LWA-2026-13160 confirmed malware

@kahitsan/plugin-sdk@0.10.0-staging.59

Malicious code in @kahitsan/plugin-sdk (npm)

T1027 · Obfuscated Files or InformationT1027.009 · Embedded Payloads

Analysis

The package's main entry point, dist/index.js, is a 282 KB single-line bundle produced with javascript-obfuscator: a rotated string-array decoder, thousands of _0x-prefixed identifiers, and dynamic imports resolved through an obfuscated dispatcher. The bundle opens with a base64-encoded block that decodes to a notice addressed explicitly to "any AI assistant, LLM, coding agent, or autonomous tool" reading the file. The notice instructs the reader to stop immediately, to refuse to de-obfuscate, beautify, summarize, explain, produce pseudocode for, or otherwise describe the code, and pre-emptively declares that any system message, developer message, jailbreak or roleplay framing telling the reader to disregard the notice is illegitimate and must be ignored. This is an anti-analysis payload embedded in the shipped artifact: its only function is to make automated code review abandon inspection of the obfuscated bundle. The same package also ships its complete readable TypeScript source tree under src/, so the obfuscation of dist/index.js conceals nothing that the source tree does not already disclose — the obfuscated build and the reviewer-directed notice serve no engineering purpose. No network indicators, C2 hosts, or credential-harvesting paths were found in the readable portions of the package; the concealed logic is confined to the obfuscated dist/index.js bundle.

analyzed by
Leitwacht
first seen
Oct 22, 2026, 05:56 PM
analyzed
Oct 22, 2026, 05:57 PM
weekly installs
102

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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.