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Rule Reference

SEC679lintai-ai-securitythreat-reviewsecuritystableclaude_settingswarn

Claude settings: webhook secret exfiltration

Claude settings command hook posts secret material to a webhook endpoint

Public lane
threat-review
Category
security
Provider
lintai-ai-security
Scope
per-file
Surface
claude_settings
Tier
stable
Severity
warn
Confidence
high
Detection
structural
Remediation
message only
How to read this lane

Explicit malicious, secret-bearing, or spyware-like review.

How to read this category

Strong exploit, secret, or unsafe-execution signal.

Activation Model

Preset Activation

These presets explain where this rule appears in the product experience.

threat-reviewsidecar lane
claudesurface preset

Lifecycle

Stable Lifecycle Contract

State

stable

Graduation rationale

Checks committed Claude settings command hooks for secret-bearing posts to webhook endpoints.

Deterministic signal basis

ClaudeSettingsSignals command-hook string analysis over committed hook entries with type == command for secret markers plus webhook endpoint markers such as `hooks.slack.com/services/` or `discord.com/api/webhooks/`.

Malicious corpus
claude-settings-hook-secret-exfil-payloads
Benign corpus
claude-settings-network-command-safe
structured evidence required remediation reviewed
Canonical note

Structural stable rule positioned as an explicit threat-review control: high-signal malicious, credential-bearing, or spyware-like behavior that stays opt-in rather than shaping the quiet default.

Nearby Signals

Related Rules

SEC641Claude settings: command hook root deletionClaude settings command hook attempts destructive root deletionthreat-reviewsecurityclaude_settings
SEC642Claude settings: command hook password file accessClaude settings command hook accesses a sensitive system password filethreat-reviewsecurityclaude_settings
SEC643Claude settings: command hook shell profile writeClaude settings command hook writes to a shell profile startup filethreat-reviewsecurityclaude_settings
SEC644Claude settings: command hook authorized_keys writeClaude settings command hook writes to SSH authorized_keysthreat-reviewsecurityclaude_settings
SEC655Claude settings: command hook cron persistenceClaude settings command hook manipulates cron persistencethreat-reviewsecurityclaude_settings
SEC656Claude settings: command hook systemd persistenceClaude settings command hook registers a systemd service or unit for persistencethreat-reviewsecurityclaude_settings

Why It Matters ​

Webhook collectors make exfiltration easy because they can receive arbitrary posted payloads with minimal authentication or setup.

What Triggers ​

SEC679 matches committed Claude command hooks that combine secret markers with webhook endpoints such as Slack or Discord webhook URLs.

False Positives ​

Benign webhook notifications should not contain copied secret values. This rule only targets the secret-bearing variant.

Remediation ​

Remove the secret-bearing webhook post from the committed Claude hook and keep notifications free of credential material.