mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Bhavin Patel
70 lines
2.6 KiB
YAML
70 lines
2.6 KiB
YAML
name: GitHub Pull Request from Unknown User
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id: 9d7b9100-8878-4404-914e-ca5e551a641e
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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 pull requests from unknown users on GitHub.
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It uses a Splunk query to identify pull requests where the user ID is not specified
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and cross-references these with a known users lookup table. This activity is significant
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because pull requests from unknown users can introduce malicious code or unauthorized
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changes to repositories. If confirmed malicious, this could lead to unauthorized
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code changes, data breaches, or other security incidents. Immediate steps include
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reviewing the author's name, repository, head reference, and commit message, and
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investigating any related artifacts and processes.
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data_source:
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- GitHub
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search: '`github` check_suite.pull_requests{}.id=* | stats count by check_suite.head_commit.author.name
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repository.full_name check_suite.pull_requests{}.head.ref check_suite.head_commit.message
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| rename check_suite.head_commit.author.name as user repository.full_name as repository
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check_suite.pull_requests{}.head.ref as ref_head check_suite.head_commit.message
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as commit_message | search NOT `github_known_users` | eval phase="code" | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `github_pull_request_from_unknown_user_filter`'
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how_to_implement: You must index GitHub logs. You can follow the url in reference
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to onboard GitHub logs.
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known_false_positives: unknown
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references:
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- https://www.splunk.com/en_us/blog/tips-and-tricks/getting-github-data-with-webhooks.html
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tags:
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analytic_story:
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- Dev Sec Ops
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asset_type: GitHub
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confidence: 90
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impact: 30
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message: Vulnerabilities found in packages used by GitHub repository $repository$
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mitre_attack_id:
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- T1195.001
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- T1195
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observable:
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- name: repository
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type: Other
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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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- alert.id
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- repository.full_name
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- repository.html_url
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- action
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- alert.affected_package_name
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- alert.affected_range
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- alert.created_at
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- alert.external_identifier
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- alert.external_reference
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- alert.fixed_in
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- alert.severity
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risk_score: 27
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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/T1195.001/github_pull_request/github_pull_request.json
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sourcetype: aws:firehose:json
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source: github
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