[glorgau]

I’d put my money on “disgruntled ex-employee”. At the very least, a competent hacker would know how to hide their tracks.

[Salgak]

I’m guessing somebody got social engineered. It’s as good as having an insider, and far easier

[ImJustAnotherOkie]

At the very least, a competent hacker would know how to hide their tracks.

Or deliberately leave a trail pointing to another, or pointing to yet another. Pointer to a pointer. In computer terms trivial stuff.