code:

    GameObject GenerateHitBox(Vector3 position, Vector3 scale)
    {
        var hitBox = GameObject.CreatePrimitive(PrimitiveType.Cube);
        hitBox.transform.position = position;
        hitBox.transform.localScale = scale;

        hitBox.AddComponent<HitBoxCollider>();
        var boxCollider = hitBox.AddComponent<BoxCollider>();

        boxCollider.isTrigger = true;

        if(hitBox.GetComponent<Rigidbody>() != null)
        {
            Debug.Log("Hit box has a rigid body!");
        } 
        else
        {
            Debug.Log("Hit box does not have a rigid body!");
        }

        var allComponents = hitBox.GetComponents(typeof(Component));
        foreach(var component in allComponents)
        {
            Debug.Log(component.GetType().Name);
        }

        Object.Destroy(hitBox, 5.0f);
        return hitBox;            
    }


... The HitBoxCollider

using UnityEngine;
using System.Collections;

public class HitBoxCollider : MonoBehaviour {
    void OnCollisionEnter(Collision col)
    {
        Debug.Log(gameObject.name + " collided with " + col.gameObject.name);
    }

    void OnTriggerEnter(Collider other)
    {
        Debug.Log(gameObject.name + " triggered by " + other.gameObject.name);       
    }
}