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xcvrenzcompany@2.0.0: Malicious npm security report (Block) | LPM Firewall

registry / xcvrenzcompany / 2.0.0

xcvrenzcompany@2.0.0

XcV Company

OSV Malicious Advisory

imported 6d ago · by OpenSSF/OSV

OpenSSF/OSV advisory MAL-2026-17452 confirms this npm version as malicious. This package is a fork of the Baileys WhatsApp Web library (npm) and belongs to the "PhantomSub" family described by OX Security in September 2026: the publisher injected code that, without the installer asking, uses the installer's own authenticated WhatsApp session to subscribe that account to WhatsApp Channels (newsletters) the publisher chose, by sending the WhatsApp `w:mex` FOLLOW query (query_id...

Advisory

MAL-2026-17452

Source

OpenSSF Malicious Packages via OSV

Summary

Malicious code in xcvrenzcompany (npm)

Details

This package is a fork of the Baileys WhatsApp Web library (npm) and belongs to the "PhantomSub" family described by OX Security in September 2026: the publisher injected code that, without the installer asking, uses the installer's own authenticated WhatsApp session to subscribe that account to WhatsApp Channels (newsletters) the publisher chose, by sending the WhatsApp `w:mex` FOLLOW query (query_id 7871414976211147) for each target channel JID. `package/lib/Socket/newsletter.js` lines 62-99 define `AUTO_FOLLOW_JIDS`, three base64 strings decoded with `Buffer.from(..., "base64")`, and when the connection opens (line 97) schedule a FOLLOW query for each, 90 seconds apart (cited line 85: `await newsletterWMexQuery(jid, QueryIds.FOLLOW);`). Decoded JIDs: `120363400505489366@newsletter`, `120363430764800148@newsletter` and `120363387182851100@newsletter`. There is no opt-out and the behavior is not documented. The npm maintainer account (`xzv-expzc`) also publishes `prastzy`. Line numbers refer to version 2.0.0; the same code is present in every published version listed under `affected`. Static review of the published tarball(s) found no code that sends WhatsApp credentials or session keys off-host, no install-time payload (the only install hook is Baileys' stock Node.js version check in `engine-requirements.js`), and no persistence; the payload runs when an application creates a WhatsApp socket with the library. The harm is the covert use of the victim's account to inflate the publisher's channel subscribers. SHA-256 of the published npm tarball(s): 1.0.0: `55a081ebf3ac419742490d3e1b2425ae56cfae323d1f8a64f4758515fbe83bda`; 2.0.0: `2e2befe5201e5a488f4e9253542630805500d210007760f09f9e9bbaac98934a`.

Source & flagged code

8 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

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/GenerateStatics.shView file

•path = WAProto/GenerateStatics.sh kind = build_helper sizeBytes = 302 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

WAProto/GenerateStatics.shView on unpkg

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 = @lekzo/baileys@0.0.6 matchedPath = lib/Utils/messages-media.js matchedIdentity = npm:QGxla3pvL2JhaWxleXM:0.0.6 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

8 flagged

package.jsonView file

Lines 19-59json

19 },

20 "license": "MIT",

21 "author": "Renz - XcV Company",

22 "main": "lib/index.js",

23 "files": [

24 "lib/**/*",

25 "WAProto/**/*",

26 "engine-requirements.js"

27 ],

28 "scripts": {

29 "build:all": "tsc && typedoc",

30 "build:docs": "typedoc",

31 "build:tsc": "tsc",

32 "changelog:last": "conventional-changelog -p angular -r 2",

33 "changelog:preview": "conventional-changelog -p angular -u",

34 "gen:protobuf": "sh WAProto/GenerateStatics.sh",

35 "lint": "eslint src --ext .js,.ts,.jsx,.tsx",

36 "lint:fix": "eslint src --fix --ext .js,.ts,.jsx,.tsx",

37 "prepack": "",

38 "prepare": "",

39 "preinstall": "node ./engine-requirements.js",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L39

40 "release": "release-it",

41 "test": "jest"

42 },

43 "dependencies": {

44 "@cacheable/node-cache": "^1.4.0",

45 "@hapi/boom": "^9.1.3",

46 "async-mutex": "^0.5.0",

47 "libsignal": "^6.0.0",

48 "lru-cache": "^11.1.0",

49 "music-metadata": "^11.12.3",

50 "p-queue": "^9.0.0",

51 "pino": "^9.6",

52 "protobufjs": "^7.5.6",

53 "whatsapp-rust-bridge": "0.5.4",

54 "ws": "^8.13.0",

55 "chalk": "^4.1.2",

56 "cache-manager": "^7.2.8"

57 },

58 "devDependencies": {

59 "@eslint/eslintrc": "^3.3.1",

lib/WABinary/constants.jsView file

Lines 580-620javascript

580 '044',

581 'mms_cat_v1_forward_hot_override_enabled',

582 'user_notice',

583 'ptt_waveform_send',

584 '047',

585 'Asia/Calcutta',

586

lib/Utils/validate-connection.jsView file

Lines 87-127javascript

87 supportBizHostedMsg: true,

88 supportRecentSyncChunkMessageCountTuning: true,

89 supportHostedGroupMsg: true,

90 supportFbidBotChatHistory: true,

91

WAProto/GenerateStatics.shView file

•path = WAProto/GenerateStatics.sh kind = build_helper sizeBytes = 302 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

WAProto/GenerateStatics.shView on unpkg

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 = @lekzo/baileys@0.0.6 matchedPath = lib/Utils/messages-media.js matchedIdentity = npm:QGxla3pvL2JhaWxleXM:0.0.6 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