P.O.O. Endgame is one of HackTheBox’s endgame labs and was just retired. It involves exploiting SQL Server Links & Active Directory ACLs.
Sniper is a 30-point machine on HackTheBox that involves abusing a remote file inclusion and uploading a crafted chm file which is opened automatically by the local administrator.
Forest is a 20-point active directory machine on HackTheBox that involves user enumeration, AS-REP-Roasting and abusing Active Directory ACLs to become admin.
Bankrobber is a 50-point machine on hackthebox that involves exploiting a cross site scripting vulnerability to gain access to an admin account, using a command injection to get a user shell and exploiting a simple buffer overflow to become system.
RE is a 40 point windows machine on HackTheBox that involves uploading an ods file with a malicious macro, abusing a winrar vulnerability and using UsoSVC together with metasploit's incognito module to become root.
Heist is an "easy" machine on hackthebox, involving some enumeration (especially rpc) and some forensics (dumping firefox memory).
Bastion is an easy 20 points machine on hackthebox. It is about mounting a .vhd file over the network, retrieving password hashes from backups (via SAM) and a privilege escalation that involves stored credentials in mRemoteNG.
Arkham was a surprisingly hard box for the 30 points that were awarded for it, as I was struggling quite a bit, especially for the user part. However in the end i enjoyed the box a lot because it forced me to use stuff I don't encounter often and...
Helpline is a really fun box on hackthebox.eu, which I was lucky enough to get system first blood on :) Weirdly enough I couldn't get the user first blood - but more to that later.