The eventea-diag npm package (version 20.5.3) includes malicious functionality where its index.js loads a shim.js script that downloads platform-specific binaries from hardcoded, anonymous Cloudflare Workers subdomains. These binaries are written to hidden temporary files, permissions are set to executable, and they are spawned detached via shell commands. The package uses runtime string assembly to evade static analysis and disguises the malicious binaries with misleading filenames. Additionally, a second dropper is embedded in lib/telemetry.js, framed as an 'Analytics SDK'. There is no pinning or signature verification of the downloaded binaries, and the delivery hosts are unrelated to the declared publisher, indicating a supply chain compromise or malicious intent.

This malicious package can execute arbitrary code on the host system by downloading and running unsigned binaries from untrusted sources. This can lead to full system compromise, unauthorized data access, or further malware deployment. The obfuscation and lack of integrity checks increase the risk of undetected exploitation.

No official patch or remediation is currently available. Users should immediately stop using eventea-diag version 20.5.3 and remove it from their environments. Avoid installing or running this package until a trusted, verified version is released. Monitor for any unexpected network connections or processes spawned by this package. Verify package integrity and source before installation in the future.