registry / Malware / @mikudeveloper/baileys

@mikudeveloper/baileys

WhatsApp API Modification By Miku Developer

This report shows the evidence for @mikudeveloper/baileys@1.0.0. 1 of 2 known versions is blocked or flagged. The newest version, 0.0.1-security, is allowed. See all versions.

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 1mo ago · by lpm-firewall-ai

The default socket path includes a hidden delayed fetch of a maintainer-controlled channel list and an automatic follow loop against the user's WhatsApp session. That is unconsented account abuse, not ordinary newsletter helper APIs.

Static reason

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

Trigger

Import or call the default makeWASocket entry and keep the process running for at least two minutes.

Impact

The logged-in WhatsApp account can be made to follow attacker-chosen channels without the app or user asking for that.

Mechanism

Hidden delayed remote channel-follow loop

Attack narrative

An app that uses this Baileys fork creates the default WhatsApp socket. That path also builds the newsletter layer. Two minutes later a hidden timer downloads a JSON list of channel IDs from a GitHub repo the maintainer controls, then walks the list and tries to follow each channel with the user's logged-in session. Failures are ignored and follows are staggered, so the host app is unlikely to notice. The remote list can change after install, which lets the maintainer retarget which channels get followed.

AI rationale

Evidence

lib/Socket/newsletter.jslib/Socket/username.jslib/Socket/messages-send.jslib/Socket/index.jslib/index.js

Network endpoints1

raw.githubusercontent.com/MikuDevReal/V2.0/refs/heads/main/pepek.json

Decision evidence

public snapshot

AI called this Malicious at 90.0% confidence as Malware with low false-positive risk.

Evidence for block

Creating the default WhatsApp socket starts a hidden two-minute timer that downloads a remote JSON channel list from GitHub and tries to follow each ID on the user's session.
Follow attempts swallow errors and wait 11 seconds between IDs, which hides the behavior from the host app.
The newsletter layer is on the default makeWASocket import path, so ordinary socket use activates it.
The GitHub file is maintainer-controlled and can change after publish, so the follow targets are not fixed in the package.

Evidence against

preinstall only checks that Node.js is 20 or newer and then exits.
The follow call uses undefined Types_1.QueryIds.FOLLOW, so the WhatsApp follow query may throw before it is sent.
Scanner hits on protocol string tables, ffmpeg thumbnails, and a git libsignal dependency match a normal Baileys-style WhatsApp library.

Behavioral surface

Source

ChildProcessCryptoFilesystemNetworkShellWebSocket

Source & flagged code

7 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

lib/WABinary/constants.jsView file

600patternName = google_api_key severity = high line = 600

High

High Secret

Package contains a high-severity secret pattern.

lib/WABinary/constants.jsView on unpkg · L600

600patternName = google_api_key severity = high line = 600

High

Secret Pattern

Google API key in lib/WABinary/constants.js

lib/WABinary/constants.jsView on unpkg · L600

lib/Utils/validate-connection.jsView file

107pull: false, L108: devicePairingData: { L109: buildHash: appVersionBuf, ... L134: const { details, hmac, accountType } = proto.ADVSignedDeviceIdentityHMAC.decode(deviceIdentityNode.content); L135: let hmacPrefix = Buffer.from([]); L136: if (accountType !== undefined && accountType === proto.ADVEncryptionType.HOSTED) { ... L158: ]); L159: account.deviceSignature = Curve.sign(signedIdentityKey.private, deviceMsg); L160: const identity = createSignalIdentity(lid, accountSignatureKey);

Low

Weak Crypto

Package source references weak cryptographic algorithms.

lib/Utils/validate-connection.jsView on unpkg · L107

WAProto/index.jsView file

•path = WAProto/index.js kind = oversized_source_file sizeBytes = 12145764 magicHex = [redacted]

Medium

Oversized Source File

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

WAProto/index.jsView on unpkg

lib/Utils/business.jsView file

•stage = ast_semantic_analysis; reason = ast_alias_growth_limit_exceeded; limitedFiles = 3

High

Semantic Analysis Limited

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

lib/Utils/business.jsView on unpkg

lib/Utils/messages-media.jsView file

•matchType = normalized_sha256 matchedPackage = xzvbails@0.0.1 matchedPath = lib/Utils/messages-media.js matchedIdentity = npm:eHp2YmFpbHM:0.0.1 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-media.jsView on unpkg

Source & flagged code

7 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

lib/WABinary/constants.jsView file

600patternName = google_api_key severity = high line = 600

High

High Secret

Package contains a high-severity secret pattern.

lib/WABinary/constants.jsView on unpkg · L600

600patternName = google_api_key severity = high line = 600

High

Secret Pattern

Google API key in lib/WABinary/constants.js

lib/WABinary/constants.jsView on unpkg · L600

Findings

5 High4 Medium6 Low

HighInstall Time Lifecycle Scriptspackage.json

HighHigh Secretlib/WABinary/constants.js

HighSemantic Analysis Limitedlib/Utils/business.js

HighKnown Malware Source Similaritylib/Utils/messages-media.js

HighSecret Patternlib/WABinary/constants.js

MediumNetwork

MediumOversized Source FileWAProto/index.js

MediumStructural Risk Force Deep Review

MediumGit Dependency

LowNon Install Lifecycle Scripts

LowScripts Present

LowWeak Cryptolib/Utils/validate-connection.js

LowFilesystem

LowHigh Entropy Strings

Low

Affected versions and remediation

This report applies to @mikudeveloper/baileys@1.0.0.

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

Avoid installing @mikudeveloper/baileys@1.0.0. 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: 2026-10-12 15:45:06.266Z (UTC).

Source advisory published: 2026-09-22 16:05:11.000Z (UTC).

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

Versions

2 known versions

0.0.1-securitylatestUnknown—AllowUnder ReviewOct 12, 2026, 3:25 PM 1.0.0shownMaliciousMalwareBlockPublishedSep 18, 2026, 3:25 PM

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

More from @mikudeveloper

Other malware packages

Runtime surface

Behavioral surface

Related packages

More from @mikudeveloper

Other malware packages

Source & flagged code