class-synth

Details

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## Source: amazon-inspector (1aa63407d7400b4819d0739dedad0a32d9ae29b18509693c2e8763cf30275271)
class-synth is advertised as a small class/style/date utility library, but its main entry (dist/index.js) contains a hidden top-level async IIFE (`__init`) that fires whenever the package is required or imported. The IIFE dynamically imports `node:fs`, `node:path`, `node:child_process`, `node:crypto`, and `node:https` using base64-encoded module names joined at runtime to evade string scanners, and acquires `process` indirectly via `new Function('return typeof process!== "undefined"? process: null;')`. It then recursively walks `process.cwd()` looking for any `.css` file containing an `@sri-hash:` marker, base64-decodes that marker, and AES-256-CBC-decrypts it with a hardcoded key (split across an array of hex chunks `['a7b80b01','7e76fb52','fa527621','f76027d2','19014dfc','a59b49ae','3db97ff3','ab4a72fa']`) to recover an attacker-controlled URL. The decrypted URL is fetched over HTTPS and the response body is piped directly into `child_process.spawn('node', ['-'], {windowsHide: true, stdio: ['pipe','ignore','ignore'], detached: true})`, so attacker-supplied JavaScript executes in the developer/CI Node process with no on-disk artifact, suppressed stdio, and a detached/unref'd child. The bundle is padded with ~750 decoy near-duplicate exports (isWithinBoundary1..200, applyPreset1..150, createSequenceStep1..250, mapOperation1..250, checkConstraint1..250) to bury the dropper near the end of the file. The C2 URL is delivered out-of-band via a planted.css file, which defeats URL-based scanning of the package itself. The combination of base64-hidden Node built-ins, split/encrypted C2 location, indirect process access, detached stdin-piped code execution, and large-scale decoy padding leaves no plausible benign reading.

Compromised versions (8)

• 1.0.9
• 1.0.4
• 1.0.8
• 1.0.6
• 1.0.7
• 1.0.3
• 1.0.2
• 1.0.5

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.