The current assumption here in Israel is that this was a joint operation. Mossad brought the detailed intel (possibly with US assistance) and the army intelligence unit 8200 (http://en.wikipedia.org/wiki/Unit_8200) carried out the execution.
Unit 8200 is not only in charge of SIGINT collection, but also oversees and coordinates the entire cyber-warfare effort in the IDF.
Unit 8200 is not only in charge of SIGINT collection, but also oversees and coordinates the entire cyber-warfare effort in the IDF.