registry / Malware / chai-as-crack

chai-as-crack

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

This report shows the evidence for chai-as-crack@7.0.5, 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 1mo ago · by lpm-firewall-ai

The package disguises a large obfuscated command-and-network payload behind an inert middleware export and loads it at import time. Although there is no install hook, the reachable runtime behavior is malicious.

Static reason

High-risk behavior combination matched malicious policy.

Trigger

Requiring or importing the package entry point.

Impact

It can execute concealed behavior in the consuming application's process, including command execution and network activity.

Mechanism

Import-time execution of an obfuscated command-and-network payload.

Attack narrative

A consumer imports index.js, which immediately loads lib/config.js. The exported middleware only calls next(), but the imported configuration file is a four-megabyte single-line obfuscated program containing child-process execution and axios primitives. This concealed import-time payload can run in the consumer process without a user action beyond normal package use.

AI rationale

Evidence

index.jslib/config.js

Decision evidence

public snapshot

AI called this Malicious at 94.0% confidence as Malware with low false-positive risk.

Evidence for block

The main module imports the opaque configuration payload during module loading.
The payload is a four-megabyte single-line obfuscated script that imports child-process execution and an HTTP client.
The public export is an inert middleware while the imported payload runs separately, which is consistent with concealed runtime behavior.

Evidence against

The manifest has no preinstall, install, or postinstall hook.
No unobfuscated remote endpoint could be established from the payload source.

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.js3.88 MB file, sampled 256 KB

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

1'use strict'; const path = require('path'); const { spawn } = require('child_process'); const { DEFAULT_LEVELS, SORTING_ORDER } = require('./lib/constants'); const config = require('./lib/config');

High

Ai Review Evidence

The main module imports the opaque configuration payload during module loading.

index.jsView on unpkg · L1

39const middleware = (...args) => { return (_req, _res, next) => { next(); }; };

High

Ai Review Evidence

The public export is an inert middleware while the imported payload runs separately, which is consistent with concealed runtime behavior.

index.jsView on unpkg · L39

lib/config.jsView file

1function mc(F,S,Y,E,i){const F9={F:0x1f1};return T(Y-F9.F,E);}function mk(F,S,Y,E,i){const FM={F:0x3dc};return T(i- -FM.F,F);}function ma(F,S,Y,E,i){const Fu={F:0x109};return j(i-F...

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 mc(F,S,Y,E,i){const F9={F:0x1f1};return T(Y-F9.F,E);}function mk(F,S,Y,E,i){const FM={F:0x3dc};return T(i- -FM.F,F);}function ma(F,S,Y,E,i){const Fu={F:0x109};return j(i-F...

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

package.jsonView file

1{ "name": "chai-as-crack", "version": "7.0.5", "description": "This document describes the management of vulnerabilities for the project and all modules within the organization.", "main": "index.js", "scripts": { "smoke:pino": "node ./index.js", "smoke:file": "node ./file.js"

High

Ai Review Evidence

The payload is a four-megabyte single-line obfuscated script that imports child-process execution and an HTTP client.

package.jsonView on unpkg · L1

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

1'use strict'; const path = require('path'); const { spawn } = require('child_process'); const { DEFAULT_LEVELS, SORTING_ORDER } = require('./lib/constants'); const config = require('./lib/config');

High

Ai Review Evidence

The main module imports the opaque configuration payload during module loading.

index.jsView on unpkg · L1

39const middleware = (...args) => { return (_req, _res, next) => { next(); }; };

High

Ai Review Evidence

The public export is an inert middleware while the imported payload runs separately, which is consistent with concealed runtime behavior.

index.jsView on unpkg · L39

lib/config.jsView file

Findings

2 Critical5 High2 Medium3 Low

CriticalDownload Executelib/config.js

CriticalTrigger Reachable Dangerous Capabilitylib/config.js

HighChild Processindex.js

HighSemantic Analysis Limitedlib/config.js

HighAi Review Evidenceindex.js

HighAi Review Evidencepackage.json

MediumEnvironment Vars

MediumStructural Risk Force Deep Review

LowScripts Present

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to chai-as-crack@7.0.5.

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

Avoid installing chai-as-crack@7.0.5. 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: 2026-09-15 17:10:20.576Z (UTC).

Source advisory published: 2026-09-15 16:32:24.000Z (UTC).

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

Versions

1 known version

7.0.5latestshownMaliciousMalwareBlockPublishedSep 15, 2026, 3:16 PM

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

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Behavioral surface

Source & flagged code

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