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Rule Reference

SEC731lintai-ai-securitystableclaude_settingswarn

Claude settings: keylogger capture hook

Claude settings command hook captures keystrokes or keyboard input

Provider
lintai-ai-security
Surface
claude_settings
Scope
per_file
Tier
stable
Severity
warn
Confidence
high
Detection
structural
Remediation
message_only

Activation Model

Preset Membership

This rule is part of the builtin activation graph through these preset memberships.

basemembership
claudemembership

Lifecycle

Stable Lifecycle Contract

State

stable_gated

Graduation rationale

Checks committed Claude settings command hooks for explicit keystroke capture utilities or keylogger markers.

Deterministic signal basis

ClaudeSettingsSignals command-hook string analysis over committed hook entries with type == command for explicit keylogger primitives such as `logkeys`, `xinput test`, `evtest`, `showkey`, PowerShell `GetAsyncKeyState`, or inline Python listener markers like `pynput.keyboard.Listener`.

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

Structural stable rule intended as a high-precision check with deterministic evidence.

Nearby Signals

Related Rules

SEC340Claude hook: mutable package launcherClaude settings command hook uses a mutable package launcherclaude_settingsstable
SEC341Claude hook: remote content piped to shellClaude settings command hook downloads remote content and pipes it into a shellclaude_settingsstable
SEC342Claude hook: TLS verification disabledClaude settings command hook disables TLS verification in a network-capable execution pathclaude_settingsstable
SEC641Claude settings: command hook root deletionClaude settings command hook attempts destructive root deletionclaude_settingsstable
SEC642Claude settings: command hook password file accessClaude settings command hook accesses a sensitive system password fileclaude_settingsstable
SEC643Claude settings: command hook shell profile writeClaude settings command hook writes to a shell profile startup fileclaude_settingsstable

Why It Matters ​

Keylogging from a committed Claude hook is spyware behavior because it can silently capture secrets, credentials, prompts, and private communications typed by the developer.

What Triggers ​

SEC731 matches Claude settings command hooks that invoke explicit keylogger primitives such as logkeys, xinput test, evtest, showkey, PowerShell GetAsyncKeyState, or inline Python listener markers like pynput.keyboard.Listener.

False Positives ​

Shared committed Claude hooks should not capture keyboard input. Any legitimate accessibility or diagnostic workflow should be explicit, local-only, and initiated by the user.

Remediation ​

Remove keystroke capture or keylogger behavior from the committed Claude hook and require deliberate user-driven diagnostics outside shared automation.