I would like to share a book that might help you on a hacking/pentesting engagement.
It simulates a real hacking scenario from start to finish. From planting a small hardware in a store to spying on board meetings using custom scripts.

No metasploit, or pesky executables that trigger antivirus alerts or startup registry keys that any newbie admin can find...
Only neat opsec & up to date tricks (wmi, golden ticket, reflective dll injection, domain bouncing etc. )

You can get a copy here :

You will mostly find Windows stuff but there is a dedicated section about Mainframe hacking (I find it fascinating that every so called hacking book skips over a technology that is at the heart of all major businesses in the world...)

Hope you enjoy it!

Sparc F.