Is this a "hack"? I read some articles saying they had valid multisig authority to transfer the ETH. Blockchain security working as intended.
Those are not equivalent because the traditional banking sector is less vulnerable to North Korea. In theory a bank could be drained of $1b via a misdirected wire, but in practice that kind of plan is hampered by real-world controls and limitations applicable to international banking.[1] North Korean hackers instead focus on what works, which is crypto.
[1] https://pacforum.org/publications/yl-blog-89-crypto-north-ko...