MalwarePublished 5 Aug 2026

devplatform-spa-plugin-root-sentry (npm) · Malicious Code

Affects devplatform-spa-plugin-root-sentrySource GCVE Database

Malicious package : remove devplatform-spa-plugin-root-sentry and rotate any secrets on hosts that installed it.

Data as of 6 Aug 2026, 18:24 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-12776

What to do

Remove devplatform-spa-plugin-root-sentry 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
npmdevplatform-spa-plugin-root-sentry	Affected =35.4.5	Fixed in–

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Description

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (4a5ac277cf4ba72cf1040b5e06d6875a7228d7ec491d93423198e2b2f92ecb6a) Package presents as a Sentry-related SPA plugin but the exported class is an empty stub; index.js requires _bootstrap.js, which on load selects a platform-specific endpoint, fetches an opaque binary from Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev) with hostnames reconstructed at runtime via array-join to evade literal detection, writes it to /tmp or %TEMP% under disguised names (.cache_<hex>, dotnet_diag_<hex>.exe), chmods 0755, and spawns it detached via /bin/sh or cmd. If HTTPS mirrors fail, a DNS-TXT fallback channel queries c.<domain> at sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru for a chunk count and reassembles base64-encoded payload chunks from N.<domain> TXT records. A second file lib/telemetry.js contains an unreferenced variant of the same dropper. The Cloudflare Workers and wel1.ru destinations are unrelated to any legitimate Sentry infrastructure, and the package's advertised functionality is a cover story around the dropper. ## Source: ghsa-malware (f76cb55af9e854ca5d57e6b318ae84ac06c517b98e7628117cc949f69c5c84fc) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Impact

This package enables execution of arbitrary binary payloads on affected systems, potentially leading to full system compromise or further malicious activity. The use of obfuscated payload delivery and fallback via DNS-TXT records complicates detection and blocking. Since the payload is fetched and executed dynamically, it can be updated or changed by the attacker after installation. The malicious code runs with the permissions of the user installing or running the package, which can lead to privilege escalation or persistence depending on the environment.

Defensive guidance

Users should immediately remove the devplatform-spa-plugin-root-sentry package version 35.4.5 from their environments. Avoid installing or using this package. Monitor for any binaries or processes matching the described behavior (e.g., files named .cache_<hex> or dotnet_diag_<hex>.exe in temporary directories) and terminate or remove them. Since the package uses external infrastructure unrelated to legitimate Sentry services, network-level blocking of the identified Cloudflare Workers domains and wel1.ru DNS queries may help mitigate risk. Check vendor advisories or trusted sources for updates on remediation status.

Summary

The devplatform-spa-plugin-root-sentry npm package version 35.4.5 contains malicious code that acts as a dropper. Upon loading, it dynamically constructs hostnames to fetch an opaque binary payload from Cloudflare Workers domains, writes this payload to temporary filesystem locations under disguised filenames, changes permissions to executable, and launches the payload detached via system shell commands (/bin/sh or cmd). If the HTTPS fetch fails, it falls back to querying DNS-TXT records from domains under wel1.ru to retrieve and reassemble the payload in chunks encoded in base64. The package's purported Sentry SPA plugin functionality is a decoy to hide this behavior. Additionally, a second dropper variant exists in lib/telemetry.js but is not invoked. The domains and infrastructure used for payload delivery are unrelated to any legitimate Sentry infrastructure, indicating malicious intent.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 5 Aug 2026, 16:45 UTC

Technical details

References

Community reviews