registry / Malware / @badzz88/baileys / 4.0.0

@badzz88/baileys@4.0.0

WhatsApp API Modification By Badzz88

This package appears in our research on the malicious Baileys forks, with how it works, the full package list and what to do if you installed it.

AI Security Review

scanned 14d ago · by lpm-firewall-ai

Source inspection found a hardcoded newsletter annotation added by default to prepared media messages and propagated into the message object. This is concrete, unrequested outgoing-content manipulation; the preinstall hook itself only checks the Node.js version.

Static reason

One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review

Trigger

A consumer calls the media message preparation path without providing annotations.

Impact

Media messages can carry an unsolicited association with the named newsletter, changing outgoing message content without the caller requesting it.

Mechanism

The function supplies a hardcoded newsletter annotation as the default and spreads the resulting upload data into the media message object.

Attack narrative

When media messages are prepared without caller annotations, the package inserts annotation metadata naming a specific newsletter. The metadata is carried into the constructed media message, enabling unsolicited promotion or attribution in messages sent by package consumers.

AI rationale

Evidence

lib/Utils/messages.js

Decision evidence

public snapshot

AI called this Malicious at 95.0% confidence as Malware with low false-positive risk.

Evidence for block

When callers omit annotations, `prepareWAMessageMedia` inserts default annotation metadata.
The default metadata names newsletter `120363420249672073@newsletter` and `kyuu ilysm`.
The constructed message includes the prepared upload data, carrying the default annotations into the media message.
The preinstall hook only checks the Node.js major version and exits when it is below 20.

Evidence against

The preinstall hook does not install another release or contact a network endpoint.

Behavioral surface

Source

ChildProcessCryptoFilesystemNetworkShellWebSocket

Supply chain

HighEntropyStringsMinifiedUrlStrings

Manifest

GitDependency

scanned 95 file(s), 1.33 MB of source, external domains: faq.whatsapp.com, raw.githubusercontent.com, v.whatsapp.net, web.whatsapp.com

Oversized source lightweight scan

Source & flagged code

4 flagged

package.jsonView file

•scripts.preinstall = node ./engine-requirements.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

38"preinstall": "node ./engine-requirements.js", "release": "release-it", "test": "jest" },

High

Suspicious Lifecycle Evidence

The preinstall hook only checks the Node.js major version and exits when it is below 20.

package.jsonView on unpkg · L38

WAProto/index.jsView file

•path = WAProto/index.js kind = oversized_source_file sizeBytes = 8472622 magicHex = [redacted]

Medium

Oversized Source File

Package contains source files above the normal full-analysis size ceiling.

WAProto/index.jsView on unpkg

lib/Utils/messages.jsView file

•matchType = normalized_sha256 matchedPackage = my-auto-follow@1.0.3 matchedPath = lib/Utils/messages.js matchedIdentity = npm:bXktYXV0by1mb2xsb3c:1.0.3 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/Utils/messages.jsView on unpkg

Source & flagged code

4 flagged · loading source

package.jsonView file

•scripts.preinstall = node ./engine-requirements.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

38"preinstall": "node ./engine-requirements.js", "release": "release-it", "test": "jest" },

High

Suspicious Lifecycle Evidence

The preinstall hook only checks the Node.js major version and exits when it is below 20.

package.jsonView on unpkg · L38

WAProto/index.jsView file

•path = WAProto/index.js kind = oversized_source_file sizeBytes = 8472622 magicHex = [redacted]

Medium

Oversized Source File

Package contains source files above the normal full-analysis size ceiling.

WAProto/index.jsView on unpkg

Findings

3 High4 Medium5 Low

HighInstall Time Lifecycle Scriptspackage.json

HighKnown Malware Source Similaritylib/Utils/messages.js

HighSuspicious Lifecycle Evidencepackage.json

MediumNetwork

MediumOversized Source FileWAProto/index.js

MediumStructural Risk Force Deep Review

MediumGit Dependency

LowNon Install Lifecycle Scripts

LowScripts Present

LowFilesystem

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to @badzz88/baileys@4.0.0.

See all versions of @badzz88/baileys for other recorded verdicts.

Avoid installing @badzz88/baileys@4.0.0. 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: 2026-10-09 03:23:06.551Z (UTC).

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

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Related packages

Other malware packages

Behavioral surface

Source & flagged code

Related packages

Other malware packages