LWA-2026-4834 MAL-2026-5703 ↗ confirmed malware

eslint-plugin-mistica-local-rules@19.12.11

Malicious code in eslint-plugin-mistica-local-rules (npm)

T1195.002 · Compromise Software Supply ChainT1059.007 · JavaScriptT1082 · System Information DiscoveryT1071.001 · Web ProtocolsT1041 · Exfiltration Over C2 Channel

Analysis

Combosquats the real eslint-plugin-mistica design-system plugin at an inflated version. Its preinstall hook runs index.js, which collects detailed system information (hostname, platform, arch, user info including uid/gid/shell, OS type/release/memory/CPU count, whoami, id output, cwd) and POSTs it as JSON to eucfugc8bk66haszliir75yd74dv1lpa[.]oastify[.]com/detox56. A bundled file package/i contains harvested Instagram follower data (names, usernames, timestamps). The host-fingerprinting beacon to an out-of-band exfil endpoint is clear reconnaissance malware.

analyzed by
Leitwacht
first seen
Jun 12, 2026, 06:40 PM
analyzed
Jun 12, 2026, 06:40 PM

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Independently detected by the Leitwacht supply-chain probe. IOCs are defanged. Published CC0. Think this is a mistake? See the dispute policy.