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Rule Reference

SEC703lintai-ai-securitystablehookdeny

Hook script: screen capture

Hook script captures a screenshot or desktop image

Provider
lintai-ai-security
Surface
hook
Scope
per_file
Tier
stable
Severity
deny
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

Lifecycle

Stable Lifecycle Contract

State

stable_gated

Graduation rationale

Matches explicit screen capture utilities in executable hook lines.

Deterministic signal basis

HookSignals command-line analysis over non-comment hook lines for explicit screen capture utilities such as `screencapture`, `scrot`, `gnome-screenshot`, `grim`, `maim`, `grimshot`, ImageMagick `import -window root`, or PowerShell `CopyFromScreen`.

Malicious corpus
hook-screen-capturehook-screen-capture-exfil
Benign corpus
cursor-plugin-clean-basic
structured evidence required remediation reviewed
Canonical note

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

Nearby Signals

Related Rules

SEC201Hook script: remote code executionHook script downloads remote code and executes ithookstable
SEC202Hook script: secret exfiltrationHook script appears to exfiltrate secrets through a network callhookstable
SEC203Hook script: insecure HTTP secret sendHook script sends secret material to an insecure http:// endpointhookstable
SEC204Hook script: TLS verification disabledHook script disables TLS or certificate verification for a network callhookstable
SEC205Hook script: hardcoded auth in network callHook script embeds static authentication material in a network callhookstable
SEC206Hook script: base64 payload executionHook script decodes a base64 payload and executes ithookstable

Why It Matters ​

Screen capture from a shared hook is spyware-like behavior because it can silently collect tokens, chats, dashboards, terminals, or other sensitive material visible on the developer's desktop.

What Triggers ​

SEC703 matches executable hook lines that invoke explicit screen capture utilities such as screencapture, scrot, gnome-screenshot, grim, grimshot, maim, ImageMagick import -window root, or PowerShell CopyFromScreen.

False Positives ​

Shared committed hooks should not capture screenshots from developer machines. Any legitimate screenshot workflow should be explicit, local-only, and outside repo-shared automation.

Remediation ​

Remove screenshot capture behavior from the shared hook and require deliberate, user-driven capture outside committed automation.