This analytic is to detect a possible access or modification of /etc/sudoers file. “/etc/sudoers” file controls who can run what command as what users on what machine and can also control whether a specific user need a password for particular commands. adversaries and threat actors abuse this file to gain persistence and/or privilege escalation during attack on targeted host.
- Type: Anomaly
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Endpoint
- Last Updated: 2022-01-10
- Author: Teoderick Contreras, Splunk
- ID: 4479539c-71fc-11ec-b2e2-acde48001122
Kill Chain Phase
- CIS 3
- CIS 5
- CIS 16
1 2 3 4 5 6 | tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process_name IN("cat", "nano*","vim*", "vi*") AND Processes.process IN("*/etc/sudoers*") by Processes.dest Processes.user Processes.parent_process_name Processes.process_name Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `linux_possible_access_to_sudoers_file_filter`
The SPL above uses the following Macros:
linux_possible_access_to_sudoers_file_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
How To Implement
To successfully implement this search, you need to be ingesting logs with the process name, parent process, and command-line executions from your endpoints. If you are using Sysmon, you can use the Add-on for Linux Sysmon from Splunkbase.
Known False Positives
administrator or network operator can execute this command. Please update the filter macros to remove false positives.
Associated Analytic story
|25.0||50||50||A commandline $process$ executed on $dest$|
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
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