Pretty sure the only reason Netanyahu attributed this to the Da'esh ("ISIS") was to get increased sympathy from gentiles.  I seriously doubt this was actually the case.  Da'esh leader Abu Bakr al-Baghdadi as more than once declared that Israel was not his group's priority, but rather elimination of the Shi'a and other Muslims which don't "conform" to doctrinal and/or practical "interpretations" approved by the Da'esh in order to establish their perverted version of a "Khilafat".  This was just another Palestinian fighting against an occupying foreign army any way he can.