Used to get quite defined radar returns on the Airbus around Europe, would be a red segment starting at the aircraft and extending to the edge of the radar display fanning out to around 10 degrees at the edge. I always wondered what the was until one day I flew with a captain who was an ex tornado driver. He was 100% sure that when this happened it meant we were being tracked by a ground radar station! he said that when he was stationed in Germany the radar operators regularly trained by locking onto passing airliners! Now I don't know if any of that is true but it seemed reasonable as this always happened over Germany and on multiple different aircraft. Made me wonder whether you might see this sort of return as the SAM raced towards you, not that you could do anything about it.
As an aside, is it true that all EL AL aircraft are equipped with counter measures?