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Malicious package

devplatform-spa-plugin-abilitynpm

Advisory published Updated

devplatform-spa-plugin-ability is a confirmed malicious npm package (MAL-2026-12759) that executes malicious code on install (malicious version 35.5.2). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in devplatform-spa-plugin-ability (npm)

MAL-2026-12759
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall devplatform-spa-plugin-ability

What this malware does

On require of the package, index.js loads bootstrap.js which downloads a platform-specific native binary from anonymous Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-TXT covert-channel fallback under *.dl.wel1.ru (chunk count in c.<domain>, N shards concatenated and base64-decoded into an executable buffer). Hostnames are assembled at runtime by joining split string fragments (e.g. ["oob-worker.cf102-baf.worke","rs.d","ev"].join("")). The fetched binary is written to disguised paths (/var/tmp/.cache<hex>, %TEMP%\dotnet_diag_<hex>.exe, /pkg/package.exe|-arm64|loader_mac), chmod 0755, and spawned detached via /bin/sh -c or cmd /c start with no hash or signature verification. A lib/telemetry.js decoy file and an.analytics_state rate-limit stamp plus DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK env-var gates provide cover-story framing; the delivered payload is unrelated to the package's stated purpose (an "SPA plugin ability SDK"). Installing or requiring this package executes attacker-controlled code on the installer host.

Malicious versions

1 flagged
35.5.2

Indicators of compromise (SHA-256)

c9753b327ec0ed7c7cf204951dd0c1db47db31c79fde8ffad042e8658bb0dc81

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for devplatform-spa-plugin-ability (version 35.5.2).

  2. If you installed it — respond

    Remove devplatform-spa-plugin-ability from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

  3. Did it already run?

    If devplatform-spa-plugin-ability was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. devplatform-spa-plugin-ability on npm has been identified as a malicious package (version 35.5.2 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015012

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks devplatform-spa-plugin-ability-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

Explore

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devplatform-spa-plugin-ability (npm) malicious package — MAL-2026-12759 | O3 Security