{"items":[{"id":"NVI-00010981","kind":"supply_chain_event","title":"Malicious code in contoso-login-sim-loader (npm)","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-98rj-4grx-g355"],"plain_summary":"GitHub lists this malware advisory for contoso-login-sim-loader. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-804d247615281dc24fd4cf2b9d6dd9f5"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-804d247615281dc24fd4cf2b9d6dd9f5","url":"https://github.com/advisories/GHSA-98rj-4grx-g355","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-98rj-4grx-g355","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:13:45.671Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-804d247615281dc24fd4cf2b9d6dd9f5"],"technology":"contoso-login-sim-loader","known_exclusions":[],"conditions_summary":"## Source: amazon-inspector (062ce76699c91a883d24e3ad609bb04faa3f52cbeaecfb24c1c3bcde8b496a5c)\nPackage ships a single ~138 KB browser script whose entire body is an RC4-encrypted base64 blob decoded at runtime by an inline RC4 routine (`_zc`) with a DJB2 helper (`_zh`) and a key reconstructed by XORing a numeric array with 1410^714. Before decryption the script performs anti-analysis guards: a devtools-size heuristic (`if(_gz>160||_gp>160)return;`) that aborts execution when developer tools are open, and a block that overwrites `console.log/info/warn/debug/error` to no-ops to suppress runtime tracing. The package name `contoso-login-sim-loader` self-describes as a 'login sim(ulator) loader' while the published description reframes it as a generic 'Client-side asset loader that renders a self-contained UI component when included via a script tag.' The tarball ships no source, no exports, no dependencies, and no documentation - only the opaque encrypted payload. Any site that follows the include-via-script-tag guidance embeds attacker-controlled JavaScript, decrypted only in end-user browsers, into its own pages; the concealed payload cannot be audited without executing it, and the n","public_affected_ranges":["= 1.0.1"]}],"null_published_at":"2026-10-31T23:18:22.417Z","source_updated_at":"2026-09-30T06:31:54.000Z","source_disclosed_at":"2026-09-30T06:31:43.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T23:13:45.671Z"}],"next_cursor":null,"snapshot_revision":"44495"}