Maybe you're thinking of Phrack [1]? I wonder if there'll be another edition of it, and if yes what it would look like, now that the AIpocalypse seems to have reached security research...
[1]: https://phrack.org
Not Phrack but I did find it, ThugCrowd [1]!
[1]: https://thugcrowd.com/archive.html
Edit to add, apparently one of the ThugCrowd people is part of tmp.0ut so that would explain why my mind immediately went there.
Darnet Diaries'episode about the legendary phrack
https://darknetdiaries.com/episode/170/