registry / Remote code execution / @ornikar/eslint-config-formatjs
@ornikar/eslint-config-formatjs
eslint formatjs config files
This report shows the evidence for @ornikar/eslint-config-formatjs@24.0.5. 10 of 10 known versions are blocked or flagged. The newest version, 24.0.10, is blocked. See all versions.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiThe package’s declared ESLint configuration is small, but its mandatory preinstall executes an unrelated obfuscated payload with dynamic eval and credential-focused behavior. This is concrete install-time malicious behavior.
Static reason
One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review
Trigger
npm install (preinstall)
Impact
Arbitrary code execution and potential credential exfiltration on the installing machine.
Mechanism
installer-launched obfuscated remote-code payload
Attack narrative
Installing the package invokes setup.mjs. It runs an existing Bun or downloads a Bun binary, then uses it to execute the large obfuscated math_init.js payload. That payload dynamically fetches and evals content and contains GitHub-token-oriented handling, creating an install-time remote code execution and credential-theft chain unrelated to ESLint configuration.
AI rationale
The package’s declared ESLint configuration is small, but its mandatory preinstall executes an unrelated obfuscated payload with dynamic eval and credential-focused behavior. This is concrete install-time malicious behavior.
Evidence
package.jsonsetup.mjsmath_init.jsindex.jsplugins/formatjs.js
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` in preinstall.
- setup.mjs downloads Bun from GitHub and executes math_init.js during install.
- math_init.js is a 727KB obfuscated payload, unrelated to an ESLint config.
- math_init.js dynamically fetches content and evals a response body.
- math_init.js includes credential-oriented GitHub token handling.
Evidence against
- index.js and plugins/formatjs.js are ordinary ESLint configuration exports.
- The only clear setup.mjs endpoint is a legitimate Bun release host, but it is used to run the hidden payload.
Behavioral surface
ChildProcessEvalFilesystemNetworkShell
HighEntropyStringsMinifiedUrlStrings
Source & flagged code
3 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
2 High2 Medium5 Low
HighInstall Time Lifecycle Scriptspackage.json
HighKnown Malware Source Similaritysetup.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-formatjs@24.0.5.
The versions list below shows the verdict for each recorded version.
- Avoid installing @ornikar/eslint-config-formatjs@24.0.5. 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: .
Source advisory published: .
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