devplatform-spa-plugin-root-sentrynpm
devplatform-spa-plugin-root-sentry is a confirmed malicious npm package (MAL-2026-12776) that executes malicious code on install (malicious version 35.4.5). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in devplatform-spa-plugin-root-sentry (npm)
What this malware does
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.
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.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for devplatform-spa-plugin-root-sentry (version 35.4.5). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging devplatform-spa-plugin-root-sentry across your stack and pipelines.
If you installed it — respond
Remove devplatform-spa-plugin-root-sentry from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If devplatform-spa-plugin-root-sentry was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks devplatform-spa-plugin-root-sentry before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks devplatform-spa-plugin-root-sentry-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.