mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Eric McGinnis
105 lines
4.9 KiB
YAML
105 lines
4.9 KiB
YAML
name: Linux Docker Shell Execution
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id: 03b2b286-fa86-4ec9-b1a1-ec19d314bdf7
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version: 4
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creation_date: '2026-03-10'
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modification_date: '2026-05-13'
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author: Gowthamaraj Rajendran, Splunk, Emil Elsetrønning
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status: production
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type: Anomaly
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description: |
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This detection identifies shell execution activity associated with Docker containers on Linux systems.
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Specifically, it monitors for interactive or non-interactive shell processes (e.g., `/bin/bash`, `/bin/sh`, `/bin/zsh`) launched via Docker commands such as `docker exec`, or through container entrypoint overrides.
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Shell execution inside a container may indicate administrative troubleshooting activity.
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However, it can also represent post-exploitation behavior, where an attacker gains access to a container and spawns a shell to execute arbitrary commands, establish persistence, or pivot to the host.
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data_source:
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- Sysmon for Linux EventID 1
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search: |-
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| tstats `security_content_summariesonly`
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count min(_time) as firstTime
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max(_time) as lastTime
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from datamodel=Endpoint.Processes where
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Processes.process_name=docker*
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Processes.process="* exec *"
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Processes.process IN (
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"* /bin/bash *",
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"* /bin/dash *",
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"* /bin/sh *",
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"* /bin/zsh *",
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"* bash *",
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"* bash",
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"* dash *",
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"* dash",
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"* sh *",
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"* sh",
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"* zsh *",
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"* zsh"
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)
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by Processes.action Processes.dest Processes.original_file_name
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Processes.parent_process Processes.parent_process_exec
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Processes.parent_process_guid Processes.parent_process_id
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Processes.parent_process_name Processes.parent_process_path
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Processes.process Processes.process_exec Processes.process_guid
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Processes.process_hash Processes.process_id
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Processes.process_integrity_level Processes.process_name
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Processes.process_path Processes.user Processes.user_id Processes.vendor_product
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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)`
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| `linux_docker_shell_execution_filter`
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how_to_implement: |
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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: |
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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://docs.docker.com/reference/cli/docker/container/exec/
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- https://gtfobins.github.io/gtfobins/docker/
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drilldown_searches:
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- name: View the detection results for - "$dest$"
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search: '%original_detection_search% | search dest = "$dest$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$") | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
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earliest_offset: 7d
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latest_offset: "0"
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intermediate_findings:
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entities:
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- field: dest
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type: system
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score: 20
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message: $user$ on endpoint $dest$ spawned a shell in a docker container via the commandline $process$
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- field: user
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type: user
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score: 20
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message: $user$ on endpoint $dest$ spawned a shell in a docker container via the commandline $process$
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threat_objects:
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- field: process
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type: process
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analytic_story:
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- Linux Privilege Escalation
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- Linux Living Off The Land
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asset_type: Endpoint
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mitre_attack_id:
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- T1059.013
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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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category: endpoint
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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/T1548/docker/sysmon_linux.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon:linux
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test_type: unit
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