This type of analysis quickly starts to wade into “intelligence” in the CIA sense of the word. It’s possible to do some of this digging on your own, but for the most part this type of information ends up requiring a lot of inference and synthesis across different sources and collection mechanisms to build a coherent story.
If there’s one thing I learned from working in this space, it’s how there’s just massive amounts of “history” playing out every day that will never be written down or acknowledged. In particular, cyber/electronic warfare is a very active space, and quite a few nation states regularly commit what many of us would imagine would be considered acts of war against each other, without a word said to the public.
It's not evidence at all, just data (intelligence) that makes me reconsider what I thought I knew about the situation and what else might be related that I didn't consider before.
We have a "special" relationship with Israel so I can't go too much into detail, but suffice to say it was password spraying attacks that originated from domestic residential IPs that dropped off. Normally foreign agencies use datacenters and a known set of VPN ASNs. Israel happens to have their own onion routing network in the form of Hola/Luminati, but that isn't a discrete ASN-- it's a botnet of residential proxies.
I don't know if Luminati is even still a thing but this is the sort of footprint I'd expect from it. They'd find residential proxies useful for their astroturfing campaigns so I assume it's still up. Attribution is a game of educated guesses.
Now, I'm not implying the Israeli government is the actor here. For all I know it's some bored teenager fucking with us. The timing is what's suspect. Either the operator was compelled to stop when war broke out or the infrastructure they were using was somehow impacted by the Gaza offensive.
If there’s one thing I learned from working in this space, it’s how there’s just massive amounts of “history” playing out every day that will never be written down or acknowledged. In particular, cyber/electronic warfare is a very active space, and quite a few nation states regularly commit what many of us would imagine would be considered acts of war against each other, without a word said to the public.