MalwarePublished 5 Aug 2026

claims-payout-offer-domain (npm) · Malicious Code

Affects claims-payout-offer-domainSource GCVE Database

Malicious package : remove claims-payout-offer-domain and rotate any secrets on hosts that installed it.

Data as of 5 Aug 2026, 16:15 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-12634

What to do

Remove claims-payout-offer-domain from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Affected software

Product	Affected	Fixed in
npmclaims-payout-offer-domain	Affected =35.6.1	Fixed in–

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Description

The npm package 'claims-payout-offer-domain' version 35.6.1 contains malicious code that, upon being required, downloads and executes an opaque binary payload from obfuscated external sources. The payload is fetched without integrity verification and executed with elevated permissions, potentially compromising the host system.

Impact

This behavior allows arbitrary code execution on the host system with the permissions of the user running the Node.js process. The lack of integrity checks and the use of obfuscated, external payload delivery mechanisms increase the risk of persistent and stealthy compromise. This could lead to system takeover, data theft, or further malware deployment.

Defensive guidance

Users should immediately cease using 'claims-payout-offer-domain' version 35.6.1 and remove it from their environments. Avoid installing or requiring this package until a trusted, verified version is released. Monitor for any unexpected processes or binaries matching the described behavior. Check vendor advisories or trusted security sources for updates on remediation.

Summary

The 'claims-payout-offer-domain' npm package (version 35.6.1) includes a malicious component in its index.js that unconditionally loads a _vendor.js script. This script dynamically constructs URLs to Cloudflare Workers hosts to fetch an OS/architecture-specific binary payload over HTTPS. If the primary method fails, a DNS-TXT covert channel fallback retrieves base64-encoded payload chunks from subdomains of dl.wel1.ru. The binary is saved to temporary directories under disguised filenames, made executable, and then executed detached via shell commands. There is no pinning, hash verification, or signature validation of the downloaded payload, and the payload sources are not affiliated with the package publisher, indicating a supply chain compromise or malicious package design.

References

npmjs.com/package/claims-payout-offer-domain/v/35.6.1 (opens in a new tab)

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What to do

Affected software

Description

AI analysisMachine-generated, updated 5 Aug 2026, 16:15 UTC

Technical details

References

Community reviews