Which versions of devplatform-cli-spa are malicious?

The following npm versions of devplatform-cli-spa are flagged malicious: 35.7.8. Treat any of these as compromised.

How do I remediate devplatform-cli-spa if I installed it?

devplatform-cli-spa establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.

I already installed devplatform-cli-spa — how do I know if it already compromised me?

If devplatform-cli-spa 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.

Is devplatform-cli-spa part of a known attack campaign?

Yes — devplatform-cli-spa is associated with the IN-MAL-2026-015070 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find devplatform-cli-spa across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for devplatform-cli-spa (version 35.7.8).

Malicious package

devplatform-cli-spanpm

Advisory published Aug 5, 2026Updated Aug 5, 2026

devplatform-cli-spa is a confirmed malicious npm package (MAL-2026-12704) that opens a backdoor for remote access (malicious version 35.7.8). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in devplatform-cli-spa (npm)

MAL-2026-12704

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall devplatform-cli-spa

What this malware does

On require('devplatform-cli-spa'), index.js loads support.js which selects a payload by OS and architecture, downloads a native binary over HTTPS from string-obfuscated Cloudflare Workers hostnames (oob-worker.cf1-01-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS TXT base64 fallback served from *.dl.wel1.ru. The fetched bytes are written to /tmp/.cache<rnd> on Unix or %TEMP%/dotnet_diag_<rnd>.exe on Windows, chmod'd to 0755, and executed detached via spawn('/bin/sh', ['-c',...]) or spawn('cmd', ['/c', 'start',...]). The C2 hostnames and the DNS fallback domains are assembled at runtime by joining split string fragments (_NODES and _DNS_HOSTS arrays) to evade static string matching. The Windows drop path uses a 'dotnet_diag' decoy filename, and a stamp file gates re-runs across installs.

Malicious versions

1 flagged

35.7.8

Indicators of compromise (SHA-256)

1bb41284069ba395bf67ceb847dc579c7a79c753ea89107116e91559ebbece2a

Detection & response playbook

Backdoor / remote access

Find it
Search your lockfiles and build artifacts for devplatform-cli-spa (version 35.7.8).
If you installed it — respond
devplatform-cli-spa establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.
Did it already run?
If devplatform-cli-spa 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

No. devplatform-cli-spa on npm has been identified as a malicious package (version 35.7.8 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015070

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks devplatform-cli-spa-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.

Malware detection Runtime egress monitoring

Explore

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