mirror of
https://github.com/splunk/security_content
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Bhavin Patel
80 lines
3.7 KiB
YAML
80 lines
3.7 KiB
YAML
name: Linux Service Started Or Enabled
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id: e0428212-61b7-11ec-88a3-acde48001122
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version: 2
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date: '2024-01-24'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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description: The following analytic detects the creation or enabling of services in
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Linux platforms, specifically using the systemctl or service tool application. This
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behavior is worth identifying as adversaries may create or modify services to execute
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malicious payloads as part of persistence. Legitimate services created by administrators
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for automation purposes may also trigger this analytic, so it is important to update
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the filter macros to remove false positives. If a true positive is found, it suggests
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an possible attacker is attempting to persist within the environment or deliver
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additional malicious payloads, leading to data theft, ransomware, or other damaging
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outcomes. To implement this analytic, ensure you are ingesting logs with the process
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name, parent process, and command-line executions from your endpoints.
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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 IN ("systemctl",
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"service") OR Processes.process IN ("*systemctl *", "*service *")) Processes.process
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IN ("* start *", "* enable *") AND NOT (Processes.os="Microsoft Windows" OR Processes.vendor_product="Microsoft Windows")
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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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Processes.process_guid | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `linux_service_started_or_enabled_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 use this commandline
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for automation purposes. Please update the filter macros to remove false positives.
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references:
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- https://attack.mitre.org/techniques/T1543/003/
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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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- Linux Living Off The Land
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- Scheduled Tasks
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asset_type: Endpoint
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confidence: 70
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impact: 60
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message: a commandline $process$ that may create or start a service on $dest
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mitre_attack_id:
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- T1053.006
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- T1053
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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: 42
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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/T1053.006/service_systemd/sysmon_linux.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon_linux
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