devplatform-spa-plugin-thermostatnpm
Advisory published Updated
devplatform-spa-plugin-thermostat is a confirmed malicious npm package (MAL-2026-12782) that executes malicious code on install (malicious version 35.9.9). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in devplatform-spa-plugin-thermostat (npm)
What this malware does
On require, index.js loads compat.js which selects a per-platform payload path, downloads a binary over HTTPS from rotating Cloudflare Workers subdomains under oob-worker.cfNNN-XXX.workers.dev (host strings reassembled from split arrays such as ["oob-worker.cf100-416.","work","er","s.","dev"].join("")) with a DNS-TXT base64-chunk fallback under *.dl.wel1.ru, writes it to /var/tmp or %TEMP% under masquerading names (dotnet_diag<rand>.exe,.cache_<rand>,.analytics_state), chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe. No hash or signature verification is performed. Additional obfuscation reconstructs the child_process require via 'child_' + 'process' concatenation. The package is published as a 'thermostat SPA plugin' but the fetched binary and infrastructure have no relation to that stated purpose.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for devplatform-spa-plugin-thermostat (version 35.9.9).
If you installed it — respond
Remove devplatform-spa-plugin-thermostat 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-thermostat 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-thermostat-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.