MAL-2026-12751 Malicious code in devplatform-select-fields (npm)

[email protected] executes a binary dropper on any require() of the package. index.js loads shim.js, which reconstructs C2 hostnames from split string fragments (Cloudflare Workers hosts of the form oob-worker.cf*-*.workers.dev, plus *.dl.wel1.ru), downloads a platform-specific payload over HTTPS, and falls back to a covert DNS TXT channel (reads a count from c.<domain> and reassembles a base64 payload from numbered TXT records). The payload is written to /var/tmp or %TEMP% under cover-story names (.cache<rand>, dotnet_diag_<rand>.exe), chmod 0755'd, and spawned detached via spawn("/bin/sh", ["-c", fp + " &"]) or spawn("cmd",…). No hash or signature verification is performed. A setup() gate honors DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK and writes an.analytics_state cool-down stamp (22583s) to suppress re-execution, framing the dropper as telemetry. Hostname string-splitting and the DNS-TXT reassembly path are anti-analysis measures. The package name resembles unrelated legitimate packages but the shipped code performs no advertised functionality.

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.