Name:Linux Root Execution of id id:538dc501-ce3a-4a32-9f56-6dbe0aee1474 version:1 date:None author:Raven Tait, Splunk status:production type:Anomaly Description:The following analytic detects the execution of the `id` command by the root user on Linux systems. Attackers commonly run `id` during post-exploitation to confirm they have achieved root-level privileges after a privilege escalation attempt.
This activity is significant because it may indicate an attacker is verifying superuser access following a successful compromise.
If confirmed malicious, this could signal that an attacker has gained full control of the system, enabling them to perform destructive actions, exfiltrate sensitive data, or establish persistent unauthorized access. Data_source:
-Sysmon for Linux EventID 1
search:| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime
how_to_implement:The detection is based on data that originates from Endpoint Detection and Response (EDR) agents. These agents are designed to provide security-related telemetry from the endpoints where the agent is installed. To implement this search, you must ingest logs that contain the process GUID, process name, and parent process. Additionally, you must ingest complete command-line executions. These logs must be processed using the appropriate Splunk Technology Add-ons that are specific to the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint` data model. Use the Splunk Common Information Model (CIM) to normalize the field names and speed up the data modeling process. known_false_positives:Administrators and automated scripts routinely run the id command as root for system auditing or configuration tasks. Filter based on known administrative activity or trusted scripts. References: drilldown_searches: earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View the detection results for - "$user$" and "$dest$"' search:'%original_detection_search% | search user = "$user$" dest = "$dest$"' name:'View risk events for the last 7 days for - "$user$" and "$dest$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$", "$dest$") | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`' earliest_offset:'7d' latest_offset:'0' analytic_story:['Linux Post-Exploitation', 'Linux Privilege Escalation', 'Linux Persistence Techniques']
