Abstract: There may be provided a method for artificial intelligence based detection of cyber attackers, the method may include (a) applying the artificial intelligence process to generate communication signatures for multiple virtual users of one or more networks of interest; (b) comparing the communication signatures for multiple virtual users to each other; (c) finding that communication signatures of a set of virtual users of the multiple virtual users are substantially the same; and (d) determining that the set of virtual users represent to a suspected or an actual cyber attacker.