Top Risks

• THREAT FEED: extension ID independently confirmed malicious by TPCI chrome-mal-ids — Dark Magic Skull Live Wallpaper [adware] + malext.io malicious_extension_sentry (+2.5, capped).
• NewTab override gives extension full control of every new tab opened by the user.
• Uninstall and install URL hijacks open gameograf.com with UTM tracking on every install/uninstall.
• No CSP declared (MV3 default applies but no explicit policy); innerHTML sinks present without CSP guard.
• No developer name listed in store; reduces accountability.

Evidence

• newtab_override manifest chrome_url_overrides.newtab set to newtab.html — controls every new tab, high reach.
• uninstall_url_hijack manifest setUninstallURL → https://gameograf.com/?utm_source=extension&utm_medium=install (3rd-party UTM).
• install_url_hijack manifest onInstalled opens https://gameograf.com/?utm_source=lofi&utm_medium=install.
• dom_xss_sinks crx innerHTML assigned from variable in popup.js and calendar.js; no CSP to mitigate XSS.
• no_developer_name store developer_name is empty string; reduces publisher accountability.
• verified_publisher store Extension carries verified_publisher badge; partial reputation mitigation.
• privacy_policy_adequate api Policy fetched, scoped to extension, covers data collection, retention, and third-party sharing.
• low_installs store Only 157 installs; low blast radius but uninstall/install hijack still active on each user.
• threat_feed_membership api Extension ID listed by TPCI chrome-mal-ids — Dark Magic Skull Live Wallpaper [adware] + malext.io malicious_extension_sentry; score 3.15 -> 5.65 (+2.5 cap 2.5).

Permissions Breakdown

• search medium Allows reading or modifying search provider; medium risk in context of NewTab override.
• host_permissions: https://api.gameograf.com/* low Scoped to dev-controlled domain only; expected for a wallpaper/NewTab extension.
• chrome_url_overrides.newtab medium Replaces new-tab page; high reach, every new tab opened by user is controlled by extension.

Pillar Scores

Bookkeeping