LWA-2026-10055 MAL-2026-11667 ↗ confirmed malware

@or-sdk/adapters@0.3.8

Malicious code in @or-sdk/adapters (npm)

T1059.007 · JavaScriptT1027 · Obfuscated Files or InformationT1105 · Ingress Tool Transfer

Analysis

The package's preinstall hook (setup.mjs) downloads the Bun runtime from github[.]com/oven-sh/bun/releases and uses it to execute a bundled 727KB obfuscated script (math_init.js) at install time. The script is obfuscated with a large encoded string array and a custom decoder (javascript-obfuscator signature) and contains eval, Function, and child_process usage, concealing its behavior. The package also depends on other packages that are known-malicious. No network C2 endpoint could be extracted from the obfuscated payload.

analyzed by
Leitwacht
first seen
Aug 4, 2026, 11:59 AM
analyzed
Aug 4, 2026, 05:37 PM
weekly installs
363

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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.