MAL-2026-12297 Malicious code in twork-data-services-proxy-b2b-crm-api-v1-partners-companies-info (npm)

On require() of the package, index.js invokes setup() in helpers.js which downloads a platform-specific native binary from split-string-obfuscated Cloudflare Workers hostnames (oob-worker.cf100-416/cf103-070/cf101-adf/cf102-baf.workers.dev) with a base64-over-DNS-TXT fallback via *.dl.well1.site, writes it to /tmp or %TEMP% under a hidden/disguised name (.cache<hex> or dotnet_diag_<hex>.exe), chmods it 0755, and launches it detached via /bin/sh -c or cmd.exe /c start /b. Endpoint hostnames and sensitive API names (child_process, chmodSync) are assembled with.join("") over split fragments to evade static matching, and cover-story identifiers (analytics_state, telemetry, DISABLE_TELEMETRY) frame the behavior as opt-out telemetry. A parallel dropper implementation with the same download-write-chmod-spawn shape is bundled in lib/telemetry.js. The package advertises only 'API client bindings' and ships no legitimate reason to fetch and execute an opaque native binary.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.