#include "stdafx.h"
#include <windows.h>
#include "CMutate.h"

__declspec(naked) void MutateCore( void )
{
    _asm _emit 0x90; //0
    _asm _emit 0x90; //1
    _asm _emit 0x90; //2
    _asm _emit 0x90; //3
    _asm _emit 0x90; //4
    _asm _emit 0x90; //5
    _asm _emit 0x90; //6
    _asm _emit 0x90; //7
    _asm _emit 0x90; //8
    _asm _emit 0x90; //9
    _asm _emit 0x90; //10
    _asm _emit 0x90; //11
    _asm _emit 0x90; //12
    _asm _emit 0x90; //13
    _asm _emit 0x90; //14
    _asm _emit 0x90; //15
    _asm _emit 0x90; //16
    _asm _emit 0x90; //17
    _asm _emit 0x90; //18
    _asm _emit 0x90; //19
    _asm _emit 0x90; //20
    _asm _emit 0x90; //21
    _asm _emit 0x90; //22
    _asm _emit 0x90; //23
    _asm _emit 0x90; //24
    _asm _emit 0x90; //25
    _asm _emit 0x90; //26
    _asm _emit 0x90; //27
    _asm _emit 0x90; //28
    _asm _emit 0x90; //29
    _asm _emit 0x90; //30
    _asm _emit 0x90; //31
    _asm _emit 0x90; //32
    _asm retn;
}

DWORD WINAPI lpMutate( LPVOID lpParams )
{
    int *iRandomSeed = (int *)lpParams;

    if( iRandomSeed == NULL )
    {
        iRandomSeed        = new int;
        *iRandomSeed    = rand()%9999;
    }
    else
    {
        if( *iRandomSeed == 0 )
        {
            iRandomSeed        = new int;
            *iRandomSeed    = rand()%9999;
        }
    }

    while( true )
    {
        MEMORY_BASIC_INFORMATION mbi;
        VirtualQuery( MutateCore, &mbi, sizeof( mbi ) );
        VirtualProtect( mbi.BaseAddress, mbi.RegionSize, PAGE_EXECUTE_READWRITE, &mbi.Protect );

        BYTE *byteArrayMutateCore = (BYTE *)MutateCore;

        for( int i = 0; i < 32; i++ )
        {
            srand( GetTickCount() * (i + i * i) * (*iRandomSeed));

            byteArrayMutateCore[i] = rand() % 255;
        }

        VirtualProtect( mbi.BaseAddress, mbi.RegionSize, mbi.Protect, NULL );
        FlushInstructionCache( GetCurrentProcess(), MutateCore, 32 );

        Sleep(10);
    }

    return 0;
}

void CMutate::SetRandomSeed( int iRandomSeed )
{
    m_iRandomSeed = iRandomSeed;
}

void CMutate::InitiateMutation()
{
    //this will ensure its referenced as a function
    MutateCore();

    CreateThread( 0, 0, lpMutate, &m_iRandomSeed, 0, 0 );
}