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P4T12ICK
82 lines
2.8 KiB
YAML
82 lines
2.8 KiB
YAML
name: Linux Kernel Module Enumeration
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id: 6df99886-0e04-4c11-8b88-325747419278
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version: 1
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date: '2022-07-27'
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author: Michael Haag, Splunk
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status: production
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type: Anomaly
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description: The following analytic identifies the process kmod being utilized to
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list kernel modules in use. Typically, this is not seen as malicious, however it
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may be a precurser to the use of insmod to install a module.
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data_source:
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- Sysmon Event ID 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=kmod
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Processes.process IN ("*lsmod*", "*list*") by Processes.dest Processes.user Processes.parent_process_name
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Processes.process_name Processes.process Processes.process_id Processes.parent_process_id
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `linux_kernel_module_enumeration_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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known_false_positives: False positives are present based on automated tooling or system
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administrative usage. Filter as needed.
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references:
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- https://man7.org/linux/man-pages/man8/kmod.8.html
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tags:
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analytic_story:
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- Linux Rootkit
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asset_type: Endpoint
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confidence: 50
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impact: 30
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest$ by user $user$ enumeration kernel modules.
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mitre_attack_id:
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- T1082
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- T1014
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observable:
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- name: user
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type: User
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role:
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- Victim
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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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- name: parent_process_name
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type: Process
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role:
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- Parent Process
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- name: process_name
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type: Process
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role:
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- Child Process
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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.parent_process
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- Processes.original_file_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_path
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- Processes.process_path
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- Processes.parent_process_id
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risk_score: 15
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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: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1082/atomic_red_team/linux-sysmon.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon_linux
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update_timestamp: true
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