MYRA Linux RAT LD_PRELOAD and Cron Persistence via .libcache.so

This rule detects various persistence mechanisms and configuration tampering techniques often associated with compromised development environments. Specifically, it monitors for the creation of LD_PRELOAD libraries in common directories, unauthorized modifications to shell profile scripts, suspicious cron job creation by Node/NPM processes, and the poisoning of configuration files for IDEs and AI coding assistants (e.g., Claude, Cursor, VSCode). It also detects the execution of suspicious Node.js scripts used as session hooks.