dobin-ShellcodeObfuscationLab/lab_results/random_shellcode/twoarray_work.c

#include <windows.h>
#include <stdio.h>


int main(void)
{
	

	#define PAYLOAD_SIZE 42
char evens[21] = {0xff, 0x74, 0x65, 0x73, 0x74, 0x65, 0x69, 0x6e, 0x73, 0x7a, 0x77, 0x6f, 0x65, 0x69, 0x6e, 0x73, 0x7a, 0x77, 0x6f, 0x32, 0x32};
char odds[21] = {0xfe, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0};


	char shellcode[PAYLOAD_SIZE] = { 0x00 };
	int twoArrIdx = 0;
	int idx = 0;

	while (idx < PAYLOAD_SIZE)
	{
		// read from the even array
		shellcode[idx] = evens[twoArrIdx];
		
		// odds will be one byte less than evens if PAYLOAD_SIZE is odd
		if ( twoArrIdx == (int)sizeof(odds) )
		{
			// do nothing, otherwise we'll read past the end of our array
		}
		else
		{
			// read from odd array
			shellcode[idx+1] = odds[twoArrIdx];
			
			// increment twoArrIdx to move to the next position in the evens and odds arrays
			twoArrIdx++;
		}

		// we've just added two bytes, so we need to shift two positions instead of one
		idx = idx + 2;
	}

	idx = 0;
	while ( idx < PAYLOAD_SIZE)
	{
		if (idx == (PAYLOAD_SIZE - 1))
		{
			printf("0x%02x ", (unsigned char)shellcode[idx]);
		}
		else
		{
			printf("0x%02x, ", (unsigned char)shellcode[idx]);
		}
		idx++;
	}

    return 0;
}