mirror of
https://github.com/splunk/security_content
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Bhavin Patel
75 lines
3.2 KiB
YAML
75 lines
3.2 KiB
YAML
name: Linux Sudo OR Su Execution
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id: 4b00f134-6d6a-11ec-a90c-acde48001122
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version: 2
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date: '2024-05-17'
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author: Teoderick Contreras, Splunk
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status: production
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type: Hunting
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description: The following analytic detects the execution of the "sudo" or "su" command
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on a Linux operating system. It leverages data from Endpoint Detection and Response
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(EDR) agents, focusing on process names and parent process names. This activity
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is significant because "sudo" and "su" commands are commonly used by adversaries
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to elevate privileges, potentially leading to unauthorized access or control over
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the system. If confirmed malicious, this activity could allow attackers to execute
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commands with root privileges, leading to severe security breaches, data exfiltration,
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or further system compromise.
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data_source:
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- Sysmon for Linux EventID 1
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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 ("sudo",
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"su") OR Processes.parent_process_name IN ("sudo", "su") by Processes.dest Processes.user
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Processes.parent_process_name Processes.process_name Processes.process Processes.process_id
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Processes.parent_process_id Processes.process_guid | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `linux_sudo_or_su_execution_filter`'
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how_to_implement: The detection is based on data that originates from Endpoint Detection
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and Response (EDR) agents. These agents are designed to provide security-related
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telemetry from the endpoints where the agent is installed. To implement this search,
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you must ingest logs that contain the process GUID, process name, and parent process.
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Additionally, you must ingest complete command-line executions. These logs must
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be processed using the appropriate Splunk Technology Add-ons that are specific to
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the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
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data model. Use the Splunk Common Information Model (CIM) to normalize the field
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names and speed up the data modeling process.
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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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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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asset_type: Endpoint
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confidence: 30
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impact: 30
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message: A commandline $process$ that execute sudo or su in $dest$
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mitre_attack_id:
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- T1548.003
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- T1548
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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: 9
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1548.003/sudo_su/sysmon_linux.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon:linux
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