@coopeuch/core@1.999.999
Core utilities and shared module configuration.
AI Security Review
scanned 12d ago · by lpm-firewall-aiThe automatic install hook transmits host and consumer-project identifying information to an external collector. This is a concrete data-exfiltration behavior, regardless of the source comments describing it as a proof of concept.
Static reason
One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review; source fingerprint signature matched known malicious package; routed for review
Trigger
Package installation invokes the postinstall hook.
Impact
An external operator can learn which environments installed the package and correlate host and project identity details.
Mechanism
The hook builds a report from host, user, network, runtime, npm, and consumer-project data, posts it to the collector, and performs a package-labeled DNS lookup.
Attack narrative
On installation, package.json runs postinstall.js. That hook assembles a report containing host and username, network interfaces, npm configuration values, consumer manifest identity, and runtime details. It sends the report by HTTPS to collector.oob.s4yhii.com and also performs a package-labeled DNS lookup. The resulting disclosure occurs automatically during installation.
AI rationale
The automatic install hook transmits host and consumer-project identifying information to an external collector. This is a concrete data-exfiltration behavior, regardless of the source comments describing it as a proof of concept.
Evidence
package.jsonpostinstall.js
Network endpoints2
collector.oob.s4yhii.comdb03o8lag74hsugsg2j091t8mfcf437h3.oob.s4yhii.com
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- The package runs postinstall.js automatically during installation.
- The hook gathers host, user, network, consumer-project, and runtime identity details into a report.
- The hook sends that report to an external collector and makes a package-labeled DNS lookup.
Evidence against
- The code labels the behavior a proof of concept and describes limits on collected data, but it still transmits identifying host and project details.
Behavioral surface
EnvironmentVarsFilesystemNetwork
Source & flagged code
8 flagged · loading sourcepackage.jsonView file
•scripts.postinstall = node ./postinstall.js
High
Install Time Lifecycle Scripts
Package defines install-time lifecycle scripts.
package.jsonView on unpkg11"postinstall": "node ./postinstall.js"
},
"files": [
"README.md",
"D
High
Suspicious Lifecycle Evidence
The package runs postinstall.js automatically during installation.
package.jsonView on unpkg · L11•scripts.postinstall = node ./postinstall.js
Medium
Ambiguous Install Lifecycle Script
Install-time lifecycle script is not statically allowlisted and needs review.
package.jsonView on unpkgpostinstall.jsView file
Findings
7 High3 Medium2 Low
HighInstall Time Lifecycle Scriptspackage.json
HighHost Fingerprint Exfiltrationpostinstall.js
HighKnown Malware Source Similaritypostinstall.js
HighKnown Malware Source Fingerprint Signaturepostinstall.js
HighSuspicious Lifecycle Evidencepackage.json
HighAi Review Evidencepostinstall.js
HighAi Review Evidencepostinstall.js
MediumAmbiguous Install Lifecycle Scriptpackage.json
MediumNetwork
MediumEnvironment Vars
LowScripts Present
LowFilesystem
Affected versions and remediation
This report applies to @coopeuch/core@1.999.999.
See all versions of @coopeuch/core for other recorded verdicts.
- Avoid installing @coopeuch/core@1.999.999. 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.