hardcoded-addr-shellcode

HelloWorld in asm - Hardcoded addresses

In this code, we will use hardcoded addresses for MessageBoxA, LoadLibraryA, and ExitProcess, which we will obtain using the resolver.exe tool. The code will display a "Hello World" message box written in assembly.

We will ensure that user32.dll is loaded using LoadLibraryA (since it is available in kernel32.dll), and then call MessageBoxA. Finally, we will call ExitProcess to terminate the program smoothly.

We will also use the following steps to compile and execute the assembly code:

1. Compile the assembly code:

   nasm -f elf32 test1.asm -o test1.o

2. Dump the shellcode:

   ./dump.sh test1.o

3. Include the shellcode in a C program:

   #include <Windows.h>
   
   const char main[] = "shellcode";

4. Compile the C program:

   mingw32-gcc-6.3.0.exe F:\Junk\tester.c -o tester.exe

   Note: The tester.exe is the compiled version of the same code:

   #include <Windows.h>
   
   const char main[] = "shellcode";

Once you do that, for resolving the hardcoded addresses, you can use resolver.exe. I will provide the .c file as well if you want to see the raw code.

You can then visualize what is happening in IDA.