MAL-2026-12895 Malicious code in bnpl-blocks-atom-bnpl-star-rating (npm)

On require of the package's main entry, index.js loads shim.js which fetches a platform-specific binary payload (dotnet_diag<rand>.exe on Windows, loader_mac /.cache_<rand> on POSIX) from hardcoded Cloudflare Workers hosts, writes it to a temp path, chmods 0755, and spawns it detached via child_process.spawn with unref(). When HTTPS mirrors fail, the loader falls back to a DNS TXT retrieval channel against *.dl.wel1.ru, reading a chunk count from c.<domain> and reassembling sequential N.<domain> TXT records as a base64-encoded payload. C2 hostnames and fallback resolver domains are reconstructed at runtime by.join('') of split-string arrays to defeat static searching, and execution is gated by env-var kill switches (DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, DO_NOT_TRACK) and a /tmp/.analytics_state stamp file for once-per-TTL suppression. The package's declared purpose is a 'star rating abstraction layer,' which does not require fetching or executing an opaque cross-platform binary at load time. The delivered binary runs with the installer's privileges and provides full-host code execution.