(hDlg, TRUE); return TRUE; } break; } return FALSE; }
Below is the assembly-code generated from the above C++ program by using the "compile as ASM" option on the C++ compiler to generate assembly language output. Note the difference between this and Human generated assembly and decompiler-generated assembly. The compiler-generated assembly code has the following structures to match the C++ source:
_TEXT segment dword use32 public 'CODE' ;size is 848 _TEXT ends _DATA segment dword use32 public 'DATA' ;size is 180 _DATA ends CONST segment dword use32 public 'CONST' ;size is 0 CONST ends _BSS segment dword use32 public 'BSS' ;size is 0 _BSS ends FLAT group comm near _ghModule:byte:04h includelib SNN.lib extrn __acrtused extrn __imp__EndDialog@8 extrn __imp__DialogBoxParamA@20 extrn _strcpy extrn __imp__SendMessageA@16 extrn _PrintDlgA@4 extrn _memset extrn _GetSaveFileNameA@4 extrn _GetOpenFileNameA@4 extrn __imp__DefWindowProcA@16 extrn __imp__PostQuitMessage@4 extrn __imp__EndPaint@8 extrn __imp__DrawTextA@20 extrn __imp__GetClientRect@8 extrn __imp__BeginPaint@8 extrn __imp__MessageBoxA@16 extrn __imp__GetMessageA@16 extrn __imp__DispatchMessageA@4 extrn __imp__TranslateMessage@4 extrn __imp__UpdateWindow@4 extrn __imp__ShowWindow@8 extrn __imp__CreateWindowExA@48 extrn __imp__RegisterClassA@4 extrn __imp__GetStockObject@4 extrn __imp__LoadCursorA@8 extrn __imp__LoadIconA@8 public _WinMain@16,_WndProc@16,_AboutDlgProc@16 _TEXT segment assume CS:_TEXT _WinMain@16: push EBP mov EBP,ESP sub ESP,044h push EBX push ESI mov EBX,8[EBP] mov dword ptr -044h[EBP],3 mov ECX,offset FLAT:_WndProc@16 mov -040h[EBP],ECX xor ECX,ECX mov -03Ch[EBP],ECX mov -038h[EBP],ECX mov -034h[EBP],EBX push 07F00h push ECX call dword ptr __imp__LoadIconA@8 mov -030h[EBP],EAX push 07F00h push 0 call dword ptr __imp__LoadCursorA@8 mov -02Ch[EBP],EAX push 0 call dword ptr __imp__GetStockObject@4 mov -028h[EBP],EAX mov dword ptr -024h[EBP],offset FLAT:_DATA[0Eh] mov dword ptr -020h[EBP],offset FLAT:_DATA lea ECX,-044h[EBP] push ECX call dword ptr __imp__RegisterClassA@4 mov _ghModule,EBX push dword ptr 014h[EBP] push 0 push EBX push 0 push 0 push 080000000h push 080000000h push 080000000h push 080000000h push 0CF0000h push offset FLAT:_DATA[7] push offset FLAT:_DATA push 0 call dword ptr __imp__CreateWindowExA@48 mov ESI,EAX push ESI call dword ptr __imp__ShowWindow@8 push ESI call dword ptr __imp__UpdateWindow@4 push 0 push 0 push 0 lea ECX,-01Ch[EBP] push ECX call dword ptr __imp__GetMessageA@16 test EAX,EAX je LEE LC6: lea EAX,-01Ch[EBP] push EAX call dword ptr __imp__TranslateMessage@4 lea EAX,-01Ch[EBP] push EAX call dword ptr __imp__DispatchMessageA@4 push 0 push 0 push 0 lea EAX,-01Ch[EBP] push EAX call dword ptr __imp__GetMessageA@16 test EAX,EAX jne LC6 LEE: mov EAX,-014h[EBP] pop ESI pop EBX mov ESP,EBP pop EBP ret 010h _WndProc@16: push EBP mov EBP,ESP sub ESP,0F4h push EBX push ESI mov ESI,8[EBP] mov EAX,0Ch[EBP] cmp EAX,0111h je L124 cmp EAX,0Fh je L164 cmp EAX,2 je L1A5 jmp near ptr L1B7 L124: movzx EBX,word ptr 010h[EBP] sub EBX,1 cmp EBX,013h ja L148 jmp dword ptr FLAT:_DATA[064h][EBX*4] push offset FLAT:_DATA[019h] lea EAX,-014h[EBP] push EAX call near ptr _strcpy add ESP,8 L148: push 040h lea EAX,-014h[EBP] push EAX push offset FLAT:_DATA[01Dh] push ESI call dword ptr __imp__MessageBoxA@16 xor EAX,EAX pop ESI pop EBX mov ESP,EBP pop EBP ret 010h L164: lea ECX,-064h[EBP] push ECX push ESI call dword ptr __imp__BeginPaint@8 mov EBX,EAX lea ECX,-024h[EBP] push ECX push ESI call dword ptr __imp__GetClientRect@8 push 025h lea ECX,-024h[EBP] push ECX push 0FFFFFFFFh push offset FLAT:_DATA[02Dh] push EBX call dword ptr __imp__DrawTextA@20 lea ECX,-064h[EBP] push ECX push ESI call dword ptr __imp__EndPaint@8 xor EAX,EAX pop ESI pop EBX mov ESP,EBP pop EBP ret 010h L1A5: push 0 call dword ptr __imp__PostQuitMessage@4 xor EAX,EAX pop ESI pop EBX mov ESP,EBP pop EBP ret 010h L1B7: push dword ptr 014h[EBP] push dword ptr 010h[EBP] push dword ptr 0Ch[EBP] push ESI call dword ptr __imp__DefWindowProcA@16 pop ESI pop EBX mov ESP,EBP pop EBP ret 010h push 04Ch push 0 lea EAX,-0F4h[EBP] push EAX call near ptr _memset mov dword ptr -0F4h[EBP],04Ch mov -0F0h[EBP],ESI mov dword ptr -0E8h[EBP],offset FLAT:_DATA[03Bh] lea EAX,-0F4h[EBP] push EAX call near ptr _GetOpenFileNameA@4 add ESP,0Ch xor EAX,EAX pop ESI pop EBX mov ESP,EBP pop EBP ret 010h push offset FLAT:_DATA[04Ah] lea EAX,-014h[EBP] push EAX call near ptr _strcpy add ESP,8 jmp near ptr L148 push 04Ch push 0 lea EAX,-0F4h[EBP] push EAX call near ptr _memset mov dword ptr -0F4h[EBP],04Ch mov -0F0h[EBP],ESI mov dword ptr -0E8h[EBP],offset FLAT:_DATA[03Bh] lea EAX,-0F4h[EBP] push EAX call near ptr _GetSaveFileNameA@4 add ESP,0Ch xor EAX,EAX pop ESI pop EBX mov ESP,EBP pop EBP ret 010h push 042h push 0 lea EAX,-0A8h[EBP] push EAX call near ptr _memset mov dword ptr -0A8h[EBP],042h mov -0A4h[EBP],ESI lea EAX,-0A8h[EBP] push EAX call near ptr _PrintDlgA@4 add ESP,0Ch xor EAX,EAX pop ESI pop EBX mov ESP,EBP pop EBP ret 010h push 0 push 0 push 010h push ESI call dword ptr __imp__SendMessageA@16 xor EAX,EAX pop ESI pop EBX mov ESP,EBP pop EBP ret 010h push offset FLAT:_DATA[04Fh] lea EAX,-014h[EBP] push EAX call near ptr _strcpy add ESP,8 jmp near ptr L148 push offset FLAT:_DATA[053h] lea EAX,-014h[EBP] push EAX call near ptr _strcpy add ESP,8 jmp near ptr L148 push 0 push offset FLAT:_AboutDlgProc@16 push ESI push offset FLAT:_DATA[058h] push dword ptr _ghModule call dword ptr __imp__DialogBoxParamA@20 xor EAX,EAX pop ESI pop EBX mov ESP,EBP pop EBP ret 010h _AboutDlgProc@16: mov EAX,8[ESP] cmp EAX,0110h je L31E cmp EAX,0111h je L326 jmp short L34B L31E: mov EAX,1 ret 010h L326: movzx EAX,word ptr 0Ch[ESP] cmp EAX,1 je L337 cmp EAX,2 je L337 jmp short L34B L337: push 1 push dword ptr 8[ESP] call dword ptr __imp__EndDialog@8 mov EAX,1 ret 010h L34B: xor EAX,EAX ret 010h _TEXT ends _DATA segment D0 db 048h,065h,06ch,06ch,06fh,033h,000h D7 db 048h db 045h,04ch,04ch,04fh,033h,000h DE db 048h,065h db 06ch,06ch,06fh,033h,04dh,065h,06eh,075h db 000h D19 db 04eh,065h,077h,000h D1D db 04eh,06fh,074h db 020h,049h,06dh,070h,06ch,065h,06dh,065h db 06eh,074h,065h,064h,000h D2D db 048h,065h,06ch db 06ch,06fh,02ch,020h,057h,06fh,072h,06ch db 064h,021h,000h D3B db 041h,06ch,06ch,020h,046h db 069h,06ch,065h,073h,000h,02ah,02eh,02ah db 000h,000h D4A db 053h,061h,076h,065h,000h D4F db 043h db 075h,074h,000h D53 db 043h,06fh,070h,079h,000h D58 db 041h,062h,06fh,075h,074h,042h,06fh,078h db 000h,000h,000h,000h dd offset FLAT:_WndProc@16[0137h] dd offset FLAT:_WndProc@16[01CFh] dd offset FLAT:_WndProc@16[0212h] dd offset FLAT:_WndProc@16[0228h] dd offset FLAT:_WndProc@16[026Bh] dd offset FLAT:_WndProc@16[02A4h] dd offset FLAT:_WndProc@16[0148h] dd offset FLAT:_WndProc@16[0148h] dd offset FLAT:_WndProc@16[0148h] dd offset FLAT:_WndProc@16[02BBh] dd offset FLAT:_WndProc@16[02D1h] dd offset FLAT:_WndProc@16[0148h] dd offset FLAT:_WndProc@16[0148h] dd offset FLAT:_WndProc@16[0148h] dd offset FLAT:_WndProc@16[0148h] dd offset FLAT:_WndProc@16[0148h] dd offset FLAT:_WndProc@16[0148h] dd offset FLAT:_WndProc@16[0148h] dd offset FLAT:_WndProc@16[0148h] dd offset FLAT:_WndProc@16[02E7h] _DATA ends CONST segment CONST ends _BSS segment _BSS ends end
The following is the "hello3.asm" file from Barry Kauler's fantastic book (requires windows.inc). It too contains the essential components of any Windows 95 application, though they of course look a little different:
--------------[ Header File ]-------------------
#define IDM_QUIT 100
#define IDM_ABOUT 101
winhullo MENU
BEGIN
POPUP "File"
BEGIN
MENUITEM "Quit", IDM_QUIT
MENUITEM "About...", IDM_ABOUT
END
END
------------------------------------------------
.MODEL SMALL
INCLUDE WINDOWS.INC
IDM_QUIT EQU 100 ;menu-identifiers -- must be
IDM_ABOUT EQU 101 ;same as defined in .RC file.
.DATA
szwintitle DB 'HULLO DEMO PROGRAM',0
szwinhulloname DB 'WINHULLO',0
hOemFont DW 0 ;handle to OEM font.
soutstring DB 'Hullo World'
szaboutstr DB 'Assembly Language Windows Demo',0 ;messagebox
sztitlestr DB 'Karda Prints',0 ; /
.CODE
PUBLIC WINMAIN
WINMAIN PROC NEAR PASCAL, hInstance:WORD,hPrevInstance:WORD,lpCmdLine:LPSTR, \
nCmdShow:SWORD
;Define all 'automatic' data...
LOCAL @hWnd:HWND
;window class structure for REGISTERCLASS()....
LOCAL s1:WNDCLASS
;message structure for GETMESSAGE()...
LOCAL s2:MSG
cmp hPrevInstance,0 ;=0 if no previous instance.
je yes1st
jmp createwin
yes1st:
;Setup the window class structure for REGISTERCLASS()...
mov s1.Style,3
lea di,s1.lpfnwndproc
mov [di],OFFSET WinHulloProc
mov [di+2],SEG WinHulloProc
mov s1.CbClsExtra,0
mov s1.CbWndExtra,0
mov ax,hInstance
mov s1.HInstance,ax
invoke LOADICON,null, IDI_APPLICATION
mov s1.@HIcon,ax
invoke LOADCURSOR,null, IDC_ARROW
mov s1.@HCursor,ax
mov s1.hbrBackground,COLOR_BACKGROUND
mov ax,OFFSET szwinhulloname
lea di,s1.lpszmenuname
mov [di],ax
mov [di+2],ds
lea di,s1.lpszclassname
mov [di],ax
mov [di+2],ds
lea ax,s1
invoke REGISTERCLASS,ss::ax
or ax,ax
jne createwin
jmp quitwinmain
createwin:
invoke CREATEWINDOW, ADDR szwinhulloname, ADDR szwintitle, 00CF0000h,\
150, 0, 400, 300, 0, 0, hInstance, 0
mov @hWnd,ax
invoke SHOWWINDOW,ax,nCmdShow
invoke UPDATEWINDOW,@hWnd
jmp SHORT messageloop ;go to the main message-loop.
