registry / Credential exfiltration / @servicetitan/eslint-plugin-mobx-6
@servicetitan/eslint-plugin-mobx-6
This report shows the evidence for @servicetitan/eslint-plugin-mobx-6@12.8.17. 6 of 6 known versions are blocked or flagged. The newest version, 12.8.20, is blocked. See all versions.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiThe benign lint-rule entrypoint does not justify the preinstall bootstrap or its obfuscated token-oriented payload. This is concrete malicious install-time behavior.
Static reason
One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review
Trigger
npm install, before package use
Impact
Potential GitHub credential theft or misuse during installation.
Mechanism
downloaded runtime bootstrap executes an obfuscated credential-processing payload
Attack narrative
Installing the package triggers setup.mjs. It executes math_init.js through Bun, downloading and executing a Bun binary from GitHub when Bun is absent. math_init.js is a large obfuscated payload that dynamically constructs code and contains filesystem/platform access plus GitHub token processing, behavior unrelated to the package's ESLint rules. This creates an unconsented install-time credential-risk execution chain.
AI rationale
The benign lint-rule entrypoint does not justify the preinstall bootstrap or its obfuscated token-oriented payload. This is concrete malicious install-time behavior.
Evidence
package.jsonsetup.mjsmath_init.jsdist/index.jssrc/index.ts
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, then executes bundled math_init.js.
- math_init.js is a 727KB heavily obfuscated executable payload using dynamic Function.
- Obfuscated payload imports fs/os/path and contains GitHub-token handling (`ghtoken`, `ghs_old`, `ghs_jwt`).
Evidence against
- dist/index.js and src/index.ts contain ordinary ESLint MobX rules.
- No malicious behavior is present in the declared ESLint entrypoint.
Behavioral surface
ChildProcessEvalFilesystemNetworkShell
HighEntropyStringsMinifiedUrlStrings
NoLicense
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 High2 Medium6 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
LowNo License
Affected versions and remediation
This report applies to @servicetitan/eslint-plugin-mobx-6@12.8.17.
The versions list below shows the verdict for each recorded version.
- Avoid installing @servicetitan/eslint-plugin-mobx-6@12.8.17. 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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