pam_tty_audit.so to understand who is doing this:
Thanks I’ll keep that in mind.
Just to report back, stopping pre-linking as detailed yesterday and setting immutable with chattr on the Asterisk executable on the Head Office box here appears to have solved the problem. The box did not crash this morning as it did the previous two days and is working fine… strange, but good.
Previous to the problem starting on Tuesday, the box had been running fine for about three years 24/7 – so I might still have some kind of compromise going on.
Anyway thanks for the assistance everyone