;This is the main message loop, in which Windows waits for messages
mainloop:
lea ax,s2
invoke TRANSLATEMESSAGE,ss::ax
lea ax,s2
invoke DISPATCHMESSAGE,ss::ax
messageloop:
lea ax,s2
invoke GETMESSAGE, ss::ax, null, null, null
or ax,ax
jne mainloop
;GetMessage() returns FALSE (AX=0) if a "quit" message...
;so here we are quiting....
mov ax,s2.WPARAM ;return wparam to windows OS.
quitwinmain:
ret
WINMAIN ENDP
@hwnd TEXTEQU
msgtype TEXTEQU
wparam TEXTEQU
lparam TEXTEQU
dummy TEXTEQU
@hdc TEXTEQU
s3 TEXTEQU <[bp-(12+SIZE PAINTSTRUCT)]>
;WINHULLOPROC PROC FAR PASCAL, @hWnd:HWND,msgtype:WORD,wParam:WORD, \
; lParam:DWORD
; LOCAL dummy [5]:WORD ;4 or less here can cause a crash.
; LOCAL @hDC:HDC
; LOCAL s3:PAINTSTRUCT
PUBLIC WINHULLOPROC
WINHULLOPROC PROC FAR
push ds ;prolog code
pop ax
nop
inc bp
push bp
mov bp,sp
push ds
mov ds,ax
; sub sp,100 ;leave sufficient space for local data.
;no, you can do it more precisely...
lea sp,s3 ;move stack to beyond local data.
mov ax,msgtype ;get message-type.
cmp ax,WM_CREATE ;message received after CreateWindow()
je xcreate ;function is called.
cmp ax,WM_DESTROY ;message received if a window is closed.
je xquitmessage
cmp ax,WM_PAINT ;message received if Windows has (already)
;redrawn any part of the window (due to
;a size-change for example).
je xpaint
cmp ax,WM_COMMAND ;any selection of the menu will produce
jne notwmcommand
jmp xmenu ;this message.
notwmcommand:
cmp ax,WM_LBUTTONDOWN ;one of many mouse messages.
jne notwmlbutton
jmp xbreak
notwmlbutton:
cmp ax,WM_CHAR ;message that a key pressed.
je xchar
defhandler:
;Default handling of messages....
invoke DEFWINDOWPROC,@hWnd,msgtype,wParam, lParam
jmp xreturn
xcreate:
invoke GETSTOCKOBJECT,OEM_FIXED_FONT
mov hOemFont,ax ;handle to font.
jmp xbreak
xquitmessage:
invoke POSTQUITMESSAGE,0
jmp xbreak
xchar:
jmp xbreak
xpaint:
lea ax,s3 ;ss:ax -- far-addr of paint-structure.
invoke BEGINPAINT,@hWnd,ss::ax
mov @hDC,ax ;hDC -- display-context, required
;before can output to screen.
;For this simple demo, any redraw of the Window will cause output of our
;"hullo world" string....
invoke SELECTOBJECT,ax,hOemFont
invoke TEXTOUT,@hDC,10,20, ADDR soutstring,11
lea ax,s3 ; -- far-addr of paint-structure.
invoke ENDPAINT,@hWnd,ss::ax
jmp SHORT xbreak
xmenu:
cmp WORD PTR lParam,0 ;low-half of lParam
jne xbreak ;test if a menu-message.
cmp wParam,IDM_QUIT ;wParam.
jne notquit
jmp xquitmessage
notquit:
cmp wParam,IDM_ABOUT
jne xbreak ;no other menu items.
;let's put up a message about this program...
invoke MESSAGEBOX, @hWnd, ADDR szaboutstr, ADDR sztitlestr, MB_OK
xbreak:
sub ax,ax ;returns 0 in DX:AX. (callback functions
cwd ;return a 32-bit (long) value).
xreturn:
dec bp ;Windows epilog
dec bp
mov sp,bp
pop ds
pop bp
dec bp
ret 10
WINHULLOPROC ENDP
END
The following is the disassembled listing of the .cpp file listed above. It is, as you will notice, quite huge: ten times as long as the .asm file given above. Once again, it contains the essential components of any Windows 95 application:
The "full version" includes all of the (somewhat lengthy) code added by the Win32 compiler, including Entrance and Exit routines.
:00401000 83EC44 sub esp, 00000044 :00401003 C744241C03000000 mov [esp+1C], 00000003 :0040100B C744242010114000 mov [esp+20], 00401110 :00401013 53 push ebx :00401014 56 push esi :00401015 57 push edi :00401016 33F6 xor esi, esi :00401018 8B7C2454 mov edi, dword ptr [esp+54] :0040101C 68007F0000 push 00007F00 :00401021 89742434 mov dword ptr [esp+34], esi :00401025 56 push esi :00401026 8974243C mov dword ptr [esp+3C], esi :0040102A 897C2440 mov dword ptr [esp+40], edi * Reference To: USER32.LoadIconA, Ord:016Ah :0040102E FF1590614000 Call dword ptr [00406190] :00401034 8944243C mov dword ptr [esp+3C], eax :00401038 68007F0000 push 00007F00 :0040103D 56 push esi * Reference To: USER32.LoadCursorA, Ord:0166h :0040103E FF1588614000 Call dword ptr [00406188] :00401044 89442440 mov dword ptr [esp+40], eax :00401048 56 push esi * Reference To: GDI32.GetStockObject, Ord:00DCh :401049 FF1514614000 Call dword ptr [00406114] * Possible StringData Ref from Data Obj ->"Hello3Menu" :0040104F C744244810504000 mov [esp+48], 00405010 * Possible StringData Ref from Data Obj ->"Hello3" :00401057 C744244C08504000 mov [esp+4C], 00405008 :0040105F 89442444 mov dword ptr [esp+44], eax :00401063 8D442428 lea eax, dword ptr [esp+28] :00401067 50 push eax * Reference To: USER32.RegisterClassA, Ord:01AAh :00401068 FF1598614000 Call dword ptr [00406198] :0040106E 56 push esi :0040106F 893D04314000 mov dword ptr [00403104], edi :00401075 57 push edi :00401076 56 push esi :00401077 56 push esi :00401078 6800000080 push 80000000 :0040107D 6800000080 push 80000000 :00401082 6800000080 push 80000000 :00401087 6800000080 push 80000000 :0040108C 680000CF00 push 00CF0000 * Possible StringData Ref from Data Obj ->"HELLO3" :00401091 6800504000 push 00405000 * Possible StringData Ref from Data Obj ->"Hello3" :00401096 6808504000 push 00405008 :0040109B 56 push esi * Reference To: USER32.CreateWindowExA, Ord:0052h :0040109C FF159C614000 Call dword ptr [0040619C] :004010A2 8BF8 mov edi, eax :004010A4 8B442460 mov eax, dword ptr [esp+60] :004010A8 50 push eax :004010A9 57 push edi * Reference To: USER32.ShowWindow, Ord:0215h :004010AA FF1594614000 Call dword ptr [00406194] :004010B0 57 push edi * Reference To: USER32.UpdateWindow, Ord:0236h :004010B1 FF15A4614000 Call dword ptr [004061A4] :004010B7 8D44240C lea eax, dword ptr [esp+0C] :004010BB 56 push esi :004010BC 56 push esi :004010BD 56 push esi :004010BE 50 push eax * Reference To: USER32.GetMessageA, Ord:010Dh :004010BF 8B35A8614000 mov esi, dword ptr [004061A8] :004010C5 FFD6 call esi :004010C7 85C0 test eax, eax :004010C9 742B je 004010F6 * Reference To: USER32.TranslateMessage, Ord:022Bh :004010CB 8B3DA0614000 mov edi, dword ptr [004061A0] * Reference To: USER32.DispatchMessageA, Ord:008Ch :004010D1 8B1DAC614000 mov ebx, dword ptr [004061AC] * Referenced by: |:004010F4(C) | :004010D7 8D44240C lea eax, dword ptr [esp+0C] :004010DB 50 push eax :004010DC FFD7 call edi :004010DE 8D44240C lea eax, dword ptr [esp+0C] :004010E2 50 push eax :004010E3 FFD3 call ebx :004010E5 8D44240C lea eax, dword ptr [esp+0C] :004010E9 6A00 push 00000000 :004010EB 6A00 push 00000000 :004010ED 6A00 push 00000000 :004010EF 50 push eax :004010F0 FFD6 call esi :004010F2 85C0 test eax, eax :004010F4 75E1 jne 004010D7 * Referenced by: |:004010C9(C) | :004010F6 8B442414 mov eax, dword ptr [esp+14] :004010FA 5F pop edi :004010FB 5E pop esi :004010FC 5B pop ebx :004010FD 83C444 add esp, 00000044 :00401100 C21000 ret 0010 :00401103 CC int 03 :00401104 CC int 03 :00401105 CC int 03 :00401106 CC int 03 :00401107 CC int 03 :00401108 CC int 03 :00401109 CC int 03 :0040110A CC int 03 :0040110B CC int 03 :0040110C CC int 03 :0040110D CC int 03 :0040110E CC int 03 :0040110F CC int 03 :00401110 8B4C2408 mov ecx, dword ptr [esp+08] :00401114 81ECF4000000 sub esp, 000000F4 :0040111A 83F902 cmp ecx, 00000002 :0040111D 56 push esi :0040111E 57 push edi :0040111F 743B je 0040115C :00401121 83F90F cmp ecx, 0000000F :00401124 744B je 00401171 :00401126 81F911010000 cmp ecx, 00000111 :0040112C 0F848E000000 je 004011C0 :00401132 8B84240C010000 mov eax, dword ptr [esp+0000010C] :00401139 8B942408010000 mov edx, dword ptr [esp+00000108] :00401140 8BB42400010000 mov esi, dword ptr [esp+00000100] :00401147 50 push eax :00401148 52 push edx :00401149 51 push ecx :0040114A 56 push esi * Reference To: USER32.DefWindowProcA, Ord:007Dh :0040114B FF156C614000 Call dword ptr [0040616C] :00401151 5F pop edi :00401152 5E pop esi :00401153 81C4F4000000 add esp, 000000F4 :00401159 C21000 ret 0010 :0040115C 6A00 push 00000000 * Reference To: USER32.PostQuitMessage, Ord:01A4h :0040115E FF1564614000 Call dword ptr [00406164] :00401164 33C0 xor eax, eax :00401166 5F pop edi :00401167 5E pop esi :00401168 81C4F4000000 add esp, 000000F4 :0040116E C21000 ret 0010 :00401171 8D44242C lea eax, dword ptr [esp+2C] :00401175 8BB42400010000 mov esi, dword ptr [esp+00000100] :0040117C 50 push eax :0040117D 56 push esi * Reference To: USER32.BeginPaint, Ord:0009h :0040117E FF1574614000 Call dword ptr [00406174] :00401184 8BF8 mov edi, eax :00401186 8D442408 lea eax, dword ptr [esp+08] :0040118A 50 push eax :0040118B 56 push esi * Reference To: USER32.GetClientRect, Ord:00DBh :0040118C FF1578614000 Call dword ptr [00406178] :00401192 8D4C2408 lea ecx, dword ptr [esp+08] :00401196 6A25 push 00000025 :00401198 51 push ecx :00401199 6AFF push FFFFFFFF * Possible StringData Ref from Data Obj ->"Hello, World!" :0040119B 681C504000 push 0040501C :004011A0 57 push edi * Reference To: USER32.DrawTextA, Ord:00A3h :004011A1 FF1570614000 Call dword ptr [00406170] :004011A7 8D4C242C lea ecx, dword ptr [esp+2C] :004011AB 51 push ecx :004011AC 56 push esi * Reference To: USER32.EndPaint, Ord:00AFh :004011AD FF1580614000 Call dword ptr [00406180] :004011B3 33C0 xor eax, eax :004011B5 5F pop edi :004011B6 5E pop esi :004011B7 81C4F4000000 add esp, 000000F4 :004011BD C21000 ret 0010 :004011C0 8B842408010000 mov eax, dword ptr [esp+00000108] :004011C7 25FFFF0000 and eax, 0000FFFF :004011CC 48 dec eax :004011CD 83F813 cmp eax, 00000013 :004011D0 7718 ja 004011EA :004011D2 33C9 xor ecx, ecx :004011D4 8A88A0134000 mov cl, byte ptr [eax+004013A0] :004011DA FF248D78134000 jmp dword ptr [4*ecx+00401378] :004011E1 A16C504000 mov eax, dword ptr [0040506C] :004011E6 89442418 mov dword ptr [esp+18], eax :004011EA 8D442418 lea eax, dword ptr [esp+18] :004011EE 6A40 push 00000040 :004011F0 8BB42404010000 mov esi, dword ptr [esp+00000104] :004011F7 50 push eax * Possible StringData Ref from Data Obj ->"Not Implemented" :004011F8 682C504000 push 0040502C :004011FD 56 push esi * Reference To: USER32.MessageBoxA, Ord:0186h :004011FE FF1584614000 Call dword ptr [00406184] :00401204 33C0 xor eax, eax :00401206 5F pop edi :00401207 5E pop esi :00401208 81C4F4000000 add esp, 000000F4 :0040120E C21000 ret 0010 :00401211 8DBC24B0000000 lea edi, dword ptr [esp+000000B0] :00401218 33C0 xor eax, eax :0040121A B913000000 mov ecx, 00000013 :0040121F F3 repz :00401220 AB stosd :00401221 8BB42400010000 mov esi, dword ptr [esp+00000100] :00401228 8D8424B0000000 lea eax, dword ptr [esp+000000B0] :0040122F 89B424B4000000 mov dword ptr [esp+000000B4], esi :00401236 50 push eax :00401237 C78424B40000004C000000 mov dword ptr [esp+000000B4], 0000004C * Possible StringData Ref from Data Obj ->"All Files" :00401242 C78424C00000005C504000 mov dword ptr [esp+000000C0], 0040505C * Reference To: comdlg32.GetOpenFileNameA, Ord:0012h :0040124D E8C2010000 Call 00401414 :00401252 33C0 xor eax, eax :00401254 5F pop edi :00401255 5E pop esi :00401256 81C4F4000000 add esp, 000000F4 :0040125C C21000 ret 0010 :0040125F 8B1554504000 mov edx, dword ptr [00405054] * Possible StringData Ref from Data Obj ->"Save" :00401265 B854504000 mov eax, 00405054 :0040126A 8D4C2418 lea ecx, dword ptr [esp+18] :0040126E 8A4004 mov al, byte ptr [eax+04] :00401271 8911 mov dword ptr [ecx], edx :00401273 884104 mov byte ptr [ecx+04], al :00401276 E96FFFFFFF jmp 004011EA :0040127B 8DBC24B0000000 lea edi, dword ptr [esp+000000B0] :00401282 33C0 xor eax, eax :00401284 B913000000 mov ecx, 00000013 :00401289 F3 repz :0040128A AB stosd :0040128B 8BB42400010000 mov esi, dword ptr [esp+00000100] :00401292 8D8424B0000000 lea eax, dword ptr [esp+000000B0] :00401299 89B424B4000000 mov dword ptr [esp+000000B4], esi :004012A0 50 push eax :004012A1 C78424B40000004C000000 mov dword ptr [esp+000000B4], 0000004C * Possible StringData Ref from Data Obj ->"All Files" :004012AC C78424C00000005C504000 mov dword ptr [esp+000000C0], 0040505C * Reference To: comdlg32.GetSaveFileNameA, Ord:0014h :004012B7 E852010000 Call 0040140E :004012BC 33C0 xor eax, eax :004012BE 5F pop edi :004012BF 5E pop esi :004012C0 81C4F4000000 add esp, 000000F4 :004012C6 C21000 ret 0010 :004012C9 8D7C246C lea edi, dword ptr [esp+6C] :004012CD 33C0 xor eax, eax :004012CF B910000000 mov ecx, 00000010 :004012D4 F3 repz :004012D5 AB stosd :004012D6 66AB stosw :004012D8 8BB42400010000 mov esi, dword ptr [esp+00000100] :004012DF 8D44246C lea eax, dword ptr [esp+6C] :004012E3 89742470 mov dword ptr [esp+70], esi :004012E7 50 push eax :004012E8 C744247042000000 mov [esp+70], 00000042 * Reference To: comdlg32.PrintDlgA, Ord:0017h :004012F0 E813010000 Call 00401408 :004012F5 33C0 xor eax, eax :004012F7 5F pop edi :004012F8 5E pop esi :004012F9 81C4F4000000 add esp, 000000F4 :004012FF C21000 ret 0010 :00401302 8BB42400010000 mov esi, dword ptr [esp+00000100] :00401309 6A00 push 00000000 :0040130B 6A00 push 00000000 :0040130D 6A10 push 00000010 :0040130F 56 push esi * Reference To: USER32.SendMessageA, Ord:01C5h :00401310 FF157C614000 Call dword ptr [0040617C] :00401316 33C0 xor eax, eax :00401318 5F pop edi :00401319 5E pop esi :0040131A 81C4F4000000 add esp, 000000F4 :00401320 C21000 ret 0010 :00401323 A150504000 mov eax, dword ptr [00405050] :00401328 E9B9FEFFFF jmp 004011E6 :0040132D 8B1548504000 mov edx, dword ptr [00405048] * Possible StringData Ref from Data Obj ->"Copy" :00401333 B848504000 mov eax, 00405048 :00401338 8D4C2418 lea ecx, dword ptr [esp+18] :0040133C 8A4004 mov al, byte ptr [eax+04] :0040133F 8911 mov dword ptr [ecx], edx :00401341 884104 mov byte ptr [ecx+04], al :00401344 E9A1FEFFFF jmp 004011EA :00401349 8BB42400010000 mov esi, dword ptr [esp+00000100] :00401350 6A00 push 00000000 :00401352 68C0134000 push 004013C0 :00401357 A104314000 mov eax, dword ptr [00403104] :0040135C 56 push esi * Possible Reference to Dialog: ABOUTBOX :0040135D 683C504000 push 0040503C :00401362 50 push eax * Reference To: USER32.DialogBoxParamA, Ord:008Ah :00401363 FF158C614000 Call dword ptr [0040618C] :00401369 33C0 xor eax, eax :0040136B 5F pop edi :0040136C 5E pop esi :0040136D 81C4F4000000 add esp, 000000F4 :00401373 C21000 ret 0010 :00401376 8BFF mov edi, edi :00401378 E1114000 DWORD 004011E1 :0040137C 11124000 DWORD 00401211 :00401380 5F124000 DWORD 0040125F :00401384 7B124000 DWORD 0040127B :00401388 C9124000 DWORD 004012C9 :0040138C 02134000 DWORD 00401302 :00401390 23134000 DWORD 00401323 :00401394 2D134000 DWORD 0040132D * Referenced by: |:00401384(C) | :00401398 49134000 DWORD 00401349 :0040139C EA114000 DWORD 004011EA :004013A0 0001 add byte ptr [ecx], al :004013A2 0203 add al, byte ptr [ebx] :004013A4 0405 add al, 05 :004013A6 0909 or dword ptr [ecx], ecx :004013A8 0906 or dword ptr [esi], eax :004013AA 07 pop es :004013AB 0909 or dword ptr [ecx], ecx :004013AD 0909 or dword ptr [ecx], ecx :004013AF 0909 or dword ptr [ecx], ecx :004013B1 0909 or dword ptr [ecx], ecx :004013B3 08CC or ah, cl :004013B5 CC int 03 :004013B6 CC int 03 :004013B7 CC int 03 :004013B8 CC int 03 :004013B9 CC int 03 :004013BA CC int 03 :004013BB CC int 03 :004013BC