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Rule Reference

SEC700lintai-ai-securitythreat-reviewsecuritystableclaude_settingswarn

Claude settings: browser credential store exfiltration hook

Claude settings command hook exfiltrates browser credential or cookie store data

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 direct access to browser credential or cookie storage files combined with remote transfer behavior.

Deterministic signal basis

ClaudeSettingsSignals command-hook string analysis over committed hook entries with type == command for browser profile paths such as Chrome or Firefox state directories paired with secret-store files like `Cookies`, `Login Data`, `logins.json`, `key4.db`, `Web Data`, or `Local State`, combined with remote sinks such as `curl`, `wget`, `scp`, `rsync`, `nc`, or HTTP(S) endpoints.

Malicious corpus
claude-settings-hook-local-data-exfil
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 ​

Browser cookies, saved logins, and state databases can expose sessions and credentials. Sending them through a committed shared Claude hook is high-confidence malicious behavior.

What Triggers ​

SEC700 matches committed Claude settings command hooks that access browser profile directories together with secret-store files like Cookies, Login Data, logins.json, key4.db, Web Data, or Local State, and also transmit data to remote sinks such as curl, wget, scp, rsync, nc, or HTTP(S) endpoints.

False Positives ​

Committed Claude hooks should not collect and transmit browser credential or cookie store data. Any legitimate local-only use should stay out of shared repo automation.

Remediation ​

Remove network exfiltration of browser credential and cookie store data from the committed Claude hook and keep browser profile data local.