registry / devplatform-spa-plugin-s3-feature-toggle / 35.7.1

devplatform-spa-plugin-s3-feature-toggle@35.7.1

Devplatform spa plugin s3 feature toggle abstraction layer

AI Security Review

scanned 10d ago · by lpm-firewall-ai

Importing the package triggers a hidden remote payload bootstrap. It downloads or DNS-reconstructs an executable, drops it into a temp directory, and runs it detached.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review

Trigger

Any require/import of the package main entrypoint.

Impact

Arbitrary attacker-controlled code can execute as the importing user.

Mechanism

import-time remote binary download, drop, and detached execution

Attack narrative

The main entrypoint silently imports _runtime.js. Its immediately invoked bootstrap selects a platform payload URL, downloads bytes from concealed Workers hosts or reconstructs them through DNS TXT records, writes the bytes to a temporary executable-named file, makes Unix files executable, and launches them detached via a shell or cmd.exe. This occurs on ordinary package import without user configuration.

Rationale

This is a concrete, hidden import-time remote-code-execution chain unrelated to the advertised feature-toggle API. No install hook is required for the payload to execute once the package is loaded.

Evidence

package.jsonindex.js_runtime.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_stateC:\Windows\Temp\dotnet_diag_<random>.exe

Network endpoints7

On require() of the package, index.js loads _runtime.js which selects a platform-specific endpoint, downloads a binary over HTTPS from obfuscated Cloudflare Workers subdomains (oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev), writes it to /var/tmp/.cache_<hex> on POSIX or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmods 0755, and spawns it detached via /bin/sh -c or cmd. Destination hostnames are reconstructed by array-join to defeat static string scanning (e.g. ["oob-work","er.cf1","03-070.w","orke","rs",".d","ev"].join("")). When HTTPS delivery fails, _runtime.js falls back to a DNS-tunneled channel over TXT records at sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru: it queries c.<domain> for a chunk count, iterates <i>.<domain> to retrieve base64-encoded chunks, concatenates and decodes them into a Buffer, writes the resulting binary to disk, chmods 0755, and spawns it. No hash or signature verification is performed; the payload is opaque and delivered from anonymous infrastructure; staging paths use hidden dot-file and dotnet_diag cover names; env-var opt-out gates (DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, DO_NOT_TRACK) and analytics-themed comments frame the behavior as telemetry. The combination of import-time execution, obfuscated attacker-controlled hosts, DNS-TXT covert-channel fallback, and unverified native-binary execution gives full remote code execution on the installer's host on npm install / require().

devplatform-spa-plugin-s3-feature-toggle@35.7.1

AI Security Review

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