CC int 03 :004013BD CC int 03 :004013BE CC int 03 :004013BF CC int 03 :004013C0 8B442408 mov eax, dword ptr [esp+08] :004013C4 3D10010000 cmp eax, 00000110 :004013C9 740C je 004013D7 :004013CB 3D11010000 cmp eax, 00000111 :004013D0 740D je 004013DF :004013D2 33C0 xor eax, eax :004013D4 C21000 ret 0010 * Possible Ref to Menu: HELLO3MENU, Item: "New" :004013D7 B801000000 mov eax, 00000001 :004013DC C21000 ret 0010 :004013DF 8B44240C mov eax, dword ptr [esp+0C] :004013E3 25FFFF0000 and eax, 0000FFFF :004013E8 83F801 cmp eax, 00000001 :004013EB 7CE5 jl 004013D2 :004013ED 83F802 cmp eax, 00000002 :004013F0 7FE0 jg 004013D2 :004013F2 8B442404 mov eax, dword ptr [esp+04] * Possible Ref to Menu: HELLO3MENU, Item: "New" :004013F6 6A01 push 00000001 :004013F8 50 push eax * Reference To: USER32.EndDialog, Ord:00ADh :004013F9 FF1568614000 Call dword ptr [00406168] * Possible Ref to Menu: HELLO3MENU, Item: "New" :004013FF B801000000 mov eax, 00000001 :00401404 C21000 ret 0010 :00401407 CC int 03 * Reference To: comdlg32.PrintDlgA, Ord:0017h :00401408 FF25BC614000 Jmp dword ptr [004061BC] * Reference To: comdlg32.GetSaveFileNameA, Ord:0014h :0040140E FF25B8614000 Jmp dword ptr [004061B8] * Reference To: comdlg32.GetOpenFileNameA, Ord:0012h :00401414 FF25B4614000 Jmp dword ptr [004061B4] //******************** Program Entry Point ******** :0040141A 64A100000000 mov eax, dword ptr fs:[00000000] :00401420 55 push ebp :00401421 8BEC mov ebp, esp :00401423 6AFF push FFFFFFFF :00401425 6800404000 push 00404000 :0040142A 682C204000 push 0040202C :0040142F 50 push eax :00401430 64892500000000 mov dword ptr fs:[00000000], esp :00401437 83EC60 sub esp, 00000060 :0040143A 53 push ebx :0040143B 56 push esi :0040143C 57 push edi :0040143D 8965E8 mov dword ptr [ebp-18], esp * Reference To: KERNEL32.GetVersion, Ord:0132h :00401440 FF154C614000 Call dword ptr [0040614C] :00401446 A398504000 mov dword ptr [00405098], eax :0040144B 8AC4 mov al, ah :0040144D 25FF000000 and eax, 000000FF :00401452 A3A4504000 mov dword ptr [004050A4], eax :00401457 A198504000 mov eax, dword ptr [00405098] :0040145C C12D9850400010 shr dword ptr [00405098], 10 :00401463 25FF000000 and eax, 000000FF :00401468 A3A0504000 mov dword ptr [004050A0], eax :0040146D C1E008 shl eax, 08 :00401470 0305A4504000 add eax, dword ptr [004050A4] :00401476 A39C504000 mov dword ptr [0040509C], eax :0040147B E8010B0000 call 00401F81 :00401480 C745FC00000000 mov [ebp-04], 00000000 :00401487 E8070A0000 call 00401E93 :0040148C E8F7090000 call 00401E88 * Reference To: KERNEL32.GetCommandLineA, Ord:00A1h :00401491 FF1544614000 Call dword ptr [00406144] :00401497 A31C344000 mov dword ptr [0040341C], eax :0040149C E85B050000 call 004019FC * Reference To: KERNEL32.GetEnvironmentStrings, Ord:00D2h :004014A1 FF1548614000 Call dword ptr [00406148] :004014A7 A370504000 mov dword ptr [00405070], eax :004014AC E880040000 call 00401931 :004014B1 E8FC000000 call 004015B2 :004014B6 8B351C344000 mov esi, dword ptr [0040341C] :004014BC 8A06 mov al, byte ptr [esi] :004014BE 3C22 cmp al, 22 :004014C0 740C je 004014CE :004014C2 3C20 cmp al, 20 :004014C4 7634 jbe 004014FA :004014C6 46 inc esi :004014C7 803E20 cmp byte ptr [esi], 20 :004014CA 77FA ja 004014C6 :004014CC EB2C jmp 004014FA :004014CE 46 inc esi :004014CF 803E22 cmp byte ptr [esi], 22 :004014D2 7425 je 004014F9 :004014D4 8A5DD8 mov bl, byte ptr [ebp-28] :004014D7 8A1E mov bl, byte ptr [esi] :004014D9 84DB test bl, bl :004014DB 7417 je 004014F4 :004014DD 0FB6C3 movzx eax, bl :004014E0 50 push eax :004014E1 E808040000 call 004018EE :004014E6 83C404 add esp, 00000004 :004014E9 85C0 test eax, eax :004014EB 7401 je 004014EE :004014ED 46 inc esi :004014EE 46 inc esi :004014EF 803E22 cmp byte ptr [esi], 22 :004014F2 75E3 jne 004014D7 :004014F4 803E22 cmp byte ptr [esi], 22 :004014F7 7501 jne 004014FA :004014F9 46 inc esi :004014FA 803E00 cmp byte ptr [esi], 00 :004014FD 740B je 0040150A :004014FF 803E20 cmp byte ptr [esi], 20 :00401502 7706 ja 0040150A :00401504 46 inc esi :00401505 803E00 cmp byte ptr [esi], 00 :00401508 75F5 jne 004014FF :0040150A C745BC00000000 mov [ebp-44], 00000000 :00401511 8D4590 lea eax, dword ptr [ebp-70] :00401514 50 push eax * Reference To: KERNEL32.GetStartupInfoA, Ord:0111h :00401515 FF155C614000 Call dword ptr [0040615C] :0040151B F645BC01 test [ebp-44], 01 * Possible Ref to Menu: HELLO3MENU, Item: "Cut" :0040151F B80A000000 mov eax, 0000000A :00401524 7404 je 0040152A :00401526 0FB745C0 movzx eax, word ptr [ebp-40] :0040152A 50 push eax :0040152B 56 push esi :0040152C 6A00 push 00000000 :0040152E 6A00 push 00000000 * Reference To: KERNEL32.GetModuleHandleA, Ord:00EDh :00401530 FF1550614000 Call dword ptr [00406150] :00401536 50 push eax :00401537 E8C4FAFFFF call 00401000 :0040153C 50 push eax :0040153D E8A0000000 call 004015E2 :00401542 EB22 jmp 00401566 :00401544 8B45EC mov eax, dword ptr [ebp-14] :00401547 8B00 mov eax, dword ptr [eax] :00401549 8B00 