The audit system should collect detailed file access records for
all users and root. The openat syscall can be used to modify
files if called for write operation with the O_TRUNC_WRITE flag.
The following audit rules will assure that successful attempts to create a
file via openat syscall are collected.
If the auditd daemon is configured to use the augenrules
program to read audit rules during daemon startup (the default), add the
rules below to a file with suffix .rules in the directory
/etc/audit/rules.d.
If the auditd daemon is configured to use the auditctl
utility to read audit rules during daemon startup, add the rules below to
/etc/audit/audit.rules file.
-a always,exit -F arch=b32 -S openat -F a2&01003 -F success=1 -F auid>=1000 -F auid!=unset -F key=successful-modification
If the system is 64 bit then also add the following lines:
-a always,exit -F arch=b64 -S openat -F a2&01003 -F success=1 -F auid>=1000 -F auid!=unset -F key=successful-modification