To answer this question it is important to consider whether there are any signs of moral ethics in Nature or other entities which would exist independent of Man. To make the problem easier an analogy can be put forward. It is accepted amongst most scientific communities today that scientific knowledge is present in Nature, and that Man simply infers it from Nature. This seems to portray that there is some sort of heavenly body (God, perhaps) that has created this knowledge and used it to design Nature. Mankind simply reads Nature and in the process, procures scientific knowledge.
The same can be applied to moral knowledge too. After all, Man is no one to create an entire system of rules which will govern the world and call all the shots as to whether something is wrong or right. Many religious knowledge systems too indicate that the one who lights our path and shows us right from wrong is God, and that we are not advanced enough to make the right decisions. God is considered to be the Creator and so, it is only fair to say that He created moral knowledge too. Thus, this view of the issue seems to be pointing at moral knowledge being independent of Man.
However, it is quite certain that there are certain morals that Man alone seems to possess. There simply are not any good examples in Nature to counter this statement. For example, a carnivore will kill any animal in its sight to satisfy its need for food and satiate its hunger. It will not think of whether the species of its prey is endangered and on the verge of extinction. On the other hand, Mankind has formulated certain laws and morals which try to conserve certain species of organisms which are endangered, because we truly understand the consequences of an entire species becoming extinct. In such a situation, Man seems to have created moral knowledge, and these morals seem to be dependent on Mankind, or society, for that matter. Thus, it also seems that there are certain morals which Man has himself created and thus Man is capable of creating knowledge.
There is, however, a possible refutation to the previous knowledge claim, which I am inclined to support. While it is true that society has tweaked certain morals and perhaps created a few too, it has to be understood that Man himself is dependent on another heavenly entity for His creation. In this sense, it can be said that this heavenly entity had created these morals which we today call “our” morals and laws. In the previous example, the only reason why we created such a moral was because we have been gifted with a brain and the intellect to recognize the consequences of extinction of species. These morals must thus have been created by an omnipresent persona while we humans are simply the ones who deliver it to the planet, much like Nature delivers the other morals which were talked about earlier. Thus, it can be safely said that while Man “seems” to have made certain morals, these morals all truly belong to an omnipresent, heavenly persona, leaving us with the conclusion that moral knowledge is indeed omnipresent.