mov eax, dword ptr [eax] :0040154B 8945E0 mov dword ptr [ebp-20], eax :0040154E FF75EC push [ebp-14] :00401551 50 push eax :00401552 E80C020000 call 00401763 :00401557 83C408 add esp, 00000008 :0040155A C3 ret :0040155B 8B65E8 mov esp, dword ptr [ebp-18] :0040155E FF75E0 push [ebp-20] :00401561 E88D000000 call 004015F3 :00401566 83C404 add esp, 00000004 :00401569 C745FCFFFFFFFF mov [ebp-04], FFFFFFFF :00401570 8B45F0 mov eax, dword ptr [ebp-10] :00401573 5F pop edi :00401574 64A300000000 mov dword ptr fs:[00000000], eax :0040157A 5E pop esi :0040157B 5B pop ebx :0040157C 8BE5 mov esp, ebp :0040157E 5D pop ebp :0040157F C3 ret :00401580 FF742404 push [esp+04] :00401584 E86C0B0000 call 004020F5 :00401589 83C404 add esp, 00000004 :0040158C 85C0 test eax, eax :0040158E 7413 je 004015A3 :00401590 6800000100 push 00010000 * Possible StringData Ref from Data Obj ->"runtime error" :00401595 687C504000 push 0040507C :0040159A 50 push eax :0040159B 6A00 push 00000000 * Reference To: USER32.MessageBoxA, Ord:0186h :0040159D FF1584614000 Call dword ptr [00406184] :004015A3 68FF000000 push 000000FF :004015A8 FF1578504000 call dword ptr [00405078] :004015AE 83C404 add esp, 00000004 :004015B1 C3 ret :004015B2 A114344000 mov eax, dword ptr [00403414] :004015B7 85C0 test eax, eax :004015B9 7402 je 004015BD :004015BB FFD0 call eax :004015BD 68C0594000 push 004059C0 :004015C2 68BC594000 push 004059BC :004015C7 E8B7000000 call 00401683 :004015CC 83C408 add esp, 00000008 :004015CF 68B8594000 push 004059B8 :004015D4 68B4594000 push 004059B4 :004015D9 E8A5000000 call 00401683 :004015DE 83C408 add esp, 00000008 :004015E1 C3 ret :004015E2 6A00 push 00000000 :004015E4 6A00 push 00000000 :004015E6 FF74240C push [esp+0C] :004015EA E815000000 call 00401604 :004015EF 83C40C add esp, 0000000C :004015F2 C3 ret :004015F3 6A00 push 00000000 * Possible Ref to Menu: HELLO3MENU, Item: "New" :004015F5 6A01 push 00000001 :004015F7 FF74240C push [esp+0C] :004015FB E804000000 call 00401604 :00401600 83C40C add esp, 0000000C :00401603 C3 ret :00401604 C705D050400001000000 mov dword ptr [004050D0], 00000001 :0040160E 837C240800 cmp dword ptr [esp+08], 00000000 :00401613 53 push ebx :00401614 56 push esi :00401615 8B5C2414 mov ebx, dword ptr [esp+14] :00401619 881DCC504000 mov byte ptr [004050CC], bl :0040161F 753F jne 00401660 :00401621 833D1834400000 cmp dword ptr [00403418], 00000000 :00401628 7424 je 0040164E :0040162A 8B3510344000 mov esi, dword ptr [00403410] :00401630 83EE04 sub esi, 00000004 :00401633 393518344000 cmp dword ptr [00403418], esi :00401639 7713 ja 0040164E :0040163B 8B06 mov eax, dword ptr [esi] :0040163D 85C0 test eax, eax :0040163F 7402 je 00401643 :00401641 FFD0 call eax :00401643 83EE04 sub esi, 00000004 :00401646 393518344000 cmp dword ptr [00403418], esi :0040164C 76ED jbe 0040163B :0040164E 68C8594000 push 004059C8 :00401653 68C4594000 push 004059C4 :00401658 E826000000 call 00401683 :0040165D 83C408 add esp, 00000008 :00401660 68D0594000 push 004059D0 :00401665 68CC594000 push 004059CC :0040166A E814000000 call 00401683 :0040166F 83C408 add esp, 00000008 :00401672 85DB test ebx, ebx :00401674 750A jne 00401680 :00401676 FF74240C push [esp+0C] * Reference To: KERNEL32.ExitProcess, Ord:0064h :0040167A FF153C614000 Call dword ptr [0040613C] :00401680 5E pop esi :00401681 5B pop ebx :00401682 C3 ret :00401683 56 push esi :00401684 57 push edi :00401685 8B7C2410 mov edi, dword ptr [esp+10] :00401689 8B74240C mov esi, dword ptr [esp+0C] :0040168D 3BFE cmp edi, esi :0040168F 760F jbe 004016A0 :00401691 8B06 mov eax, dword ptr [esi] :00401693 85C0 test eax, eax :00401695 7402 je 00401699 :00401697 FFD0 call eax :00401699 83C604 add esi, 00000004 :0040169C 3BFE cmp edi, esi :0040169E 77F1 ja 00401691 :004016A0 5F pop edi :004016A1 5E pop esi :004016A2 C3 ret :004016A3 CC int 03 :004016A4 55 push ebp :004016A5 8BEC mov ebp, esp :004016A7 53 push ebx :004016A8 56 push esi :004016A9 57 push edi :004016AA 55 push ebp :004016AB 6A00 push 00000000 :004016AD 6A00 push 00000000 * Possible StringData Ref from Code Obj ->"]_^[" :004016AF 68BC164000 push 004016BC :004016B4 FF7508 push [ebp+08] * Reference To: KERNEL32.RtlUnwind, Ord:01BBh :004016B7 E872110000 Call 0040282E :004016BC 5D pop ebp :004016BD 5F pop edi :004016BE 5E pop esi :004016BF 5B pop ebx :004016C0 8BE5 mov esp, ebp :004016C2 5D pop ebp :004016C3 C3 ret :004016C4 8B4C2404 mov ecx, dword ptr [esp+04] * Possible Ref to Menu: HELLO3MENU, Item: "Exit" :004016C8 F7410406000000 test [ecx+04], 00000006 * Possible Ref to Menu: HELLO3MENU, Item: "New" :004016CF B801000000 mov eax, 00000001 :004016D4 740F je 004016E5 :004016D6 8B442408 mov eax, dword ptr [esp+08] :004016DA 8B542410 mov edx, dword ptr [esp+10] :004016DE 8902 mov dword ptr [edx], eax * Possible Ref to Menu: HELLO3MENU, Item: "Save" :004016E0 B803000000 mov eax, 00000003 :004016E5 C3 ret :004016E6 53 push ebx :004016E7 56 push esi :004016E8 57 push edi :004016E9 