MAL-2026-12291 Malicious code in twork-data-services-eacq-company-service-v2-api-v1-identifiers-crm (npm)

index.js unconditionally requires setup.js on module load. setup.js reconstructs C2 hostnames at runtime from split string fragments (resolving to oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, with a DNS-TXT fallback channel under *.dl.well1.site), downloads a platform-specific binary, writes it to a temp path with a masquerading filename (.cache_<hex>, dotnet_diag_<hex>.exe), chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe with no hash or signature verification. The package's advertised purpose does not require any native binary. Environment variables such as DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, and DO_NOT_TRACK are checked to skip execution, consistent with sandbox/analyst evasion. A sibling module lib/telemetry.js, not currently reached from the entrypoint, ships the same spawn(/bin/sh) + chmodSync 0755 + base64-buffer decode pattern with split 'child_'+'process' require, indicating a staged alternate dropper bundled with the package.

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.