registry / Credential exfiltration / editable-contracts
editable-contracts
JSON driven editable contracts
This report shows the evidence for editable-contracts@0.0.16. 16 of 16 known versions are blocked or flagged. The newest version, 0.0.27, is blocked. See all versions.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiThe preinstall chain executes a concealed payload rather than package functionality, with remote eval and token handling. 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 preinstall
Impact
Arbitrary code execution and credential exfiltration during installation.
Mechanism
downloaded runtime executes obfuscated credential-harvesting remote-code loader
Attack narrative
Installing the package invokes setup.mjs. It obtains or uses Bun to execute the unrelated, heavily obfuscated math_init.js payload. That payload contains fetched-content eval, token-related handling, and child-process execution, creating an install-time remote-code and credential-theft chain unrelated to the declared library.
AI rationale
The preinstall chain executes a concealed payload rather than package functionality, with remote eval and token handling. This is concrete malicious install-time behavior.
Evidence
package.jsonsetup.mjsmath_init.jsdist/editable-contracts.jssrc/editable-contracts.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` during preinstall.
- setup.mjs downloads Bun, then executes `math_init.js` at install time.
- math_init.js is a 728 KB obfuscated payload containing remote-content `eval`.
- math_init.js contains npm/GitHub token-handling paths and child-process use.
Evidence against
- dist/editable-contracts.js and src/editable-contracts.ts implement the stated MobX editor library.
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 = @servicetitan/anvil2@3.9.2
matchedPath = setup.mjs
matchedIdentity = npm:QHNlcnZpY2V0aXRhbi9hbnZpbDI:3.9.2
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 editable-contracts@0.0.16.
The versions list below shows the verdict for each recorded version.
- Avoid installing editable-contracts@0.0.16. 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: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.
Versions
16 known versions0.0.27latestMaliciousMalwareBlockPublishedAug 4, 2026, 12:04 PM0.0.26MaliciousMalwareBlockPublishedAug 4, 2026, 11:50 AM0.0.25MaliciousMalwareBlockPublishedAug 4, 2026, 11:35 AM0.0.24MaliciousMalwareBlockPublishedAug 4, 2026, 11:32 AM0.0.23MaliciousMalwareBlockPublishedAug 4, 2026, 11:29 AM0.0.22MaliciousMalwareBlockPublishedAug 4, 2026, 11:21 AM0.0.21MaliciousMalwareBlockPublishedAug 4, 2026, 11:18 AM0.0.20MaliciousMalwareBlockPublishedAug 4, 2026, 11:15 AM0.0.19MaliciousMalwareBlockPublishedAug 4, 2026, 11:08 AM0.0.18MaliciousMalwareBlockPublishedAug 4, 2026, 11:02 AM0.0.17MaliciousMalwareBlockPublishedAug 4, 2026, 10:58 AM0.0.16shownMaliciousCredential ExfiltrationBlockPublishedAug 4, 2026, 10:53 AM0.0.15MaliciousMalwareBlockPublishedAug 4, 2026, 10:49 AM0.0.14MaliciousMalwareBlockPublishedAug 4, 2026, 10:45 AM0.0.13MaliciousMalwareBlockPublishedAug 4, 2026, 10:42 AM0.0.12MaliciousMalwareBlockPublishedAug 4, 2026, 10:41 AM