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P4T12ICK
75 lines
2.7 KiB
YAML
75 lines
2.7 KiB
YAML
name: Linux Possible Access To Sudoers File
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id: 4479539c-71fc-11ec-b2e2-acde48001122
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version: 1
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date: '2022-01-10'
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author: Teoderick Contreras, Splunk
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type: Anomaly
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datamodel:
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- Endpoint
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description: This analytic is to detect a possible access or modification of /etc/sudoers
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file. "/etc/sudoers" file controls who can run what command as what users on what
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machine and can also control whether a specific user need a password for particular
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commands. adversaries and threat actors abuse this file to gain persistence and/or
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privilege escalation during attack on targeted host.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.process_name IN("cat",
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"nano*","vim*", "vi*") AND Processes.process IN("*/etc/sudoers*") by Processes.dest
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Processes.user Processes.parent_process_name Processes.process_name Processes.process
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Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `linux_possible_access_to_sudoers_file_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints. If you are using Sysmon, you can use the Add-on for Linux Sysmon from
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Splunkbase.
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known_false_positives: administrator or network operator can execute this command.
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Please update the filter macros to remove false positives.
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references:
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- https://attack.mitre.org/techniques/T1548/003/
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- https://web.archive.org/web/20210708035426/https://www.cobaltstrike.com/downloads/csmanual43.pdf
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tags:
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analytic_story:
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- Linux Privilege Escalation
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- Linux Persistence Techniques
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automated_detection_testing: passed
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cis20:
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- CIS 3
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- CIS 5
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- CIS 16
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confidence: 50
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context:
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- Source:Endpoint
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- Stage:Privilege Escalation
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- Stage:Persistence
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1003.008/copy_file_stdoutpipe/sysmon_linux.log
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impact: 50
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kill_chain_phases:
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- Exploitation
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message: A commandline $process$ executed on $dest$
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mitre_attack_id:
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- T1548.003
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- T1548
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nist:
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- DE.CM
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observable:
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- name: dest
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type: Hostname
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role:
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- Victim
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- Processes.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_id
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risk_score: 25
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security_domain: endpoint
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asset_type: Endpoint
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