Running a script when a particular command is run

Actually, what i want is: I have a passwords file (encrypted of course) which is accessible to the root user. I want to prepare for a "break-in", per say, where the root user is compromised. So, if someone, using the root user tries to view that file with vim or cat, i want them to be locked in an infinite loop, so that they have to exit the terminal on their end. I dont want the keyboard interuption to work. But, if i use the whole path of the utility Eg."/usr/bin/cat" Then it should work. Basically... I want to create an alias where "cat " runs a custom script. I require the script as well as how to properly alias it. Thanks

man auditd
man auditd.conf

Is what you're looking for and then you run a command once there's a line being logged:

1. How to log all commands run on Linux including their arguments (parameters)?
2. How to run a script on auditd events?