registry / Remote code execution / @ornikar/postcss-config
@ornikar/postcss-config
🎨 postcss config files
This report shows the evidence for @ornikar/postcss-config@9.1.7. 5 of 5 known versions are blocked or flagged. See all versions.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiSource inspection confirms an install-triggered downloader/executor chain leading to an obfuscated remote-eval payload. This is concrete malicious behavior, not a noisy static signal.
Static reason
One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review
Trigger
Installing @ornikar/postcss-config@9.1.7
Impact
Arbitrary code execution and likely credential theft on the install host.
Mechanism
preinstall downloader executes obfuscated payload with remote eval
Attack narrative
The preinstall hook invokes setup.mjs, which obtains a Bun binary, then executes math_init.js. The bundled payload is heavily obfuscated and contains an eval of fetched response text, subprocess/filesystem behavior, and GitHub-token-oriented logic. This creates unconsented install-time remote code execution unrelated to the package's advertised PostCSS configuration.
AI rationale
Source inspection confirms an install-triggered downloader/executor chain leading to an obfuscated remote-eval payload. This is concrete malicious behavior, not a noisy static signal.
Evidence
package.jsonsetup.mjsmath_init.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` as preinstall.
- setup.mjs downloads Bun from github.com and executes math_init.js during install.
- math_init.js is a 728KB obfuscated payload, not PostCSS configuration.
- math_init.js fetches response text and passes it to eval.
- math_init.js contains GitHub-token handling and child-process/file operations.
Evidence against
- index.js is a small normal PostCSS plugin config.
- No legitimate package functionality requires a Bun bootstrapper or opaque 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/postcss-config@9.1.7.
The versions list below shows the verdict for each recorded version.
- Avoid installing @ornikar/postcss-config@9.1.7. 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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