mirror of
https://github.com/splunk/security_content
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Bhavin Patel
75 lines
2.9 KiB
YAML
75 lines
2.9 KiB
YAML
name: Kubernetes Suspicious Image Pulling
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id: 4d3a17b3-0a6d-4ae0-9421-46623a69c122
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version: 2
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date: '2024-05-13'
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author: Patrick Bareiss, Splunk
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status: production
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type: Anomaly
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description: 'The following analytic detects suspicious image pulling in Kubernetes
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environments. It identifies this activity by monitoring Kubernetes audit logs for
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image pull requests that do not match a predefined list of allowed images. This
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behavior is significant for a SOC as it may indicate an attacker attempting to deploy
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malicious software or infiltrate the system. If confirmed malicious, the impact
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could be severe, potentially leading to unauthorized access to sensitive systems
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or data, and enabling further malicious activities within the cluster.'
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data_source:
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- Kubernetes Audit
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search: '`kube_audit` requestObject.message="Pulling image*"
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| search NOT `kube_allowed_images`
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| fillnull
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| stats count by objectRef.name objectRef.namespace objectRef.resource requestReceivedTimestamp requestURI responseStatus.code sourceIPs{} stage
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user.groups{} user.uid user.username userAgent verb
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| rename sourceIPs{} as src_ip, user.username as user
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| `kubernetes_suspicious_image_pulling_filter`'
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how_to_implement: The detection is based on data that originates from Kubernetes Audit logs. Ensure that audit logging is enabled in your Kubernetes cluster.
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Kubernetes audit logs provide a record of the requests made to the Kubernetes API server, which is crucial for monitoring and detecting suspicious activities.
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Configure the audit policy in Kubernetes to determine what kind of activities are logged. This is done by creating an Audit Policy and providing it to the API server.
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Use the Splunk OpenTelemetry Collector for Kubernetes to collect the logs. This doc will describe how to collect the audit log file https://github.com/signalfx/splunk-otel-collector-chart/blob/main/docs/migration-from-sck.md.
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known_false_positives: unknown
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references:
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- https://kubernetes.io/docs/tasks/debug/debug-cluster/audit/
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tags:
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analytic_story:
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- Kubernetes Security
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asset_type: Kubernetes
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confidence: 70
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impact: 70
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message: Suspicious image $objectRef.name$ pulled in Kubernetes from ip $src_ip$
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by user $user$
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mitre_attack_id:
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- T1526
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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: src_ip
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type: IP Address
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role:
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- Attacker
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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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- verb
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- requestReceivedTimestamp
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- requestURI
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- responseStatus.code
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- sourceIPs{}
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- user.groups{}
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- user.username
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- userAgent
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- verb
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- responseStatus.reason
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- responseStatus.status
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risk_score: 49
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security_domain: network
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tests:
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- name: True Positive Test
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attack_data:
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- data:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1526/kubernetes_audit_pull_image/kubernetes_audit_pull_image.json
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sourcetype: _json
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source: kubernetes
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