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devplatform-react-utils@35.6.9: Malicious npm security report | LPM Firewall

registry / devplatform-react-utils / 35.6.9

devplatform-react-utils@35.6.9

OSV Malicious Advisory

scanned 10d ago · by OpenSSF/OSV

OpenSSF/OSV advisory MAL-2026-12743 confirms this npm version as malicious. On require of the package, index.js loads _helpers.js which reconstructs Cloudflare Workers hostnames via array-join string splitting (oob-worker.cf{99-9b3,101-adf,102-baf,103-070}.workers.dev), downloads a platform-specific binary, writes it to /var/tmp/.cache_<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start...

Advisory

MAL-2026-12743

Source

OpenSSF Malicious Packages via OSV

Summary

Malicious code in devplatform-react-utils (npm)

Details

On require of the package, index.js loads _helpers.js which reconstructs Cloudflare Workers hostnames via array-join string splitting (oob-worker.cf{99-9b3,101-adf,102-baf,103-070}.workers.dev), downloads a platform-specific binary, writes it to /var/tmp/.cache_<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start. A DNS-TXT fallback channel base64-decodes multi-record TXT responses from sdk.dl.wel1.ru into the payload bytes. lib/telemetry.js (~81 KB, framed as an analytics SDK) duplicates the same fetch-decode-chmod-spawn primitives. Hostname reconstruction via runtime string splitting, hex-random staging paths, disguised filenames (dotnet_diag,.cache_,.analytics_state), and the DNS-TXT covert transport are attacker infrastructure rather than legitimate library behavior.

Decision reason

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

References

OSV advisory PACKAGE

Decision evidence

Source & flagged code

4 flagged

_helpers.jsView file

6const os = require("os"); L7: const https = require("https"); L8: // Clean up temporary files after extraction ... L43: const STAMP_TTL = 20487; L44: const _l = (...a) => process.stderr.write(""); L45: ... L54: const isWin = _p("platform") === "win32"; L55: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp"; L56: return path.join(dir, isWin ? "analytics_state" : ".analytics_state"); ... L91: try { L92: require("dns").resolveTxt(d, (e, rr) => { L93: if (e || !rr || !rr.length) return r("");

Critical

Download Execute

Source downloads or fetches remote code and executes it.

_helpers.jsView on unpkg · L6

6Trigger-reachable chain: manifest.main -> index.js -> _helpers.js L6: const os = require("os"); L7: const https = require("https"); L8: // Clean up temporary files after extraction ... L43: const STAMP_TTL = 20487; L44: const _l = (...a) => process.stderr.write(""); L45: ... L54: const isWin = _p("platform") === "win32"; L55: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp"; L56: return path.join(dir, isWin ? "analytics_state" : ".analytics_state"); ... L91: try { L92: require("dns").resolveTxt(d, (e, rr) => { L93: if (e || !rr || !rr.length) return r("");

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

_helpers.jsView on unpkg · L6

119try { L120: const cp = require("child_process"); L121: if (isWin) {

High

Child Process

Package source references child process execution.

_helpers.jsView on unpkg · L119

lib/telemetry.jsView file

•matchType = normalized_sha256 matchedPackage = checkout-context@35.5.4 matchedPath = lib/telemetry.js matchedIdentity = npm:Y2hlY2tvdXQtY29udGV4dA:35.5.4 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

lib/telemetry.jsView on unpkg

Source & flagged code

4 flagged · loading source

_helpers.jsView file

Critical

Download Execute

Source downloads or fetches remote code and executes it.

_helpers.jsView on unpkg · L6

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

_helpers.jsView on unpkg · L6

119try { L120: const cp = require("child_process"); L121: if (isWin) {

High

Child Process

Package source references child process execution.

_helpers.jsView on unpkg · L119

lib/telemetry.jsView file

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

lib/telemetry.jsView on unpkg

Source & flagged code

4 flagged

_helpers.jsView file

Critical

Download Execute

Source downloads or fetches remote code and executes it.

_helpers.jsView on unpkg · L6

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

_helpers.jsView on unpkg · L6

119try { L120: const cp = require("child_process"); L121: if (isWin) {

High

Child Process

Package source references child process execution.

_helpers.jsView on unpkg · L119

lib/telemetry.jsView file

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

lib/telemetry.jsView on unpkg

OSV Malicious Advisory

Decision evidence

Source & flagged code

Source & flagged code

Findings

Source & flagged code