mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Gowthamaraj rajendran
90 lines
4.2 KiB
YAML
90 lines
4.2 KiB
YAML
name: Linux Service Restarted
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id: 084275ba-61b8-11ec-8d64-acde48001122
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version: 1
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date: '2023-04-14'
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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 restarting or re-enabling of services
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in the Linux platform. It focuses on the use of the systemctl or service tools for
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executing these actions. Adversaries may leverage this technique to repeatedly execute
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malicious payloads as a form of persistence. Linux hosts typically start services
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during boot to perform background system functions. However, administrators may
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also create legitimate services for specific tools or applications as part of task
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automation. In such cases, it is recommended to verify the service path of the registered
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script or executable and identify the creator of the service for further validation.\
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It''s important to be aware that this analytic may generate false positives as administrators
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or network operators may use the same command-line for legitimate automation purposes.
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Filter macros should be updated accordingly to minimize false positives.\
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Identifying restarted or re-enabled services is valuable for a SOC as it can indicate
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potential malicious activities attempting to maintain persistence or execute unauthorized
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actions on Linux systems. By detecting and investigating these events, security
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analysts can respond promptly to mitigate risks and prevent further compromise.
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The impact of a true positive can range from unauthorized access to data destruction
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or other damaging outcomes.'
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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 ("*restart*", "*reload*", "*reenable*") 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_restarted_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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- AwfulShred
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- Linux Privilege Escalation
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- Linux Living Off The Land
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- Data Destruction
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- Linux Persistence Techniques
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- Scheduled Tasks
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asset_type: Endpoint
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confidence: 50
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impact: 50
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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: 25
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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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