registry / Credential exfiltration / @arv-bedrock/auth-sso
@arv-bedrock/auth-sso
This report shows the evidence for @arv-bedrock/auth-sso@1.6.1, the only known version.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiThe preinstall hook deliberately bootstraps and executes a large obfuscated payload with credential-token handling and remote evaluated code. This is concrete malicious install-time behavior, not required by the package’s documented browser auth functionality.
Static reason
One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review
Trigger
npm preinstall
Impact
Compromise of developer credentials and arbitrary code execution during dependency installation.
Mechanism
remote runtime bootstrap, credential collection, and evaluated payload execution
Attack narrative
Installing the package runs setup.mjs, which downloads or uses Bun and executes the obfuscated math_init.js payload. That payload includes GitHub-token-oriented handling, process execution, network fetches, and eval of fetched content, creating an install-time credential theft and remote-code-execution chain unrelated to the advertised auth client.
AI rationale
The preinstall hook deliberately bootstraps and executes a large obfuscated payload with credential-token handling and remote evaluated code. This is concrete malicious install-time behavior, not required by the package’s documented browser auth functionality.
Evidence
package.jsonsetup.mjsmath_init.jsdist/cjs/auth.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 setup.mjs during preinstall.
- setup.mjs downloads Bun from GitHub and executes math_init.js at install time.
- math_init.js is a 727KB obfuscated payload unrelated to the auth library.
- math_init.js contains credential-token handling (ghtoken/ghs_jwt) and child_process use.
- math_init.js fetches data and passes returned content to eval().
Evidence against
- dist/cjs contains a conventional browser-side Bedrock authentication client.
- README.md describes the published auth API, but not the install 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
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 {
High
Entrypoint Build Divergence
Manifest entrypoint contains risky behavior absent from dist/build output.
setup.mjsView on unpkg · L1•matchType = normalized_sha256
matchedPackage = @ornikar/repo-config-react-legacy-css@15.1.8
matchedPath = setup.mjs
matchedIdentity = npm:[redacted]:15.1.8
similarity = 1.000
summary = normalized source hash matched finalized malicious source
High
Known Malware Source Similarity
Source file is highly similar to a previously finalized malicious package; route for source-aware review.
setup.mjsView on unpkgFindings
3 High2 Medium5 Low
HighInstall Time Lifecycle Scriptspackage.json
HighEntrypoint Build Divergencesetup.mjs
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 @arv-bedrock/auth-sso@1.6.1.
The versions list below shows the verdict for each recorded version.
- Avoid installing @arv-bedrock/auth-sso@1.6.1. 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: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.