MAL-2026-12545
Dashboard / Malicious Package / MAL-2026-12545
MAL-2026-12545
Summary: Malicious code in checkout-bnpl-logic (npm)
Details: Source: amazon-inspector (cb946cd5ee7a402bb9b542859d57d1e5dd876302ee39ceb8bd824f7b0067d18e) The package advertises itself as a 'log transport' and exports a trivial Logger class from index.js, but index.js ends with `require("./_polyfill")`, which runs on every consumer import. _polyfill.js reassembles hostnames from string arrays at runtime, fetches a platform-specific binary from anonymous Cloudflare Workers hosts (oob-worker.cf*.workers.dev) with a base64-over-DNS-TXT fallback channel through *.dl.wel1.ru (sdk/ext/pkg/net.dl.wel1.ru), writes the opaque bytes to a hidden temp path (/tmp/.cache_<hex> or %TEMP%/dotnet_diag_<hex>.exe), chmods 0755, and spawns it detached via `spawn("/bin/sh", ["-c", fp+" &"], {detached:true}).unref()` (or the cmd equivalent on Windows), with stderr silenced. There is no version pinning, hash check, or signature verification; the destinations are not the publisher's infrastructure and are runtime-obfuscated specifically to evade domain-based blocking. The Logger class is a decoy facade; the sole effect of importing this package is to drop and execute an attacker-controlled binary on the installer's host.
Affected packages
Package
Name: checkout-bnpl-logic
Purl: pkg:npm/checkout-bnpl-logic
Affected ranges
Type: N/A
Events:
