splApache-2.0from splunk/security_content

Linux Emacs Privilege Escalation

The following analytic detects the execution of Emacs with elevated privileges using the `sudo` command and the `--eval` option. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on process execution logs that include command-line arguments. This activity is significant because it indicates a potential privilege escalation attempt, where a user could gain root access by running Emacs with elevated permissions. If confirmed malicious, this could allow an attacker to execute arbitrary commands as root, leading to full system compromise and unauthorized access to sensitive information.

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Rule sourcedetections/endpoint/linux_emacs_privilege_escalation.yml

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Processes
  WHERE Processes.process="*emacs*"
    AND
    Processes.process="*--eval*"
    AND
    Processes.process="*sudo*"
  BY Processes.action Processes.dest Processes.original_file_name
     Processes.parent_process Processes.parent_process_exec Processes.parent_process_guid
     Processes.parent_process_id Processes.parent_process_name Processes.parent_process_path
     Processes.process Processes.process_exec Processes.process_guid
     Processes.process_hash Processes.process_id Processes.process_integrity_level
     Processes.process_name Processes.process_path Processes.user
     Processes.user_id Processes.vendor_product
| `drop_dm_object_name(Processes)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `linux_emacs_privilege_escalation_filter`