Given how huge this hack is, and how little the BTC reward is going to be, I'm tempting to think this is either: - a test of a new hacking system - a demonstration to a big client - a first shot to threat some entity - a diversion while they get the real loot And that the BTC messages are just a way to justify it so it looks like a simple scam. Such a hack is worth way, WAY more than the few BTC it could bring.
It could just be a relatively unsophisticated actor who stumbled upon a serious vulnerability and didn't know enough to market it to, eg, a state actor or whatever.
Attack vector: Sim-Swapping. It was too easy. As soon as he got into one account, he got access to it's contacts and more phone numbers.
The attacker (0rbit) was a 20 year old student living at his parents home. He bragged about his hack to a online friend. This friend knew that 0rbit had been raided by the police years earlier. He betrayed him to the investigators and with the exact date of the raid the they were able looked up the old case and reveal his identity.
Previously on HN: https://news.ycombinator.com/item?id=18823286