registry / Malware / chai-as-fusion

chai-as-fusion

This document describes the management of vulnerabilities for the project and all modules within the organization.

This report shows the evidence for chai-as-fusion@2.3.6, the only known version.

This package appears in our research on the fake chai plugin campaign, with how it works, the full package list and what to do if you installed it.

AI Security Review

scanned 26d ago · by lpm-firewall-ai

The import-triggered, heavily obfuscated command execution and outbound request are concrete malicious behavior. Absence of an install hook does not remove the runtime attack surface.

Static reason

High-risk behavior combination matched malicious policy.

Trigger

Importing the package main entrypoint.

Impact

The package can run concealed commands and transmit data during ordinary application import.

Mechanism

index.js requires lib/config.js, whose top-level obfuscated code invokes execSync and Axios.

Attack narrative

A consumer importing the declared main module automatically loads lib/config.js. Its opaque top-level code accesses command-execution primitives, invokes execSync with decoded content, and posts a constructed data object through Axios. The command and destination are deliberately concealed, preventing a legitimate package-aligned explanation and creating a concrete concealed execution and outbound-data path.

AI rationale

The import-triggered, heavily obfuscated command execution and outbound request are concrete malicious behavior. Absence of an install hook does not remove the runtime attack surface.

Evidence

index.jslib/config.js

Decision evidence

public snapshot

AI called this Malicious at 96.0% confidence as Malware with low false-positive risk.

Evidence for block

The package declares index.js as its main entrypoint.
Importing the main entrypoint loads lib/config.js.
The loaded configuration file is heavily obfuscated and invokes decoded commands through execSync.
The same file sends a constructed data object through Axios with custom headers.

Evidence against

No npm preinstall, install, or postinstall hook is declared.

Behavioral surface

Source

ChildProcessEnvironmentVars

Supply chain

HighEntropyStringsMinifiedUrlStrings

ManifestNo manifest risk signals triggered.

scanned 15 file(s), 307 KB of source, external domains: github.com

Oversized source lightweight scan

lib/config.js4.29 MB file, sampled 256 KB

HighEntropyStringsMinified

Source & flagged code

7 flagged

index.jsView file

3const path = require('path'); L4: const { spawn } = require('child_process'); L5: const { DEFAULT_LEVELS, SORTING_ORDER } = require('./lib/constants');

High

Child Process

Package source references child process execution.

index.jsView on unpkg · L3

5const { DEFAULT_LEVELS, SORTING_ORDER } = require('./lib/constants'); const config = require('./lib/config'); const { pid } = pr

High

Ai Review Evidence

Importing the main entrypoint loads lib/config.js.

index.jsView on unpkg · L5

lib/config.jsView file

1function K(){const aq=['\x57\x52\x64\x63\x53\x6d\x6b\x59\x57\x37\x37\x63\x50\x61','\x57\x52\x56\x63\x50\x6d\x6b\x51\x57\x50\x68\x63\x4d\x47','\x57\x34\x37\x63\x4f\x53\x6f\x30\x57\x...

Critical

Download Execute

Source downloads or fetches remote code and executes it.

lib/config.jsView on unpkg · L1

1Trigger-reachable chain: manifest.main -> index.js -> lib/config.js L1: function K(){const aq=['\x57\x52\x64\x63\x53\x6d\x6b\x59\x57\x37\x37\x63\x50\x61','\x57\x52\x56\x63\x50\x6d\x6b\x51\x57\x50\x68\x63\x4d\x47','\x57\x34\x37\x63\x4f\x53\x6f\x30\x57\x...

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

lib/config.jsView on unpkg · L1

•stage = ast_semantic_analysis; reason = ast_path_work_budget_exceeded; limitedFiles = 1

High

Semantic Analysis Limited

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

lib/config.jsView on unpkg

•path = lib/config.js kind = oversized_source_file sizeBytes = 4498414 magicHex = [redacted]

Medium

Oversized Source File

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

lib/config.jsView on unpkg

package.jsonView file

5"main": "index.js", "scripts": { "smoke:pino": "node ./index.js", "smoke:file": "node ./file.js" }, "keywords": [ "fast", "logger",

High

Ai Review Evidence

The package declares index.js as its main entrypoint.

package.jsonView on unpkg · L5

Source & flagged code

7 flagged · loading source

index.jsView file

3const path = require('path'); L4: const { spawn } = require('child_process'); L5: const { DEFAULT_LEVELS, SORTING_ORDER } = require('./lib/constants');

High

Child Process

Package source references child process execution.

index.jsView on unpkg · L3

5const { DEFAULT_LEVELS, SORTING_ORDER } = require('./lib/constants'); const config = require('./lib/config'); const { pid } = pr

High

Ai Review Evidence

Importing the main entrypoint loads lib/config.js.

index.jsView on unpkg · L5

lib/config.jsView file

1function K(){const aq=['\x57\x52\x64\x63\x53\x6d\x6b\x59\x57\x37\x37\x63\x50\x61','\x57\x52\x56\x63\x50\x6d\x6b\x51\x57\x50\x68\x63\x4d\x47','\x57\x34\x37\x63\x4f\x53\x6f\x30\x57\x...

Critical

Download Execute

Source downloads or fetches remote code and executes it.

lib/config.jsView on unpkg · L1

Findings

2 Critical4 High3 Medium3 Low

CriticalDownload Executelib/config.js

CriticalTrigger Reachable Dangerous Capabilitylib/config.js

HighChild Processindex.js

HighSemantic Analysis Limitedlib/config.js

HighAi Review Evidencepackage.json

HighAi Review Evidenceindex.js

MediumEnvironment Vars

MediumOversized Source Filelib/config.js

MediumStructural Risk Force Deep Review

LowScripts Present

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to chai-as-fusion@2.3.6.

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

Avoid installing chai-as-fusion@2.3.6. 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: 2026-09-27 08:23:52.342Z (UTC).

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

Versions

1 known version

2.3.6latestshownMaliciousMalwareBlockPublishedSep 26, 2026, 4:51 AM

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other malware packages

Behavioral surface

Related packages

Other malware packages

Source & flagged code