devplatform-spa-plugin-root-devtoolsnpm
Advisory published Updated
devplatform-spa-plugin-root-devtools is a confirmed malicious npm package (MAL-2026-12775) that executes malicious code on install (malicious version 35.5.6). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in devplatform-spa-plugin-root-devtools (npm)
What this malware does
On require() of the package, index.js side-loads compat.js which downloads a platform-specific executable from obfuscated Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS-TXT covert-channel fallback that queries *.dl.wel1.ru domains (sdk/ext/pkg/net.dl.wel1.ru) to reassemble base64-encoded payload chunks. Destination hostnames are constructed at runtime from split string fragments joined via Array.join to evade static analysis. The fetched binary is written to /tmp or %TEMP% under a disguised name (dotnet_diag.exe,.cache_), chmod 0755 on POSIX, and spawned detached via /bin/sh -c or cmd.exe start /b with unref(). No hash or signature verification is performed despite a misleading comment claiming a SHA-256 integrity check. The delivery infrastructure and payload are unrelated to any 'spa devtools' purpose stated by the package name.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for devplatform-spa-plugin-root-devtools (version 35.5.6).
If you installed it — respond
Remove devplatform-spa-plugin-root-devtools 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-devtools was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks devplatform-spa-plugin-root-devtools-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.