/usr/share/doc/auditd/examples/rules/21-no32bit.rules is in auditd 1:2.6.7-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | ## If you are on a 64 bit platform, everything _should_ be running
## in 64 bit mode. This rule will detect any use of the 32 bit syscalls
## because this might be a sign of someone exploiting a hole in the 32
## bit API.
-a always,exit -F arch=b32 -S all -F key=32bit-abi
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