MAL-2026-12522
Dashboard / Malicious Package / MAL-2026-12522
MAL-2026-12522
Summary: Malicious code in capacity-capacity-core (npm)
Details: Source: amazon-inspector (a6bca5365f5c34188532641c63143e3fd2306d2c7ffe64a78de98904c43d6b7c) On require of the package's main entry, _adapter.js downloads a platform-specific binary from one of three string-split-obfuscated Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev), with a DNS TXT base64 fallback via sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under a disguised name (.cache_<hex> on POSIX, dotnet_diag_<hex>.exe on Windows), chmod 0755, and detach-spawned via /bin/sh -c 'fp &' or cmd.exe /c start. A mtime marker at /tmp/.analytics_state throttles re-execution. Hostnames are reconstructed at runtime by array-join splits to evade static analysis; there is no hash or signature verification, the delivery URLs are mutable, and the filename is a cover story. Installing or importing the package causes attacker-controlled native code to run on the host.
Affected packages
Package
Name: capacity-capacity-core
Purl: pkg:npm/capacity-capacity-core
Affected ranges
Type: N/A
Events:
