Increasingly frequent cyberattacks and their use in armed conflicts of the 21st century have opened up a new domain of warfare - cyberspace. Due to the large interconnection of civil and military systems in cyberspace, it is very difficult to carry out cyber attacks in accordance with the main aim and purpose of international humanitarian law - the protection of civilians and civilian objects. Moreover, it is questionable whether the rules, principles and terminology of international humanitarian law, created by taking into account a completely different type of warfare, can be applied to cyber attacks. That is why the first part of this paper will clarify whether international humanitarian law can be applied to cyber operations. Given the specifics of cyber attacks, i.e. the fact that they are not carried out using kinetic force, that they are carried out in a virtual space where a large number of people operate at the same time, and that the infrastructure of that space has both civilian and military purposes, there may be difficulties in the application of traditional rules of international humanitarian law on the conduct of hostilities. For this reason, the emphasis of the second part of the paper will be the application of the rules of international humanitarian law, especially the rules of distinction, proportionality and precautions, to cyberattacks.