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P4T12ICK
76 lines
2.7 KiB
YAML
76 lines
2.7 KiB
YAML
name: Linux Visudo Utility Execution
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id: 08c41040-624c-11ec-a71f-acde48001122
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version: 1
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date: '2021-12-21'
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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 looks for suspicious commandline that add entry to
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/etc/sudoers by using visudo utility tool in linux platform. This technique may
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abuse by adversaries, malware author and red teamers to gain elevated privilege
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to targeted or compromised host. /etc/sudoers file controls who can run what commands
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as what users on what machines and can also control special things such as whether
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you need a password for particular commands. The file is composed of aliases (basically
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variables) and user specifications (which control who can run what).
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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 = visudo
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by Processes.dest Processes.user Processes.parent_process_name Processes.process_name
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Processes.process Processes.process_id Processes.parent_process_id Processes.process_guid
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `linux_visudo_utility_execution_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://askubuntu.com/questions/334318/sudoers-file-enable-nopasswd-for-user-all-commands
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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: 40
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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/T1548.003/visudo/sysmon_linux.log
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impact: 40
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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: 16
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security_domain: endpoint
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asset_type: Endpoint
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