Record Successful Creation Attempts to Files - openat O_CREAT
An XCCDF Rule
Description
Theopenat syscall can be used to create new files
when O_CREAT flag is specified.
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&0100 -F success=1 -F auid>=1000 -F auid!=unset -F key=successful-createIf the system is 64 bit then also add the following lines:
-a always,exit -F arch=b64 -S openat -F a2&0100 -F success=1 -F auid>=1000 -F auid!=unset -F key=successful-create
warning alert: Warning
Note that these rules can be configured in a
number of ways while still achieving the desired effect. Here the system calls
have been placed independent of other system calls. Grouping system calls related
to the same event is more efficient. See the following example:
-a always,exit -F arch=b32 -S openat,open_by_handle_at -F a2&0100 -F success=1 -F auid>=1000 -F auid!=unset -F key=successful-create
Rationale
Successful attempts to access files could be an indicator of malicious activity on a system. Auditing these events could serve as evidence of potential system compromise.
- ID
- xccdf_org.ssgproject.content_rule_audit_rules_successful_file_modification_openat_o_creat
- Severity
- Medium
- Updated