I agree, we're looking at Russia/China on that one, possibly the French, who have ties to the Iranian Air Force as well. This was a sophisticated attack for a bunch of normally bumbling disorganized "freedom fighters".
You also have to approach on an angle blindsiding the CIWS mount forward if this is a SAAR5 corvette, which is the only class ship the Israelis have with a complement of around 80 crewmen.
The UK times is reporting that hezbollah has been developing drones for two years. Hezbollah is also reported to have eight Mohajer-4 drones supplied by Iran.