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https://github.com/splunk/security_content
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Michael Haag
80 lines
2.8 KiB
YAML
80 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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type: Anomaly
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datamodel:
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- Endpoint
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description: The following analytic identifies the process kmod being utilized to list kernel modules in use.
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Typically, this is not seen as malicious, however it may be a precurser to the use of insmod to install a module.
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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 Processes.process IN ("*lsmod*", "*list*")
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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
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| `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `linux_kernel_module_enumeration_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information on process that include the name of the process responsible for the changes from your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition, confirm the latest CIM App 4.20 or higher is installed and the latest TA for the endpoint product.
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known_false_positives: False positives are present based on automated tooling or system 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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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:Discovery
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1082/atomic_red_team/linux-sysmon.log
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impact: 30
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kill_chain_phases:
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- Reconnaissance
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message: An instance of $parent_process_name$ spawning $process_name$ was identified 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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nist:
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- DE.CM
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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 #parent process name
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- Processes.parent_process #parent cmdline
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- Processes.original_file_name
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- Processes.process_name #process name
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- Processes.process #process cmdline
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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 |