devplatform-spa-errorsnpm
Advisory published Updated
devplatform-spa-errors is a confirmed malicious npm package (MAL-2026-13545) that executes malicious code on install (malicious version 35.5.7). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in devplatform-spa-errors (npm)
What this malware does
On require() of the package, index.js unconditionally loads loader.js, which selects a platform-specific payload path, fetches an opaque native binary from string-concatenated Cloudflare Workers subdomains (oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-TXT chunked fallback channel to *.dl.wel1.ru, writes the bytes to a temp path disguised as dotnet_diag<tok>.exe on Windows or.cache_<tok> on POSIX, chmods it to 0755, and spawns it detached via /bin/sh -c "<path> &" or cmd.exe /c start. Hostnames and dropped filenames are assembled at runtime from split-string arrays and framed with Analytics/telemetry SDK cover strings. lib/telemetry.js contains a duplicate copy of the dropper logic (base64-decoded chunks, chmodSync 0755, cp.spawn('/bin/sh', ['-c', filePath + ' &'])) inside a decoy Sentry-like observability module. The package delivers attacker-controlled native code to the installer's host on module load, with no integrity verification and active string obfuscation to evade review.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for devplatform-spa-errors (version 35.5.7).
If you installed it — respond
Remove devplatform-spa-errors 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-errors 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-errors-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.