8B442410 mov eax, dword ptr [esp+10] :004016ED 50 push eax :004016EE 6AFE push FFFFFFFE :004016F0 68C4164000 push 004016C4 :004016F5 64FF3500000000 push dword ptr fs:[00000000] :004016FC 64892500000000 mov dword ptr fs:[00000000], esp :00401703 8B442420 mov eax, dword ptr [esp+20] :00401707 8B5808 mov ebx, dword ptr [eax+08] :0040170A 8B700C mov esi, dword ptr [eax+0C] :0040170D 83FEFF cmp esi, FFFFFFFF :00401710 7420 je 00401732 :00401712 3B742424 cmp esi, dword ptr [esp+24] :00401716 741A je 00401732 :00401718 8D3476 lea esi, dword ptr [esi+2*esi] :0040171B 8B0CB3 mov ecx, dword ptr [ebx+4*esi] :0040171E 894C2408 mov dword ptr [esp+08], ecx :00401722 89480C mov dword ptr [eax+0C], ecx :00401725 837CB30400 cmp dword ptr [ebx+4*esi+04], 00000000 :0040172A 7504 jne 00401730 :0040172C FF54B308 call [ebx+4*esi+08] :00401730 EBD1 jmp 00401703 :00401732 648F0500000000 pop dword ptr fs:[00000000] :00401739 83C40C add esp, 0000000C :0040173C 5F pop edi :0040173D 5E pop esi :0040173E 5B pop ebx :0040173F C3 ret :00401740 33C0 xor eax, eax :00401742 648B0D00000000 mov ecx, dword ptr fs:[00000000] :00401749 817904C4164000 cmp dword ptr [ecx+04], 004016C4 :00401750 7510 jne 00401762 :00401752 8B510C mov edx, dword ptr [ecx+0C] :00401755 8B520C mov edx, dword ptr [edx+0C] :00401758 395108 cmp dword ptr [ecx+08], edx :0040175B 7505 jne 00401762 * Possible Ref to Menu: HELLO3MENU, Item: "New" :0040175D B801000000 mov eax, 00000001 :00401762 C3 ret :00401763 56 push esi :00401764 57 push edi :00401765 FF74240C push [esp+0C] :00401769 E853010000 call 004018C1 :0040176E 83C404 add esp, 00000004 :00401771 85C0 test eax, eax :00401773 0F843B010000 je 004018B4 :00401779 8B5008 mov edx, dword ptr [eax+08] :0040177C 85D2 test edx, edx :0040177E 0F8430010000 je 004018B4 :00401784 83FA05 cmp edx, 00000005 :00401787 7511 jne 0040179A :00401789 C7400800000000 mov [eax+08], 00000000 * Possible Ref to Menu: HELLO3MENU, Item: "New" :00401790 B801000000 mov eax, 00000001 :00401795 E924010000 jmp 004018BE :0040179A 83FA01 cmp edx, 00000001 :0040179D 750A jne 004017A9 :0040179F B8FFFFFFFF mov eax, FFFFFFFF :004017A4 E915010000 jmp 004018BE :004017A9 8B3560514000 mov esi, dword ptr [00405160] :004017AF 8B4C2410 mov ecx, dword ptr [esp+10] :004017B3 890D60514000 mov dword ptr [00405160], ecx :004017B9 83780408 cmp dword ptr [eax+04], 00000008 :004017BD 0F85D5000000 jne 00401898 :004017C3 8B0D54514000 mov ecx, dword ptr [00405154] :004017C9 030D50514000 add ecx, dword ptr [00405150] :004017CF 3B0D50514000 cmp ecx, dword ptr [00405150] :004017D5 7E21 jle 004017F8 * Possible Ref to Menu: HELLO3MENU, Item: "Save" :004017D7 8B0D50514000 mov ecx, dword ptr [00405150] :004017DD 6BC90C imul ecx, 0000000C :004017E0 8DB9E0504000 lea edi, dword ptr [ecx+004050E0] :004017E6 8B0D54514000 mov ecx, dword ptr [00405154] :004017EC C70700000000 mov dword ptr [edi], 00000000 :004017F2 83C70C add edi, 0000000C :004017F5 49 dec ecx :004017F6 75F4 jne 004017EC :004017F8 8B3D5C514000 mov edi, dword ptr [0040515C] :004017FE 8B00 mov eax, dword ptr [eax] :00401800 3D8E0000C0 cmp eax, C000008E :00401805 750C jne 00401813 :00401807 C7055C51400083000000 mov dword ptr [0040515C], 00000083 :00401811 EB70 jmp 00401883 :00401813 3D900000C0 cmp eax, C0000090 :00401818 750C jne 00401826 :0040181A C7055C51400081000000 mov dword ptr [0040515C], 00000081 :00401824 EB5D jmp 00401883 :00401826 3D910000C0 cmp eax, C0000091 :0040182B 750C jne 00401839 :0040182D C7055C51400084000000 mov dword ptr [0040515C], 00000084 :00401837 EB4A jmp 00401883 :00401839 3D930000C0 cmp eax, C0000093 :0040183E 750C jne 0040184C :00401840 C7055C51400085000000 mov dword ptr [0040515C], 00000085 :0040184A EB37 jmp 00401883 :0040184C 3D8D0000C0 cmp eax, C000008D :00401851 750C jne 0040185F :00401853 C7055C51400082000000 mov dword ptr [0040515C], 00000082 :0040185D EB24 jmp 00401883 :0040185F 3D8F0000C0 cmp eax, C000008F :00401864 750C jne 00401872 :00401866 C7055C51400086000000 mov dword ptr [0040515C], 00000086 :00401870 EB11 jmp 00401883 :00401872 3D920000C0 cmp eax, C0000092 :00401877 750A jne 00401883 :00401879 C7055C5140008A000000 mov dword ptr [0040515C], 0000008A :00401883 A15C514000 mov eax, dword ptr [0040515C] :00401888 50 push eax :00401889 6A08 push 00000008 :0040188B FFD2 call edx :0040188D 83C408 add esp, 00000008 :00401890 893D5C514000 mov dword ptr [0040515C], edi :00401896 EB0F jmp 004018A7 :00401898 C7400800000000 mov [eax+08], 00000000 :0040189F FF7004 push [eax+04] :004018A2 FFD2 call edx :004018A4 83C404 add esp, 00000004 :004018A7 B8FFFFFFFF mov eax, FFFFFFFF :004018AC 893560514000 mov dword ptr [00405160], esi :004018B2 EB0A jmp 004018BE :004018B4 FF742410 push [esp+10] * Reference To: KERNEL32.UnhandledExceptionFilter, Ord:0219h :004018B8 FF1540614000 Call dword ptr [00406140] :004018BE 5F pop edi :004018BF 5E pop esi :004018C0 C3 ret --------110K Output truncated. 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