What does the devplatform-cli-contracts malware do?

On require() of the package, index.js loads _compat.js which reconstructs destination hostnames from split string arrays (e.g. ["oob-worker.cf100-416.worker","s.","dev"].join("") and DNS-TXT fallbacks assembled from ['sd','k.dl.wel1.','ru']), fetches a platform-specific binary via HTTPS, writes it to /tmp or %TEMP% under decoy names such as dotnet_diag_ .exe and.cache_ , chmods 0755, and spawns it detached via cp.spawn("/bin/sh",["-c", fp+" &"],{detached:true}).unref(). A cooldown marker (.analytics_state) suppresses repeat execution. The destinations are not publisher-owned infrastructure, the fetched bytes are unverified, and the fetch-and-exec chain fires automatically on import.

Which versions of devplatform-cli-contracts are malicious?

The following npm versions of devplatform-cli-contracts are flagged malicious: 35.7.3. Treat any of these as compromised.

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

Remove devplatform-cli-contracts 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-cli-contracts — how do I know if it already compromised me?

If devplatform-cli-contracts 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-contracts part of a known attack campaign?

Yes — devplatform-cli-contracts is associated with the IN-MAL-2026-015072 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-contracts across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for devplatform-cli-contracts (version 35.7.3).

Malicious package

devplatform-cli-contractsnpm

Advisory published Aug 5, 2026Updated Aug 5, 2026

devplatform-cli-contracts is a confirmed malicious npm package (MAL-2026-12700) that executes malicious code on install (malicious version 35.7.3). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in devplatform-cli-contracts (npm)

MAL-2026-12700

Immediate action

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

npm uninstall devplatform-cli-contracts

What this malware does

On require() of the package, index.js loads compat.js which reconstructs destination hostnames from split string arrays (e.g. ["oob-worker.cf100-416.worker","s.","dev"].join("") and DNS-TXT fallbacks assembled from ['sd','k.dl.wel1.','ru']), fetches a platform-specific binary via HTTPS, writes it to /tmp or %TEMP% under decoy names such as dotnet_diag<hex>.exe and.cache_<hex>, chmods 0755, and spawns it detached via cp.spawn("/bin/sh",["-c", fp+" &"],{detached:true}).unref(). A cooldown marker (.analytics_state) suppresses repeat execution. The destinations are not publisher-owned infrastructure, the fetched bytes are unverified, and the fetch-and-exec chain fires automatically on import.

Malicious versions

1 flagged

35.7.3

Indicators of compromise (SHA-256)

6bc9fcdf16d7e6c67e3dbc20a6e8bdec551687bc20fffa3c434a35ca387ffade

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for devplatform-cli-contracts (version 35.7.3).
If you installed it — respond
Remove devplatform-cli-contracts 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-cli-contracts 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-contracts on npm has been identified as a malicious package (version 35.7.3 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015072

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks devplatform-cli-contracts-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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