registry / Credential exfiltration / @ornikar/eslint-config-babel-use
@ornikar/eslint-config-babel-use
eslint babel use
This report shows the evidence for @ornikar/eslint-config-babel-use@13.2.7, the only known version.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiDirect source inspection confirms concrete malicious behavior, not merely suspicious primitives. The preinstall chain is unrelated to the package's stated ESLint-config purpose.
Static reason
One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review; source fingerprint signature matched known malicious package; routed for review
Trigger
npm preinstall
Impact
Remote code execution and theft of GitHub credentials from the install environment.
Mechanism
downloads Bun, executes obfuscated payload, evaluates remote content, and harvests credentials
Attack narrative
On npm preinstall, setup.mjs obtains or invokes Bun and runs math_init.js. That obfuscated payload starts immediately, contains request handling that evaluates server-provided content, and contains logic for GitHub token discovery and outbound requests. This is an unconsented install-time credential-stealing remote execution chain unrelated to an ESLint configuration.
AI rationale
Direct source inspection confirms concrete malicious behavior, not merely suspicious primitives. The preinstall chain is unrelated to the package's stated ESLint-config purpose.
Evidence
package.jsonsetup.mjsmath_init.js/etc/os-releasetemporary Bun download directory
Network endpoints1
github.com/oven-sh/bun/releases/download/bun-v1.3.13/
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- package.json runs `node setup.mjs` as preinstall.
- setup.mjs downloads Bun and executes math_init.js during installation.
- math_init.js is a 728KB obfuscated payload that immediately invokes its main routine.
- math_init.js fetches content and evaluates a returned field with eval.
- Payload enumerates GitHub-token candidates and sends collected data through request logic.
Evidence against
- index.js is a conventional ESLint configuration.
- No benign purpose justifies the hidden preinstall downloader and credential-focused payload.
Behavioral surface
ChildProcessEvalFilesystemNetworkShell
HighEntropyStringsMinifiedUrlStrings
Source & flagged code
4 flagged · loading sourcepackage.jsonView file
•scripts.preinstall = node setup.mjs
High
Install Time Lifecycle Scripts
Package defines install-time lifecycle scripts.
package.jsonView on unpkgmath_init.jsView file
1// @bun @bun-cjs
L2: var MmgoCP,etDiOOB,JqTtnbZ,bc3Kak,ZQmUTyQ,TTUgga,MDX6yrw,h8wMJNB,CabwE2L,x5ErqV;function WV8StW(MmgoCP,etDiOOB,JqTtnbZ){for(JqTtnbZ=0x0;JqTtnbZ<etDiOOB;JqTtnbZ++)MmgoCP.push(MmgoCP...
Low
Eval
Package source references a known benign dynamic code generation pattern.
math_init.jsView on unpkg · L1setup.mjsView file
•matchType = normalized_sha256
matchedPackage = rwc-client@0.29.14
matchedPath = setup.mjs
matchedIdentity = npm:cndjLWNsaWVudA:0.29.14
similarity = 1.000
summary = normalized source hash matched finalized malicious source
Findings
3 High2 Medium5 Low
HighInstall Time Lifecycle Scriptspackage.json
HighKnown Malware Source Similaritysetup.mjs
HighKnown Malware Source Fingerprint Signaturesetup.mjs
MediumNetwork
MediumStructural Risk Force Deep Review
LowScripts Present
LowEvalmath_init.js
LowFilesystem
LowHigh Entropy Strings
LowUrl Strings
Affected versions and remediation
This report applies to @ornikar/eslint-config-babel-use@13.2.7.
The versions list below shows the verdict for each recorded version.
- Avoid installing @ornikar/eslint-config-babel-use@13.2.7. 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: .
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