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KO

MAL-2026-10157

Malicious code in notify-theme (npm)

Details

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## Source: amazon-inspector (d9cbb2ac45124e3844e29f3efd70ca26f0089ec4eaad718bcbdaf3035ec9b34b) The package impersonates the pino logger API (exports `module.exports.pino = middleware`, ships pino-style files such as lib/proto.js, lib/multistream.js, lib/transport.js, and declares logger-oriented keywords) while its actual behavior is a remote-code dropper. When a consumer imports and invokes the exported middleware, index.js spawns a detached Node child running lib/caller.js, which HTTP-GETs https://jsonkeeper.com/b/K80JD and passes the response body to `new Function.constructor('require', s)`, then invokes it with the host process's `require` — granting the remote endpoint arbitrary code execution inside the installer's Node process with full module access. lib/caller.js disguises the destination by shadowing `process` with a local object whose `env` fields (API_KEY, SECRET_KEY, SECRET_VALUE) actually hold the C2 URL and header pair. lib/const.js contains a base64-encoded backup endpoint that decodes to https://jsonkeeper.com/b/ZK45J. jsonkeeper.com is an anonymous, author-mutable paste host, so the executed payload can change at any time without a package update. The pino-API impersonation on an unrelated package name (`notify-theme`) is a lure so that developers looking for a logger trigger the dropper.

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Affected packages

npm / notify-theme

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References