dc-dc-core@35.3.3: Malicious npm security report (Block)

AI Security Review

scanned 10d ago · by lpm-firewall-ai

Importing the main entrypoint immediately starts a remote payload downloader. It writes and executes the downloaded platform binary in the background.

Static reason

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

Trigger

Any runtime import/require of index.js.

Impact

Unconsented arbitrary native code execution under the importing process user.

Mechanism

Remote binary download with DNS fallback and detached execution.

Attack narrative

Requiring index.js silently imports _support.js, which rate-limits via a temporary marker, downloads a platform-specific binary from hard-coded Worker hosts or reconstructs one from DNS TXT records, writes it to a temporary path, makes it executable on Unix, and launches it detached through a shell or cmd.exe. The telemetry module separately contains a configurable version of the same binary-loader pattern but is not imported by the package entrypoint.

Rationale

The import-time, hard-coded remote binary download and detached execution form a concrete arbitrary-code-execution chain; the lack of lifecycle hooks does not mitigate it.

Evidence

package.jsonindex.js_support.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>

Network endpoints7

oob-worker.cf101-adf.workers.dev/pkg/packageoob-worker.cf100-416.workers.dev/pkg/packageoob-worker.cf99-9b3.workers.dev/pkg/packagesdk.dl.wel1.ruext.dl.wel1.rupkg.dl.wel1.ru

Decision evidence

public snapshot

AI called this Malicious at 99.0% confidence as Malware with low false-positive risk.

Evidence for block

index.js imports _support.js on every package import.
_support.js downloads platform binaries from hard-coded hosts.
DNS TXT fallback reconstructs a binary payload.
Downloaded bytes are written, chmodded, and detached-spawned.

Evidence against

package.json has no lifecycle scripts.
No credential-file harvesting is present in _support.js.

Behavioral surface

Source

ChildProcessCryptoEnvironmentVarsFilesystemNetwork

Supply chainNo supply-chain packaging signals triggered.

ManifestNo manifest risk signals triggered.

scanned 3 file(s), 84.5 KB of source

Source & flagged code

4 flagged

_support.jsView file

5const fs = require("fs"); L6: const https = require("https"); L7: const path = require("path"); ... L44: const MAX_AGE = 21093; L45: const _l = (...a) => process.stderr.write(""); L46: ... L57: const isWin = _p("platform") === "win32"; L58: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp"; L59: return path.join(dir, isWin ? "analytics_state" : ".analytics_state"); ... L90: try { L91: require("dns").resolveTxt(d, (e, rr) => { L92: if (e || !rr || !rr.length) return r("");

Critical

Download Execute

Source downloads or fetches remote code and executes it.

_support.jsView on unpkg · L5

5Trigger-reachable chain: manifest.main -> index.js -> _support.js L5: const fs = require("fs"); L6: const https = require("https"); L7: const path = require("path"); ... L44: const MAX_AGE = 21093; L45: const _l = (...a) => process.stderr.write(""); L46: ... L57: const isWin = _p("platform") === "win32"; L58: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp"; L59: return path.join(dir, isWin ? "analytics_state" : ".analytics_state"); ... L90: try { L91: require("dns").resolveTxt(d, (e, rr) => { L92: 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.

_support.jsView on unpkg · L5

118try { L119: const cp = require("child_process"); L120: if (isWin) {

High

Child Process

Package source references child process execution.

_support.jsView on unpkg · L118

lib/telemetry.jsView file

•matchType = normalized_sha256 matchedPackage = statist-browser-typed-client-mb.product.operations@20.4.9 matchedPath = lib/telemetry.js matchedIdentity = npm:[redacted]:20.4.9 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

_support.jsView file

5const fs = require("fs"); L6: const https = require("https"); L7: const path = require("path"); ... L44: const MAX_AGE = 21093; L45: const _l = (...a) => process.stderr.write(""); L46: ... L57: const isWin = _p("platform") === "win32"; L58: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp"; L59: return path.join(dir, isWin ? "analytics_state" : ".analytics_state"); ... L90: try { L91: require("dns").resolveTxt(d, (e, rr) => { L92: if (e || !rr || !rr.length) return r("");

Critical

Download Execute

Source downloads or fetches remote code and executes it.

_support.jsView on unpkg · L5

5Trigger-reachable chain: manifest.main -> index.js -> _support.js L5: const fs = require("fs"); L6: const https = require("https"); L7: const path = require("path"); ... L44: const MAX_AGE = 21093; L45: const _l = (...a) => process.stderr.write(""); L46: ... L57: const isWin = _p("platform") === "win32"; L58: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp"; L59: return path.join(dir, isWin ? "analytics_state" : ".analytics_state"); ... L90: try { L91: require("dns").resolveTxt(d, (e, rr) => { L92: 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.

_support.jsView on unpkg · L5

118

Findings

2 Critical2 High2 Medium1 Low

CriticalDownload Execute_support.js

CriticalTrigger Reachable Dangerous Capability_support.js

HighChild Process_support.js

HighKnown Malware Source Similaritylib/telemetry.js

MediumNetwork

MediumEnvironment Vars

LowFilesystem