Which versions of devplatform-prettier-config are malicious?

The following npm versions of devplatform-prettier-config are flagged malicious: 35.1.3. Treat any of these as compromised.

How do I remediate devplatform-prettier-config if I installed it?

Remove devplatform-prettier-config 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.

I already installed devplatform-prettier-config — how do I know if it already compromised me?

If devplatform-prettier-config 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.

Is devplatform-prettier-config part of a known attack campaign?

Yes — devplatform-prettier-config is associated with the IN-MAL-2026-015035 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-prettier-config across my projects, lockfiles, and CI pipelines?

Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for devplatform-prettier-config (version 35.1.3). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging devplatform-prettier-config across your stack and pipelines.

Malicious package

devplatform-prettier-confignpm

devplatform-prettier-config is a confirmed malicious npm package (MAL-2026-12734) that executes malicious code on install (malicious version 35.1.3). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in devplatform-prettier-config (npm)

MAL-2026-12734

Immediate action

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

npm uninstall devplatform-prettier-config

What this malware does

Package presents itself as a prettier configuration/settings manager. index.js requires compat.js at module load, which downloads a platform-specific binary from obfuscated Cloudflare Workers subdomains (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev) assembled at runtime from string-split arrays via.join(''). If the HTTPS fetch fails, it falls back to a covert DNS TXT-record channel under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru (c.<domain> for chunk count, i.<domain> for base64-chunked payload), reassembles and executes the payload. The fetched bytes are written to /var/tmp/.cache<rand> on Linux or TEMP\dotnet_diag_<rand>.exe on Windows using deceptive filenames, chmod 0755, then spawned detached via spawn("/bin/sh", ["-c",...]) or spawn("cmd",...). No hash or signature verification. A lock-file at /tmp/.analytics_state is used to suppress repeated runs. Destinations are unrelated to any prettier or JavaScript-tooling publisher.

Malicious versions

1 flagged

35.1.3

Indicators of compromise (SHA-256)

db5580fbae2ba8f21820a5ba50d8e632cfc12192c3f7cbaeccc8065b4cb5c57d

Detection & response playbook

Malicious package

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for devplatform-prettier-config (version 35.1.3). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging devplatform-prettier-config across your stack and pipelines.
If you installed it — respond
Remove devplatform-prettier-config 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-prettier-config 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-prettier-config 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

No. devplatform-prettier-config on npm has been identified as a malicious package (version 35.1.3 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015035

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks devplatform-prettier-config-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.

Malware detection Runtime egress monitoring

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