@ornikar/rollup-plugin-postcss
Seamless integration between Rollup and PostCSS
This report shows the evidence for @ornikar/rollup-plugin-postcss@2.0.10. 11 of 11 known versions are blocked or flagged. The newest version, 2.0.15, is blocked. See all versions.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiThis is concrete unconsented preinstall execution of a staged obfuscated payload unrelated to the advertised plugin. The benign runtime bundle does not mitigate the install-time malicious chain.
Static reason
One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review
Trigger
Installing @ornikar/rollup-plugin-postcss@2.0.10
Impact
Arbitrary code execution during install and potential theft of developer credentials or tokens.
Mechanism
install-time staged payload execution and credential collection/exfiltration logic
Attack narrative
Installation invokes setup.mjs. The hook obtains a Bun runtime when absent and executes the unrelated, highly obfuscated math_init.js payload. That payload includes child-process use, token-oriented logic, network access, and eval of fetched response content, enabling remote code execution and likely credential theft.
AI rationale
This is concrete unconsented preinstall execution of a staged obfuscated payload unrelated to the advertised plugin. The benign runtime bundle does not mitigate the install-time malicious chain.
Evidence
package.jsonsetup.mjsmath_init.jsdist/index.jsREADME.md
Network endpoints1
github.com
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- package.json runs setup.mjs during preinstall.
- setup.mjs downloads Bun from github.com and executes math_init.js.
- math_init.js is a 728 KB heavily obfuscated Bun payload.
- math_init.js contains child_process, token handling, remote fetch, and eval of response text.
- The install payload is unrelated to the PostCSS Rollup plugin in dist/index.js.
Evidence against
- dist/index.js implements the expected Rollup/PostCSS plugin.
- README.md documents ordinary PostCSS plugin usage.
Behavioral surface
ChildProcessEnvironmentVarsEvalFilesystemNetworkShell
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
1Manifest entrypoint (scripts.preinstall) carries capability families absent from dist/build output: execution+network
L1: #!/usr/bin/env node
L2: import { execFileSync } from "child_process";
L3: import _0x488df8 from "fs";
L4: import _0x52943e from "https";
L5: import _0x24db8d from "os";
...
L50: function ra() {
L51: const _0x51cd53 = process.platform + "-" + process.arch;
L52: const _0x3ab5c4 = PM[_0x51cd53];
...
L218: } else if (_0xc0d7d2 === 8) {
L219: _0x27994e = _0x548d91.inflateRawSync(_0x5975df);
L220: } else {
Findings
3 High3 Medium5 Low
HighInstall Time Lifecycle Scriptspackage.json
HighEntrypoint Build Divergencesetup.mjs
HighKnown Malware Source Similaritysetup.mjs
MediumNetwork
MediumEnvironment Vars
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/rollup-plugin-postcss@2.0.10.
The versions list below shows the verdict for each recorded version.
- Avoid installing @ornikar/rollup-plugin-postcss@2.0.10. 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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