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Detection rules › Panther

GitHub Repository Visibility Change

Severity
high
Log types
GitHub.Audit
Tags
GitHub, Exfiltration:Exfiltration Over Web Service
Reference
https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/managing-repository-settings/setting-repository-visibility
Source
github.com/panther-labs/panther-analysis

Detects when an organization repository visibility changes.

MITRE ATT&CK coverage

TacticTechniques
ExfiltrationT1567 Exfiltration Over Web Service

Rules detecting the same action

Other rules on this platform that filter on the same API call or operation.

Rule body yaml

AnalysisType: rule
Filename: github_repo_visibility_change.py
RuleID: "Github.Repo.VisibilityChange"
DisplayName: "GitHub Repository Visibility Change"
Enabled: true
LogTypes:
  - GitHub.Audit
Tags:
  - GitHub
  - Exfiltration:Exfiltration Over Web Service
Reports:
  MITRE ATT&CK:
    - TA0010:T1567
Reference: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/managing-repository-settings/setting-repository-visibility
Severity: High
Description: Detects when an organization repository visibility changes.
Tests:
  - Name: GitHub - Repo Visibility Change
    ExpectedResult: true
    Log:
      {
        "actor": "cat",
        "action": "repo.access",
        "created_at": 1621305118553,
        "org": "my-org",
        "p_log_type": "GitHub.Audit",
        "repo": "my-org/my-repo",
      }
  - Name: GitHub - Repo disabled
    ExpectedResult: false
    Log:
      {
        "actor": "cat",
        "action": "repo.disable",
        "created_at": 1621305118553,
        "org": "my-org",
        "p_log_type": "GitHub.Audit",
        "repo": "my-org/my-repo",
      }

Detection logic

Condition

action eq "repo.access"

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
actioneq
  • repo.access

Output fields

Fields the rule emits when it matches. Chronicle authors list these in the outcome block; they appear on the detection and $risk_score drives alerting. Sentinel / Defender XDR rules build them up through project / summarize / extend stages. Sentinel maps these into alert fields via entityMappings and customDetails; Defender XDR custom detections surface them as alert fields directly.

Field
repo