MAL-2026-12607
Dashboard / Malicious Package / MAL-2026-12607
MAL-2026-12607
Summary: Malicious code in claims-auth-api-adapters (npm)
Details: Source: amazon-inspector (a214cb0da52b5d7bb026d974fbcd6897b455b8ca000e3ef92c6205678742935e) index.js unconditionally requires./_runtime on module load. _runtime.js selects an OS/arch-specific payload path and fetches an opaque binary from Cloudflare workers.dev hosts whose names are assembled from split string fragments (e.g. oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS TXT fallback that base64-reassembles the payload from sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched binary is written to /tmp with a hidden dot-prefixed name on Unix (.cache_<tag>) or to %TEMP% as dotnet_diag_<tag>.exe on Windows, chmod 0755'd, and spawned detached via /bin/sh -c or cmd.exe. Comments and env-var checks (DO_NOT_TRACK, ANALYTICS_OPT_OUT) and the dotnet_diag/analytics_state filenames present the behavior as telemetry while the split-literal host assembly defeats plain-string scanning. Any process that require()s this package, directly or transitively, causes attacker-controlled code to run on the host.
Affected packages
Package
Name: claims-auth-api-adapters
Purl: pkg:npm/claims-auth-api-adapters
Affected ranges
Type: N/A
Events:
