MAL-2026-4267 Malicious code in @newline53/newline-ts-sdk (npm)

On npm install, the postinstall hook (node install.js) collects os.hostname() and os.userInfo().username along with the package name, encodes them as a DNS subdomain of mjcfux88wjjahplabxdauc6bl.canarytokens.com, and beacons out via DNS resolution (dns.lookup/dns.resolve) and HTTP requests (shelled curl/wget to http://<host-username-pkg>.mjcfux88wjjahplabxdauc6bl.canarytokens.com). The package has no real functionality — index.js is module.exports = {} — and package.json carries placeholder author metadata (a 32-char hex string with no homepage or repository). The structure (empty main, recon-only postinstall, canarytoken endpoint) is the canonical dependency-confusion probe: an attacker publishes a public npm package matching an internal scope name to detect whether private builds inside a target organization resolve to and install the public name. The exfiltrated hostname/username identifies the victim environment to the attacker.

The OpenSSF Package Analysis project identified '@newline53/newline-ts-sdk' @ 1.0.1 (npm) as malicious.

It is considered malicious because:

• The package communicates with a domain associated with malicious activity.

• The package executes one or more commands associated with malicious behavior.